// Copyright 2015 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.rules.config;

import static com.google.common.truth.Truth.assertThat;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.analysis.ConfiguredRuleClassProvider;
import com.google.devtools.build.lib.analysis.config.BuildOptions;
import com.google.devtools.build.lib.analysis.config.ConfigMatchingProvider;
import com.google.devtools.build.lib.analysis.config.Fragment;
import com.google.devtools.build.lib.analysis.config.FragmentOptions;
import com.google.devtools.build.lib.analysis.config.RequiresOptions;
import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.RepositoryName;
import com.google.devtools.build.lib.packages.BuildType;
import com.google.devtools.build.lib.packages.License.LicenseType;
import com.google.devtools.build.lib.packages.RawAttributeMapper;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.testutil.TestConstants;
import com.google.devtools.build.lib.testutil.TestRuleClassProvider;
import com.google.devtools.common.options.Option;
import com.google.devtools.common.options.OptionDefinition;
import com.google.devtools.common.options.OptionDocumentationCategory;
import com.google.devtools.common.options.OptionEffectTag;
import com.google.devtools.common.options.OptionMetadataTag;
import com.google.devtools.common.options.OptionsParser;
import java.util.Map;
import java.util.Set;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Tests for {@link ConfigSetting}.
 */
@RunWith(JUnit4.class)
public class ConfigSettingTest extends BuildViewTestCase {

  /** Extra options for this test. */
  public static class DummyTestOptions extends FragmentOptions {
    public DummyTestOptions() {}

    @Option(
        name = "internal_option",
        documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
        effectTags = {OptionEffectTag.NO_OP},
        defaultValue = "super secret",
        metadataTags = {OptionMetadataTag.INTERNAL})
    public String internalOption;

    @Option(
        name = "nonselectable_option",
        documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
        effectTags = {OptionEffectTag.NO_OP},
        defaultValue = "true")
    public boolean nonselectableOption;

    private static final OptionDefinition NONSELECTABLE_OPTION_DEFINITION =
        OptionsParser.getOptionDefinitionByName(DummyTestOptions.class, "nonselectable_option");

    @Option(
        name = "nonselectable_allowlisted_option",
        documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
        effectTags = {OptionEffectTag.NO_OP},
        defaultValue = "true")
    public boolean nonselectableAllowlistedOption;

    private static final OptionDefinition NONSELECTABLE_ALLOWLISTED_OPTION_DEFINITION =
        OptionsParser.getOptionDefinitionByName(
            DummyTestOptions.class, "nonselectable_allowlisted_option");

    @Option(
        name = "nonselectable_custom_message_option",
        documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
        effectTags = {OptionEffectTag.NO_OP},
        defaultValue = "true")
    public boolean nonselectableCustomMessageOption;

    private static final OptionDefinition NONSELECTABLE_CUSTOM_MESSAGE_OPTION_DEFINITION =
        OptionsParser.getOptionDefinitionByName(
            DummyTestOptions.class, "nonselectable_custom_message_option");

    @Override
    public Map<OptionDefinition, SelectRestriction> getSelectRestrictions() {
      return ImmutableMap.of(
          NONSELECTABLE_OPTION_DEFINITION,
          new SelectRestriction(/*visibleWithinToolsPackage=*/ false, /*errorMessage=*/ null),
          NONSELECTABLE_ALLOWLISTED_OPTION_DEFINITION,
          new SelectRestriction(/*visibleWithinToolsPackage=*/ true, /*errorMessage=*/ null),
          NONSELECTABLE_CUSTOM_MESSAGE_OPTION_DEFINITION,
          new SelectRestriction(
              /*visibleWithinToolsPackage=*/ false,
              /*errorMessage=*/ "For very important reasons."));
    }
  }

  /** Test fragment. */
  @RequiresOptions(options = {DummyTestOptions.class})
  public static final class DummyTestOptionsFragment extends Fragment {
    private final BuildOptions buildOptions;

    public DummyTestOptionsFragment(BuildOptions buildOptions) {
      this.buildOptions = buildOptions;
    }
    // Getter required to satisfy AutoCodec.
    public BuildOptions getBuildOptions() {
      return buildOptions;
    }
  }

  @Override
  protected ConfiguredRuleClassProvider createRuleClassProvider() {
    ConfiguredRuleClassProvider.Builder builder = new ConfiguredRuleClassProvider.Builder();
    TestRuleClassProvider.addStandardRules(builder);
    builder.addRuleDefinition(new FeatureFlagSetterRule());
    builder.addConfigurationFragment(DummyTestOptionsFragment.class);
    return builder.build();
  }

  private void writeSimpleExample() throws Exception {
    scratch.file("pkg/BUILD",
        "config_setting(",
        "    name = 'foo',",
        "    values = {",
        "        'compilation_mode': 'dbg',",
        "        'stamp': '1',",
        "    })");
  }

  private ConfigMatchingProvider getConfigMatchingProvider(String label) throws Exception {
    return getConfiguredTarget(label).getProvider(ConfigMatchingProvider.class);
  }

  private boolean forceConvertMatchResult(ConfigMatchingProvider.MatchResult result)
      throws Exception {
    if (result.equals(ConfigMatchingProvider.MatchResult.MATCH)) {
      return true;
    } else if (result.equals(ConfigMatchingProvider.MatchResult.NOMATCH)) {
      return false;
    }
    throw new IllegalStateException("Unexpected MatchResult: " + result);
  }

  private boolean getConfigMatchingProviderResultAsBoolean(String label) throws Exception {
    return forceConvertMatchResult(getConfigMatchingProvider(label).result());
  }

  /** Checks the behavior of {@link ConfigSetting#isUnderToolsPackage}. */
  @Test
  public void isUnderToolsPackage() throws Exception {
    RepositoryName toolsRepo = RepositoryName.create("tools");
    // Subpackage of the tools package.
    assertThat(
            ConfigSetting.isUnderToolsPackage(
                Label.parseCanonicalUnchecked("@tools//tools/subpkg:foo"), toolsRepo))
        .isTrue();
    // The tools package itself.
    assertThat(
            ConfigSetting.isUnderToolsPackage(
                Label.parseCanonicalUnchecked("@tools//tools:foo"), toolsRepo))
        .isTrue();
    // The tools repo, but wrong package.
    assertThat(
            ConfigSetting.isUnderToolsPackage(
                Label.parseCanonicalUnchecked("@tools//nottools:foo"), toolsRepo))
        .isFalse();
    // Not even the tools repo.
    assertThat(
            ConfigSetting.isUnderToolsPackage(
                Label.parseCanonicalUnchecked("@nottools//nottools:foo"), toolsRepo))
        .isFalse();
    // A tools package but in the wrong repo.
    assertThat(
            ConfigSetting.isUnderToolsPackage(
                Label.parseCanonicalUnchecked("@nottools//tools:foo"), toolsRepo))
        .isFalse();
  }

