gmock | 易学教程

编写优美的GTest测试案例

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使用gtest也有很长一段时间了，这期间也积累了一些经验，所以分享一下。GTest为我们提供了便捷的测试框架，让我们只需要关注案例本身。如何在GTest框架下写出优美的测试案例，我觉得必须要做到：案例的层次结构一定要清晰案例的检查点一定要明确案例失败时一定要能精确的定位问题案例执行结果一定要稳定案例执行的时间一定不能太长案例一定不能对测试环境造成破坏案例一定独立，不能与其他案例有先后关系的依赖案例的命名一定清晰，容易理解案例的可维护性也是非常重要，如果做到上面的8点，自然也就做到了可维护性。下面来分享一下我对于上面8点的经验： 1. 案例的层次结构一定要清晰所谓层次结构，至少要让人一眼就能分辨出被测代码和测试代码。简单的说，就是知道你在测什么。由于是进行接口测试，我已经习惯了如下的案例层次： DataDefine 我会将测试案例所需要的数据，以及数据之间的联系全部在预先定义好。测试数据与案例逻辑的分离，有利于维护和扩展测试案例。同时，GTest先天就支持测试数据参数化，为测试数据的分离提供了进一步的便捷。什么是测试数据参数化？就是你可以预先定义好一批各种各样的数据，而你只需要编写一个测试案例的逻辑代码，gtest会将定义好的数据逐个套入测试案例中进行执行。具体的做法请见：玩转Google开源C++单元测试框架Google Test系列(gtest)之四 -

How to use gmock MOCK_METHOD for overloaded operators?

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问题 I am new to googlemock (and StackOverflow). I got a problem when using MOCK_METHODn in googlemock and I believe this function is widely used. Here is what I did. I have an abstract class Foo with virtual overloaded operator[] : class Foo{ public: virtual ~Foo(){}; virtual int operator [] (int index) = 0; } and I want to use googlemock to get a MockFoo : class MockFoo: public Foo{ public: MOCK_METHOD1(operator[], int(int index)); //The compiler indicates this line is incorrect } However, this

gmock/google-mock issues warning and fails the test with mocking exceptions

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问题 I have coded a demo mock using google mock. The issue is that it is failing and not properly mocking. I cannot understand the issue here. Code: test/mock_turtle_test.cc #include "mock_turtle.h" #include "../painter.h" #include <gtest/gtest.h> using ::testing::_; using ::testing::AtLeast; using ::testing::Return; ACTION(MyException) { throw(error_k()); } TEST(PainterTest, CanDrawSomething) { Painter painter; EXPECT_CALL(*(painter.getTurtle()), PenDown()) .Times(AtLeast(1)) .WillOnce

google mock - can I call EXPECT_CALL multiple times on same mock object?

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问题 If I call EXPECT_CALL twice on the same mock object in the same TEST_F . . . what happens? Are the expectations appended to the mock object or does the second call erase the effects of the first call? I found The After Clause which appears to imply that multiple calls to same mock + EXPECT_CALL are allowed. 回答1: Yes, you can call EXPECT_CALL on the same mock object multiple times. As long as you assure that all EXPECT_CALL were called before the mocked methods were actually used. Otherwise

How to use gmock to mock up a std::function?

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问题 The constructor of my class is A( ... std::function<bool(const std::string&, const std::string&)> aCallBack, ... ); I want to use EXPECT_CALL to test it. This callback is from another class B. I created a Mock like class BMock : public B { MOCK_METHOD2( aCallBack, bool(const std::string&, const std::string&) ); } Then I tried B *b = new B(); std::function<bool(const std::string&, const std::string&)> func = std::bind(&B::aCallBack, b, std::PlaceHolders::_1, std::PlaceHolders::_2); It still

google mock - how to say “function must be called ONCE with a certain parameter but ok to be called many times with different parameters”?

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问题 I need to detect that a given function has been called exactly ONCE with a certain set of arguments. EXPECT_CALL(Mock_Obj, func("abc")).Times(1) but it's ok for that function to be called with different arguments any number of times. How do I express that? 回答1: In Google Mock, later expectations override earlier ones (more details in the docs), so you can write this: EXPECT_CALL(Mock_Obj, func(_)).Times(AnyNumber()); EXPECT_CALL(Mock_Obj, func("abc")).Times(1); 回答2: Do like VladLosev said.

google mock - how to say “function must be called ONCE with a certain parameter but ok to be called many times with different parameters”?

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google mock - how to say “function must be called ONCE with a certain parameter but ok to be called many times with different parameters”?

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How to mock methods return object with deleted copy-ctor?

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问题 If an interface has a function to create an object with deleted copy-ctor, how to mock this function? Gmock seems to use the object's copy constructor internally. E.g. // The object with deleted copy-ctor and copy-assignment class TTest { public: TTest() = delete; TTest(const TTest&) = delete; TTest& operator=(const TTest&) = delete; TTest(TTest&&) = default; TTest& operator=(TTest&&) = default; explicit TTest(int) { } }; // My interface to mock class MyInterface { public: virtual

gmock - how to mock function with noexcept specifier

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问题 I need to mock the following function: virtual void fun() noexcept = 0; Is it possible using gmock ? Gmock has the following macro: #define GMOCK_METHOD0_(tn, constness, ct, Method, ...) but there is a comment: // INTERNAL IMPLEMENTATION - DON'T USE IN USER CODE!!! Moreover I don't know how to use that macro (what the parameters tn and ct means) ? Edit The following mock: GMOCK_METHOD0_(, noexcept, ,fun, void()); compiles with gmock 1.7.0 but when I compile it using gmock 1.8.1 I get the