}

    @Nullable
    private File findExecutableInJavaHome(String command) {
        File executable = commandLocation(command);
        if (executable.isFile()) {
            return executable;
        }
        return null;
    }

    private File commandLocation(String command) {
        File exec = new File(getJavaHome(), "bin/" + command);
        return new File(os.getExecutableName(exec.getAbsolutePath()));

        ClassPath nonTransformed = DefaultClassPath.of(file("2.jar"))

        when:
        def combined = transformed + nonTransformed

        then:
        combined.asFiles == [file("1.jar"), file("2.jar")]
        combined.asTransformedFiles == [file("t1.jar"), file("2.jar")]

        combined.findTransformedEntryFor(file("1.jar")) == file("t1.jar")
        combined.findTransformedEntryFor(file("2.jar")) == null
    }

        file("build/classes/java/main/example/io/example/Example.class").exists()
        file("build/classes/java/main/another/module-info.class").exists()
        file("build/classes/java/main/another/io/another/BaseExample.class").exists()
        !file("build/classes/java/main/ignored/module-info.class").exists()
        !file("build/classes/java/main/ignored/io/ignored/IgnoredExample.class").exists()
    }

    }

    private Set<File> existing(Set<File> files) {
        return Sets.filter(files, new Predicate<File>() {
            @Override
            public boolean apply(File file) {
                return file.exists();
            }
        });
    }

    private Set<Path> pathsOf(Set<File> files) {

        try {
            final int maxCount = 50;
            final int numOfThread = 10;

            final File file = File.createTempFile("crawler-", "");
            file.delete();
            file.mkdirs();
            file.deleteOnExit();
            fileTransformer.setPath(file.getAbsolutePath());
            crawler.addUrl(url);
            crawler.crawlerContext.setMaxAccessCount(maxCount);

            outputDir.create {
                file("first-file").text = "leftover file"
                file("second-file").text = "leftover file"
            }
            outputFile.text = "leftover file"
        }

        void createInputs() {
            file("input.txt").text = "input file"
            file("inputs").create {
                file("inputFile1.txt").text = "input 1 in dir"

    @Nullable
    private String fileName() {
        final File file = getFile();
        return file != null ? file.getName() : null;
    }

    public void setExtension(String extension) {
        this.extension = extension;
    }

    /**
     * The extension of the signature artifact.
     *
     * <p>Defaults to the specified file extension of the {@link #getSignatureType() signature type}.</p>
     *

    final outputFile = temporaryFolder.file("output-file")
    final outputDir = temporaryFolder.file("output-dir")
    final outputDirFile = outputDir.file("some-file")
    final outputDirFile2 = outputDir.file("some-file-2")
    final emptyOutputDir = temporaryFolder.file("empty-output-dir")
    final missingOutputFile = temporaryFolder.file("missing-output-file")

        println(message)
    }
}


private
fun Project.findProjectWithBuildFile(file: File) =
    allprojects.find { it.buildFile == file }


private
fun Project.enclosingSourceSetOf(file: File): EnclosingSourceSet? =
    findSourceSetOf(file)
        ?: findSourceSetOfFileIn(subprojects, file)


private
data class EnclosingSourceSet(val project: Project, val sourceSet: SourceSet)

        then:
        builder.build() == defaultOptions + ['--release', '7']
    }

    def "generates -d option"() {
        def file = new File("/project/build")
        spec.destinationDir = file

        expect:
        builder.build() == ["-d", file.path] + defaultOptions
    }

    def "generates -verbose option"() {
        when:
        spec.compileOptions.verbose = true

        then: