getFileSystemOperations().sync(new Action<CopySpec>() {
            @Override
            public void execute(CopySpec copySpec) {
                copySpec.from(bundleFile, new Action<CopySpec>() {
                    @Override
                    public void execute(CopySpec copySpec) {
                        copySpec.into("Contents/MacOS");
                    }
                });

     * @return The newly created {@code CopySpec}.
     */
    public CopySpec webInf(@SuppressWarnings("rawtypes") @DelegatesTo(CopySpec.class) Closure configureClosure) {
        return ConfigureUtil.configure(configureClosure, getWebInf());
    }

    /**
     * Adds some content to the {@code WEB-INF} directory for this WAR archive.
     *
     * <p>The given action is executed to configure a {@link CopySpec}.
     *

     * @return The created {@code CopySpec}
     */
    public CopySpec metaInf(@DelegatesTo(CopySpec.class) Closure<?> configureClosure) {
        return ConfigureUtil.configure(configureClosure, getMetaInf());
    }

    /**
     * Adds content to this JAR archive's META-INF directory.
     *
     * <p>The given action is executed to configure a {@code CopySpec}.</p>
     *
     * @param configureAction The action.

            JvmFeatureInternal mainFeature = JavaPluginHelper.getJavaComponent(project).getMainFeature();
            CopySpec childSpec = project.copySpec();
            childSpec.from(mainFeature.getJarTask());
            childSpec.from(project.file("src/dist"));

            CopySpec libSpec = project.copySpec();
            libSpec.into("lib");
            libSpec.from(mainFeature.getRuntimeClasspathConfiguration());

     */
    @Suppress("unused")
    fun copySpec(): CopySpec =
        fileOperations.copySpec()

    /**
     * Creates a {@link CopySpec} which can later be used to copy files or create an archive.
     *
     * @param configuration The block to use to configure the [CopySpec].
     * @return The configured [CopySpec]
     */
    @Suppress("unused")

    def "test War"() {
        expect:
        war.archiveExtension.get() == War.WAR_EXTENSION
    }

    def "can configure WEB-INF CopySpec using an Action"() {
        given:
        war.webInf({ CopySpec spec ->
            spec.from temporaryFolder.createFile('file.txt')
        } as Action<CopySpec>)

        when:
        execute(war)

        then:

    override fun uri(path: Any): URI =
        delegate.uri(path)

    override fun copySpec(closure: Closure<*>): CopySpec =
        delegate.copySpec(closure)

    override fun copySpec(action: Action<in CopySpec>): CopySpec =
        delegate.copySpec(action)

    override fun copySpec(): CopySpec =
        delegate.copySpec()

    override fun relativePath(path: Any): String =
        delegate.relativePath(path)

     * into the "{@code lib}" directory.
     */
    public abstract CopySpec getApplicationDistribution();

    public abstract void setApplicationDistribution(CopySpec applicationDistribution);

    public abstract Project getProject();

     * copy the application start scripts into the "{@code bin}" directory, and copy the built jar and its dependencies
     * into the "{@code lib}" directory.
     */
    CopySpec getApplicationDistribution();

    void setApplicationDistribution(CopySpec applicationDistribution);

    }

    @Test
    fun `CopySpec#filter works with a null return value in script`() {
        withBuildScript("""
            fun eliminateEverything(spec: CopySpec) {
                spec.filter { null }
            }
        """)
        build("help")
    }

    @Test
    fun `CopySpec#filter works with a null return value in a kotlin-dsl project`() {