// Copyright 2016 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.proto;

import static com.google.common.truth.Truth.assertThat;
import static com.google.devtools.build.lib.actions.util.ActionsTestUtil.getFirstArtifactEndingWith;
import static com.google.devtools.build.lib.actions.util.ActionsTestUtil.prettyArtifactNames;

import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.actions.Action;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.actions.FileWriteAction;
import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Unit tests for {@code proto_library}. */
@RunWith(JUnit4.class)
public class BazelProtoLibraryTest extends BuildViewTestCase {
  private boolean isThisBazel() {
    return getAnalysisMock().isThisBazel();
  }

  @Before
  public void setUp() throws Exception {
    useConfiguration("--proto_compiler=//proto:compiler");
    scratch.file("proto/BUILD", "licenses(['notice'])", "exports_files(['compiler'])");
  }

  @Test
  public void createsDescriptorSets() throws Exception {
    scratch.file(
        "x/BUILD",
        "proto_library(name='alias', deps = ['foo'])",
        "proto_library(name='foo', srcs=['foo.proto'])",
        "proto_library(name='alias_to_no_srcs', deps = ['no_srcs'])",
        "proto_library(name='no_srcs')");

    assertThat(getDescriptorOutput("//x:alias").getRootRelativePathString())
        .isEqualTo("x/alias-descriptor-set.proto.bin");
    assertThat(getDescriptorOutput("//x:foo").getRootRelativePathString())
        .isEqualTo("x/foo-descriptor-set.proto.bin");
    assertThat(getDescriptorOutput("//x:alias_to_no_srcs").getRootRelativePathString())
        .isEqualTo("x/alias_to_no_srcs-descriptor-set.proto.bin");
    assertThat(getDescriptorOutput("//x:no_srcs").getRootRelativePathString())
        .isEqualTo("x/no_srcs-descriptor-set.proto.bin");
  }

  @Test
  public void descriptorSets_ruleWithSrcsCallsProtoc() throws Exception {
    scratch.file("x/BUILD", "proto_library(name='foo', srcs=['foo.proto'])");
    Artifact file = getDescriptorOutput("//x:foo");

    assertThat(getGeneratingSpawnAction(file).getRemainingArguments())
        .containsAtLeast(
            "-Ix/foo.proto=x/foo.proto",
            "--descriptor_set_out=" + file.getExecPathString(),
            "x/foo.proto");
  }

  /** Asserts that we register a FileWriteAction with empty contents if there are no srcs. */
  @Test
  public void descriptorSets_ruleWithoutSrcsWritesEmptyFile() throws Exception {
    scratch.file("x/BUILD", "proto_library(name='no_srcs')");
    Action action = getDescriptorWriteAction("//x:no_srcs");
    assertThat(action).isInstanceOf(FileWriteAction.class);
    assertThat(((FileWriteAction) action).getFileContents()).isEmpty();
  }

  /**
   * Asserts that the actions creating descriptor sets for rule R, take as input (=depend on) all of
   * the descriptor sets of the transitive dependencies of R.
   *
   * <p>This is needed so that building R, that has a dependency R' which violates strict proto
   * deps, would break.
   */
  @Test
  public void descriptorSetsDependOnChildren() throws Exception {
    scratch.file(
        "x/BUILD",
        "proto_library(name='alias', deps = ['foo'])",
        "proto_library(name='foo', srcs=['foo.proto'], deps = ['bar'])",
        "proto_library(name='bar', srcs=['bar.proto'])",
        "proto_library(name='alias_to_no_srcs', deps = ['no_srcs'])",
        "proto_library(name='no_srcs')");

    assertThat(getDepsDescriptorSets(getDescriptorOutput("//x:alias")))
        .containsExactly("x/foo-descriptor-set.proto.bin", "x/bar-descriptor-set.proto.bin");
    assertThat(getDepsDescriptorSets(getDescriptorOutput("//x:foo")))
        .containsExactly("x/bar-descriptor-set.proto.bin");
    assertThat(getDepsDescriptorSets(getDescriptorOutput("//x:bar"))).isEmpty();
    assertThat(getDepsDescriptorSets(getDescriptorOutput("//x:alias_to_no_srcs")))
        .containsExactly("x/no_srcs-descriptor-set.proto.bin");
    assertThat(getDepsDescriptorSets(getDescriptorOutput("//x:no_srcs"))).isEmpty();
  }

