Simple unit testing idea

Hello everyone , I meet you again , I'm the king of the whole stack , I wish every programmer can learn more languages .

A project is composed of many modules , When we finish one module at a time , You should test whether the function It can be executed correctly . Then write a module , Don't wait for all modules to be written before overall testing , It will be very

Difficult to find the problem （ Except for Masters ）.

So as a project t , Writing test cases is a major skill . How to write test cases ？

In fact, I use my own module , See whether the implementation result is consistent with the expected result .

For example, the following , Wrote a add function , To test it , Let's write a test_add function .

#include <stdio.h>
int add(int a,int b)
{
	return a+b;
}

int test_add(void)
{
	int ret = 0;
	ret = add(1,1);
	if(ret != 2)
	{
		return 1;
	}
	ret = add(2,2);
	if(ret != 4 )
	{
		return 2;
	}
	ret = add(3,3);
	if(ret != 6 )
	{
		return 3;
	}
	return 0;
}
int main()
{
	int ret = 0;
	ret = test_add();
	if(ret != 0)
	{
		// Here, the return value is used to determine which test is wrong .
		printf("test failed,ret = %d\n",ret);
	}
	else
	{
		printf("test ok!");
	}
}

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Of course, you can also use some open source test code , Here are two simple language unit testing frameworks .

example cutest , ordinary c Unit testing See link http://pan.baidu.com/s/1hqeg7qO

CUnit: It is provided to users in the form of static library , When users write code, they can directly link to this static library . It provides a simple unit testing framework , And it provides rich assertion statement support for frequently used data types . See link http://pan.baidu.com/s/1gd9WCgV

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