}

            task unpackJar(type: Copy) {
                from zipTree(jar.archiveFile)
                into 'build/unzippedJar'
            }
        """
        file("src/main/java/Hello.java") << """public class Hello {}"""

        when:
        run 'unpackJar'

        then:
        executedAndNotSkipped ':jar', ':unpackJar'
    }

        outputFile.exists()
        outputFile.unzipTo(unpackDir)
        unpackDir.file("README").text == "README"
        unpackDir.file("subdir/A").text == "A"

        when:
        subDir.file("B").text = "B"

        then:
        buildTriggeredAndSucceeded()
        executedAndNotSkipped(":zip")
        outputFile.exists()
        outputFile.unzipTo(unpackDir)
        unpackDir.file("subdir/B").text == "B"

        when:

                handler
            );
        }

        private void walkNestedChild(Supplier<Object> unpacker, String qualifiedName, PropertyMetadata propertyMetadata, InstanceMetadataVisitor visitor, boolean isElementOfCollection, Consumer<Object> handler) {
            Object value;
            try {
                value = unpacker.get();
            } catch (Exception ex) {
                visitor.visitNestedUnpackingError(qualifiedName, ex);

    def originMetadata = Mock(OriginMetadata)
    def originReader = Mock(OriginReader)
    def originWriter = Mock(OriginWriter)

    def "unpack invokes unpacker and fingerprints trees"() {
        def outputFile = temporaryFolder.file("output.txt")
        def outputDir = temporaryFolder.file("outputDir")
        def outputDirFile = outputDir.file("file.txt")