  /**
   * Returns all of the inputs of the action that generated 'getDirectDescriptorSet', and which are
   * themselves descriptor sets.
   */
  private ImmutableList<String> getDepsDescriptorSets(Artifact descriptorSet) {
    ImmutableList.Builder<String> result = ImmutableList.builder();
    for (String input : prettyArtifactNames(getGeneratingAction(descriptorSet).getInputs())) {
      if (input.endsWith("-descriptor-set.proto.bin")) {
        result.add(input);
      }
    }
    return result.build();
  }

  @Test
  public void descriptorSetsAreExposedInProvider() throws Exception {
    scratch.file(
        "x/BUILD",
        "proto_library(name='alias', deps = ['foo'])",
        "proto_library(name='foo', srcs=['foo.proto'], deps = ['bar'])",
        "proto_library(name='bar', srcs=['bar.proto'])",
        "proto_library(name='alias_to_no_srcs', deps = ['no_srcs'])",
        "proto_library(name='no_srcs')");

    {
      ProtoInfo provider = getConfiguredTarget("//x:alias").get(ProtoInfo.PROVIDER);
      assertThat(provider.getDirectDescriptorSet().getRootRelativePathString())
          .isEqualTo("x/alias-descriptor-set.proto.bin");
      assertThat(prettyArtifactNames(provider.getTransitiveDescriptorSets()))
          .containsExactly(
              "x/alias-descriptor-set.proto.bin",
              "x/foo-descriptor-set.proto.bin",
              "x/bar-descriptor-set.proto.bin");
    }

    {
      ProtoInfo provider = getConfiguredTarget("//x:foo").get(ProtoInfo.PROVIDER);
      assertThat(provider.getDirectDescriptorSet().getRootRelativePathString())
          .isEqualTo("x/foo-descriptor-set.proto.bin");
      assertThat(prettyArtifactNames(provider.getTransitiveDescriptorSets()))
          .containsExactly("x/foo-descriptor-set.proto.bin", "x/bar-descriptor-set.proto.bin");
    }

    {
      ProtoInfo provider = getConfiguredTarget("//x:bar").get(ProtoInfo.PROVIDER);
      assertThat(provider.getDirectDescriptorSet().getRootRelativePathString())
          .isEqualTo("x/bar-descriptor-set.proto.bin");
      assertThat(prettyArtifactNames(provider.getTransitiveDescriptorSets()))
          .containsExactly("x/bar-descriptor-set.proto.bin");
    }

    {
      ProtoInfo provider = getConfiguredTarget("//x:alias_to_no_srcs").get(ProtoInfo.PROVIDER);
      assertThat(provider.getDirectDescriptorSet().getRootRelativePathString())
          .isEqualTo("x/alias_to_no_srcs-descriptor-set.proto.bin");
      assertThat(prettyArtifactNames(provider.getTransitiveDescriptorSets()))
          .containsExactly(
              "x/alias_to_no_srcs-descriptor-set.proto.bin", "x/no_srcs-descriptor-set.proto.bin");
    }

    {
      ProtoInfo provider = getConfiguredTarget("//x:no_srcs").get(ProtoInfo.PROVIDER);
      assertThat(provider.getDirectDescriptorSet().getRootRelativePathString())
          .isEqualTo("x/no_srcs-descriptor-set.proto.bin");
      assertThat(prettyArtifactNames(provider.getTransitiveDescriptorSets()))
          .containsExactly("x/no_srcs-descriptor-set.proto.bin");
    }
  }

  @Test
  public void testDescriptorSetOutput_strictDeps() throws Exception {
    useConfiguration("--proto_compiler=//proto:compiler", "--strict_proto_deps=error");
    scratch.file(
        "x/BUILD",
        "proto_library(name='nodeps', srcs=['nodeps.proto'])",
        "proto_library(name='withdeps', srcs=['withdeps.proto'], deps=[':dep1', ':dep2'])",
        "proto_library(name='depends_on_alias', srcs=['depends_on_alias.proto'], deps=[':alias'])",
        "proto_library(name='alias', deps=[':dep1', ':dep2'])",
        "proto_library(name='dep1', srcs=['dep1.proto'])",
        "proto_library(name='dep2', srcs=['dep2.proto'])");

    assertThat(getGeneratingSpawnAction(getDescriptorOutput("//x:nodeps")).getRemainingArguments())
        .containsAtLeast("--direct_dependencies", "x/nodeps.proto")
        .inOrder();

    assertThat(
            getGeneratingSpawnAction(getDescriptorOutput("//x:withdeps")).getRemainingArguments())
        .containsAtLeast("--direct_dependencies", "x/dep1.proto:x/dep2.proto:x/withdeps.proto")
        .inOrder();

    assertThat(
            getGeneratingSpawnAction(getDescriptorOutput("//x:depends_on_alias"))
                .getRemainingArguments())
        .containsAtLeast(
            "--direct_dependencies", "x/dep1.proto:x/dep2.proto:x/depends_on_alias.proto")
        .inOrder();
  }

  /**
   * When building a proto_library with multiple srcs (say foo.proto and bar.proto), we should allow
   * foo.proto to import bar.proto without tripping strict-deps checking. This means that
   * --direct_dependencies should list the srcs.
   */
  @Test
  public void testDescriptorSetOutput_strict_deps_multipleSrcs() throws Exception {
    useConfiguration("--proto_compiler=//proto:compiler", "--strict_proto_deps=error");
    ConfiguredTarget target =
        scratchConfiguredTarget(
            "x", "foo", "proto_library(name='foo', srcs=['foo.proto', 'bar.proto'])");
    Artifact file = getFirstArtifactEndingWith(getFilesToBuild(target), ".proto.bin");
    assertThat(file.getRootRelativePathString()).isEqualTo("x/foo-descriptor-set.proto.bin");

    assertThat(getGeneratingSpawnAction(file).getRemainingArguments())
        .containsAtLeast("--direct_dependencies", "x/foo.proto:x/bar.proto")
        .inOrder();
  }

  @Test
  public void testDescriptorSetOutput_strictDeps_disabled() throws Exception {
    useConfiguration("--proto_compiler=//proto:compiler", "--strict_proto_deps=off");
    scratch.file("x/BUILD", "proto_library(name='foo', srcs=['foo.proto'])");

    for (String arg :
        getGeneratingSpawnAction(getDescriptorOutput("//x:foo")).getRemainingArguments()) {
      assertThat(arg).doesNotContain("--direct_dependencies=");
    }
  }

  @Test
  public void testDisableProtoSourceRoot() throws Exception {
    useConfiguration(
        "--proto_compiler=//proto:compiler", "--incompatible_disable_proto_source_root");
    scratch.file("x/BUILD", "proto_library(name='x', srcs=['x.proto'], proto_source_root='x')");
    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//x:x");
    assertContainsEvent("this attribute is not supported anymore");
  }

  @Test
  public void testProtoSourceRootWithoutDeps() throws Exception {
    scratch.file(
        "x/foo/BUILD",
        "proto_library(",
        "    name = 'nodeps',",
        "    srcs = ['foo/nodeps.proto'],",
        "    proto_source_root = 'x/foo',",
        ")"
    );
    ConfiguredTarget protoTarget = getConfiguredTarget("//x/foo:nodeps");
    ProtoInfo sourcesProvider = protoTarget.get(ProtoInfo.PROVIDER);
    assertThat(sourcesProvider.getTransitiveProtoSourceRoots()).containsExactly("x/foo");

    assertThat(getGeneratingSpawnAction(getDescriptorOutput("//x/foo:nodeps"))
        .getRemainingArguments())
        .contains("--proto_path=x/foo");
  }

  @Test
  public void testProtoSourceRootWithoutDeps_notPackageName() throws Exception {
    scratch.file(
        "x/foo/BUILD",
        "proto_library(",
        "    name = 'nodeps',",
        "    srcs = ['foo/nodeps.proto'],",
        "    proto_source_root = 'something/else',",
        ")"
    );

    try {
      getConfiguredTarget("//x/foo:nodeps");
    } catch (AssertionError error) {
      assertThat(error)
          .hasMessageThat()
          .contains("proto_source_root must be the same as the package name (x/foo)");
      return;
    }
    throw new Exception("Target should have failed building.");
  }

  @Test
  public void testProtoSourceRootWithDepsDuplicate() throws Exception {
    scratch.file(
        "x/foo/BUILD",
        "proto_library(",
        "    name = 'withdeps',",
        "    srcs = ['foo/withdeps.proto'],",
        "    proto_source_root = 'x/foo',",
        "    deps = [':dep'],",
        ")",
        "proto_library(",
        "    name = 'dep',",
        "    srcs = ['foo/dep.proto'],",
        "    proto_source_root = 'x/foo',",
        ")"
    );
    ConfiguredTarget protoTarget = getConfiguredTarget("//x/foo:withdeps");
    ProtoInfo sourcesProvider = protoTarget.get(ProtoInfo.PROVIDER);
    assertThat(sourcesProvider.getTransitiveProtoSourceRoots()).containsExactly("x/foo");

    assertThat(getGeneratingSpawnAction(getDescriptorOutput("//x/foo:withdeps"))
        .getRemainingArguments())
        .contains("--proto_path=x/foo");
  }

