def zipFile = file('library.jar')
        file('zipContents').create {
            file('firstFile.txt').text = "Some text"
            file('secondFile.txt').text = "Second File"
            subdir {
                file('someOtherFile.log').text = "File in subdir"
            }
        }.zipTo(zipFile)
        def classes = file('classes').create {
            file('thirdFile.txt').text = "Third file"

        def file = temporaryFolder.file("build/output-files/file.txt")
        FileSystemSnapshot dirSnapshot
        FileSystemSnapshot fileSnapshot

        void snapshot() {
            dirSnapshot = snapshot(dir)
            fileSnapshot = snapshot(file)
        }

        void createContents() {
            file.text = "output file"

        def file = new File("thing.txt")
        def cache = factory.newCache("cache", 12000, calculator, BaseSerializerFactory.INTEGER_SERIALIZER)

        when:
        def result = cache.get(file)

        then:
        result == 12

        and:
        interaction {
            snapshotRegularFile(file)
        }
        1 * calculator.calculate(file, true) >> 12
        0 * _

        byte[] getBytes()
        void setBytes(byte[] bytes)
        void copyBytesTo(TestFile file)
    }

    private class TestFileCacheEntry implements TestCacheEntry {

        String key
        TestFile file

        TestFileCacheEntry(String key, TestFile file) {
            this.key = key
            this.file = file
        }

        @Override
        String getKey() {
            return key

        for (File file : classPath) {
            String name = file.getName();
            if (name.startsWith("kotlin-stdlib-") || name.startsWith("kotlin-reflect-")) {
                files.add(file);
            }
        }
        return files;
    }

    private Set<File> gradleTestKitFileCollection(Collection<File> testKitClasspath) {

    private final File daemonBaseDir;
    private final boolean verboseLogging;
    private final File distributionBaseDir;

    public static Builder builder() {
        return new Builder();
    }

    public static class Builder {
        private File projectDir;
        private File gradleUserHomeDir;
        private Boolean embedded;
        private Integer daemonMaxIdleTimeValue;

    def system = Mock(DefaultLocalMavenRepositoryLocator.SystemPropertyAccess)
    def mavenFileLocations = Mock(MavenFileLocations)

    File repo1 = tmpDir.file("repo1")
    File repo2 = tmpDir.file("repo2")
    File userHome1 = tmpDir.file("user_home_1")
    File defaultM2Repo = new File(userHome1, ".m2/repository")

    def setup() {
        locations = new SimpleMavenFileLocations()

    TestFile missingFile

    def setup() {
        jarFile1 = file("dir/libs/library-a.jar")
        jarFile1 << "JAR file #1"
        jarFile2 = file("dir/libs/library-b.jar")
        jarFile2 << "JAR file #2"
        resources = file("dir/resources")
        resources.file("input.txt") << "main input"
        resources.file("a/input-1.txt") << "input #1"
        resources.file("b/input-2.txt") << "input #2"
        emptyRootDir = file("empty-dir")

        given:
        settingsFile << "include 'child'"
        file('child/build.gradle') << javaProjectUsingCheckstyle()
        file('child/src/main/java/Dummy.java') << javaClassWithNewLineAtEnd()
        file('child/config/checkstyle/checkstyle.xml') << simpleCheckStyleConfig()

        expect:
        fails(':child:checkstyleMain')
        checkStyleReportFile(file('child')).assertDoesNotExist()
    }

        then:
        file.length() == 5
        file.seek(0)
        file.readInt() == 123
        file.readByte() == 12

        when:
        stream = output.start(0)
        stream.writeInt(321)
        output.done()

        then:
        file.length() == 5
        file.seek(0)
        file.readInt() == 321
        file.readByte() == 12
    }

    def "can start writing beyond end of file"() {
        when: