使用闭包的PHPUnit测试 [英] PHPUnit testing with closures

问题描述

这试图为一个类的方法编写一个测试，该方法调用了一个带有闭包的mock方法。你将如何验证被调用的闭包？

This came up trying to write a test for a method of a class that calls a mock method with a closure. How would you verify the closure being called?

我知道你可以断言该参数是 Closure 。

I know that you would be able to assert that the parameter is an instance of Closure. But how would you check anything about the closure?

例如，如何验证传递的函数：

For example how would you verify the function that is passed:

 class SUT {
     public function foo($bar) {
         $someFunction = function() { echo "I am an anonymous function"; };
         $bar->baz($someFunction);
     }
 }

 class SUTTest extends PHPUnit_Framework_TestCase {
     public function testFoo() {
         $mockBar = $this->getMockBuilder('Bar')
              ->setMethods(array('baz'))
              ->getMock();
         $mockBar->expects($this->once())
              ->method('baz')
              ->with( /** WHAT WOULD I ASSERT HERE? **/);

         $sut = new SUT();

         $sut->foo($mockBar);
     }
 }

您不能在PHP中比较两个闭包。在PHPUnit中有一种方法来执行传入的参数或以某种方式验证它？

You can't compare two closures in PHP. Is there a way in PHPUnit to execute the parameter passed in or in some way verify it?

推荐答案

将闭包插入到 SUT中：注入你的依赖（闭包），这使得单元测试更加困难， ：foo（）而不是在里面创建它，你会发现测试更容易。

Inject the closure into SUT::foo() instead of creating it inside there and you'll find testing much easier.

请记住我对你的真实代码一无所知，所以这对你来说可能是不切实际的）：

Here is how I would design the method (bearing in mind that I know nothing about your real code, so this may or may not be practical for you):

class SUT 
{
    public function foo($bar, $someFunction) 
    {
        $bar->baz($someFunction);
    }
}

class SUTTest extends PHPUnit_Framework_TestCase 
{
    public function testFoo() 
    {
        $someFunction = function() {};

        $mockBar = $this->getMockBuilder('Bar')
             ->setMethods(array('baz'))
             ->getMock();
        $mockBar->expects($this->once())
             ->method('baz')
             ->with($someFunction);

        $sut = new SUT();

        $sut->foo($mockBar, $someFunction);
    }
}

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