C++单元测试(Unit Test)中Catch和Gmock的结合使用

1. Tutorial of Catch

Chinese version:
http://blog.guorongfei.com/2016/08/22/cpp-unit-test-catch/
Official(recommand, very clear and useful):
https://github.com/philsquared/Catch/blob/master/docs/Readme.md

2. Integrate Catch with Gmock in VS2013

In Short: Write custom main function and involve Gmock code in testcase of Catch in test code.

1. Structure

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2. Code

1. hello_world.h

#pragma once#include "messager.h"class HelloWorld{public:    HelloWorld();    virtual ~HelloWorld();    string getMessage(Messager *messager) const;};

2. messager.h

Class to be mocked.

#pragma once#include <string>using namespace std;class Messager{public:    virtual ~Messager() {}    virtual string getMessage() = 0;};

3. mock_messager.h

Mock Messager class.

#pragma once#include "messager.h"class MockMessager :public Messager{public:    MOCK_METHOD0(getMessage, string());};

4. hello_world.cpp

It invokes getMessage() in Messager.

#include "hello_world.h"#include "messager.h"HelloWorld::HelloWorld(){}HelloWorld::~HelloWorld(){}string HelloWorld::getMessage(Messager *messager) const{    return messager->getMessage();}

5. Test.cpp

For using Gmock, we need to write our own main function to involve
::testing::GTEST_FLAG(throw_on_failure) = true;
::testing::InitGoogleMock(&argc, argv);

Reference:
1. Gmock: Using Google Mock with Any Testing Framework
2. Catch: Supplying your own main()

//Test.cpp// write your own main function#define CATCH_CONFIG_RUNNER#include "catch.hpp"#include "gmock/gmock.h"#include "mock_messager.h"#include "hello_world.h"#include <String>using namespace testing;TEST_CASE("Test Gmock", "[MockMessager]") {    MockMessager messager;    std::string msg = "Hello World";    EXPECT_CALL(messager, getMessage()).WillRepeatedly(Return(ByRef(msg)));    HelloWorld helloWorld;    SECTION("HandleGetMessage") {        //CAPTURE(helloWorld.getMessage(&messager));        REQUIRE("Hello Worl" == helloWorld.getMessage(&messager));    }}int main(int argc, char* argv[]){    // The following line causes Google Mock to throw an exception on failure,    // which will be interpreted by your testing framework as a test failure.    ::testing::GTEST_FLAG(throw_on_failure) = true;    ::testing::InitGoogleMock(&argc, argv);    // global setup...    int result = Catch::Session().run(argc, argv);    // global clean-up...    system("pause");    return (result < 0xff ? result : 0xff);}

6. Result

I intentionally misspell the required word “hello_worl” for showing the fail report.

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3. Problem

Integrate Catch and Gmock will cause the conflicts of two macros FAIL and SUCCEED. Thank god, these two macros are not necessary, just don't use them :) and can be realized using other macros.
1. FAIL
A macro for log information in Catch. FAIL(message expression), test will fail, if the expression is true.
2. SUCCEED
Not in the tutorial. It’s also a macro for log information.