c++ - 模板模拟上的 EXPECT_CALL

Question

我的 mock 定义如下:

template<typename T>
class ParseTreeMock : public ParseTreeInterface<T> {
    public:
        MOCK_METHOD1(fillConfigTree, void(std::string const&));
        MOCK_METHOD1_T(getProperty, T(std::string const&));
        ParseTreeMock(): parseTree(std::make_unique<pt::ptree>()) {
        }
        static std::unique_ptr<ParseTreeInterface<T>> getDefaultTree() {
            return std::make_unique<ParseTreeMock<T>>();
        }
    private:
        std::unique_ptr<pt::ptree> parseTree;
};

稍后在测试用例中创建:

class ConfigTest : public ::testing::Test {
    protected:
        std::unique_ptr<ParseTreeInterface<std::string>> treeMock;
        virtual void SetUp() {
            treeMock = ParseTreeMock<std::string>::getDefaultTree();
        }
};

我想在 getProperty 方法上设置返回特定值:

EXPECT_CALL(*treeMock, getProperty("miniReaderConfig.cacheConfig.cacheOnOff")).willOnce(Return(false));

我得到错误:

In file included from ./lib/googletest/googlemock/include/gmock/gmock-generated-function-mockers.h:43:0,
                 from ./lib/googletest/googlemock/include/gmock/gmock.h:61,
                 from ./test/UT/Mocks/ParseTreeMock.hpp:2,
                 from test/UT/Configuration/ConfigTest.cpp:1:
test/UT/Configuration/ConfigTest.cpp: In member function ‘virtual void ConfigTest_CreateConfigurationWithoutErrors_Test::TestBody()’:
./lib/googletest/googlemock/include/gmock/gmock-spec-builders.h:1844:12: error: ‘class miniReader::Configuration::ParseTreeInterface<std::__cxx11::basic_string<char> >’ has no member named ‘gmock_getProperty’; did you mean ‘getProperty’?
     ((obj).gmock_##call).InternalExpectedAt(__FILE__, __LINE__, #obj, #call)

感谢任何带有错误解释的解决方案。

Answer 1

treeMock变量需要是 std::unique_ptr<ParseTreeMock<std::string>> 类型, 然后静态方法需要看起来像这样

static std::unique_ptr<ParseTreeMock<T>> getDefaultTree()
{
  return std::make_unique<ParseTreeMock<T>>();
}

通常，您实例化一个在测试中实现接口(interface)的类，然后将该实例传递给您正在测试的类，并使用 EXPECT_CALL s 你确保你正在测试的类调用你的模拟对象的回调。

与您遇到的错误无关，但WillOnce需要首字母大写拼写。此外，由于您将模板变量设置为 std::string , EXPECT_CALL不能指望返回 bool 值。

这为我编译:

  namespace pt { struct ptree {};}

  template<typename T>
  class ParseTreeInterface
  {
   public:
    virtual void fillConfigTree(std::string const&) = 0;
    virtual T getProperty(std::string const&) = 0;

  };


  template<typename T>
  class ParseTreeMock : public ParseTreeInterface<T> {
   public:
    MOCK_METHOD1(fillConfigTree, void(std::string const&));
    MOCK_METHOD1_T(getProperty, T(std::string const&));
    ParseTreeMock(): parseTree(std::make_unique<pt::ptree>()) {
    }
    static std::unique_ptr<ParseTreeMock<T>> getDefaultTree()
    {
      return std::make_unique<ParseTreeMock<T>>();
    }
   private:
    std::unique_ptr<pt::ptree> parseTree;
  };

  class ConfigTest : public ::testing::Test {
   protected:
    std::unique_ptr<ParseTreeMock<std::string>> treeMock;
    virtual void SetUp() {
      treeMock = ParseTreeMock<std::string>::getDefaultTree();
    }
  };

  TEST_F(ConfigTest, test)
  {
    EXPECT_CALL(*treeMock, getProperty("miniReaderConfig.cacheConfig.cacheOnOff")).WillOnce(::testing::Return(""));
  }