phpunit-master test unit library

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<?php  
    class StackTest extends PHPUnit_Framework_TestCase  
    {  
        public function testEmpty()  
        {  
            $stack = array();  
            $this->assertEmpty($stack);  
            return $stack;  
        }  
        /** 
          * @depends testEmpty 
          */  
        public function testPush(array $stack)  
        {  
            array_push($stack, 'foo');  
            $this->assertEquals('foo', $stack[count($stack)-1]);  
            $this->assertNotEmpty($stack);  
            return $stack;  
        }  
        /** 
          * @depends testPush 
          */  
        public function testPop(array $stack)  
        {  
            $this->assertEquals('foo', array_pop($stack));  
            $this->assertEmpty($stack);  
        }  
    }                         
    ?>

1. What is unit testing?

[Baidu Encyclopedia] Unit testing is to check and verify the smallest testable unit in the software.

is a small piece of code written by the developer to check whether a small, clear function of the code under test is correct.

2. What is its function?

【Nonsense】Check the feasibility and stability of software and programs.

Unit testing can avoid repeated and redundant problems during iteration, upgrade, etc. processes.

Avoid affecting your logic when others modify the code

3. Which programs require unit testing (PHP)?

[Ideal] The ideal unit test should cover all possible paths in the program, including correct and incorrect paths. A unit test usually covers a specific path in a function or method.

[Reality] Functions in model, helper, and controller must be tested and the paths cover all possibilities

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