return new String(buf);
    }

    private static String getSignature(final Class<?>... paramTypes) {
        if (paramTypes == null || paramTypes.length == 0) {
            return "";
        }
        final StringBuilder buf = new StringBuilder(100);
        for (final Class<?> type : paramTypes) {
            if (type != null) {
                buf.append(type.getName());
            } else {

    def method(Map<String, ?> args, String name, ClassMetaData classMetaData) {
        MethodMetaData method = Mock()
        List<String> paramTypes = args.paramTypes ?: []
        _ * method.name >> name
        _ * method.overrideSignature >> "$name(${paramTypes.join(', ')})"
        _ * method.parameters >> paramTypes.collect {
            def param = new ParameterMetaData("p");
            param.type = new TypeMetaData(it)
            return param

    def method(Map<String, ?> args, String name, ClassMetaData classMetaData) {
        MethodMetaData method = Mock()
        List<String> paramTypes = args.paramTypes ?: []
        _ * method.name >> name
        _ * method.overrideSignature >> "$name(${paramTypes.join(', ')})"
        _ * method.parameters >> paramTypes.collect {
            def param = new ParameterMetaData("p");
            param.type = new TypeMetaData(it)
            return param

        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)'
    }

    def formatsOverrideSignatureUsingRawParameterTypes() {

    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)
        .that(TypeToken.of(returnType).isSupertypeOf(paramType))

    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)
        .that(TypeToken.of(returnType).isSupertypeOf(paramType))

    FreshValueGenerator paramValues = new FreshValueGenerator();
    List<@Nullable Object> passedArgs = Lists.newArrayList();
    for (Class<?> paramType : method.getParameterTypes()) {
      passedArgs.add(paramValues.generateFresh(paramType));
    }
    return passedArgs.toArray();
  }

  /** Tests a single interaction against a method. */

    FreshValueGenerator paramValues = new FreshValueGenerator();
    List<@Nullable Object> passedArgs = Lists.newArrayList();
    for (Class<?> paramType : method.getParameterTypes()) {
      passedArgs.add(paramValues.generateFresh(paramType));
    }
    return passedArgs.toArray();
  }

  /** Tests a single interaction against a method. */