我正在尝试为包含三个重载方法的类编写mock,即:
#include <gtest/gtest.h> #include <gmock/gmock.h> using ::testing::_; using ::testing::Return; using ::testing::A; using ::testing::ByRef; using ::testing::Ref; using ::testing::TypedEq; struct Foo { int fooMethod(const int& intParam) { return 0; } int fooMethod(const float& floatParam) { return 0; } int fooMethod(const std::string& stringParam) { return 0; } }; struct FooMock { FooMock() { ON_CALL(*this,fooMethod(_)).WillByDefault(Return(-1)); } MOCK_METHOD1(fooMethod,int(const int& intParam)); MOCK_METHOD1(fooMethod,int(const float& floatParam)); MOCK_METHOD1(fooMethod,int(const std::string& stringParam)); };
但这会给出一个错误:
error: call of overloaded ‘gmock_fooMethod(const testing::internal::AnythingMatcher&)’ is ambiguous
我也尝试过TypedEq()而不是“_”,但它会给出更多模糊的错误.我检查了GMock常见问题解答,Wiki并没有找到解决方案 – 如何为重载方法返回ON_CALL的默认值?
BR,
卢卡斯
解决方法
@ tx34有答案的关键,但代码中还有一些问题.
首先,Selecting Between Overloaded Functions上的文档是最合适的.你有三个fooMethod重载,它们具有相同数量的参数但参数类型不同.您将不得不使用指定类型的匹配器.
接下来,您需要定义所有要模拟为虚拟的Foo函数,否则通过Foo对象调用它们将不会调用派生的模拟函数.由于您将Foo定义为基类,因此它还应该有一个虚拟析构函数来避免切片.
最后,你需要从Foo继承FooMock.
所以把它们放在一起,你得到的结果如下:
#include <memory> #include <string> #include "gtest/gtest.h" #include "gmock/gmock.h" using ::testing::_; using ::testing::An; using ::testing::Matcher; using ::testing::TypedEq; using ::testing::Return; struct Foo { virtual ~Foo() {} virtual int fooMethod(const int&) { return 0; } virtual int fooMethod(const float&) { return 0; } virtual int fooMethod(const std::string&) { return 0; } }; struct FooMock : Foo { FooMock() : Foo() { ON_CALL(*this,fooMethod(An<const int&>())). WillByDefault(Return(-1)); ON_CALL(*this,fooMethod(Matcher<const float&>(_))). WillByDefault(Return(-2)); ON_CALL(*this,fooMethod(TypedEq<const std::string&>("1"))). WillByDefault(Return(-3)); } MOCK_METHOD1(fooMethod,int(const std::string& stringParam)); }; TEST(Foo,foo) { std::shared_ptr<Foo> foo(new FooMock); auto foo_mock(std::dynamic_pointer_cast<FooMock>(foo)); EXPECT_CALL(*foo_mock,fooMethod(Matcher<const int&>(_))).Times(1); EXPECT_CALL(*foo_mock,fooMethod(Matcher<const float&>(_))).Times(1); EXPECT_CALL(*foo_mock,fooMethod(Matcher<const std::string&>(_))).Times(1); EXPECT_EQ(-1,foo->fooMethod(1)); EXPECT_EQ(-2,foo->fooMethod(1.0f)); EXPECT_EQ(-3,foo->fooMethod("1")); } int main(int argc,char **argv) { testing::InitGoogleTest(&argc,argv); return RUN_ALL_TESTS(); }