import static org.gradle.internal.hash.Hashing.sha256

@CleanupTestDirectory
class InstallTest extends Specification {
    public static final String FETCHED_HASH = "fetchedHash"
    WrapperConfiguration configuration = new WrapperConfiguration()

    private final String zipFileName = 'gradle-0.9.zip';

    File testDir
    TestFile distributionDir
    TestFile gradleHomeDir
    File zipStore
    TestFile zipDestination

        Logger logger = logger(options);

        WrapperExecutor wrapperExecutor = WrapperExecutor.forWrapperPropertiesFile(propertiesFile);
        WrapperConfiguration configuration = wrapperExecutor.getConfiguration();
        IDownload download = new Download(logger, "gradlew", UNKNOWN_VERSION, configuration.getNetworkTimeout());

        wrapperExecutor.execute(
                args,

Class <org.gradle.wrapper.WrapperConfiguration> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (WrapperConfiguration.java:0)