unit-testing - 如何对回调函数进行单元测试？ (C++ boost 单元测试)

Question

我想对客户端/服务器功能进行单元测试。客户端调用服务器，服务器调用回调函数。像这样的东西:

void CallBack()
{
    BOOST_SUCCESS(); // test is successful if this is called
}

BOOST_AUTO_TEST_CASE( ConnectionTest_ClientCallback )
{
    CallServer(); // server will do work and call CallBack()
    sleep(20);
    BOOST_FAIL("Server hasn't called CallBack() within specified time limit.");
}

但是上面的方法不起作用，因为在任何测试期间都可以调用 CallBack()。有更好的方法吗？

Answer 1

在回调函数中设置一个变量:

void CallBack()
{
    callBackCalled = true;
}

并在测试中测试:

BOOST_AUTO_TEST_CASE( ConnectionTest_ClientCallback )
{
    callbackCalled = false;
    CallServer(); // server will do work and call CallBack()
    sleep(20);
    if (callbackCalled)
        BOOST_SUCCESS();
    else
        BOOST_FAIL("Server hasn't called CallBack() within specified time limit.");
}

编辑:kizzx2 建议的更好的解决方案:

BOOST_AUTO_TEST_CASE( ConnectionTest_ClientCallback )
{
    callbackCalled = false;
    CallServer(); // server will do work and call CallBack()
    sleep(20);
    BOOST_CHECK_MESSAGE(callbackCalled, "Server hasn't called CallBack() within specified time limit.");
}