  /**
   * Tests that a config_setting only matches build configurations where *all* of
   * its flag specifications match.
   */
  @Test
  public void matchingCriteria() throws Exception {
    writeSimpleExample();

    // First flag mismatches:
    useConfiguration("-c", "opt", "--stamp");
    assertThat(getConfigMatchingProviderResultAsBoolean("//pkg:foo")).isFalse();

    // Second flag mismatches:
    useConfiguration("-c", "dbg", "--nostamp");
    assertThat(getConfigMatchingProviderResultAsBoolean("//pkg:foo")).isFalse();

    // Both flags mismatch:
    useConfiguration("-c", "opt", "--nostamp");
    assertThat(getConfigMatchingProviderResultAsBoolean("//pkg:foo")).isFalse();

    // Both flags match:
    useConfiguration("-c", "dbg", "--stamp");
    assertThat(getConfigMatchingProviderResultAsBoolean("//pkg:foo")).isTrue();
  }

  /**
   * Tests that {@link ConfigMatchingProvider#label} is correct.
   */
  @Test
  public void labelGetter() throws Exception {
    writeSimpleExample();
    assertThat(getConfigMatchingProvider("//pkg:foo").label())
        .isEqualTo(Label.parseCanonical("//pkg:foo"));
  }

  /**
   * Tests that rule analysis fails on unknown options.
   */
  @Test
  public void unknownOption() throws Exception {
    checkError("foo", "badoption",
        "unknown option: 'not_an_option'",
        "config_setting(",
        "    name = 'badoption',",
        "    values = {'not_an_option': 'bar'})");
  }

  /**
   * Tests that rule analysis fails on internal options.
   */
  @Test
  public void internalOption() throws Exception {
    checkError("foo", "badoption",
        "unknown option: 'internal_option'",
        "config_setting(",
        "    name = 'badoption',",
        "    values = {'internal_option': 'bar'})");
  }

  /**
   * Tests that rule analysis fails on invalid option values.
   */
  @Test
  public void invalidOptionValue() throws Exception {
    checkError("foo", "badvalue",
        "Not a valid compilation mode: 'baz'",
        "config_setting(",
        "    name = 'badvalue',",
        "    values = {'compilation_mode': 'baz'})");
  }

  /**
   * Tests that when the first option is valid but the config_setting doesn't match,
   * remaining options are still validity-checked.
   */
  @Test
  public void invalidOptionFartherDown() throws Exception {
    checkError("foo", "badoption",
        "unknown option: 'not_an_option'",
        "config_setting(",
        "    name = 'badoption',",
        "    values = {",
        "        'compilation_mode': 'opt',",
        "        'not_an_option': 'bar',",
        "    })");
  }

  /** Tests that analysis fails on non-selectable options. */
  @Test
  public void nonselectableOption() throws Exception {
    checkError(
        "foo",
        "badoption",
        "option 'nonselectable_option' cannot be used in a config_setting",
        "config_setting(",
        "    name = 'badoption',",
        "    values = {",
        "        'nonselectable_option': 'true',",
        "    },",
        ")");
  }

  /**
   * Tests that allowlisted non-selectable options can't be accessed outside of the tools package.
   */
  @Test
  public void nonselectableAllowlistedOption_OutOfToolsPackage() throws Exception {
    checkError(
        "foo",
        "badoption",
        String.format(
            "option 'nonselectable_allowlisted_option' cannot be used in a config_setting (it is "
                + "allowlisted to %s//tools/... only)",
            TestConstants.TOOLS_REPOSITORY.getCanonicalForm()),
        "config_setting(",
        "    name = 'badoption',",
        "    values = {",
        "        'nonselectable_allowlisted_option': 'true',",
        "    },",
        ")");
  }

  /** Tests that allowlisted non-selectable options can be accessed within the tools package. */
  @Test
  public void nonselectableAllowlistedOption_InToolsPackage() throws Exception {
    scratch.file(
        TestConstants.TOOLS_REPOSITORY_SCRATCH + "tools/pkg/BUILD",
        "config_setting(",
        "    name = 'foo',",
        "    values = {",
        "        'nonselectable_allowlisted_option': 'true',",
        "    })");
    String fooLabel = TestConstants.TOOLS_REPOSITORY + "//tools/pkg:foo";
    assertThat(getConfigMatchingProviderResultAsBoolean(fooLabel)).isTrue();
  }

  /** Tests that custom error messages are displayed for non-selectable options. */
  @Test
  public void nonselectableCustomMessageOption() throws Exception {
    checkError(
        "foo",
        "badoption",
        "option 'nonselectable_custom_message_option' cannot be used in a config_setting. "
            + "For very important reasons.",
        "config_setting(",
        "    name = 'badoption',",
        "    values = {",
        "        'nonselectable_custom_message_option': 'true',",
        "    },",
        ")");
  }

  /** Tests that None is not specifiable for a key's value. */
  @Test
  public void noneValueInSetting() throws Exception {
    checkError(
        "foo",
        "none",
        "ERROR /workspace/foo/BUILD:1:15: //foo:none: "
            + "expected value of type 'string' for dict value element, but got None (NoneType)",
        "config_setting(",
        "    name = 'none',",
        "    values = {\"none_value\": None})");
  }

  /**
   * Tests that *some* settings (values or flag_values) must be specified.
   */
  @Test
  public void emptySettings() throws Exception {
    checkError(
        "foo",
        "empty",
        "in config_setting rule //foo:empty: "
            + "Either values, flag_values or constraint_values must be specified and non-empty",
        "config_setting(",
        "    name = 'empty',",
        "    values = {})");
  }

  /**
   * Tests matching on multi-value attributes with key=value entries (e.g. --define).
   */
  @Test
  public void multiValueDict() throws Exception {
    scratch.file("test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    values = {",
        "        'define': 'foo=bar',",
        "    })");

    useConfiguration("");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "foo=bar");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration("--define", "foo=baz");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "foo=bar", "--define", "bar=baz");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration("--define", "foo=bar", "--define", "bar=baz", "--define", "foo=nope");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "foo=nope", "--define", "bar=baz", "--define", "foo=bar");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  @Test
  public void invalidDefineProducesError() throws Exception {
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    values = {",
        "        'define': 'foo',", // Value should be "foo=<something>".
        "    })");

    checkError(
        "//test:match", "Variable definitions must be in the form of a 'name=value' assignment");
  }