  @Test
  public void testProtoSourceRootWithDeps() throws Exception {
    scratch.file(
        "x/foo/BUILD",
        "proto_library(",
        "    name = 'withdeps',",
        "    srcs = ['foo/withdeps.proto'],",
        "    proto_source_root = 'x/foo',",
        "    deps = ['//x/bar:dep', ':dep'],",
        ")",
        "proto_library(",
        "    name = 'dep',",
        "    srcs = ['foo/dep.proto'],",
        ")"
    );
    scratch.file(
        "x/bar/BUILD",
        "proto_library(",
        "    name = 'dep',",
        "    srcs = ['foo/dep.proto'],",
        "    proto_source_root = 'x/bar',",
        ")"
    );
    ConfiguredTarget protoTarget = getConfiguredTarget("//x/foo:withdeps");
    ProtoInfo sourcesProvider = protoTarget.get(ProtoInfo.PROVIDER);
    assertThat(sourcesProvider.getTransitiveProtoSourceRoots())
        .containsExactly("x/foo", "x/bar", ".");
  }

  @Test
  public void testExportedProtoSourceRoots() throws Exception {
    scratch.file("ad/BUILD",
        "proto_library(name='ad', proto_source_root='ad', srcs=['ad.proto'])");
    scratch.file("ae/BUILD",
        "proto_library(name='ae', proto_source_root='ae', srcs=['ae.proto'])");
    scratch.file("bd/BUILD",
        "proto_library(name='bd', proto_source_root='bd', srcs=['bd.proto'])");
    scratch.file("be/BUILD",
        "proto_library(name='be', proto_source_root='be', srcs=['be.proto'])");
    scratch.file("a/BUILD",
        "proto_library(",
        "    name='a',",
        "    proto_source_root='a',",
        "    srcs=['a.proto'],",
        "    exports=['//ae:ae'],",
        "    deps=['//ad:ad'])");
    scratch.file("b/BUILD",
        "proto_library(",
        "    name='b',",
        "    proto_source_root='b',",
        "    srcs=['b.proto'],",
        "    exports=['//be:be'],",
        "    deps=['//bd:bd'])");
    scratch.file("c/BUILD",
        "proto_library(",
        "    name='c',",
        "    proto_source_root='c',",
        "    srcs=['c.proto'],",
        "    exports=['//a:a'],",
        "    deps=['//b:b'])");

    ConfiguredTarget c = getConfiguredTarget("//c:c");
    // exported proto source roots should be the source root of the rule and the direct source roots
    // of its exports and nothing else (not the exports of its exports or the deps of its exports
    // or the exports of its deps)
    assertThat(c.get(ProtoInfo.PROVIDER).getExportedProtoSourceRoots()).containsExactly("a", "c");
  }

  @Test
  public void testProtoSourceRoot() throws Exception {
    scratch.file(
        "x/foo/BUILD",
        "proto_library(",
        "    name = 'banana',",
        "    srcs = ['foo.proto'],",
        "    proto_source_root = 'x/foo',",
        ")");

    ConfiguredTarget protoTarget = getConfiguredTarget("//x/foo:banana");
    ProtoInfo sourcesProvider = protoTarget.get(ProtoInfo.PROVIDER);

    assertThat(sourcesProvider.getDirectProtoSourceRoot()).isEqualTo("x/foo");
  }

  @Test
  public void testProtoSourceRootWithImportPrefix() throws Exception {
    if (!isThisBazel()) {
      return;
    }

    scratch.file(
        "a/BUILD",
        "proto_library(",
        "    name = 'a',",
        "    srcs = ['a.proto'],",
        "    proto_source_root = 'a',",
        "    import_prefix = 'foo')");

    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//a");
    assertContainsEvent("the 'proto_source_root' attribute is incompatible");
  }

  @Test
  public void testProtoSourceRootWithStripImportPrefix() throws Exception {
    scratch.file(
        "third_party/a/BUILD",
        "licenses(['unencumbered'])",
        "proto_library(",
        "    name = 'a',",
        "    srcs = ['a.proto'],",
        "    proto_source_root = 'third_party/a',",
        "    strip_import_prefix = 'third_party/a')");

