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c++ - 调用另一个模拟函数时更改模拟函数的返回值

转载 作者:行者123 更新时间:2023-12-01 14:47:19 24 4
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假设我有以下模拟

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 doAction()被称为, getState()应该返回 BUSY .
我如何在 GMock 下编码这个假设?我想保留 getState()作为一个模拟函数,因为我需要测试其他返回值。
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));
}));
但这给出了以下神秘错误:
/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_(); }

最佳答案

您可以在 docs 中查看如何执行此操作的示例。 .
跟着你的课。
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“假”对象可以在调用之间保持状态。您还可以根据需要创建尽可能多的“假”类。
和测试:
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.
}

关于c++ - 调用另一个模拟函数时更改模拟函数的返回值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/62947815/

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