The reason why singleton is a “problem” with PHPUnit

So we add to our test:

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class FooTest extends PHPUnit_Framework_TestCase { ...     public function tearDown()     {         Foo::tearDown();     } }

And now we implement the tearDown function in our Foo Class

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public static function tearDown() {     static::$instance = NULL; }

refer : http://gonzalo123.com/2012/09/24/the-reason-why-singleton-is-a-problem-with-phpunit/