GoogleTest单元测试使用2

简介

单元测试(Unit Test)是对软件基本组成单元(如函数或是一个类的方法)进行的测试，是开发者编写的一小段代码，用于检验被测试代码一个很小的、很明确的功能是否正确。
在gtest中，一个测试用例(test case)可以包含一个或多个测试。一个测试程序可以包含多个测试用例。

一个较完整的 googletest 单元测试实例

Configure.h

#pragma once

#include <string> 
#include <vector> 
#include <iostream>
#include <gtest/gtest.h>

 class Configure 
 { 
 private: 
    std::vector<std::string> vItems; 

 public: 
    int addItem(std::string str); 

    std::string getItem(int index); 

    int getSize(); 
 }; 

Configure.cpp

 #include <algorithm> 
 #include "configure.h"

 /** 
 * @brief Add an item to configuration store. Duplicate item will be ignored 
 * @param str item to be stored 
 * @return the index of added configuration item 
 */ 
 int Configure::addItem(std::string str) 
 { 
    std::vector<std::string>::const_iterator vi=std::find(vItems.begin(), vItems.end(), str); 
    if (vi != vItems.end()) 
        return vi - vItems.begin(); 

    vItems.push_back(str);
    return vItems.size() - 1; 
 } 

 /** 
 * @brief Return the configure item at specified index. 
 * If the index is out of range, "" will be returned 
 * @param index the index of item 
 * @return the item at specified index 
 */ 
 std::string Configure::getItem(int index) 
 { 
    if (index >= vItems.size()) 
        return ""; 
    else 
        return vItems.at(index); 
 } 

 /// Retrieve the information about how many configuration items we have had 
 int Configure::getSize() 
 { 
    return vItems.size(); 
 } 

main.cc

 #include <gtest/gtest.h> 
 #include "configure.h"

 TEST(ConfigureTest, addItem) 
 { 
    // do some initialization 
    Configure* pc = new Configure(); 
    
    // validate the pointer is not null 
    ASSERT_TRUE(pc != NULL); 

    // call the method we want to test 
    pc->addItem("A"); 
    pc->addItem("B"); 
    pc->addItem("A"); 

    // validate the result after operation 
    EXPECT_EQ(pc->getSize(), 2); 
    EXPECT_STREQ(pc->getItem(0).c_str(), "A"); 
    EXPECT_STREQ(pc->getItem(1).c_str(), "B"); 
    EXPECT_STREQ(pc->getItem(10).c_str(), ""); 

    delete pc; 
}

int main()
{
    testing::InitGoogleTest();
 
    return RUN_ALL_TESTS();
}