[英]Is it possible to mock a called function return value using gtest or gmock?
[英]Change return value of a mock function when another mock function is called
假設我有以下模擬
enum class State
{
IDLE,
BUSY,
ERROR1,
ERROR2
};
class MockActuator : public ActuatorInterface
{
public:
MOCK_METHOD0(doAction, void());
MOCK_METHOD0(getState, State());
};
我正在測試的模塊假設如果調用doAction()
, getState()
應該返回BUSY
。
我如何在 GMock 下對這個假設進行編碼? 我想將getState()
保留為模擬的 function,因為我需要測試其他返回值。
我的第一次嘗試如下:
EXPECT_CALL(actuator, doAction()).Times(1).WillOnce(InvokeWithoutArgs(
[&](){
ON_CALL(actuator, getState()).WillByDefault(Return(State::BUSY));
}));
但這給出了以下神秘錯誤:
/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_(); }
您可以在文檔中查看如何執行此操作的示例。
跟着你的課。
首先是模仿原件的假 class:
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,模擬 class:
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.
};
就是這個“假的”object可以在通話之間保留state。 您還可以根據需要創建盡可能多的“假”類。
和測試:
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.
}
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