我用模拟课写了一个小测试。当我运行它时,首先我得到一个警告,即调用了一个无趣的模拟函数,然后测试失败,因为没有满足期望,即模拟函数被调用至少一次。有趣的是,当我看到上面的警告信息时,调用该函数。
你对这件事有什么看法吗?
谢谢!
编辑:这是我的代码结构:
class Bla {
public:
Bla();
virtual ~Bla();
virtual float myFunction();
}
class MockBla : public Bla {
MockBla();
~MockBla();
MOCKMETHOD0(myFunction, float());
}
class CallerClass {
public:
CallerClass() { MockBla* myMock = new MockBla(); }
virtual ~CallerClass();
myCallingFunction() { myMock->myFunction(); }
}
class MyTestClass : public ::testing::Test {
//....
TEST(myTest, testMyFunction) {
MockBla mockBla;
EXPECT_CALL(mockBla, myFunction()).Times(AtLeast(1));
CallerClass* callerClass;
callerClass = new CallerClass();
callerClass->myCallingFunction();
}
//....
}
结果:
[ RUN ] MyTestClass.testMyFunction
GMOCK WARNING:
Uninteresting mock function call - returning default value.
Function call: myFunction()
Returns: 0
Stack trace:
MyTestClass.cpp:99: Failure
Actual function call count doesn't match EXPECT_CALL(mockBla, myFunction())...
Expected: to be called at least once
Actual: never called - unsatisfied and active
答案 0 :(得分:10)
您需要设置对模拟类的实际实例的期望,这将在测试执行期间调用。
在您的情况下,您正在设置对象mockBla
的期望值,该对象仅在测试结束时被构造然后被破坏 - 它永远不会被使用。
您需要将模拟对象传递给要使用的CallerClass
,或者允许CallerClass
将模拟对象创建为成员变量,然后允许测试访问该实际成员(通过例如获取者或允许测试成为CallerClass
的朋友)。
将模拟对象传递给调用类的示例如下:
#include <memory>
#include "gmock/gmock.h"
class Bla {
public:
virtual ~Bla() {}
virtual float myFunction() = 0;
};
class MockBla : public Bla {
public:
MOCK_METHOD0(myFunction, float());
};
class CallerClass {
public:
explicit CallerClass(Bla* bla) : mBla(bla) {}
void myCallingFunction() { mBla->myFunction(); }
private:
Bla* mBla;
};
TEST(myTest, testMyFunction) {
std::shared_ptr<Bla> mockBla(new MockBla);
EXPECT_CALL(*std::static_pointer_cast<MockBla>(mockBla),
myFunction()).Times(testing::AtLeast(1));
CallerClass callerClass(mockBla.get());
callerClass.myCallingFunction();
}
int main(int argc, char** argv) {
testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}