Gtest源码剖析:1.实现一个超级简单的测试框架xtest-白红宇

Gtest源码剖析:1.实现一个超级简单的测试框架xtest

阅读量：6832 次

发布时间：2019-06-26

本文共 2744 字，大约阅读时间需要 9 分钟。

下面的代码模仿gtest实现，主要说明了以下两点:

ASSERT_* 和 EXPECT_*系列断言的原理和作用.

gtest是怎样通过宏自动注册测试代码让其自动运行的.

1 #include 
        
          2 #include 
         
           3 #include 
          
            4 #include 
           
             5  6  7 #define ASSERT_EQ(a,b) if((a) != (b)) \ 8     { \ 9         std::cout<<"[     FAIL ] "<<#a<<" not equal "<<#b<
            
             (this)); \45         } \46         virtual void testBody(); \47         static MAKE_CLASS_NAME(test_case_name, test_name) * instance; \48 }; \49 MAKE_CLASS_NAME(test_case_name, test_name) * MAKE_CLASS_NAME(test_case_name, test_name) ::instance \50     = new MAKE_CLASS_NAME(test_case_name, test_name) ();\51 void MAKE_CLASS_NAME(test_case_name, test_name)::testBody()52 53 #define TEST(test_case_name, test_name) XTEST_TEST(test_case_name, test_name)54 55 56 namespace xtest {57 58     class Test{59         friend class UnitTest;60     public:61         Test(const std::string &n1, const std::string& n2):test_case_name(n1), test_name(n2){62         }63         virtual void testBody() = 0;64         std::string test_case_name;65         std::string test_name;66     private:67         Test(const Test&) = delete;68         Test& operator=(const Test&) = delete;69     };70 71     class UnitTest {72     public:73         static UnitTest* getInstance();74         void Run();75         static void regist(std::shared_ptr
             
               const& a);76 private:77 static UnitTest* instance;78 std::vector
              
               
                > all_tests12;79 };80 }81 82 inline void RUN_ALL_TESTS(){83 xtest::UnitTest::getInstance()->Run();84 }

1 #include "xtest.h" 2 namespace xtest{ 3  4     UnitTest* UnitTest::instance = NULL; 5     UnitTest* UnitTest::getInstance(){ 6         if(instance == NULL){ 7             instance = new UnitTest(); 8         } 9         return instance;10     }11     void UnitTest::Run(){12         std::cout<<"[==========] Start XTest..."<
        
         test_case_name<<"."<<(*i)->test_name<
         
          testBody();16             std::cout<
          
           const& a){20         getInstance()->all_tests12.push_back(a);21     }22 }

现在看看怎么用吧

1 #include "xtest.h" 2  3 TEST(t1,t2){ 4     ASSERT_EQ(1,1); 5     ASSERT_EQ(1,2); 6     ASSERT_EQ(2,3); 7 } 8 TEST(t3,t4){ 9     EXPECT_EQ(1,1);10     EXPECT_EQ(1,2);11     EXPECT_EQ(2,3);12 }13 int main(int argc, char* argv[]) {14 15     RUN_ALL_TESTS();16     return 0;17 }

输出结果：

1 [==========] Start XTest...2 [ RUN      ] t1.t23 [       OK ]4 [     FAIL ] 1 not equal 25 6 [ RUN      ] t3.t47 [       OK ]8 [     FAIL ] 1 not equal 29 [     FAIL ] 2 not equal 3