一个google Test文件C++语言案例

// Calculator.h  
#ifndef CALCULATOR_H  
#define CALCULATOR_H  
  
class Calculator {  
public:  
    double result;
    Calculator();
    void add(double a);  
    void subtract(double a);  
    void multiply(double a);  
    void divide(double a);
    double getresult();
};  
  
#endif

// Calculator.cpp  
#include "calculator.h"  
double result;
Calculator::Calculator(){
    Calculator::result = 0;
}
void Calculator::add(double a) {  
    Calculator::result = a + Calculator::result;  
}  
void Calculator::subtract(double a) {  
    Calculator::result = a - Calculator::result;;  
}  
void Calculator::multiply(double a) {  
    Calculator::result = a * Calculator::result;;  
}  
void Calculator::divide(double a) {  
    if (Calculator::result == 0) throw "Division by zero";  
    Calculator::result = a / Calculator::result;
}        
double Calculator::getresult() {  
    return Calculator::result;
}

// CalculatorTest.cpp  
#include "calculator.h"  
#include  
    
TEST(CalculatorTest, AddTest) {  
    Calculator calc;
    calc.add(1); 
    calc.add(1);  
    EXPECT_EQ(calc.getresult(), 2);    
}    
TEST(CalculatorTest, SubtractTest) {  
    Calculator calc;  
    calc.add(3);
    calc.subtract(7);
    EXPECT_EQ(calc.getresult(), 4);   
}    
TEST(CalculatorTest, MultiplyTest) {  
    Calculator calc;  
    calc.add(3);
    calc.multiply(4);
    EXPECT_EQ(calc.getresult(), 12);   
}    
TEST(CalculatorTest, DivideTest) {  
    Calculator calc;
    calc.add(3);  
    calc.divide(9);
    EXPECT_EQ(calc.getresult(), 3);
}    
TEST(CalculatorTest, DivideTestByZero) {
    Calculator calc;
    calc.add(0);  
    EXPECT_THROW({calc.divide(1);}, const char*);
}

int main(int argc,char* argv[])
{
        testing::GTEST_FLAG(output) = "xml:"; //若要生成xml结果文件
        testing::InitGoogleTest(&argc,argv); //初始化    
        return RUN_ALL_TESTS();              //跑单元测试
}

mkdir lib
cp /home/jerery/googletest-main/lib/*.a ./lib

g++ -std=c++14 calculator.cpp calculatorTest.cpp calculator.h TestAll.cpp -lgtest -lgtest_main -pthread -o test 

./test --gtest_output=xml
# ./test --gtest_output=xml
[==========] Running 4 tests from 1 test suite.
[----------] Global test environment set-up.
[----------] 4 tests from CalculatorTest
[ RUN      ] CalculatorTest.AddTest
[       OK ] CalculatorTest.AddTest (0 ms)
[ RUN      ] CalculatorTest.SubtractTest
[       OK ] CalculatorTest.SubtractTest (0 ms)
[ RUN      ] CalculatorTest.MultiplyTest
[       OK ] CalculatorTest.MultiplyTest (0 ms)
[ RUN      ] CalculatorTest.DivideTest
[       OK ] CalculatorTest.DivideTest (0 ms)
[----------] 4 tests from CalculatorTest (0 ms total)
           
[----------] Global test environment tear-down
[==========] 4 tests from 1 test suite ran. (0 ms total)
[  PASSED  ] 4 tests.

<?xml version="1.0" encoding="UTF-8"?>
<testsuites tests="5" failures="0" disabled="0" errors="0" time="0." timestamp="2024-07-01T17:04:42.890" name="AllTests">
  <testsuite name="CalculatorTest" tests="5" failures="0" disabled="0" skipped="0" errors="0" time="0." timestamp="2024-07-01T17:04:42.890">
    <testcase name="AddTest" file="calculatorTest.cpp" line="5" status="run" result="completed" time="0." timestamp="2024-07-01T17:04:42.890" classname="CalculatorTest" />
    <testcase name="SubtractTest" file="calculatorTest.cpp" line="12" status="run" result="completed" time="0." timestamp="2024-07-01T17:04:42.890" classname="CalculatorTest" />
    <testcase name="MultiplyTest" file="calculatorTest.cpp" line="19" status="run" result="completed" time="0." timestamp="2024-07-01T17:04:42.890" classname="CalculatorTest" />
    <testcase name="DivideTest" file="calculatorTest.cpp" line="26" status="run" result="completed" time="0." timestamp="2024-07-01T17:04:42.890" classname="CalculatorTest" />
    <testcase name="DivideTestByZero" file="calculatorTest.cpp" line="33" status="run" result="completed" time="0." timestamp="2024-07-01T17:04:42.890" classname="CalculatorTest" />
  </testsuite>
</testsuites>

// CalculatorTest.cpp  
#include "calculator.h"  
#include <gtest/gtest.h> 

double a_;
double b_;

class CalculatorTestWithFixture : public ::testing::Test {
protected:
  void SetUp() override {
    a_= 3;
    b_= 9;
  }
};

TEST_F(CalculatorTestWithFixture, AddTest) {  
    Calculator calc;
    calc.add(a_); 
    calc.add(b_);  
    EXPECT_EQ(calc.getresult(), 12);    
}  
  
