C++ 在调用另一个模拟函数时更改模拟函数的返回值
假设我有下面的例子C++ 在调用另一个模拟函数时更改模拟函数的返回值,c++,googletest,googlemock,C++,Googletest,Googlemock,假设我有下面的例子 enum class State { IDLE, BUSY, ERROR1, ERROR2 }; class MockActuator : public ActuatorInterface { public: MOCK_METHOD0(doAction, void()); MOCK_METHOD0(getState, State()); }; 我正在测试的模块假设如果调用了doAction(),ge
enum class State
{
IDLE,
BUSY,
ERROR1,
ERROR2
};
class MockActuator : public ActuatorInterface
{
public:
MOCK_METHOD0(doAction, void());
MOCK_METHOD0(getState, State());
};
我正在测试的模块假设如果调用了doAction()
,getState()
应该返回BUSY
我如何在GMock下对这个假设进行编码?我想将getState()
保留为模拟函数,因为还有其他返回值需要测试
我的第一次尝试如下:
EXPECT_CALL(actuator, doAction()).Times(1).WillOnce(InvokeWithoutArgs(
[&](){
ON_CALL(actuator, getState()).WillByDefault(Return(State::BUSY));
}));
但这会产生以下隐晦的错误:
/usr/src/googletest/googlemock/include/gmock/gmock-actions.h:861:64: error: void value not ignored as it ought to be
Result Perform(const ArgumentTuple&) { return function_impl_(); }
您可以在中看到如何执行此操作的示例 跟着你的课走 首先是一个模仿原始类的假类:
enum class State
{
IDLE,
BUSY,
ERROR1,
ERROR2
};
class FakeActuator : public ActuatorInterface
{
public:
virtual void doAction () { _state = BUSY; }
virtual State getState () { return _state; }
private:
State _state;
};
之后,模拟类:
class MockActuator : public ActuatorInterface {
public:
// Normal mock method definitions using gMock.
MOCK_METHOD(void, doAction, (), (override));
MOCK_METHOD(State, getState, (), (override));
// Delegates the default actions of the methods to a FakeActuator object.
// This must be called *before* the custom ON_CALL() statements.
void DelegateToFake() {
ON_CALL(*this, doAction).WillByDefault([this]() {
fake_.doAction();
});
ON_CALL(*this, getState).WillByDefault([this]() {
return fake_.getState();
});
}
private:
FakeActuator fake_; // Keeps an instance of the fake in the mock.
};
正是这个“伪”对象可以在调用之间保持状态。您还可以根据需要创建任意数量的“假”类
以及测试:
TEST(AbcTest, Xyz) {
MockFoo foo;
foo.DelegateToFake(); // Enables the fake for delegation.
// Put your ON_CALL(foo, ...)s here, if any.
// No action specified, meaning to use the default action.
EXPECT_CALL(foo, doAction());
EXPECT_CALL(foo, getState());
foo.doAction(); // FakeActuator::doAction() is invoked.
EXPECT_EQ(BUSY, foo.getState()); // FakeActuator::getState() is invoked.
}