// Copyright 2018 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.skydoc;

import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertThrows;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.analysis.util.BuildViewTestCase; // a bad dependency!
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.packages.semantics.BuildLanguageOptions;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.skydoc.SkydocMain.StarlarkEvaluationException;
import com.google.devtools.build.skydoc.rendering.DocstringParseException;
import com.google.devtools.build.skydoc.rendering.FunctionUtil;
import com.google.devtools.build.skydoc.rendering.ProtoRenderer;
import com.google.devtools.build.skydoc.rendering.proto.StardocOutputProtos.AspectInfo;
import com.google.devtools.build.skydoc.rendering.proto.StardocOutputProtos.AttributeType;
import com.google.devtools.build.skydoc.rendering.proto.StardocOutputProtos.ModuleInfo;
import com.google.devtools.build.skydoc.rendering.proto.StardocOutputProtos.ProviderInfo;
import com.google.devtools.build.skydoc.rendering.proto.StardocOutputProtos.RuleInfo;
import com.google.devtools.build.skydoc.rendering.proto.StardocOutputProtos.StarlarkFunctionInfo;
import java.io.IOException;
import java.util.Map;
import java.util.stream.Collectors;
import net.starlark.java.eval.StarlarkFunction;
import net.starlark.java.eval.StarlarkSemantics;
import net.starlark.java.syntax.ParserInput;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Java tests for Skydoc. */
@RunWith(JUnit4.class)
// TODO(adonovan): Skydoc's tests should not depend on the analysis phase of Blaze.
public final class SkydocTest extends BuildViewTestCase {

  private SkydocMain skydocMain;

  @Before
  public void setUp() throws IOException {
    scratch.dir("/execroot/io_bazel");
    scratch.setWorkingDir("/execroot/io_bazel");

    skydocMain =
        new SkydocMain(
            new StarlarkFileAccessor() {

              @Override
              public ParserInput inputSource(String pathString) throws IOException {
                if (!pathString.startsWith("/")) {
                  pathString = "/execroot/io_bazel/" + pathString;
                }
                Path path = fileSystem.getPath(pathString);
                byte[] bytes = FileSystemUtils.asByteSource(path).read();
                return ParserInput.fromLatin1(bytes, path.toString());
              }

              @Override
              public boolean fileExists(String pathString) {
                if (!pathString.startsWith("/")) {
                  pathString = "/execroot/io_bazel/" + pathString;
                }
                return fileSystem.exists(fileSystem.getPath(pathString));
              }
            },
            "io_bazel",
            ImmutableList.of("/other_root", "."));
  }

  @Test
  public void testStarlarkEvaluationError() throws Exception {
    scratch.file(
        "/execroot/io_bazel/test/a.bzl", //
        "def f(): 1//0",
        "f()");
    StarlarkEvaluationException ex =
        assertThrows(
            StarlarkEvaluationException.class,
            () ->
                skydocMain.eval(
                    StarlarkSemantics.DEFAULT,
                    Label.parseAbsoluteUnchecked("//test:a.bzl"),
                    ImmutableMap.builder(),
                    ImmutableMap.builder(),
                    ImmutableMap.builder(),
                    ImmutableMap.builder(),
                    ImmutableMap.builder()));
    String msg = ex.getMessage();
    assertThat(msg).contains("Traceback");
    assertThat(msg).contains("line 2, column 2, in <toplevel>");
    assertThat(msg).contains("line 1, column 11, in f");
    assertThat(msg).contains("Error: integer division by zero");
  }

  @Test
  public void testRuleInfoAttrs() throws Exception {
    scratch.file(
        "/execroot/io_bazel/test/test.bzl",
        "def rule_impl(ctx):",
        "  return []",
        "",
        "my_rule = rule(",
        "    doc = 'This is my rule. It does stuff.',",
        "    implementation = rule_impl,",
        "    attrs = {",
        "        'a': attr.label(mandatory=True, allow_single_file=True),",
        "        'b': attr.string_dict(mandatory=True),",
        "        'c': attr.output(mandatory=True),",
        "        'd': attr.bool(default=False, mandatory=False),",
        "    },",
        ")");

