*
     * @return An expression that can be used to refer to the task later.
     */
    public TaskRegistration taskRegistration(@Nullable String comment, String taskName, String taskType, Action<? super ScriptBlockBuilder> blockContentsBuilder) {
        TaskRegistration registration = new TaskRegistration(comment, taskName, taskType);
        block.add(registration);
        blockContentsBuilder.execute(registration.body);

            buildScriptBuilder.methodInvocation(null, functionalTestRuntimeOnly, "extendsFrom", testRuntimeOnly);

            BuildScriptBuilder.Expression functionalTest = buildScriptBuilder.taskRegistration("Add a task to run the functional tests", "functionalTest", "Test", b -> {
                b.propertyAssignment(null, "testClassesDirs", buildScriptBuilder.propertyExpression(functionalTestSourceSet, "output.classesDirs"), true);

    implementation project(':p2')
    testImplementation project(':p1')
}
""")
    }

    def "can register tasks and refer to them later"() {
        given:
        def task = builder.taskRegistration("Compile stuff", "compile", "JavaCompile") { t ->
            t.propertyAssignment(null, "classpath", 12, true)
        }
        builder.block("Use stuff", "artifacts") { b ->

    boolean packageTests(MavenProject project, BuildScriptBuilder builder) {
        Plugin jarPlugin = plugin("maven-jar-plugin", project);
        if (pluginGoal("test-jar", jarPlugin) != null) {
            builder.taskRegistration(null, "testsJar", "Jar", task -> {
                task.propertyAssignment(null, "archiveClassifier", "tests", true);