static final String TEST_PATTERN_1 = 'pattern1'
    static final String TEST_PATTERN_2 = 'pattern2'
    static final String TEST_PATTERN_3 = 'pattern3'

    abstract PatternFilterable getPatternSet()

    def testDefaultValues() {
        expect:
        patternSet.includes.empty
        patternSet.excludes.empty
    }

    def testInclude() {
        expect:

    }

    @Inject
    protected Factory<PatternSet> getPatternSetFactory() {
        throw new UnsupportedOperationException();
    }

    @Internal
    protected PatternFilterable getPatternSet() {
        return patternSet;
    }

    /**
     * Returns the source for this task, after the include and exclude patterns have been applied. Ignores source files which do not exist.
     *
     * <p>

    public DirectoryFileTree postfix() {
        if (postfix) {
            return this;
        }
        return new DirectoryFileTree(dir, patternSet, fileSystem, true);
    }

    public PatternSet getPatternSet() {
        return patternSet;
    }

     */
    @InputFiles
    @IgnoreEmptyDirectories
    @PathSensitive(PathSensitivity.RELATIVE)
    protected FileTree getFilteredCompilationOutputs() {
        return getCompilationOutputs().getAsFileTree().matching(getPatternSet()).matching(pattern -> pattern.include("**/*.tasty"));
    }

    /**
     * Returns the compilation outputs produced by the sources that are generating Scaladoc.
     *

    File testDir = tmpDir.testDirectory
    FileResolver fileResolverStub = resolver(testDir)
    FileCollectionObservationListener listener = Mock()

    PatternFilterable getPatternSet() {
        return fileTree
    }

    void setup() {
        fileTree = new DefaultConfigurableFileTree(fileResolverStub, listener, TestFiles.patternSetFactory, taskDependencyFactory, directoryFileTreeFactory())

            return RelativePath.parse(false, parentPath, path);
        }

        @Override
        public FileTree getSource() {
            return getSourceRootsForThisSpec().getAsFileTree().matching(this.getPatternSet());
        }

        @Override
        public FileTree getAllSource() {
            final ImmutableList.Builder<FileTreeInternal> builder = ImmutableList.builder();