    ImmutableMap.Builder<String, RuleInfo> ruleInfoMap = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:test.bzl"),
        ruleInfoMap,
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder());
    Map<String, RuleInfo> ruleInfos = ruleInfoMap.build();
    assertThat(ruleInfos).hasSize(1);

    RuleInfo ruleInfo = Iterables.getOnlyElement(ruleInfos.values());
    assertThat(ruleInfo.getRuleName()).isEqualTo("my_rule");
    assertThat(ruleInfo.getDocString()).isEqualTo("This is my rule. It does stuff.");
    assertThat(getAttrNames(ruleInfo)).containsExactly("name", "a", "b", "c", "d").inOrder();
    assertThat(getAttrTypes(ruleInfo))
        .containsExactly(
            AttributeType.NAME,
            AttributeType.LABEL,
            AttributeType.STRING_DICT,
            AttributeType.OUTPUT,
            AttributeType.BOOLEAN)
        .inOrder();
  }

  private static Iterable<String> getAttrNames(RuleInfo ruleInfo) {
    return ruleInfo.getAttributeList().stream()
        .map(attr -> attr.getName())
        .collect(Collectors.toList());
  }

  private static Iterable<String> getAttrNames(AspectInfo aspectInfo) {
    return aspectInfo.getAttributeList().stream()
        .map(attr -> attr.getName())
        .collect(Collectors.toList());
  }

  private static Iterable<AttributeType> getAttrTypes(RuleInfo ruleInfo) {
    return ruleInfo.getAttributeList().stream()
        .map(attr -> attr.getType())
        .collect(Collectors.toList());
  }

  private static Iterable<AttributeType> getAttrTypes(AspectInfo aspectInfo) {
    return aspectInfo.getAttributeList().stream()
        .map(attr -> attr.getType())
        .collect(Collectors.toList());
  }

  @Test
  public void testMultipleRuleNames() throws Exception {
    scratch.file(
        "/execroot/io_bazel/test/test.bzl",
        "def rule_impl(ctx):",
        "  return []",
        "",
        "rule_one = rule(",
        "    doc = 'Rule one',",
        "    implementation = rule_impl,",
        ")",
        "",
        "rule(",
        "    doc = 'This rule is not named',",
        "    implementation = rule_impl,",
        ")",
        "",
        "rule(",
        "    doc = 'This rule also is not named',",
        "    implementation = rule_impl,",
        ")",
        "",
        "rule_two = rule(",
        "    doc = 'Rule two',",
        "    implementation = rule_impl,",
        ")");

    ImmutableMap.Builder<String, RuleInfo> ruleInfoMap = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:test.bzl"),
        ruleInfoMap,
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder());

    assertThat(ruleInfoMap.build().keySet()).containsExactly("rule_one", "rule_two");
  }

  @Test
  public void testRulesAcrossMultipleFiles() throws Exception {
    scratch.file("/execroot/io_bazel/lib/rule_impl.bzl", "def rule_impl(ctx):", "  return []");

    scratch.file("/other_root/deps/foo/other_root.bzl", "doc_string = 'Dep rule'");

    scratch.file(
        "/execroot/io_bazel/deps/foo/dep_rule.bzl",
        "load('//lib:rule_impl.bzl', 'rule_impl')",
        "load(':other_root.bzl', 'doc_string')",
        "",
        "_hidden_rule = rule(",
        "    doc = doc_string,",
        "    implementation = rule_impl,",
        ")",
        "",
        "dep_rule = rule(",
        "    doc = doc_string,",
        "    implementation = rule_impl,",
        ")");

    scratch.file(
        "/execroot/io_bazel/test/main.bzl",
        "load('//lib:rule_impl.bzl', 'rule_impl')",
        "load('//deps/foo:dep_rule.bzl', 'dep_rule')",
        "",
        "main_rule = rule(",
        "    doc = 'Main rule',",
        "    implementation = rule_impl,",
        ")");

    ImmutableMap.Builder<String, RuleInfo> ruleInfoMapBuilder = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:main.bzl"),
        ruleInfoMapBuilder,
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder());

