public interface ArtifactBuilder {
    TestFile sourceFile(String path);

    TestFile resourceFile(String path);

    void manifestAttributes(Map<String, String> attributes);

    void preserveTimestamps(boolean preserveTimestamps);

    void buildJar(File jarFile);

        manifestAttributes.putAll(attributes);
    }

    @Override
    public void preserveTimestamps(boolean preserveTimestamps) {
        if (isGradleExecuterVersionLessThan("3.4")) {
            throw new IllegalArgumentException("Cannot set up timestamps on Gradle before 3.4");
        }
        shouldPreserveTimestamps = preserveTimestamps;
    }

    @Override
    public void buildJar(File jarFile) {

        def currentTimestampJar = file("current/testClasses.jar")
        artifactBuilder().tap {
            preserveTimestamps(false)
            sourceFile("org/gradle/test/BuildClass.java").text = buildClassSource
            buildJar(reproducibleJar)
        }
        artifactBuilder().tap {
            preserveTimestamps(true)
            sourceFile("org/gradle/test/BuildClass.java").text = buildClassSource