All About Mocking with PHPUnit | Envato Tuts+

There are two styles of testing: "black box" and "white box" styles. Black box testing focuses on the object's state; whereas, white box testing focuses on behavior. The two styles complement each other and can be combined to thoroughly test code. Mocking allows us to test behavior, and this tutorial combines the mocking concept with TDD to build an example class that uses several other components

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expect($this->at(index))で回数でメソッドの挙動かえる