    Map<String, RuleInfo> ruleInfoMap = ruleInfoMapBuilder.build();

    assertThat(ruleInfoMap.keySet()).containsExactly("main_rule");
    assertThat(ruleInfoMap.get("main_rule").getDocString()).isEqualTo("Main rule");
  }

  @Test
  public void testRulesAcrossRepository() throws Exception {
    scratch.file(
        "/execroot/io_bazel/external/dep_repo/lib/rule_impl.bzl",
        "def rule_impl(ctx):",
        "  return []");

    scratch.file("/execroot/io_bazel/deps/foo/docstring.bzl", "doc_string = 'Dep rule'");

    scratch.file(
        "/execroot/io_bazel/deps/foo/dep_rule.bzl",
        "load('@dep_repo//lib:rule_impl.bzl', 'rule_impl')",
        "load(':docstring.bzl', 'doc_string')",
        "",
        "_hidden_rule = rule(",
        "    doc = doc_string,",
        "    implementation = rule_impl,",
        ")",
        "",
        "dep_rule = rule(",
        "    doc = doc_string,",
        "    implementation = rule_impl,",
        ")");

    scratch.file(
        "/execroot/io_bazel/test/main.bzl",
        "load('@dep_repo//lib:rule_impl.bzl', 'rule_impl')",
        "load('//deps/foo:dep_rule.bzl', 'dep_rule')",
        "",
        "main_rule = rule(",
        "    doc = 'Main rule',",
        "    implementation = rule_impl,",
        ")");

    ImmutableMap.Builder<String, RuleInfo> ruleInfoMapBuilder = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:main.bzl"),
        ruleInfoMapBuilder,
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder());

    Map<String, RuleInfo> ruleInfoMap = ruleInfoMapBuilder.build();

    assertThat(ruleInfoMap.keySet()).containsExactly("main_rule");
    assertThat(ruleInfoMap.get("main_rule").getDocString()).isEqualTo("Main rule");
  }

  @Test
  public void testRulesAcrossRepositorySiblingRepositoryLayout() throws Exception {
    scratch.file("/execroot/dep_repo/lib/rule_impl.bzl", "def rule_impl(ctx):", "  return []");

    scratch.file("/execroot/io_bazel/deps/foo/docstring.bzl", "doc_string = 'Dep rule'");

    scratch.file(
        "/execroot/io_bazel/deps/foo/dep_rule.bzl",
        "load('@dep_repo//lib:rule_impl.bzl', 'rule_impl')",
        "load(':docstring.bzl', 'doc_string')",
        "",
        "_hidden_rule = rule(",
        "    doc = doc_string,",
        "    implementation = rule_impl,",
        ")",
        "",
        "dep_rule = rule(",
        "    doc = doc_string,",
        "    implementation = rule_impl,",
        ")");

    scratch.file(
        "/execroot/io_bazel/test/main.bzl",
        "load('@dep_repo//lib:rule_impl.bzl', 'rule_impl')",
        "load('//deps/foo:dep_rule.bzl', 'dep_rule')",
        "",
        "main_rule = rule(",
        "    doc = 'Main rule',",
        "    implementation = rule_impl,",
        ")");

    ImmutableMap.Builder<String, RuleInfo> ruleInfoMapBuilder = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.builder()
            .setBool(BuildLanguageOptions.EXPERIMENTAL_SIBLING_REPOSITORY_LAYOUT, true)
            .build(),
        Label.parseAbsoluteUnchecked("//test:main.bzl"),
        ruleInfoMapBuilder,
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder());

    Map<String, RuleInfo> ruleInfoMap = ruleInfoMapBuilder.build();

    assertThat(ruleInfoMap.keySet()).containsExactly("main_rule");
    assertThat(ruleInfoMap.get("main_rule").getDocString()).isEqualTo("Main rule");
  }

  @Test
  public void testLoadOwnRepository() throws Exception {
    scratch.file("/execroot/io_bazel/deps/foo/dep_rule.bzl", "def rule_impl(ctx):", "  return []");

    scratch.file(
        "/execroot/io_bazel/test/main.bzl",
        "load('@io_bazel//deps/foo:dep_rule.bzl', 'rule_impl')",
        "",
        "main_rule = rule(",
        "    doc = 'Main rule',",
        "    implementation = rule_impl,",
        ")");

    ImmutableMap.Builder<String, RuleInfo> ruleInfoMapBuilder = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:main.bzl"),
        ruleInfoMapBuilder,
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder());

    Map<String, RuleInfo> ruleInfoMap = ruleInfoMapBuilder.build();

    assertThat(ruleInfoMap.keySet()).containsExactly("main_rule");
    assertThat(ruleInfoMap.get("main_rule").getDocString()).isEqualTo("Main rule");
  }

  @Test
  public void testSkydocCrashesOnCycle() throws Exception {
    scratch.file(
        "/execroot/io_bazel/dep/dep.bzl",
        "load('//test:main.bzl', 'some_var')",
        "def rule_impl(ctx):",
        "  return []");

    scratch.file(
        "/execroot/io_bazel/test/main.bzl",
        "load('//dep:dep.bzl', 'rule_impl')",
        "",
        "some_var = 1",
        "",
        "main_rule = rule(",
        "    doc = 'Main rule',",
        "    implementation = rule_impl,",
        ")");

    StarlarkEvaluationException expected =
        assertThrows(
            StarlarkEvaluationException.class,
            () ->
                skydocMain.eval(
                    StarlarkSemantics.DEFAULT,
                    Label.parseAbsoluteUnchecked("//test:main.bzl"),
                    ImmutableMap.builder(),
                    ImmutableMap.builder(),
                    ImmutableMap.builder(),
                    ImmutableMap.builder(),
                    ImmutableMap.builder()));

    assertThat(expected).hasMessageThat().contains("cycle with test/main.bzl");
  }

  @Test
  public void testMalformedFunctionDocstring() throws Exception {
    scratch.file(
        "/execroot/io_bazel/test/main.bzl",
        "def check_sources(name,",
        "                  required_param,",
        "                  bool_param = True,",
        "                  srcs = []):",
        "    \"\"\"Runs some checks on the given source files.",
        "",
        "    This rule runs checks on a given set of source files.",
        "    Use `bazel build` to run the check.",
        "",
        "    Args:",
        "        name: A unique name for this rule.",
        "        required_param:",
        "        bool_param: ..oh hey I forgot to document required_param!",
        "    \"\"\"",
        "    pass");

    ImmutableMap.Builder<String, StarlarkFunction> functionInfoBuilder = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:main.bzl"),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        functionInfoBuilder,
        ImmutableMap.builder(),
        ImmutableMap.builder());

    StarlarkFunction checkSourcesFn = functionInfoBuilder.build().get("check_sources");
    DocstringParseException expected =
        assertThrows(
            DocstringParseException.class,
            () -> FunctionUtil.fromNameAndFunction("check_sources", checkSourcesFn));
    assertThat(expected)
        .hasMessageThat()
        .contains(
            "Unable to generate documentation for function check_sources "
                + "(defined at /execroot/io_bazel/test/main.bzl:1:5) "
                + "due to malformed docstring. Parse errors:");
    assertThat(expected)
        .hasMessageThat()
        .contains(
            "/test/main.bzl:1:5 line 8: invalid parameter documentation "
                + "(expected format: \"parameter_name: documentation\").");
  }

  @Test
  public void testFuncInfoParams() throws Exception {
    scratch.file(
        "/execroot/io_bazel/test/test.bzl",
        "def check_function(foo, bar, baz):",
        "  \"\"\"Runs some checks on the given function parameter.",
        "  ",
        "  This rule runs checks on a given function parameter.",
        "  ",
        "  Args:",
        "    foo: A unique parameter for this rule.",
        "    bar: A unique parameter for this rule.",
        "    baz: A unique parameter for this rule.",
        "  ",
        "  \"\"\"",
        "  pass");

    ImmutableMap.Builder<String, StarlarkFunction> funcInfoMap = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:test.bzl"),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        funcInfoMap,
        ImmutableMap.builder(),
        ImmutableMap.builder());

    Map<String, StarlarkFunction> functions = funcInfoMap.build();
    assertThat(functions).hasSize(1);

