final <T> T isSubtype(T sub) {
    Type returnType = method.getGenericReturnType();
    Type paramType = getOnlyParameterType();
    TestSubtype spec = method.getAnnotation(TestSubtype.class);
    assertWithMessage("%s is subtype of %s", paramType, returnType)
        .that(TypeToken.of(paramType).isSubtypeOf(returnType))
        .isTrue();
    assertWithMessage("%s is supertype of %s", returnType, paramType)

            Objects.equals(returnType, that.returnType);
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), name, ownerClass, parameters, returnType);
    }

    public ClassMetaData getOwnerClass() {
        return ownerClass;
    }

    public TypeMetaData getReturnType() {
        return returnType;
    }

  final <T> T isSubtype(T sub) {
    Type returnType = method.getGenericReturnType();
    Type paramType = getOnlyParameterType();
    TestSubtype spec = method.getAnnotation(TestSubtype.class);
    assertWithMessage("%s is subtype of %s", paramType, returnType)
        .that(TypeToken.of(paramType).isSubtypeOf(returnType))
        .isTrue();
    assertWithMessage("%s is supertype of %s", returnType, paramType)

    ): Any? {
      val callArgs = args ?: arrayOf<Any?>()
      val methodName = method.name
      val returnType = method.returnType
      if (methodName == "supports" && Boolean::class.javaPrimitiveType == returnType) {
        return true // ALPN is supported.
      } else if (methodName == "unsupported" && Void.TYPE == returnType) {
        this.unsupported = true // Peer doesn't support ALPN.
        return null

    def formatsSignature() {
        method.returnType = new TypeMetaData('ReturnType')
        method.addParameter('param1', new TypeMetaData('ParamType'))
        method.addParameter('param2', new TypeMetaData('ParamType2'))

        expect:
        method.signature == 'ReturnType method(ParamType param1, ParamType2 param2)'
        method.overrideSignature == 'method(ParamType, ParamType2)'

        throw new AssertionError("Annotation is missing required method", e);
      }
      final Class<?> returnType = method.getReturnType();
      assertTrue(
          rootLocaleFormat("%s.%s() must return an array.", annotationClass, propertyName),
          returnType.isArray());
      assertSame(
          rootLocaleFormat(
              "%s.%s() must return an array of %s.",

        _ * methodDoc.metaData >> metaData
        _ * methodDoc.deprecated >> (args.deprecated ?: false)
        _ * methodDoc.incubating >> (args.incubating ?: false)
        _ * metaData.returnType >> new TypeMetaData(args.returnType ?: 'ReturnType')
        def paramTypes = args.paramTypes ?: []
        _ * metaData.parameters >> paramTypes.collect {
            def param = new ParameterMetaData("p");

    /** メソッド名 */
    protected final String methodName;

    /** メソッドの引数型の配列 */
    protected final Class<?>[] parameterTypes;

    /** メソッドの戻り値型 */
    protected final Class<?> returnType;

    /** パラメータ化された引数型の情報 */
    protected final ParameterizedClassDesc[] parameterizedClassDescs;

    /** パラメータ化された戻り値型の情報 */
    protected final ParameterizedClassDesc parameterizedClassDesc;

    /**

            param.type = new TypeMetaData(it)
            return param
        }
        _ * method.ownerClass >> classMetaData
        _ * method.returnType >> new TypeMetaData(args.returnType ?: 'ReturnType')
        _ * javadocConverter.parse(method, !null) >> ({[parse("<para>${args.comment ?: 'comment'}</para>")]} as DocComment)
        return method
    }

    def methodDoc(String name) {

        String name = methodDeclaration.getNameAsString();

        String rawCommentText = getJavadocComment(methodDeclaration);
        TypeMetaData returnType = extractTypeName(methodDeclaration.getType());
        MethodMetaData methodMetaData = getCurrentClass().addMethod(name, returnType, rawCommentText);

        findAnnotations(methodDeclaration, methodMetaData);
        extractParameters(methodDeclaration, methodMetaData);