Mock，更確切地說應該是Mock Object。當我們在單元測試、模塊的接口測試時，當這個模塊需要依賴另外一個/幾個類，而這時這些類還沒有開發好，這時我們就可以定義Mock對象來模擬那些類的行為。

mock工具的其中一個非常重要的作用是指定函數的行為（模擬函數的行為）。可以對入參進行校驗，對出參進行設定，還可以指定函數的返回值。

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Google's framework for writing and using C++ mock classes on a variety of platforms (Linux, Mac OS X, Windows, Windows CE, Symbian, etc). Inspired by jMock, EasyMock, and Hamcrest, and designed with C++'s specifics in mind, it can help you derive better designs of your system and write better tests.

Google Mock:

• provides a declarative syntax for defining mocks,

• can easily define partial (hybrid) mocks, which are a cross of real and mock objects,

• handles functions of arbitrary types and overloaded functions,

• comes with a rich set of matchers for validating function arguments,

• uses an intuitive syntax for controlling the behavior of a mock,

• does automatic verification of expectations (no record-and-replay needed),

• allows arbitrary (partial) ordering constraints on function calls to be expressed,

• lets a user extend it by defining new matchers and actions.

• does not use exceptions, and

• is easy to learn and use.

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Google Mock is not a testing framework itself. Instead, it needs a testing framework for writing tests. Google Mock works seamlessly with?Google Test, but you can also use it with?any C++ testing framework.

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參考：

• https://blog.csdn.net/weixin_33807284/article/details/85093811

• https://blog.csdn.net/niceniuniu/article/details/65629401

• http://coney.github.io/2015/05/mock-static-function-with-mockcpp/

• https://www.cnblogs.com/jycboy/p/gmock_summary.html

• MockCpp手冊（中文）

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1.?代碼?mock_test.cc

#include <gtest/gtest.h> #include <gmock/gmock.h>using namespace testing;class A { public:int set(int num) {value = num;return num;}int get() {return value;}int value; };class MockA : public A { public:MOCK_METHOD1(set, int(int num));MOCK_METHOD0(get, int());};TEST(Atest, getnum) {MockA m_A;int a = 10;EXPECT_CALL(m_A, set(_)).WillRepeatedly(Return(a));int k = m_A.set(200);EXPECT_EQ(10, k); }int main(int argc, char *argv[]) {::testing::InitGoogleTest(&argc, argv);return RUN_ALL_TESTS(); }

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2.?編譯

g++ mock_test.cc -lgtest -lgmock -lpthread -std=c++11

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3.?測試執行

baoli@ubuntu:~/tools/gtest/mytest$ ./a.out [==========] Running 1 test from 1 test suite. [----------] Global test environment set-up. [----------] 1 test from Atest [ RUN ] Atest.getnum [ OK ] Atest.getnum (0 ms) [----------] 1 test from Atest (0 ms total)[----------] Global test environment tear-down [==========] 1 test from 1 test suite ran. (0 ms total) [ PASSED ] 1 test.

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4.?說明

4.1?MOCK_METHOD

????MOCK_METHOD1(set, int(int num));? ? //調用set方法，一個參數（int?num），返回int型

????MOCK_METHOD0(get, int());?? ??? ??? ?? ? //調用get方法，無參數，返回int型

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4.2 EXPECT_CALL

This means EXPECT_CALL() should be read as expecting that a call will occur in the future, not

that a call has occurred. Why does Google Mock work like that? Well, specifying the expectation

beforehand allows Google Mock to report a violation as soon as it arises, when the context (stack

trace, etc) is still available. This makes debugging much easier

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