    ModuleInfo moduleInfo =
        new ProtoRenderer().appendStarlarkFunctionInfos(functions).getModuleInfo().build();
    StarlarkFunctionInfo funcInfo = moduleInfo.getFuncInfo(0);
    assertThat(funcInfo.getFunctionName()).isEqualTo("check_function");
    assertThat(getParamNames(funcInfo)).containsExactly("foo", "bar", "baz").inOrder();
  }

  private static Iterable<String> getParamNames(StarlarkFunctionInfo funcInfo) {
    return funcInfo.getParameterList().stream()
        .map(param -> param.getName())
        .collect(Collectors.toList());
  }

  @Test
  public void testProviderInfo() throws Exception {
    scratch.file(
        "/execroot/io_bazel/test/test.bzl",
        "MyExampleInfo = provider(",
        "  doc = 'Stores information about example.',",
        "  fields = {",
        "    'name' : 'A string representing a random name.',",
        "    'city' : 'A string representing a city.',",
        "  },",
        ")",
        "pass");

    ImmutableMap.Builder<String, ProviderInfo> providerInfoMap = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:test.bzl"),
        ImmutableMap.builder(),
        providerInfoMap,
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder());

    Map<String, ProviderInfo> providers = providerInfoMap.build();
    assertThat(providers).hasSize(1);

    ModuleInfo moduleInfo =
        new ProtoRenderer().appendProviderInfos(providers.values()).getModuleInfo().build();
    ProviderInfo providerInfo = moduleInfo.getProviderInfo(0);
    assertThat(providerInfo.getProviderName()).isEqualTo("MyExampleInfo");
    assertThat(providerInfo.getDocString()).isEqualTo("Stores information about example.");
    assertThat(getFieldNames(providerInfo)).containsExactly("name", "city").inOrder();
    assertThat(getFieldDocString(providerInfo))
        .containsExactly("A string representing a random name.", "A string representing a city.")
        .inOrder();
  }

  private static Iterable<String> getFieldNames(ProviderInfo providerInfo) {
    return providerInfo.getFieldInfoList().stream()
        .map(field -> field.getName())
        .collect(Collectors.toList());
  }

  private static Iterable<String> getFieldDocString(ProviderInfo providerInfo) {
    return providerInfo.getFieldInfoList().stream()
        .map(field -> field.getDocString())
        .collect(Collectors.toList());
  }

  @Test
  public void testAspectInfo() throws Exception {
    scratch.file(
        "/execroot/io_bazel/test/test.bzl",
        "def my_aspect_impl(ctx):\n"
            + "    return []\n"
            + "\n"
            + "my_aspect = aspect(\n"
            + "    implementation = my_aspect_impl,\n"
            + "    doc = \"This is my aspect. It does stuff.\",\n"
            + "    attr_aspects = [\"deps\"],\n"
            + "    attrs = {\n"
            + "        \"first\": attr.label(mandatory = True, allow_single_file = True),\n"
            + "        \"second\": attr.string_dict(mandatory = True),\n"
            + "        \"_third\": attr.label(mandatory = True, allow_single_file = True),\n"
            + "    },\n"
            + ")");

    ImmutableMap.Builder<String, AspectInfo> aspectInfoMap = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:test.bzl"),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        aspectInfoMap,
        ImmutableMap.builder());
    Map<String, AspectInfo> aspectInfos = aspectInfoMap.build();
    assertThat(aspectInfos).hasSize(1);

    ModuleInfo moduleInfo =
        new ProtoRenderer().appendAspectInfos(aspectInfos.values()).getModuleInfo().build();
    AspectInfo aspectInfo = moduleInfo.getAspectInfo(0);
    assertThat(aspectInfo.getAspectName()).isEqualTo("my_aspect");
    assertThat(aspectInfo.getDocString()).isEqualTo("This is my aspect. It does stuff.");
    assertThat(getAttrNames(aspectInfo)).containsExactly("name", "first", "second").inOrder();
    assertThat(getAttrTypes(aspectInfo))
        .containsExactly(AttributeType.NAME, AttributeType.LABEL, AttributeType.STRING_DICT)
        .inOrder();
    assertThat(aspectInfo.getAspectAttributeList()).containsExactly("deps");
  }