    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//third_party/a");
    assertContainsEvent("the 'proto_source_root' attribute is incompatible");
  }

  @Test
  public void testIllegalStripImportPrefix() throws Exception {
    scratch.file(
        "third_party/a/BUILD",
        "licenses(['unencumbered'])",
        "proto_library(",
        "    name = 'a',",
        "    srcs = ['a.proto'],",
        "    strip_import_prefix = 'foo')");

    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//third_party/a");
    assertContainsEvent(
        ".proto file 'third_party/a/a.proto' is not under the specified strip prefix");
  }

  @Test
  public void testIllegalImportPrefix() throws Exception {
    if (!isThisBazel()) {
      return;
    }

    scratch.file(
        "a/BUILD",
        "proto_library(",
        "    name = 'a',",
        "    srcs = ['a.proto'],",
        "    import_prefix = '/foo')");

    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//a");
    assertContainsEvent("should be a relative path");
  }

  @Test
  public void testRelativeStripImportPrefix() throws Exception {
    scratch.file(
        "third_party/a/b/BUILD",
        "licenses(['unencumbered'])",
        "proto_library(",
        "    name = 'd',",
        "    srcs = ['c/d.proto'],",
        "    strip_import_prefix = 'c')");

    Iterable<String> commandLine =
        paramFileArgsForAction(getDescriptorWriteAction("//third_party/a/b:d"));
    String genfiles = getTargetConfiguration().getGenfilesFragment().toString();
    assertThat(commandLine)
        .contains("-Id.proto=" + genfiles + "/third_party/a/b/_virtual_imports/d/d.proto");
  }

  @Test
  public void testAbsoluteStripImportPrefix() throws Exception {
    scratch.file(
        "third_party/a/b/BUILD",
        "licenses(['unencumbered'])",
        "proto_library(",
        "    name = 'd',",
        "    srcs = ['c/d.proto'],",
        "    strip_import_prefix = '/third_party/a')");

    Iterable<String> commandLine =
        paramFileArgsForAction(getDescriptorWriteAction("//third_party/a/b:d"));
    String genfiles = getTargetConfiguration().getGenfilesFragment().toString();
    assertThat(commandLine)
        .contains("-Ib/c/d.proto=" + genfiles + "/third_party/a/b/_virtual_imports/d/b/c/d.proto");
  }

  @Test
  public void testStripImportPrefixAndImportPrefix() throws Exception {
    if (!isThisBazel()) {
      return;
    }

    scratch.file(
        "a/b/BUILD",
        "proto_library(",
        "    name = 'd',",
        "    srcs = ['c/d.proto'],",
        "    import_prefix = 'foo',",
        "    strip_import_prefix = 'c')");

    Iterable<String> commandLine = paramFileArgsForAction(getDescriptorWriteAction("//a/b:d"));
    String genfiles = getTargetConfiguration().getGenfilesFragment().toString();
    assertThat(commandLine)
        .contains("-Ifoo/d.proto=" + genfiles + "/a/b/_virtual_imports/d/foo/d.proto");
  }

  @Test
  public void testImportPrefixWithoutStripImportPrefix() throws Exception {
    if (!isThisBazel()) {
      return;
    }

    scratch.file(
        "a/b/BUILD",
        "proto_library(",
        "    name = 'd',",
        "    srcs = ['c/d.proto'],",
        "    import_prefix = 'foo')");

    Iterable<String> commandLine = paramFileArgsForAction(getDescriptorWriteAction("//a/b:d"));
    String genfiles = getTargetConfiguration().getGenfilesFragment().toString();
    assertThat(commandLine)
        .contains("-Ifoo/a/b/c/d.proto=" + genfiles + "/a/b/_virtual_imports/d/foo/a/b/c/d.proto");
  }

  @Test
  public void testDotInStripImportPrefix() throws Exception {
    scratch.file(
        "third_party/a/b/BUILD",
        "licenses(['unencumbered'])",
        "proto_library(",
        "    name = 'd',",
        "    srcs = ['c/d.proto'],",
        "    strip_import_prefix = './c')");

    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//third_party/a/b:d");
    assertContainsEvent("should be normalized");
  }

  @Test
  public void testDotDotInStripImportPrefix() throws Exception {
    scratch.file(
        "third_party/a/b/BUILD",
        "licenses(['unencumbered'])",
        "proto_library(",
        "    name = 'd',",
        "    srcs = ['c/d.proto'],",
        "    strip_import_prefix = '../b/c')");

