return Collections.emptySet();
        }
        return javaSourceSets.getByName(SourceSet.MAIN_SOURCE_SET_NAME)
            .getOutput()
            .getClassesDirs()
            .getAsFileTree()
            .getFiles()
            .stream()
            .filter(file -> file.getName().endsWith(".class"))
            .map(File::getName)
            .map(name -> name.substring(0, name.length() - 6))

    public DirectoryProperty getOutputDirectory() {
        return outputDirectory;
    }

    @SkipWhenEmpty
    @InputFiles
    public FileTree getTestFiles() {
        return sourceDirectory.getAsFileTree().matching(testPatternSet);
    }

    @TaskAction
    public void transform() throws IOException {
        // clean the output directory to ensure no stale files persist