  @Test
  public void testModuleDocstring() throws Exception {
    scratch.file(
        "/execroot/io_bazel/test/test.bzl",
        "\"\"\"Input file to test module docstring\"\"\"",
        "def check_function(foo):",
        "  \"\"\"Runs some checks on the given function parameter.",
        " ",
        "Args:",
        "foo: A unique parameter for this rule.",
        "\"\"\"",
        "pass");
    ImmutableMap.Builder<Label, String> moduleDocMap = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:test.bzl"),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        moduleDocMap);
    Map<Label, String> moduleDocInfo = moduleDocMap.build();
    Label label = Label.parseAbsoluteUnchecked("//test:test.bzl");
    assertThat(moduleDocInfo).hasSize(1);

    ModuleInfo moduleInfo =
        new ProtoRenderer().setModuleDocstring(moduleDocInfo.get(label)).getModuleInfo().build();
    String moduleDoc = moduleInfo.getModuleDocstring();
    assertThat(moduleDoc).isEqualTo("Input file to test module docstring");
  }

  @Test
  public void testnoModuleDoc() throws Exception {
    scratch.file(
        "/execroot/io_bazel/test/test.bzl",
        "def check_function(foo):",
        "  \"\"\"Runs some checks input file with no module docstring.",
        " ",
        "  Args:",
        "  foo: A parameter.",
        "  \"\"\"",
        "pass");
    ImmutableMap.Builder<Label, String> moduleDocMap = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:test.bzl"),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        moduleDocMap);
    Map<Label, String> moduleDocInfo = moduleDocMap.build();
    Label label = Label.parseAbsoluteUnchecked("//test:test.bzl");

    ModuleInfo moduleInfo =
        new ProtoRenderer().setModuleDocstring(moduleDocInfo.get(label)).getModuleInfo().build();
    String moduleDoc = moduleInfo.getModuleDocstring();
    assertThat(moduleDoc).isEmpty();
  }

  @Test
  public void testMultipleLineModuleDoc() throws Exception {
    scratch.file(
        "/execroot/io_bazel/test/test.bzl",
        "\"\"\"Input file to test",
        "multiple lines module docstring\"\"\"",
        "def check_function(foo):",
        "  \"\"\"Runs some checks on the given function parameter.",
        "  ",
        "  Args:",
        "  foo: A unique parameter for this rule.",
        "  \"\"\"",
        "pass");
    ImmutableMap.Builder<Label, String> moduleDocMap = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:test.bzl"),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        moduleDocMap);
    Map<Label, String> moduleDocInfo = moduleDocMap.build();
    Label label = Label.parseAbsoluteUnchecked("//test:test.bzl");

    ModuleInfo moduleInfo =
        new ProtoRenderer().setModuleDocstring(moduleDocInfo.get(label)).getModuleInfo().build();
    String moduleDoc = moduleInfo.getModuleDocstring();
    assertThat(moduleDoc).isEqualTo("Input file to test\nmultiple lines module docstring");
  }

  @Test
  public void testModuleDocAcrossFiles() throws Exception {
    scratch.file(
        "/execroot/io_bazel/test/othertest.bzl", //
        "\"\"\"Should be displayed.\"\"\"",
        "load(':test.bzl', 'check_function')",
        "pass");
    scratch.file(
        "/execroot/io_bazel/test/test.bzl", //
        "\"\"\"Should not be displayed.\"\"\"",
        "def check_function():",
        "  pass");
    ImmutableMap.Builder<Label, String> moduleDocMap = ImmutableMap.builder();

    skydocMain.eval(
        StarlarkSemantics.DEFAULT,
        Label.parseAbsoluteUnchecked("//test:othertest.bzl"),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        ImmutableMap.builder(),
        moduleDocMap);
    Map<Label, String> moduleDocInfo = moduleDocMap.build();
    Label otherlabel = Label.parseAbsoluteUnchecked("//test:othertest.bzl");

    ModuleInfo moduleInfo =
        new ProtoRenderer()
            .setModuleDocstring(moduleDocInfo.get(otherlabel))
            .getModuleInfo()
            .build();
    String moduleDoc = moduleInfo.getModuleDocstring();
    assertThat(moduleDoc).isEqualTo("Should be displayed.");
  }
}