*
   * <p>This differs from {@code Long.bitCount(x) == 1}, because {@code
   * Long.bitCount(Long.MIN_VALUE) == 1}, but {@link Long#MIN_VALUE} is not a power of two.
   */
  // Whenever both tests are cheap and functional, it's faster to use &, | instead of &&, ||
  @SuppressWarnings("ShortCircuitBoolean")
  public static boolean isPowerOfTwo(long x) {
    return x > 0 & (x & (x - 1)) == 0;
  }

  /**

   *
   * <p>This differs from {@code Long.bitCount(x) == 1}, because {@code
   * Long.bitCount(Long.MIN_VALUE) == 1}, but {@link Long#MIN_VALUE} is not a power of two.
   */
  // Whenever both tests are cheap and functional, it's faster to use &, | instead of &&, ||
  @SuppressWarnings("ShortCircuitBoolean")
  public static boolean isPowerOfTwo(long x) {
    return x > 0 & (x & (x - 1)) == 0;
  }

  /**

    QUICK_FEEDBACK_LINUX_ONLY("Quick Feedback - Linux Only", "Run checks and functional tests (embedded executer, Linux)", "QuickFeedbackLinuxOnly"),
    QUICK_FEEDBACK("Quick Feedback", "Run checks and functional tests (embedded executer, Windows)", "QuickFeedback"),
    PULL_REQUEST_FEEDBACK("Pull Request Feedback", "Run various functional tests", "PullRequestFeedback"),

### Features and components

The operator has a very similar structure to istio/installer: components are grouped into features.
`IstioOperatorSpec` defines functional settings at the feature level. Functional settings are those that performs some
function in the Istio control plane without necessarily being tied to any one component that runs in a Deployment.

  // Add a function (serialized FunctionDef protocol buffer) so that it can
  // be executed as an op. Return error if the function with the same name
  // already exists.
  virtual absl::Status AddFunctionDef(const FunctionDef& fdef) = 0;

  // Notifies about the function removal.
  virtual absl::Status AddRemoveFunctionNotifier(
      const string& func, std::function<void()> notifier) = 0;

        }

        assertFalse(projectFoldersWithFunctionalTests.isEmpty())
        projectFoldersWithFunctionalTests.forEach {
            assertTrue(projectDirsWithFunctionalTests.contains(it), "Contains functional tests: $it")
        }
    }

    @Test
    fun allSubprojectsDefineTheirCrossVersionTestPropertyCorrectly() {
        val projectDirsWithCrossVersionTests = model.subprojects.subprojects

    "path": "platforms/core-configuration/flow-services",
    "unitTests": false,
    "functionalTests": true,
    "crossVersionTests": false
  },
  {
    "name": "functional",
    "path": "platforms/core-runtime/functional",
    "unitTests": true,
    "functionalTests": false,
    "crossVersionTests": false
  },
  {
    "name": "gradle-cli",
    "path": "platforms/core-runtime/gradle-cli",

platforms/core-runtime/build-operations/                    @gradle/bt-core-runtime-maintainers @gradle/bt-execution @gradle/dv-integrations-team
platforms/core-runtime/functional/                          @gradle/bt-core-runtime-maintainers @gradle/bt-execution @bamboo
platforms/core-runtime/files/                               @gradle/bt-core-runtime-maintainers @gradle/bt-execution @gradle/dv-integrations-team

    CacheBuilder<Object, Object> builder = CacheBuilder.from(parse("maximumSize=9000"));
    builder.build(CacheLoader.from(Suppliers.ofInstance(null)));
  }

  public void testDisableCaching() {
    // Functional test: assert that CacheBuilderSpec.disableCaching()
    // disables caching.  It's irrelevant how it does so.
    CacheBuilder<Object, Object> builder = CacheBuilder.from(CacheBuilderSpec.disableCaching());

      extends AbstractTransformFuture<I, O, Function<? super I, ? extends O>, O> {
    TransformFuture(
        ListenableFuture<? extends I> inputFuture, Function<? super I, ? extends O> function) {
      super(inputFuture, function);
    }

    @Override
    @ParametricNullness
    O doTransform(Function<? super I, ? extends O> function, @ParametricNullness I input) {
      return function.apply(input);
    }

    @Override