  @Test
  public void multipleDefines() throws Exception {
    scratch.file("test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    define_values = {",
        "        'foo1': 'bar',",
        "        'foo2': 'baz',",
        "    })");

    useConfiguration("");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "foo1=bar");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "foo2=baz");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "foo1=bar", "--define", "foo2=baz");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  /**
   * Tests that for a multi-value dictionary, <code>values = { 'key': 'value' }</code> always refers
   * to a single map entry. Fancy syntax like <code>values = { 'key': 'value=1,key2=value2' }</code>
   * doesn't get around that.
   *
   * <p>This just verifies existing behavior, not explicitly desired behavior. We could enhance
   * options parsing to support multi-value settings if anyone ever wanted that.
   */
  @Test
  public void multiValueDictSettingAlwaysSingleEntry() throws Exception {
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    values = {",
        "        'define': 'foo=bar,baz=bat',",
        "    })");

    useConfiguration("");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "foo=bar");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "foo=bar", "--define", "baz=bat");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "foo=bar,baz=bat");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration("--define", "makethis=a_superset", "--define", "foo=bar,baz=bat");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  @Test
  public void definesCrossAttributes() throws Exception {
    scratch.file("test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    values = {",
        "        'define': 'a=c'",
        "    },",
        "    define_values = {",
        "        'b': 'd',",
        "    })");

    useConfiguration("");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "a=c");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "b=d");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "a=c", "--define", "b=d");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  /**
   * Tests matching on multi-value attributes against single expected values: the actual list must
   * contain the expected value.
   */
  @Test
  public void multiValueListSingleExpectedValue() throws Exception {
    scratch.file("test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    values = {",
        "        'copt': '-Dfoo',",
        "    })");

    useConfiguration("");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--copt", "-Dfoo");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration("--copt", "-Dbar");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--copt", "-Dfoo", "--copt", "-Dbar");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration("--copt", "-Dbar", "--copt", "-Dfoo");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  /**
   * Tests matching on multi-value flags against multiple expected values: the actual list must
   * contain all expected values (and possibly more).
   *
   * <p>This only works for flags that can parse multiple values in the same entry. Not all flags do
   * this: this varies according to each flag's definition. For example "--copt=a,b" produces a
   * single entry ["a,b"], while "--extra_platforms=a,b" produces ["a", "b"].
   */
  @Test
  public void multiValueListMultipleExpectedValues() throws Exception {
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    values = {",
        "        'extra_toolchains': 'one,two',", // This produces ["one", "two"]
        "    })");

    useConfiguration("");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--extra_toolchains", "one");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--extra_toolchains", "two");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--extra_toolchains", "one", "--extra_toolchains", "two");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration("--extra_toolchains", "two", "--extra_toolchains", "one");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration("--extra_toolchains", "one,two");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration("--extra_toolchains", "two,one");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration(
        "--extra_toolchains",
        "ten",
        "--extra_toolchains",
        "two",
        "--extra_toolchains",
        "three",
        "--extra_toolchains",
        "one");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  /**
   * Tests multi-value flags that don't support multiple values <b></b>in the same instance<b>. See
   * comments on {@link #multiValueListMultipleExpectedValues()} for details.
   */
  @Test
  public void multiValueListSingleValueThatLooksLikeMultiple() throws Exception {
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    values = {",
        "        'copt': 'one,two',", // This produces ["one,two"]
        "    })");

    useConfiguration("");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--copt", "one");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--copt", "two");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--copt", "one", "--copt", "two");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--copt", "one,two", "--copt", "one");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration("--copt", "two,one", "--copt", "one");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
  }

  @Test
  public void selectForDefaultCrosstoolTop() throws Exception {
    String crosstoolTop = TestConstants.TOOLS_REPOSITORY + "//tools/cpp:toolchain";
    scratchConfiguredTarget("a", "a",
        "config_setting(name='cs', values={'crosstool_top': '" + crosstoolTop + "'})",
        "sh_library(name='a', srcs=['a.sh'], deps=select({':cs': []}))");
  }

  @Test
  public void selectForDefaultGrteTop() throws Exception {
    scratchConfiguredTarget("a", "a",
        "config_setting(name='cs', values={'grte_top': 'default'})",
        "sh_library(name='a', srcs=['a.sh'], deps=select({':cs': []}))");
  }

  @Test
  public void requiredConfigFragmentMatcher() throws Exception {
    scratch.file("test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    values = {",
        "        'copt': '-Dfoo',",
        "        'javacopt': '-Dbar'",
        "    })");

    Rule target = (Rule) getTarget("//test:match");
    assertThat(target.getRuleClassObject().getOptionReferenceFunction().apply(target))
        .containsExactly("copt", "javacopt");
  }

  @Test
  public void matchesIfFlagValuesAndValuesBothMatch() throws Exception {
    useConfiguration("--copt=-Dright", "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right'],",
        "    default_value = 'right',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  @Test
  public void matchesIfFlagValuesMatchAndValuesAreEmpty() throws Exception {
    useConfiguration("--copt=-Dright", "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "    },",
        "    values = {},",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right'],",
        "    default_value = 'right',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  @Test
  public void matchesIfValuesMatchAndFlagValuesAreEmpty() throws Exception {
    useConfiguration("--copt=-Dright");
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {},",
        "    values = {",
        "        'copt': '-Dright',",
        "    },",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  @Test
  public void doesNotMatchIfNeitherFlagValuesNorValuesMatches() throws Exception {
    useConfiguration("--copt=-Dright", "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':flag': 'wrong',",
        "    },",
        "    values = {",
        "        'copt': '-Dwrong',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
  }

  @Test
  public void doesNotMatchIfFlagValuesDoNotMatchAndValuesAreEmpty() throws Exception {
    useConfiguration("--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':flag': 'wrong',",
        "    },",
        "    values = {},",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
  }

  @Test
  public void doesNotMatchIfFlagValuesDoNotMatchButValuesDo() throws Exception {
    useConfiguration("--copt=-Dright", "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':flag': 'wrong',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
  }

  @Test
  public void doesNotMatchIfValuesDoNotMatchAndFlagValuesAreEmpty() throws Exception {
    useConfiguration("--copt=-Dright");
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {},",
        "    values = {",
        "        'copt': '-Dwrong',",
        "    },",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
  }

  @Test
  public void doesNotMatchIfValuesDoNotMatchButFlagValuesDo() throws Exception {
    useConfiguration("--copt=-Dright", "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "    },",
        "    values = {",
        "        'copt': '-Dwrong',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
  }

  @Test
  public void doesNotMatchIfEvenOneFlagValueDoesNotMatch() throws Exception {
    useConfiguration("--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "        ':flag2': 'bad',",
        "    },",
        "    values = {},",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")",
        "config_feature_flag(",
        "    name = 'flag2',",
        "    allowed_values = ['good', 'bad'],",
        "    default_value = 'good',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
  }