    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//third_party/a/b:d");
    assertContainsEvent("should be normalized");
  }

  @Test
  public void testDotInImportPrefix() throws Exception {
    if (!isThisBazel()) {
      return;
    }

    scratch.file(
        "a/b/BUILD",
        "proto_library(",
        "    name = 'd',",
        "    srcs = ['c/d.proto'],",
        "    import_prefix = './e')");

    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//a/b:d");
    assertContainsEvent("should be normalized");
  }

  @Test
  public void testDotDotInImportPrefix() throws Exception {
    if (!isThisBazel()) {
      return;
    }

    scratch.file(
        "a/b/BUILD",
        "proto_library(",
        "    name = 'd',",
        "    srcs = ['c/d.proto'],",
        "    import_prefix = '../e')");

    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//a/b:d");
    assertContainsEvent("should be normalized");
  }

  @Test
  public void testStripImportPrefixWithStrictProtoDeps() throws Exception {
    if (!isThisBazel()) {
      return;
    }

    useConfiguration("--strict_proto_deps=STRICT");
    scratch.file(
        "a/b/BUILD",
        "proto_library(",
        "    name = 'd',",
        "    srcs = ['c/d.proto','c/e.proto'],",
        "    strip_import_prefix = 'c')");

    Iterable<String> commandLine = paramFileArgsForAction(getDescriptorWriteAction("//a/b:d"));
    assertThat(commandLine).containsAtLeast("--direct_dependencies", "d.proto:e.proto").inOrder();
  }

  @Test
  public void testDepOnStripImportPrefixWithStrictProtoDeps() throws Exception {
    if (!isThisBazel()) {
      return;
    }

    useConfiguration("--strict_proto_deps=STRICT");
    scratch.file(
        "a/b/BUILD",
        "proto_library(",
        "    name = 'd',",
        "    srcs = ['c/d.proto'],",
        "    strip_import_prefix = 'c')");
    scratch.file(
        "a/b/e/BUILD",
        "proto_library(",
        "    name = 'e',",
        "    srcs = ['e.proto'],",
        "    deps = ['//a/b:d'])");

    Iterable<String> commandLine = paramFileArgsForAction(getDescriptorWriteAction("//a/b/e:e"));
    assertThat(commandLine)
        .containsAtLeast("--direct_dependencies", "d.proto:a/b/e/e.proto")
        .inOrder();
  }

  @Test
  public void testStripImportPrefixAndImportPrefixWithStrictProtoDeps() throws Exception {
    if (!isThisBazel()) {
      return;
    }

    useConfiguration("--strict_proto_deps=STRICT");
    scratch.file(
        "a/b/BUILD",
        "proto_library(",
        "    name = 'd',",
        "    srcs = ['c/d.proto'],",
        "    import_prefix = 'foo',",
        "    strip_import_prefix = 'c')");

    Iterable<String> commandLine = paramFileArgsForAction(getDescriptorWriteAction("//a/b:d"));
    assertThat(commandLine).containsAtLeast("--direct_dependencies", "foo/d.proto").inOrder();
  }

  @Test
  public void testStripImportPrefixForExternalRepositories() throws Exception {
    if (!isThisBazel()) {
      return;
    }

    FileSystemUtils.appendIsoLatin1(
        scratch.resolve("WORKSPACE"), "local_repository(name = 'foo', path = '/foo')");
    invalidatePackages();

    scratch.file("/foo/WORKSPACE");
    scratch.file(
        "/foo/x/y/BUILD",
        "proto_library(",
        "    name = 'q',",
        "    srcs = ['z/q.proto'],",
        "    strip_import_prefix = '/x')");

    scratch.file("a/BUILD", "proto_library(name='a', srcs=['a.proto'], deps=['@foo//x/y:q'])");

    Iterable<String> commandLine = paramFileArgsForAction(getDescriptorWriteAction("//a:a"));
    String genfiles = getTargetConfiguration().getGenfilesFragment().toString();
    assertThat(commandLine)
        .contains("-Iy/z/q.proto=" + genfiles + "/external/foo/x/y/_virtual_imports/q/y/z/q.proto");
  }

  private Artifact getDescriptorOutput(String label) throws Exception {
    return getFirstArtifactEndingWith(getFilesToBuild(getConfiguredTarget(label)), ".proto.bin");
  }

  private Action getDescriptorWriteAction(String label) throws Exception {
    return getGeneratingAction(getDescriptorOutput(label));
  }
}