匹配gmock中的结构

Matching a struct in gmock

本文关键字：结构 gmock 匹配      更新时间：2023-10-16

我正试图在与结构匹配的地方进行一个简单的gmock测试。然而，我在gmock的内部发现了编译器错误。

在前言中，我想指出的是，我已经定义了operator ==，并且我可以使用==自己比较这些结构。定义为：

inline bool operator==(const MyStruct& lhs, const MyStruct& rhs)
{
    return true;
}

这是g++给出的错误：

In file included from /unit_test/gmock/gmock-1.7.0/include/gmock/gmock-spec-builders.h:75:0,
                 from /unit_test/gmock/gmock-1.7.0/include/gmock/gmock-generated-function-mockers.h:43,
                 from /unit_test/gmock/gmock-1.7.0/include/gmock/gmock.h:61,
                 from /unit_test/tests.cpp:3:
/unit_test/gmock/gmock-1.7.0/include/gmock/gmock-matchers.h: In instantiation of ‘bool testing::internal::EqMatcher<Rhs>::Impl<Lhs>::MatchAndExplain(Lhs, testing::MatchResultListener*) const [with Lhs = MyStruct&; Rhs = MyStruct]’:
/unit_test/tests.cpp:115:1:   required from here
/unit_test/gmock/gmock-1.7.0/include/gmock/gmock-matchers.h:912:1: error: no match for ‘operator==’ in ‘lhs == ((const testing::internal::EqMatcher<MyStruct>::Impl<MyStruct&>*)this)->testing::internal::EqMatcher<MyStruct>::Impl<MyStruct&>::rhs_’
/unit_test/gmock/gmock-1.7.0/include/gmock/gmock-matchers.h:912:1: note: candidates are:
In file included from /unit_test/gmock/gmock-1.7.0/gtest/include/gtest/internal/gtest-param-util.h:45:0,
                 from /unit_test/gmock/gmock-1.7.0/gtest/include/gtest/gtest-param-test.h:192,
                 from /unit_test/gmock/gmock-1.7.0/gtest/include/gtest/gtest.h:62,
                 from /unit_test/tests.cpp:2:
/unit_test/gmock/gmock-1.7.0/gtest/include/gtest/internal/gtest-linked_ptr.h:213:6: note: template<class T> bool testing::internal::operator==(T*, const testing::internal::linked_ptr<T>&)
/unit_test/gmock/gmock-1.7.0/gtest/include/gtest/internal/gtest-linked_ptr.h:213:6: note:   template argument deduction/substitution failed:
In file included from /unit_test/gmock/gmock-1.7.0/include/gmock/gmock-spec-builders.h:75:0,
                 from /unit_test/gmock/gmock-1.7.0/include/gmock/gmock-generated-function-mockers.h:43,
                 from /unit_test/gmock/gmock-1.7.0/include/gmock/gmock.h:61,
                 from /unit_test/tests.cpp:3:
/unit_test/gmock/gmock-1.7.0/include/gmock/gmock-matchers.h:912:1: note:   mismatched types ‘T*’ and ‘MyStruct’
In file included from /ifs/MyStruct.h:14:0,
                 from /unit_test/mocks.h:1,
                 from /unit_test/tests.cpp:1:

下面是我定义的其他operator ==的巨大列表，它们与我创建的结构无关。比如：

 /ifs/types.h:2123:5: note: bool operator==(EnumType, const string&)
 /ifs/types.h:2123:5: note:   no known conversion for argument 1 from ‘MyStruct’ to ‘EnumType’
...etc

我的mock方法定义为：

MOCK_METHOD1(send, int(MyStruct& data));

我正试图用这个来匹配：

MyStruct data;
if(data == data); // this compiles fine
EXPECT_CALL(mockObj, send(data)); // this does not compile, why?

似乎operator==在Google Mock matcher正在寻找的命名空间中不可用。您需要在全局命名空间中声明它，或者在中定义了命名空间MyStruct（因此依赖于参数的查找有效）。不能将其放在与MyStruct定义的名称空间不同的非全局名称空间中，也不能将其作为fixture的成员。

您可以在测试命名空间中使用该方法，如下所示：

namespace testing::internal {
bool operator==(const MyStruct& lhs, const MyStruct& rhs)
{
    return lhs.foo == rhs.foo;
}
}
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