  @Test
  public void matchesIfNonDefaultIsSpecifiedAndFlagValueIsThatValue() throws Exception {
    useConfiguration("--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "feature_flag_setter(",
        "    name = 'setter',",
        "    exports_setting = ':match',",
        "    flag_values = {':flag': 'actual'},",
        "    transitive_configs = [':flag'],",
        ")",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':flag': 'actual',",
        "    },",
        "    values = {},",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['default', 'actual'],",
        "    default_value = 'default',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:setter")).isTrue();
  }

  @Test
  public void doesNotMatchIfDefaultIsSpecifiedAndFlagValueIsNotDefault() throws Exception {
    useConfiguration("--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "feature_flag_setter(",
        "    name = 'setter',",
        "    exports_setting = ':match',",
        "    flag_values = {':flag': 'actual'},",
        "    transitive_configs = [':flag'],",
        ")",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':flag': 'default',",
        "    },",
        "    values = {},",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['default', 'actual'],",
        "    default_value = 'default',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:setter")).isFalse();
  }

  @Test
  public void doesNotRefineSettingWithSameValuesAndSameFlagValuesAndSameConstraintValues()
      throws Exception {
    useConfiguration(
        "--copt=-Dright",
        "--javacopt=-Dgood",
        "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'setting_a')",
        "constraint_value(name = 'value_a', constraint_setting = 'setting_a')",
        "config_setting(",
        "    name = 'refined',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_setting(",
        "    name = 'other',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")",
        "config_feature_flag(",
        "    name = 'flag2',",
        "    allowed_values = ['good', 'bad'],",
        "    default_value = 'good',",
        ")");
    assertThat(
            getConfigMatchingProvider("//test:refined")
                .refines(getConfigMatchingProvider("//test:other")))
        .isFalse();
  }

  @Test
  public void doesNotRefineSettingWithDifferentValuesAndSameFlagValuesAndSameConstraintValues()
      throws Exception {
    useConfiguration(
        "--copt=-Dright",
        "--javacopt=-Dgood",
        "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'setting_a')",
        "constraint_value(name = 'value_a', constraint_setting = 'setting_a')",
        "config_setting(",
        "    name = 'refined',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_setting(",
        "    name = 'other',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")",
        "config_feature_flag(",
        "    name = 'flag2',",
        "    allowed_values = ['good', 'bad'],",
        "    default_value = 'good',",
        ")");
    assertThat(
            getConfigMatchingProvider("//test:refined")
                .refines(getConfigMatchingProvider("//test:other")))
        .isFalse();
  }

  @Test
  public void doesNotRefineSettingWithSameValuesAndSameConstraintValuesAndDifferentFlagValues()
      throws Exception {
    useConfiguration(
        "--copt=-Dright",
        "--javacopt=-Dgood",
        "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'setting_a')",
        "constraint_value(name = 'value_a', constraint_setting = 'setting_a')",
        "config_setting(",
        "    name = 'refined',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        "    transitive_configs = [':flag'],",
        ")",
        "config_setting(",
        "    name = 'other',",
        "    flag_values = {",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        "    transitive_configs = [':flag2'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")",
        "config_feature_flag(",
        "    name = 'flag2',",
        "    allowed_values = ['good', 'bad'],",
        "    default_value = 'good',",
        ")");
    assertThat(
            getConfigMatchingProvider("//test:refined")
                .refines(getConfigMatchingProvider("//test:other")))
        .isFalse();
  }

  @Test
  public void
      doesNotRefineSettingWithDifferentValuesAndDifferentFlagValuesAndDifferentConstraintValues()
          throws Exception {
    useConfiguration(
        "--copt=-Dright",
        "--javacopt=-Dgood",
        "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'setting_a')",
        "constraint_value(name = 'value_a', constraint_setting = 'setting_a')",
        "constraint_setting(name = 'setting_b')",
        "constraint_value(name = 'value_b', constraint_setting = 'setting_b')",
        "config_setting(",
        "    name = 'refined',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        "    transitive_configs = [':flag'],",
        ")",
        "config_setting(",
        "    name = 'other',",
        "    flag_values = {",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_b',",
        "    ],",
        "    transitive_configs = [':flag2'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")",
        "config_feature_flag(",
        "    name = 'flag2',",
        "    allowed_values = ['good', 'bad'],",
        "    default_value = 'good',",
        ")");
    assertThat(
            getConfigMatchingProvider("//test:refined")
                .refines(getConfigMatchingProvider("//test:other")))
        .isFalse();
  }

  @Test
  public void doesNotRefineSettingWithDifferentValuesAndSubsetFlagValuesAndSubsetConstraintValues()
      throws Exception {
    useConfiguration(
        "--copt=-Dright",
        "--javacopt=-Dgood",
        "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'setting_a')",
        "constraint_value(name = 'value_a', constraint_setting = 'setting_a')",
        "constraint_setting(name = 'setting_b')",
        "constraint_value(name = 'value_b', constraint_setting = 'setting_b')",
        "config_setting(",
        "    name = 'refined',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "        ':value_b',",
        "    ],",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_setting(",
        "    name = 'other',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "    },",
        "    values = {",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")",
        "config_feature_flag(",
        "    name = 'flag2',",
        "    allowed_values = ['good', 'bad'],",
        "    default_value = 'good',",
        ")");
    assertThat(
            getConfigMatchingProvider("//test:refined")
                .refines(getConfigMatchingProvider("//test:other")))
        .isFalse();
  }

  @Test
  public void doesNotRefineSettingWithSubsetValuesAndSubsetFlagValuesAndDifferentConstraintValues()
      throws Exception {
    useConfiguration(
        "--copt=-Dright",
        "--javacopt=-Dgood",
        "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'setting_a')",
        "constraint_value(name = 'value_a', constraint_setting = 'setting_a')",
        "constraint_setting(name = 'setting_b')",
        "constraint_value(name = 'value_b', constraint_setting = 'setting_b')",
        "config_setting(",
        "    name = 'refined',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_setting(",
        "    name = 'other',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "    },",
        "    constraint_values = [",
        "        ':value_b',",
        "    ],",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")",
        "config_feature_flag(",
        "    name = 'flag2',",
        "    allowed_values = ['good', 'bad'],",
        "    default_value = 'good',",
        ")");
    assertThat(
            getConfigMatchingProvider("//test:refined")
                .refines(getConfigMatchingProvider("//test:other")))
        .isFalse();
  }

  @Test
  public void doesNotRefineSettingWithSubsetValuesAndSubsetConstraintValuesAndDifferentFlagValues()
      throws Exception {
    useConfiguration(
        "--copt=-Dright",
        "--javacopt=-Dgood",
        "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'setting_a')",
        "constraint_value(name = 'value_a', constraint_setting = 'setting_a')",
        "constraint_setting(name = 'setting_b')",
        "constraint_value(name = 'value_b', constraint_setting = 'setting_b')",
        "config_setting(",
        "    name = 'refined',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "        ':value_b',",
        "    ],",
        "    transitive_configs = [':flag'],",
        ")",
        "config_setting(",
        "    name = 'other',",
        "    flag_values = {",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        "    transitive_configs = [':flag2'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")",
        "config_feature_flag(",
        "    name = 'flag2',",
        "    allowed_values = ['good', 'bad'],",
        "    default_value = 'good',",
        ")");
    assertThat(
            getConfigMatchingProvider("//test:refined")
                .refines(getConfigMatchingProvider("//test:other")))
        .isFalse();
  }

  @Test
  public void doesNotRefineSettingIfThereIsNoOverlap() throws Exception {
    useConfiguration(
        "--copt=-Dright",
        "--javacopt=-Dgood",
        "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'setting_a')",
        "constraint_value(name = 'value_a', constraint_setting = 'setting_a')",
        "config_setting(",
        "    name = 'configA',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "config_setting(",
        "    name = 'configB',",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")");
    assertThat(
            getConfigMatchingProvider("//test:configA")
                .refines(getConfigMatchingProvider("//test:configB")))
        .isFalse();
    assertThat(
            getConfigMatchingProvider("//test:configB")
                .refines(getConfigMatchingProvider("//test:configA")))
        .isFalse();
  }

  @Test
  public void refinesSettingWithSubsetValuesAndSubsetConstraintValuesAndSameFlagValues()
      throws Exception {
    useConfiguration(
        "--copt=-Dright",
        "--javacopt=-Dgood",
        "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'setting_a')",
        "constraint_value(name = 'value_a', constraint_setting = 'setting_a')",
        "constraint_setting(name = 'setting_b')",
        "constraint_value(name = 'value_b', constraint_setting = 'setting_b')",
        "config_setting(",
        "    name = 'refined',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "        ':value_b',",
        "    ],",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_setting(",
        "    name = 'other',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "    },",
        "    constraint_values = [",
        "        ':value_b',",
        "    ],",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")",
        "config_feature_flag(",
        "    name = 'flag2',",
        "    allowed_values = ['good', 'bad'],",
        "    default_value = 'good',",
        ")");
    assertThat(
            getConfigMatchingProvider("//test:refined")
                .refines(getConfigMatchingProvider("//test:other")))
        .isTrue();
  }

  @Test
  public void refinesSettingWithSameValuesAndSubsetFlagValuesAndSubsetConstraintValues()
      throws Exception {
    useConfiguration(
        "--copt=-Dright",
        "--javacopt=-Dgood",
        "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'setting_a')",
        "constraint_value(name = 'value_a', constraint_setting = 'setting_a')",
        "constraint_setting(name = 'setting_b')",
        "constraint_value(name = 'value_b', constraint_setting = 'setting_b')",
        "config_setting(",
        "    name = 'refined',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "        ':value_b',",
        "    ],",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_setting(",
        "    name = 'other',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")",
        "config_feature_flag(",
        "    name = 'flag2',",
        "    allowed_values = ['good', 'bad'],",
        "    default_value = 'good',",
        ")");
    assertThat(
            getConfigMatchingProvider("//test:refined")
                .refines(getConfigMatchingProvider("//test:other")))
        .isTrue();
  }

  @Test
  public void refinesSettingWithSubsetValuesAndSubsetFlagValuesAndConstraintValues()
      throws Exception {
    useConfiguration(
        "--copt=-Dright",
        "--javacopt=-Dgood",
        "--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'setting_a')",
        "constraint_value(name = 'value_a', constraint_setting = 'setting_a')",
        "constraint_setting(name = 'setting_b')",
        "constraint_value(name = 'value_b', constraint_setting = 'setting_b')",
        "config_setting(",
        "    name = 'refined',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "        ':flag2': 'good',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "        'javacopt': '-Dgood',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "        ':value_b',",
        "    ],",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_setting(",
        "    name = 'other',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "    },",
        "    values = {",
        "        'copt': '-Dright',",
        "    },",
        "    constraint_values = [",
        "        ':value_a',",
        "    ],",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")",
        "config_feature_flag(",
        "    name = 'flag2',",
        "    allowed_values = ['good', 'bad'],",
        "    default_value = 'good',",
        ")");
    assertThat(
            getConfigMatchingProvider("//test:refined")
                .refines(getConfigMatchingProvider("//test:other")))
        .isTrue();
  }

  @Test
  public void refinesSettingWithSubsetConstraintValues() throws Exception {
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'setting_a')",
        "constraint_value(name = 'value_a', constraint_setting = 'setting_a')",
        "constraint_setting(name = 'setting_b')",
        "constraint_value(name = 'value_b', constraint_setting = 'setting_b')",
        "constraint_setting(name = 'setting_c')",
        "constraint_value(name = 'value_c', constraint_setting = 'setting_c')",
        "platform(",
        "    name = 'refined_platform',",
        "    constraint_values = [",
        "        ':value_a',",
        "        ':value_b',",
        "        ':value_c',",
        "    ],",
        ")",
        "platform(",
        "    name = 'other_platform',",
        "    constraint_values = [",
        "        ':value_a',",
        "        ':value_b',",
        "    ],",
        ")",
        "config_setting(",
        "    name = 'refined',",
        "    constraint_values = [",
        "        ':value_a',",
        "        ':value_b',",
        "        ':value_c',",
        "    ],",
        ")",
        "config_setting(",
        "    name = 'other',",
        "    constraint_values = [",
        "        ':value_a',",
        "        ':value_b',",
        "    ],",
        ");");
    useConfiguration("--platforms=//test:refined_platform");
    assertThat(
            getConfigMatchingProvider("//test:refined")
                .refines(getConfigMatchingProvider("//test:other")))
        .isTrue();
  }

  @Test
  public void matchesAliasedFlagsInFlagValues() throws Exception {
    useConfiguration("--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'alias_matcher',",
        "    flag_values = {",
        "        ':alias': 'right',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "alias(",
        "    name = 'alias',",
        "    actual = 'flag',",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:alias_matcher")).isTrue();
  }

  @Test
  public void aliasedFlagsAreCountedInRefining() throws Exception {
    useConfiguration("--enforce_transitive_configs_for_config_feature_flag");
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'refined',",
        "    flag_values = {",
        "        ':alias': 'right',",
        "        ':flag2': 'good',",
        "    },",
        "    transitive_configs = [':flag', ':flag2'],",
        ")",
        "config_setting(",
        "    name = 'other',",
        "    flag_values = {",
        "        ':flag': 'right',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "alias(",
        "    name = 'alias',",
        "    actual = 'flag',",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")",
        "config_feature_flag(",
        "    name = 'flag2',",
        "    allowed_values = ['good', 'bad'],",
        "    default_value = 'good',",
        ")");
    assertThat(
            getConfigMatchingProvider("//test:refined")
                .refines(getConfigMatchingProvider("//test:other")))
        .isTrue();
  }

