C++ gtest—确保在某个方法调用之前未调用某个方法，但可以在某个方法调用之后调用该方法

如何测试

setState（）

方法在

subscribe（）

之前未被调用，同时允许但不强制在之后调用它

下面的代码显示了我想要实现的目标

这是我要测试的方法：

...

void FirstState::enter()
{
    mInfoSubscription.subscribe(mInfoListener);

    mStateMachine.setState(mFactory.makeState(StateId::SecondState));
}

...

这是一个单元测试：

class FirstStateTest : public ::testing::Test {
protected:
    FirstStateTest()
        : mFirstState{mMockStateMachine, mMockStatesFactory,
                      mMockInfoSubscription, mMockInfoListener}
    {
    }

    NiceMock<MockStateMachine> mMockStateMachine;
    NiceMock<MockStatesFactory> mMockStatesFactory;
    NiceMock<MockInfoSubscription> mMockInfoSubscription;
    NiceMock<MockInfoListener> mMockInfoListener;

    FirstState mFirstState;
};

TEST_F(FirstStateTest, ensure_that_subscription_is_done_before_state_change)
{
    // This method must not be called before "subscribe()".
    EXPECT_CALL(mMockStateMachine, doSetState(_)).Times(0);  // doesn't work the way I want

    EXPECT_CALL(mMockInfoSubscription, subscribe(_)).Times(1);

    // At this moment it doesn't matter if this method is called or not.
    EXPECT_CALL(mMockStateMachine, doSetState(_)).Times(AtLeast(0));  // doesn't work the way I want

    mFirstState.enter();
}

// other unit tests ...
...

您可以使用以确保预期的调用是有序的

TEST_F(FirstStateTest, ensure_that_subscription_is_done_before_state_change) {
  InSequence expect_calls_in_order;

  // `subscribe` must be called first.
  EXPECT_CALL(mMockInfoSubscription, subscribe(_)).Times(1);

  // After the `subscribe` call, expect any number of SetState calls.
  EXPECT_CALL(mMockStateMachine, doSetState(_)).Times(AtLeast(0));

  mFirstState.enter();
}

---

InSequence

是一种声明订单的简单方法，但它适用于其范围内的所有

EXPECT\u CALL

s。如果需要更灵活的指定顺序的方法，请使用

顺序

，请参阅

TEST_F(FirstStateTest, ensure_that_subscription_is_done_before_state_change) {
  InSequence expect_calls_in_order;

  // `subscribe` must be called first.
  EXPECT_CALL(mMockInfoSubscription, subscribe(_)).Times(1);

  // After the `subscribe` call, expect any number of SetState calls.
  EXPECT_CALL(mMockStateMachine, doSetState(_)).Times(AtLeast(0));

  mFirstState.enter();
}