when:
        visitor.stopOn = rootFile2
        fileTree.visit(visitor)

        then:
        visitor.visited == [rootFile1, rootFile2]

        when:
        visitor = new TestVisitor(true)
        visitor.stopOn = dirFile1
        fileTree.visit(visitor)

        then:
        visitor.visited == [rootFile1, rootFile2, dir1, dirFile1]

        where:

import okhttp3.HttpUrl.Companion.toHttpUrl
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.RequestBody.Companion.asRequestBody

class PostFile {
  private val client = OkHttpClient()

  fun run() {
    val file = File("README.md")

    val request =
      Request(
        url = "https://api.github.com/markdown/raw".toHttpUrl(),

    def "filters correctly"() {
        given:
        def root = temporaryFolder.createDir("root")
        root.createFile("rootFile1")
        def dir1 = root.createDir("dir1")
        def dirFile1 = dir1.createFile("dirFile1")
        def dirFile2 = dir1.createFile("dirFile2")
        def rootFile2 = root.createFile("rootFile2")
        def subdir = dir1.createDir("subdir")
        def subdirFile1 = subdir.createFile("subdirFile1")

        def rootFile1 = file("root1.txt") << "root1"
        def rootDir = file("dir").createDir()
        rootDir.file("file1.txt") << "file1"
        rootDir.file("file2.txt") << "file2"
        def rootFile2 = file("root2.txt") << "root2"

        when:
        def fileCollectionFingerprint = fingerprint(rootFile1, rootDir, rootFile2)

        then:
        fileCollectionFingerprint == [

    def noOptDestDir = compileWithoutOptimization.destinationDirectory
    doLast {
        def optFile = optDestDir.file("MethodInvocations.class").get().asFile
        def noOptFile = noOptDestDir.file("MethodInvocations.class").get().asFile
        assert optFile.size() != noOptFile.size()
    }

    private final Map<FileCollectionDependency, Integer> rootFiles;

    public DefaultVisitedFileDependencyResults(Map<FileCollectionDependency, Integer> rootFiles) {
        this.rootFiles = rootFiles;
    }

    @Override
    public Map<FileCollectionDependency, Integer> getFirstLevelFiles() {
        return rootFiles;
    }

    private final Map<FileCollectionDependency, Integer> rootFiles = new LinkedHashMap<>();

    @Override
    public void visitArtifacts(DependencyGraphNode node, LocalFileDependencyMetadata fileDependency, int artifactSetId, ArtifactSet artifactSet) {
        if (node.isRoot()) {
            rootFiles.put(fileDependency.getSource(), artifactSetId);
        }
    }

                        .findFirst()
                        .ifPresent(rootFiles::add);
            }
            catch (IOException ignored) {
            }
        }

        Path classesZip = home.resolve("lib/classes.zip");
        if (Files.isRegularFile(classesZip)) {
            rootFiles.add(classesZip);
        }

        if (rootFiles.isEmpty()) {
            Path classesDir = home.resolve("classes");

            task producer(type: InputFileTask) {
                inFile = file("in.txt")
                outFile = layout.buildDirectory.file("out.txt")
            }
            task transformer(type: InputTask) {
                inValue = producer.outFile.map { f -> f.asFile.text as Integer }.map { i -> i + 2 }
                outFile = file("out.txt")
            }
        """
        def input = file("in.txt")

		t.Error("compilation with -lang=go1.8 succeeded unexpectedly")
	}

	if err := testLang(t, "go1.9", src, outfile); err != nil {
		t.Errorf("compilation with -lang=go1.9 failed unexpectedly: %v", err)
	}
}

func testLang(t *testing.T, lang, src, outfile string) error {
	run := []string{testenv.GoToolPath(t), "tool", "compile", "-p=p", "-lang", lang, "-o", outfile, src}
	t.Log(run)