  @Test
  public void referencingSameFlagViaMultipleAliasesFails() throws Exception {
    useConfiguration("--enforce_transitive_configs_for_config_feature_flag");
    checkError(
        "test",
        "multialias",
        "in flag_values attribute of config_setting rule //test:multialias: "
            + "flag '//test:direct' referenced multiple times as ['//test:alias', '//test:direct']",
        "config_setting(",
        "    name = 'multialias',",
        "    flag_values = {",
        "        ':alias': 'right',",
        "        ':direct': 'right',",
        "    },",
        "    transitive_configs = [':direct'],",
        ")",
        "alias(",
        "    name = 'alias',",
        "    actual = 'direct',",
        "    transitive_configs = [':direct'],",
        ")",
        "config_feature_flag(",
        "    name = 'direct',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")");
  }

  @Test
  public void requiresValidValueForFlagValues() throws Exception {
    useConfiguration("--enforce_transitive_configs_for_config_feature_flag");
    checkError(
        "test",
        "invalid_flag",
        "in flag_values attribute of config_setting rule //test:invalid_flag: "
            + "error while parsing user-defined configuration values: "
            + "'invalid' is not a valid value for '//test:flag'",
        "config_setting(",
        "    name = 'invalid_flag',",
        "    flag_values = {",
        "        ':flag': 'invalid',",
        "    },",
        "    transitive_configs = [':flag'])",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'valid'],",
        "    default_value = 'valid',",
        ")");
  }

  @Test
  public void usesAliasLabelWhenReportingErrorInFlagValues() throws Exception {
    useConfiguration("--enforce_transitive_configs_for_config_feature_flag");
    checkError(
        "test",
        "invalid_flag",
        "in flag_values attribute of config_setting rule //test:invalid_flag: "
            + "error while parsing user-defined configuration values: "
            + "'invalid' is not a valid value for '//test:alias'",
        "config_setting(",
        "    name = 'invalid_flag',",
        "    flag_values = {",
        "        ':alias': 'invalid',",
        "    },",
        "    transitive_configs = [':flag'])",
        "alias(",
        "    name = 'alias',",
        "    actual = ':flag',",
        "    transitive_configs = [':flag'],",
        ")",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'valid'],",
        "    default_value = 'valid',",
        ")");
  }

  @Test
  public void buildsettings_matchesFromDefault() throws Exception {
    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "string_flag = rule(implementation = _impl, build_setting = config.string(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'string_flag')",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':cheese': 'parmesan',",
        "    },",
        ")",
        "string_flag(name = 'cheese', build_setting_default = 'parmesan')");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  @Test
  public void buildsettings_matchesFromCommandLine() throws Exception {
    useConfiguration(ImmutableMap.of("//test:cheese", "gouda"));

    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "string_flag = rule(implementation = _impl, build_setting = config.string(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'string_flag')",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':cheese': 'gouda',",
        "    },",
        ")",
        "string_flag(name = 'cheese', build_setting_default = 'parmesan')");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  /**
   * Regression test to ensure that non-String typed build setting values are being properly
   * converted from Strings to their real type.
   */
  @Test
  public void buildsettings_convertedType() throws Exception {
    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "bool_flag = rule(implementation = _impl, build_setting = config.bool(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'bool_flag')",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':cheese': 'True',",
        "    },",
        ")",
        "bool_flag(name = 'cheese', build_setting_default = True)");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  @Test
  public void buildsettings_doesntMatch() throws Exception {
    useConfiguration(ImmutableMap.of("//test:cheese", "gouda"));

    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "string_flag = rule(implementation = _impl, build_setting = config.string(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'string_flag')",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':cheese': 'parmesan',",
        "    },",
        ")",
        "string_flag(name = 'cheese', build_setting_default = 'parmesan')");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
  }

  @Test
  public void buildsettings_badType() throws Exception {
    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "int_flag = rule(implementation = _impl, build_setting = config.int(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'int_flag')",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':wishes': 'gouda',",
        "    },",
        ")",
        "int_flag(name = 'wishes', build_setting_default = 3)");

    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//test:match");
    assertContainsEvent("'gouda' cannot be converted to //test:wishes type int");
  }

  @Test
  public void buildsettings_allowMultipleWorks() throws Exception {
    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "string_flag = rule(",
        "  implementation = _impl,",
        "  build_setting = config.string(flag = True, allow_multiple = True),",
        ")");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'string_flag')",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':cheese': 'pepperjack',",
        "    },",
        ")",
        "string_flag(name = 'cheese', build_setting_default = 'gouda')");
    useConfiguration(ImmutableMap.of("//test:cheese", ImmutableList.of("pepperjack", "brie")));
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  @Test
  public void buildsettings_repeatableWorks() throws Exception {
    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "string_list_flag = rule(",
        "  implementation = _impl,",
        "  build_setting = config.string_list(flag = True, repeatable = True),",
        ")");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'string_list_flag')",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':cheese': 'pepperjack',",
        "    },",
        ")",
        "string_list_flag(name = 'cheese', build_setting_default = ['gouda'])");

    useConfiguration(ImmutableMap.of("//test:cheese", ImmutableList.of("pepperjack", "brie")));
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  @Test
  public void buildsettings_repeatableWithoutFlagErrors() throws Exception {
    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "string_list_setting = rule(",
        "  implementation = _impl,",
        "  build_setting = config.string_list(repeatable = True),",
        ")");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'string_list_setting')",
        "string_list_setting(name = 'cheese', build_setting_default = ['gouda'])");

    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//test:cheese");
    assertContainsEvent("'repeatable' can only be set for a setting with 'flag = True'");
  }

  @Test
  public void notBuildSettingOrFeatureFlag() throws Exception {
    scratch.file(
        "test/rules.bzl",
        "def _impl(ctx):",
        "  return DefaultInfo()",
        "default_info_rule = rule(implementation = _impl)");
    scratch.file(
        "test/BUILD",
        "load('//test:rules.bzl', 'default_info_rule')",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':cheese': 'gouda',",
        "    },",
        ")",
        "default_info_rule(name = 'cheese')");

    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//test:match");
    assertContainsEvent(
        "flag_values keys must be build settings or feature flags and //test:cheese is not");
  }

  @Test
  public void buildsettingsMatch_featureFlagsMatch() throws Exception {
    useConfiguration("--enforce_transitive_configs_for_config_feature_flag");

    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "string_flag = rule(implementation = _impl, build_setting = config.string(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'string_flag')",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':cheese': 'parmesan',",
        "        ':flag': 'right',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "string_flag(name = 'cheese', build_setting_default = 'parmesan')",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right'],",
        "    default_value = 'right',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  @Test
  public void buildsettingsMatch_featureFlagsDontMatch() throws Exception {
    useConfiguration("--enforce_transitive_configs_for_config_feature_flag");

    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "string_flag = rule(implementation = _impl, build_setting = config.string(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'string_flag')",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':cheese': 'parmesan',",
        "        ':flag': 'wrong',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "string_flag(name = 'cheese', build_setting_default = 'parmesan')",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right', 'wrong'],",
        "    default_value = 'right',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
  }

  @Test
  public void buildsettingsDontMatch_featureFlagsMatch() throws Exception {
    useConfiguration("--enforce_transitive_configs_for_config_feature_flag");

    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "string_flag = rule(implementation = _impl, build_setting = config.string(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'string_flag')",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':cheese': 'gouda',",
        "        ':flag': 'right',",
        "    },",
        "    transitive_configs = [':flag'],",
        ")",
        "string_flag(name = 'cheese', build_setting_default = 'parmesan')",
        "config_feature_flag(",
        "    name = 'flag',",
        "    allowed_values = ['right'],",
        "    default_value = 'right',",
        ")");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
  }

  @Test
  public void constraintValue() throws Exception {
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'notable_building')",
        "constraint_value(name = 'empire_state', constraint_setting = 'notable_building')",
        "constraint_value(name = 'space_needle', constraint_setting = 'notable_building')",
        "platform(",
        "    name = 'new_york_platform',",
        "    constraint_values = [':empire_state'],",
        ")",
        "platform(",
        "    name = 'seattle_platform',",
        "    constraint_values = [':space_needle'],",
        ")",
        "config_setting(",
        "    name = 'match',",
        "    constraint_values = [':empire_state'],",
        ");");

    useConfiguration("--experimental_platforms=//test:new_york_platform");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration("--experimental_platforms=//test:seattle_platform");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
  }

  @Test
  public void multipleConstraintValues() throws Exception {
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'notable_building')",
        "constraint_value(name = 'empire_state', constraint_setting = 'notable_building')",
        "constraint_setting(name = 'museum')",
        "constraint_value(name = 'cloisters', constraint_setting = 'museum')",
        "constraint_setting(name = 'theme_park')",
        "constraint_value(name = 'coney_island', constraint_setting = 'theme_park')",
        "platform(",
        "    name = 'manhattan_platform',",
        "    constraint_values = [",
        "        ':empire_state',",
        "        ':cloisters',",
        "    ],",
        ")",
        "platform(",
        "    name = 'museum_platform',",
        "    constraint_values = [':cloisters'],",
        ")",
        "platform(",
        "    name = 'new_york_platform',",
        "    constraint_values = [",
        "        ':empire_state',",
        "        ':cloisters',",
        "        ':coney_island',",
        "    ],",
        ")",
        "config_setting(",
        "    name = 'match',",
        "    constraint_values = [':empire_state', ':cloisters'],",
        ");");
    useConfiguration("--experimental_platforms=//test:manhattan_platform");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration("--experimental_platforms=//test:museum_platform");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--experimental_platforms=//test:new_york_platform");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
  }

  @Test
  public void definesAndConstraints() throws Exception {
    scratch.file(
        "test/BUILD",
        "constraint_setting(name = 'notable_building')",
        "constraint_value(name = 'empire_state', constraint_setting = 'notable_building')",
        "constraint_value(name = 'space_needle', constraint_setting = 'notable_building')",
        "platform(",
        "    name = 'new_york_platform',",
        "    constraint_values = [':empire_state'],",
        ")",
        "platform(",
        "    name = 'seattle_platform',",
        "    constraint_values = [':space_needle'],",
        ")",
        "config_setting(",
        "    name = 'match',",
        "    constraint_values = [':empire_state'],",
        "    values = {",
        "        'define': 'a=c',",
        "    },",
        "    define_values = {",
        "        'b': 'd',",
        "    },",
        ");");

    useConfiguration(
        "--experimental_platforms=//test:new_york_platform", "--define", "a=c", "--define", "b=d");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isTrue();
    useConfiguration("--experimental_platforms=//test:new_york_platform");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "a=c");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
    useConfiguration("--define", "a=c", "--experimental_platforms=//test:new_york_platform");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:match")).isFalse();
  }

  /**
   * Tests that a config_setting doesn't allow a constraint_values list with more than one
   * constraint value per constraint setting.
   */
  @Test
  public void multipleValuesPerSetting() throws Exception {
    checkError(
        "foo",
        "bad",
        "in config_setting rule //foo:bad: "
            + "Duplicate constraint values detected: "
            + "constraint_setting //foo:notable_building has "
            + "[//foo:empire_state, //foo:space_needle], "
            + "constraint_setting //foo:museum has "
            + "[//foo:moma, //foo:sam]",
        "constraint_setting(name = 'notable_building')",
        "constraint_value(name = 'empire_state', constraint_setting = 'notable_building')",
        "constraint_value(name = 'space_needle', constraint_setting = 'notable_building')",
        "constraint_value(name = 'peace_arch', constraint_setting = 'notable_building')",
        "constraint_setting(name = 'museum')",
        "constraint_value(name = 'moma', constraint_setting = 'museum')",
        "constraint_value(name = 'sam', constraint_setting = 'museum')",
        "config_setting(",
        "    name = 'bad',",
        "    constraint_values = [",
        "        ':empire_state',",
        "        ':space_needle',",
        "        ':moma',",
        "        ':sam',",
        "    ],",
        ");");
  }

  @Test
  public void notAConstraintValue() throws Exception {
    checkError(
        "test",
        "match",
        "//test:what_am_i is not a constraint_value",
        "genrule(",
        "    name = 'what_am_i',",
        "    srcs = [],",
        "    outs = ['the_answer'],",
        "    cmd = 'echo an eternal enigma > $@')",
        "config_setting(",
        "    name = 'match',",
        "    constraint_values = [':what_am_i'],",
        ")");
  }

  private Set<LicenseType> getLicenses(String label) throws Exception {
    Rule rule = (Rule) getTarget(label);
    // There are two interfaces for retrieving a rule's license: from the Rule object and by
    // directly reading the "licenses" attribute. For config_setting both of these should always
    // be NONE. This method checks consistency between them.
    Set<LicenseType> fromRule = rule.getLicense().getLicenseTypes();
    Set<LicenseType> fromAttribute =
        RawAttributeMapper.of(rule).get("licenses", BuildType.LICENSE).getLicenseTypes();
    assertThat(fromRule).containsExactlyElementsIn(fromAttribute);
    return fromRule;
  }

