*       {@code cls}, instance methods are skipped for nulls test.
   *   <li>Nulls test is not performed on method return values unless the method is a non-private
   *       static factory method whose return type is {@code cls} or {@code cls}'s subtype.
   * </ul>
   */
  public void testNulls(Class<?> cls) {
    try {
      doTestNulls(cls, Visibility.PACKAGE);
    } catch (Exception e) {

        private void traverseObjectWithParents(Class<?> cls, Object target) throws ModelInterpolationException {
            if (cls == null) {
                return;
            }

            if (cls.isArray()) {
                evaluateArray(target);
            } else if (isQualifiedForInterpolation(cls)) {
                Field[] fields = FIELDS_BY_CLASS.computeIfAbsent(cls, k -> cls.getDeclaredFields());

    TreeMap<String, Class<?>> classMap = Maps.newTreeMap();
    for (Class<?> cls : classes) {
      classMap.put(cls.getName(), cls);
    }
    // Foo.class -> [FooTest.class, FooTests.class, FooTestSuite.class, ...]
    Multimap<Class<?>, Class<?>> testClasses = HashMultimap.create();
    LinkedHashSet<Class<?>> candidateClasses = Sets.newLinkedHashSet();
    for (Class<?> cls : classes) {

    TreeMap<String, Class<?>> classMap = Maps.newTreeMap();
    for (Class<?> cls : classes) {
      classMap.put(cls.getName(), cls);
    }
    // Foo.class -> [FooTest.class, FooTests.class, FooTestSuite.class, ...]
    Multimap<Class<?>, Class<?>> testClasses = HashMultimap.create();
    LinkedHashSet<Class<?>> candidateClasses = Sets.newLinkedHashSet();
    for (Class<?> cls : classes) {

      Iterable<ClassPath.ClassInfo> classes, Class<?> cls) {
    for (ClassPath.ClassInfo classInfo : classes) {
      if (classInfo.getName().equals(cls.getName())) {
        return classInfo;
      }
    }
    throw new AssertionError("failed to find " + cls);
  }

  private static ResourceInfo resourceInfo(Class<?> cls) {
    String resource = cls.getName().replace('.', '/') + ".class";

      Iterable<ClassPath.ClassInfo> classes, Class<?> cls) {
    for (ClassPath.ClassInfo classInfo : classes) {
      if (classInfo.getName().equals(cls.getName())) {
        return classInfo;
      }
    }
    throw new AssertionError("failed to find " + cls);
  }

  private static ResourceInfo resourceInfo(Class<?> cls) {
    String resource = cls.getName().replace('.', '/') + ".class";

  }

  private static void disallowPrimitiveType(Type[] types, String usedAs) {
    for (Type type : types) {
      if (type instanceof Class) {
        Class<?> cls = (Class<?>) type;
        checkArgument(!cls.isPrimitive(), "Primitive type '%s' used as %s", cls, usedAs);
      }
    }
  }

  /** Returns the {@code Class} object of arrays with {@code componentType}. */

except ImportError:  # pragma: no cover

    class EmailStr(str):  # type: ignore
        @classmethod
        def __get_validators__(cls) -> Iterable[Callable[..., Any]]:
            yield cls.validate

        @classmethod
        def validate(cls, v: Any) -> str:
            logger.warning(
                "email-validator not installed, email fields will be treated as str.\n"

    final Iterable<Method> getStaticMethods(Class<?> cls) {
      ImmutableList.Builder<Method> builder = ImmutableList.builder();
      for (Method method : getVisibleMethods(cls)) {
        if (Invokable.from(method).isStatic()) {
          builder.add(method);
        }
      }
      return builder.build();
    }

    final Iterable<Method> getInstanceMethods(Class<?> cls) {

    final Iterable<Method> getStaticMethods(Class<?> cls) {
      ImmutableList.Builder<Method> builder = ImmutableList.builder();
      for (Method method : getVisibleMethods(cls)) {
        if (Invokable.from(method).isStatic()) {
          builder.add(method);
        }
      }
      return builder.build();
    }

    final Iterable<Method> getInstanceMethods(Class<?> cls) {