tarTree instanceof FileTreeAdapter
        tarTree.tree instanceof TarFileTree
    }

    def copiesFiles() {
        def fileCollection = Mock(ConfigurableFileCollection)
        def fileTree = Mock(FileTreeInternal)
        fileCollectionFactory.configurableFiles() >> fileCollection
        fileCollection.asFileTree >> fileTree
        fileTree.matching(_) >> fileTree
        resolver.resolve('dir') >> tmpDir.getTestDirectory()

            elements.addAll(contents)
        }

        override fun visitFileTree(root: File, patterns: PatternSet, fileTree: FileTreeInternal) {
            elements.add(directoryFileTreeFactory.create(root, patterns))
        }

        override fun visitFileTreeBackedByFile(file: File, fileTree: FileTreeInternal, sourceTree: FileSystemMirroringFileTree) {
            elements.add(file)
        }

        }

        @Override
        public FileTree getAllSource() {
            final ImmutableList.Builder<FileTreeInternal> builder = ImmutableList.builder();
            walk(copySpecResolver -> builder.add(Cast.<FileTreeInternal>uncheckedCast(copySpecResolver.getSource())));
            return fileCollectionFactory.treeOf(builder.build());
        }

        @Override

import org.gradle.api.internal.artifacts.configurations.RoleBasedConfigurationContainerInternal;
import org.gradle.api.internal.artifacts.configurations.UsageDescriber;
import org.gradle.api.internal.file.FileTreeInternal;
import org.gradle.api.internal.plugins.DslObject;
import org.gradle.api.internal.tasks.DefaultSourceSetOutput;
import org.gradle.api.internal.tasks.JvmConstants;