  /** Tests that default license behavior is unaffected. */
  @Test
  public void licensesDefault() throws Exception {
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    values = {",
        "        'copt': '-Dfoo',",
        "    })");

    useConfiguration("--copt", "-Dfoo");
    assertThat(getLicenses("//test:match")).containsExactly(LicenseType.NONE);
  }

  /** Tests that third-party doesn't require a license from config_setting. */
  @Test
  public void thirdPartyLicenseRequirement() throws Exception {
    scratch.file(
        "third_party/test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    values = {",
        "        'copt': '-Dfoo',",
        "    })");

    useConfiguration("--copt", "-Dfoo");
    assertThat(getLicenses("//third_party/test:match")).containsExactly(LicenseType.NONE);
  }

  /** Tests that package-wide licenses are ignored by config_setting. */
  @Test
  public void packageLicensesIgnored() throws Exception {
    scratch.file(
        "test/BUILD",
        "licenses(['restricted'])",
        "config_setting(",
        "    name = 'match',",
        "    values = {",
        "        'copt': '-Dfoo',",
        "    })");

    useConfiguration("--copt", "-Dfoo");
    assertThat(getLicenses("//test:match")).containsExactly(LicenseType.NONE);
  }

  /** Tests that rule-specific licenses are ignored by config_setting. */
  @Test
  public void ruleLicensesUsed() throws Exception {
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    licenses = ['restricted'],",
        "    values = {",
        "        'copt': '-Dfoo',",
        "    })");

    useConfiguration("--copt", "-Dfoo");
    assertThat(getLicenses("//test:match")).containsExactly(LicenseType.NONE);
  }

  @Test
  public void simpleStarlarkFlag() throws Exception {
    scratch.file(
        "test/flagdef.bzl",
        "def _impl(ctx):",
        "    return []",
        "my_flag = rule(",
        "    implementation = _impl,",
        "    build_setting = config.string(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:flagdef.bzl', 'my_flag')",
        "my_flag(",
        "    name = 'flag',",
        "    build_setting_default = 'actual_flag_value')",
        "config_setting(",
        "    name = 'matches',",
        "    flag_values = {",
        "        ':flag': 'actual_flag_value',",
        "    })",
        "config_setting(",
        "    name = 'doesntmatch',",
        "    flag_values = {",
        "        ':flag': 'other_flag_value',",
        "    })");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:matches")).isTrue();
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:doesntmatch")).isFalse();
  }

  @Test
  public void starlarkListFlagSingleValue() throws Exception {
    // When a list-typed Starlark flag has value ["foo"], the config_setting's expected value "foo"
    // must match exactly.
    scratch.file(
        "test/flagdef.bzl",
        "def _impl(ctx):",
        "    return []",
        "my_flag = rule(",
        "    implementation = _impl,",
        "    build_setting = config.string_list(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:flagdef.bzl', 'my_flag')",
        "my_flag(",
        "    name = 'one_value_flag',",
        "    build_setting_default = ['one'])",
        "config_setting(",
        "    name = 'matches',",
        "    flag_values = {",
        "        ':one_value_flag': 'one',",
        "    })",
        "config_setting(",
        "    name = 'doesntmatch',",
        "    flag_values = {",
        "        ':one_value_flag': 'other',",
        "    })");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:matches")).isTrue();
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:doesntmatch")).isFalse();
  }

  @Test
  public void starlarkListFlagMultiValue() throws Exception {
    // When a list-typed Starlark flag has value ["foo", "bar"], the config_setting's expected
    // value "foo" must match *any* entry in the list.
    scratch.file(
        "test/flagdef.bzl",
        "def _impl(ctx):",
        "    return []",
        "my_flag = rule(",
        "    implementation = _impl,",
        "    build_setting = config.string_list(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:flagdef.bzl', 'my_flag')",
        "my_flag(",
        "    name = 'two_value_flag',",
        "    build_setting_default = ['one', 'two'])",
        "config_setting(",
        "    name = 'matches_one',",
        "    flag_values = {",
        "        ':two_value_flag': 'one',",
        "    })",
        "config_setting(",
        "    name = 'matches_two',",
        "    flag_values = {",
        "        ':two_value_flag': 'two',",
        "    })",
        "config_setting(",
        "    name = 'doesntmatch',",
        "    flag_values = {",
        "        ':two_value_flag': 'other',",
        "    })");
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:matches_one")).isTrue();
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:matches_two")).isTrue();
    assertThat(getConfigMatchingProviderResultAsBoolean("//test:doesntmatch")).isFalse();
  }

  @Test
  public void canOnlyMatchSingleValueInMultiValueFlags() throws Exception {
    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "string_list_flag = rule(",
        "  implementation = _impl,",
        "  build_setting = config.string_list(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'string_list_flag')",
        "string_list_flag(name = 'gouda', build_setting_default = ['smoked'])",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':gouda': 'smoked,fresh',",
        "    },",
        ")",
        "filegroup(",
        "  name = 'fg',",
        "  srcs = select({",
        "      ':match': []",
        "  }),",
        ")");
    reporter.removeHandler(failFastHandler); // expect errors
    assertThat(getConfiguredTarget("//test:fg")).isNull();
    assertContainsEvent(
        "\"smoked,fresh\" not a valid value for flag //test:gouda. "
            + "Only single, exact values are allowed");
  }

  @Test
  public void singleValueThatLooksLikeMultiValueIsOkay() throws Exception {
    scratch.file(
        "test/build_settings.bzl",
        "def _impl(ctx):",
        "  return []",
        "string_flag = rule(",
        "  implementation = _impl,",
        "  build_setting = config.string(flag = True))");
    scratch.file(
        "test/BUILD",
        "load('//test:build_settings.bzl', 'string_flag')",
        "string_flag(name = 'gouda', build_setting_default = 'smoked,fresh')",
        "config_setting(",
        "    name = 'match',",
        "    flag_values = {",
        "        ':gouda': 'smoked,fresh',",
        "    },",
        ")",
        "filegroup(",
        "  name = 'fg',",
        "  srcs = select({",
        "      ':match': []",
        "  }),",
        ")");
    assertThat(getConfiguredTarget("//test:fg")).isNotNull();
    assertNoEvents();
  }

  @Test
  public void labelInValuesError() throws Exception {
    scratch.file(
        "test/BUILD",
        "config_setting(",
        "    name = 'match',",
        "    values = {'//foo:bar': 'value'},",
        ")");
    reporter.removeHandler(failFastHandler); // expect errors
    assertThat(getConfiguredTarget("//test:match")).isNull();
    assertContainsEvent(
        "in values attribute of config_setting rule //test:match: '//foo:bar' is"
            + " not a valid setting name, but appears to be a label. Did you mean to place it in"
            + " flag_values instead?");
  }
}