InputFileChanges nonIncrementalChanges(ImmutableSortedMap<String, FileCollectionFingerprint> previous, ImmutableSortedMap<String, CurrentFileCollectionFingerprint> current);
    InputFileChanges incrementalChanges(ImmutableSortedMap<String, FileCollectionFingerprint> previous, ImmutableSortedMap<String, CurrentFileCollectionFingerprint> current);

    IncrementalInputProperties NONE = new IncrementalInputProperties() {
        @Override

        final alternateGreeter = new CppAlternateHeaderGreeterFunction().asLib()

        final String moduleName = "cppGreeter"
        final List<IncrementalElement.Transform> incrementalChanges = [modify(greeter, alternateGreeter)]
    }

    class IncrementalSwiftAppWithCppDep extends IncrementalSwiftApp {
        final SwiftMainWithCppDep main
        final SwiftMainWithCppDep alternateMain

    final greeter = new SwiftGreeter()
    final sum = new SwiftSum()
    final multiply = new SwiftMultiply()

    final List<IncrementalElement.Transform> incrementalChanges = [
        preserve(greeter),
        rename(sum),
        delete(multiply)
    ]
    final String moduleName = "Hello"

    private final sum = new SwiftSum()
    private final multiply = new SwiftMultiply()
    private final main = new SwiftMain(greeter, sum)

    final List<IncrementalElement.Transform> incrementalChanges = [
        preserve(greeter),
        rename(sum),
        delete(multiply),
        preserve(main)
    ]
    final String expectedOutput = main.expectedOutput

        ]
    }

    List<XCTestSourceFileElement> testSuites = [fooTestSuite, barTestSuite]
    List<XCTestSourceFileElement> alternateTestSuites = [alternateFooTestSuite]

    List<IncrementalElement.Transform> incrementalChanges = [
        modify(fooTestSuite, alternateFooTestSuite),
        delete(barTestSuite),
        preserve(new SourceElement() {
            List<SourceFile> files = [barTestSuite.emptyInfoPlist()]
        })
    ]

 */
class IncrementalSwiftStaleLinkOutputLib extends IncrementalSwiftElement {
    private final greeter = new SwiftGreeter()
    private final sum = new SwiftSum()

    final List<IncrementalElement.Transform> incrementalChanges = [
        delete(greeter), delete(sum)]
    final String moduleName = "Greeter"

    private final greeter = new CppGreeter()
    private final sum = new CppSum()
    private final main = new CppMain(greeter, sum)

    final List<IncrementalElement.Transform> incrementalChanges = [
        delete(greeter), delete(sum), delete(main)]
    final String expectedOutput = main.expectedOutput

    private final sum = new CppSum()
    private final multiply = new CppMultiply()
    private final main = new CppMain(greeter, sum)

    final List<IncrementalElement.Transform> incrementalChanges = [
        preserve(greeter),
        rename(sum),
        delete(multiply),
        preserve(main)
    ]
    final String expectedOutput = main.expectedOutput

        ]
    }

    List<XCTestSourceFileElement> testSuites = [fooTestSuite]
    List<XCTestSourceFileElement> alternateTestSuites = [alternateFooTestSuite, barTestSuite]

    List<IncrementalElement.Transform> incrementalChanges = [
        modify(fooTestSuite, alternateFooTestSuite),
        add(barTestSuite),
        preserve(new SourceElement() {
            List<SourceFile> files = [barTestSuite.emptyInfoPlist()]
        })
    ]

        return lib
    }

    class IncrementalCppLib extends IncrementalCppElement {
        final greeter = new CppGreeter()
        final sum = new CppSum()

        final List<IncrementalElement.Transform> incrementalChanges = [preserve(greeter.asLib()), preserve(sum.asLib())]
    }

    class IncrementalCppAppWithDep extends IncrementalCppElement implements AppElement {
        final CppMain main