public final String task = 'greet'
    public final TestFile projectDir
    public final Language language
    public final Kind kind
    public final TestFile buildFile

    BuildLogicChangeFixture(TestFile projectDir, Language language = Language.JAVA, Kind kind = Kind.CHANGE_SOURCE) {
        this.projectDir = projectDir
        this.language = language
        this.kind = kind

        BUILDSRC_SETTINGS,
    }

    final TestFile projectDir
    final TestFile scriptFile
    final List<String> buildArguments
    final String expectedOutputBeforeChange = 'Hello!'
    final String expectedOutputAfterChange = 'Hi!'

    ScriptChangeFixture(TestFile projectDir, TestFile scriptFile, List<String> buildArguments) {
        this.projectDir = projectDir
        this.scriptFile = scriptFile

        assert rootProject.projectDir == testDirectory.absolutePath
        assert rootProject.buildFile == buildFile.absolutePath
        assert rootProject.children.size() == 3 // All projects are created when storing
        with(rootProject.children.first() as Map<String, Object>) {
            assert name == 'a'
            assert path == ':a'
            assert projectDir == file('a').absolutePath

internal
sealed class CachedProjectState(
    val path: Path,
    val projectDir: File,
    val buildFile: File
)


internal
class ProjectWithWork(
    path: Path,
    projectDir: File,
    buildFile: File,
    val buildDir: File,
    val normalizationState: InputNormalizationHandlerInternal.CachedState?
) : CachedProjectState(path, projectDir, buildFile)


internal
class ProjectWithNoWork(
    path: Path,

        given:
        buildFile("""
            println("exists = " + new File(projectDir, "file1.txt").exists())
            println("exists = " + new File(projectDir, "file2.txt").exists())
            println("exists = " + new File(projectDir, "file3.txt").exists())
        """)

        when:
        file("gradle.properties") << """

            // the relative directory information must be part of the key.
            val projectDir = startParameter.projectDirectory
            if (projectDir != null) {
                relativePathOf(
                    projectDir,
                    startParameter.rootDirectory
                ).let { relativeProjectDir ->
                    putString(relativeProjectDir)

     *
     * @param projectDir The project directory. May be null.
     */
    public void setProjectDir(@Nullable File projectDir) {
        if (projectDir == null) {
            setCurrentDir(null);
            this.projectDir = null;
        } else {
            File canonicalFile = FileUtils.canonicalize(projectDir);
            currentDir = canonicalFile;

        """

        // Load the StaticData class in the different sub-sub-projects
        // for a more interesting ClassLoader hierarchy.
        for (projectDir in ['foo/foo', 'bar/bar']) {
            file("$projectDir/build.gradle") << """
                buildscript { dependencies { classpath(files('${staticDataLib.toURI()}')) } }

                task ok(type: StaticData) {
                }

        override fun registerRootProject(rootProjectName: String, projectDir: File, buildDir: File) {
            // Root project is registered when the settings are created, just need to adjust its properties
            val descriptor = rootProjectDescriptor()
            descriptor.name = rootProjectName
            descriptor.projectDir = projectDir
            buildDirs[Path.ROOT] = buildDir
        }

        new BuildTestFixture(projectDir).withBuildInRootDir().singleProjectBuild(projectName, cl)
    }

    BuildTestFile singleProjectBuildInSubDir(String projectName, @DelegatesTo(BuildTestFile) Closure cl = {}) {
        new BuildTestFixture(projectDir).withBuildInSubDir().singleProjectBuild(projectName, cl)
    }