用gtest实现数据驱动的单元测试

//使用gtest进行数据驱动的单元测试

#include <gtest/gtest.h>  
#include <iostream>
#include <vector>
#include <string>
#include <fstream>
#include "BuildAttrDesc.h"
using namespace std;
using namespace testing;
//定义一个结构体，用于保存输入数据和期望结果的对比数据
typedef struct
{
   string myString;
   string productId;
   string standardAttr;
   string customAttr;
   string resultsExpect;
   string attrValueExpect;
}datatype;
//把vector返回给TEST_P，然后由TEST_P来处理相关的数据
typedef ::std::vector<datatype> data;
static data vec;
//声明一个测试类，用来进行参数传递的类
/*
To write value-parameterized tests, first you should define a fixture class. 
It must be derived from both ::testing::Test and ::testing::WithParamInterface<T> (the latter is a pure interface), 
where T is the type of your parameter values. For convenience, you can just derive the fixture class from 
::testing::TestWithParam<T>, which itself is derived from both ::testing::Test and ::testing::WithParamInterface<T>. 
T can be any copyable type. If it's a raw pointer, you are responsible for managing the lifespan of the pointed values.
*/
class testBuildAttrDesc : public::testing::TestWithParam<datatype>{};

/*
The following class reads the envonrimental data from file "./dump_data/commodity_attribute_name_en","./dump_data/commodity_value_name_en", 
every row consisted of the input and expected output from file "./dump_data/product_attribute/standard_custom_expect_attr.txt" and then push them into the vector
*/
class Singleton
{ 
public:
    CBuildAttrDesc* m_pBuildAttrDesc;
    static Singleton* getInstance()
    {
        if(_instance==NULL) _instance=new Singleton();
            return _instance;
    }
    ~Singleton()
    {
        delete m_pBuildAttrDesc;
        m_pBuildAttrDesc = NULL;
    }
protected:
    Singleton()
    {
        datatype d;
        const string recordSeparator = "\001\003";
        const string fieldSeparator = "\001\002";
        string myString = "";
        string productId = "";
        string standardAttr = "";
        string customAttr = "";
        string resultsExpect = "";
        string attrValueExpect = "";
        vector<string> vStrArray;
        m_pBuildAttrDesc = new CBuildAttrDesc;
        m_pBuildAttrDesc->loadAttrNameValueMap("./dump_data/commodity_attribute_name_en","./dump_data/commodity_value_name_en", recordSeparator, fieldSeparator);
        if (!m_pBuildAttrDesc->initOk())
        {
            cout<<"CBuildAttrDesc init failed!"<<endl;
            exit(1);
        }else
            cout<<endl<<"sucess: Open files commodity_attribute_name_en.dump and commodity_value_name_en.dump"<<endl<<endl;
        ifstream inData("./dump_data/product_attribute/standard_custom_expect_attr.txt");//open the input files
        while(getline(inData, myString))
        {
            m_pBuildAttrDesc->splitStr(myString, "", vStrArray);
            if(5 != vStrArray.size())//total have five segments
            {
            cout<<"Format Error(the total record): "<<myString<<endl;
            continue;
            }
            d.productId = vStrArray[0];
            d.standardAttr = vStrArray[1];
            d.customAttr = vStrArray[2];
            d.resultsExpect = vStrArray[3];
            d.attrValueExpect = vStrArray[4];
            if(m_pBuildAttrDesc->isDigits(d.productId)==false)
            {
             cout<<"Format Error(the product id): "<<d.productId<<endl;
             continue;
            }
            cout<<endl<<"product id:     "<<d.productId<<endl;
            cout<<endl<<"standardAttr:   "<<d.standardAttr<<endl;
            cout<<endl<<"customAttr:     "<<d.customAttr<<endl;
            cout<<endl<<"resultsExpect:  "<<d.resultsExpect<<endl;
            cout<<endl<<"attrValueExpect:"<<d.attrValueExpect<<endl;
            vec.push_back(d);
         }
    }
private:
        static Singleton *_instance;
};
Singleton* Singleton::_instance = NULL ;
Singleton *single=Singleton::getInstance();


/*
Then, use the TEST_P macro to define as many test patterns using this fixture as you want. The _P suffix is for 
"parameterized" or "pattern", whichever you prefer to think.
*/
TEST_P(testBuildAttrDesc,HandleTrueReturn)
{
    datatype n = GetParam();
    string results = "";
    string attrValue = "";
    // expected test
    single->m_pBuildAttrDesc->getAttrDesc(n.standardAttr,n.customAttr,results,attrValue);
    cout<<n.standardAttr<<endl<<n.customAttr<<endl<<results<<endl<<attrValue<<endl;
    EXPECT_STREQ(n.resultsExpect.c_str(),results.c_str());
    EXPECT_STREQ(n.attrValueExpect.c_str(),attrValue.c_str());
}
/*
Finally, you can use INSTANTIATE_TEST_CASE_P to instantiate the test case with any set of parameters you want. Google Test 
defines a number of functions for generating test parameters. They return what we call (surprise!) parameter generators. 
Here is a summary of them, which are all in the testing namespace:
*/
INSTANTIATE_TEST_CASE_P(TrueReturn,testBuildAttrDesc,::testing::ValuesIn(vec));

int main(int argc,char *argv[])
{
    testing::InitGoogleTest(&argc,argv);
    RUN_ALL_TESTS();
    delete single;
    return 0;
}

　　

gtest官方关于数据驱动单元测试的文档
http://code.google.com/p/googletest/wiki/AdvancedGuide