TEST_F(CalculatorTestWithFixture, SubtractTest) {  
    Calculator calc;  
    calc.add(a_);
    calc.subtract(b_);
    EXPECT_EQ(calc.getresult(), 6);   
}  
  
TEST_F(CalculatorTestWithFixture, MultiplyTest) {  
    Calculator calc;  
    calc.add(a_);
    calc.multiply(b_);
    EXPECT_EQ(calc.getresult(), 27);   
}  
  
TEST_F(CalculatorTestWithFixture, DivideTest) {  
    Calculator calc;
    calc.add(a_);  
    calc.divide(b_);
    EXPECT_EQ(calc.getresult(), 3); 
}
    
TEST_F(CalculatorTestWithFixture, DivideTestByZero) { 
    Calculator calc;
    calc.add(0);  
    EXPECT_THROW({calc.divide(1);}, const char*);
}

./test
[==========] Running 5 tests from 1 test suite.
[----------] Global test environment set-up.
[----------] 5 tests from CalculatorTestWithFixture
[ RUN      ] CalculatorTestWithFixture.AddTest
[       OK ] CalculatorTestWithFixture.AddTest (0 ms)
[ RUN      ] CalculatorTestWithFixture.SubtractTest
[       OK ] CalculatorTestWithFixture.SubtractTest (0 ms)
[ RUN      ] CalculatorTestWithFixture.MultiplyTest
[       OK ] CalculatorTestWithFixture.MultiplyTest (0 ms)
[ RUN      ] CalculatorTestWithFixture.DivideTest
[       OK ] CalculatorTestWithFixture.DivideTest (0 ms)
[ RUN      ] CalculatorTestWithFixture.DivideTestByZero
[       OK ] CalculatorTestWithFixture.DivideTestByZero (0 ms)
[----------] 5 tests from CalculatorTestWithFixture (0 ms total)


[----------] Global test environment tear-down
[==========] 5 tests from 1 test suite ran. (0 ms total)
[  PASSED  ] 5 tests.

// CalculatorTest.cpp  
#include "calculator.h"  
#include <gtest/gtest.h> 

//Step1:申明一个呼叫参数类，该类主要用于TEST_P宏中实现的测试逻辑使用
class CallArgs{
public:
  CallArgs(double hasprama,double haspramb, double hasresult):
    _hasPrama(hasprama),_hasPramb(haspramb),_hasResult(hasresult){}

  double prama(){ return _hasPrama;} //_hasprama是减数
  double pramb(){ return _hasPramb;} //_haspramb是被减数，实现pramb - pram
  double result(){return _hasResult;} //_hasresult是期待结果

private:
  double _hasPrama;
  double _hasPramb;
  double _hasResult;
  
};

//Step2:申明一个呼叫类，该类同时也是TEST_P宏的第一个参数test_case_name
//该类继承了TestWithParam<CallArgs>模版类，从而使得CallArgs类与Call类进行了关联。
class CalculatorTestWithTestP:public ::testing::TestWithParam<CallArgs>
{
};

//Step3: 使用INSTANTIATE_TEST_CASE_P宏，对Call类进行类相关多个的参数设置
//这里使用参数生成器::testing::Values，GTest定义了了很多参数生成器。
//可以添加多大50个参数。
INSTANTIATE_TEST_CASE_P(VOIP, CalculatorTestWithTestP, ::testing::Values(
    CallArgs{7,5,2}, 
    CallArgs{5,7,-2},
    CallArgs{5,5,0}
));

//Step4: 编写了使用TEST_P宏实现的测试用例
//使用了TestWithParam<CallArgs>类的GetParam()接口获取参数CallArgs
//实际上这是三个测试用例，即该代码段会执行两个，参数分别为 ：CallArgs{7,5,2}, CallArgs{5,7,-2},CallArgs{5,5,0}
TEST_P(CalculatorTestWithTestP,BasicTest){
   CallArgs args = GetParam();
   Calculator calc;
   calc.add(args.pramb()); 
   calc.subtract(args.prama());  
   EXPECT_EQ(calc.getresult(), args.result());
}  

root@jerery-virtual-machine:/home/jerery/googletest-main/googletest/myworkspace/calculator_TEST_P# ./test
[==========] Running 3 tests from 1 test suite.
[----------] Global test environment set-up.
[----------] 3 tests from VOIP/CalculatorTestWithTestP
[ RUN      ] VOIP/CalculatorTestWithTestP.BasicTest/0
[       OK ] VOIP/CalculatorTestWithTestP.BasicTest/0 (0 ms)
[ RUN      ] VOIP/CalculatorTestWithTestP.BasicTest/1
[       OK ] VOIP/CalculatorTestWithTestP.BasicTest/1 (0 ms)
[ RUN      ] VOIP/CalculatorTestWithTestP.BasicTest/2
[       OK ] VOIP/CalculatorTestWithTestP.BasicTest/2 (0 ms)
[----------] 3 tests from VOIP/CalculatorTestWithTestP (0 ms total)


[----------] Global test environment tear-down
[==========] 3 tests from 1 test suite ran. (0 ms total)
[  PASSED  ] 3 tests.