public List<Exception> getResolutionErrors(Dependency dependency) {
        List<Exception> errors = resolutionErrors.get(dependency);
        return (errors != null) ? Collections.unmodifiableList(errors) : Collections.emptyList();
    }

    public void setResolutionErrors(Dependency dependency, List<Exception> errors) {
        dependencies.add(dependency);
        unresolvedDependencies.add(dependency);

        Dependency differentType = Mock(Dependency.class)

        expect:
        dependency.contentEquals(dependency)
        dependency.contentEquals(equalDependency)
        !dependency.contentEquals(differentSource)
        !dependency.contentEquals(differentType)
    }

    def usesSourceFileCollectionToDetermineBuildDependencies() {

public class DefaultDependency implements Dependency {

    private final InternalSession session;
    private final org.eclipse.aether.graph.Dependency dependency;
    private final String key;

    public DefaultDependency(
            @Nonnull InternalSession session, @Nonnull org.eclipse.aether.graph.Dependency dependency) {
        this.session = nonNull(session, "session");
        this.dependency = nonNull(dependency, "dependency");

    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-toolchain-model</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-builder-support</artifactId>
    </dependency>
    <dependency>
      <groupId>org.codehaus.plexus</groupId>
      <artifactId>plexus-interpolation</artifactId>
    </dependency>
    <dependency>

    }

    @Override
    public Dependency createDependency(Object dependencyNotation) {
        Dependency dependency;
        if (dependencyNotation instanceof Dependency && !(dependencyNotation instanceof MinimalExternalModuleDependency)) {
            dependency = (Dependency) dependencyNotation;
        } else {
            dependency = dependencyNotationParser.getNotationParser().parseNotation(dependencyNotation);

    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-core</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-model</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-impl</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.maven</groupId>

      </dependency>
      <dependency>
        <groupId>org.apache.maven</groupId>
        <artifactId>maven-api-core</artifactId>
        <version>${project.version}</version>
      </dependency>
      <dependency>
        <groupId>org.apache.maven</groupId>
        <artifactId>maven-api-meta</artifactId>
        <version>${project.version}</version>
      </dependency>
      <dependency>

        then:
        1 * dependency.visitDependencies(_) >> { TaskDependencyResolveContext context -> context.add(target) }
        tasks == [target] as LinkedHashSet
    }

    def resolvesTaskDependency() {
        TaskDependency otherDependency = Mock()

        when:
        def tasks = context.getDependencies(task, dependency)

        then:

    }

    /**
     * Adds a dependency to the script classpath.
     *
     * @param dependency dependency to be added.
     * @param dependencyConfiguration expression to use to configure the dependency.
     * @return The dependency.
     *
     * @see [DependencyHandler.add]
     */
    inline fun <T : ModuleDependency> DependencyHandler.classpath(
        dependency: T,
        dependencyConfiguration: T.() -> Unit

        when:
        dependency.add(input)

        then:
        dependency.getDependencies(task) == toSet(otherTask)
    }

    def "can depend on a task instance"() {
        when:
        dependency.add(otherTask)

        then:
        dependency.getDependencies(task) == toSet(otherTask)
    }

    def "can depend on a task dependency"() {
        def otherDependency = Mock(TaskDependency)