Where to dig to get acquainted with unit testing in Yii2?

Question

Yii

I am getting acquainted with Yii2 and at the same time with unit testing.
I installed Yii on the dock from the website. But the tests folder is not there. Please tell me where to dig in order to get acquainted with unit tests in Yii2?
A big request to prompt or reset the dock in Russian, I'm not friends with English.

Answer 1

If installed via composer, then it should not be.
Clone the repository https://github.com/yiisoft/yii2

Answer 2

I am not friendly with English.

Then you need 1C. Yii2 in Russian only on the forum in the form of responses from visitors.

Answer 3

des1roer.blogspot.com/2016/03/yii-2-codeception.html