Yii2codeceptunit class not found

My test code is as follows {code ...} the following error occurs during execution: {code ...} for the code below, refer to the official {code ...} where is my problem? Thank you for your advice. My test code is as follows:

   1,            'channel_id' => 2,        ];        $this->assertTrue(UserSource::recordUserReg($params));    }}

The following error occurs during execution:

Unit Tests (1) --------------------------------------------------------------------------E UserSourceUintTest: Me -----------------------------------------------------------------------------------------Time: 40 ms, Memory: 6.00MBThere was 1 error:---------1) UserSourceUintTest: Me Test  tests/unit/UserSourceUintTest.php:testMe                                                     [Error] Class 'app\models\UserSource' not found                                                     #1  UserSourceUintTest->testMeERRORS!Tests: 1, Assertions: 0, Errors: 1.

Refer to the official

Classical Unit TestingUnit tests in Codeception are written in absolutely the same way as it is done in PHPUnit:
  username = null;        $this->assertFalse($user->validate(['username']));        $user->username = 'toolooooongnaaaaaaameeee';        $this->assertFalse($user->validate(['username']));        $user->username = 'davert';        $this->assertTrue($user->validate(['username']));               }}

Where is my problem? Thank you for your advice.

Reply content:

My test code is as follows:

   1,            'channel_id' => 2,        ];        $this->assertTrue(UserSource::recordUserReg($params));    }}

The following error occurs during execution:

Unit Tests (1) --------------------------------------------------------------------------E UserSourceUintTest: Me -----------------------------------------------------------------------------------------Time: 40 ms, Memory: 6.00MBThere was 1 error:---------1) UserSourceUintTest: Me Test  tests/unit/UserSourceUintTest.php:testMe                                                     [Error] Class 'app\models\UserSource' not found                                                     #1  UserSourceUintTest->testMeERRORS!Tests: 1, Assertions: 0, Errors: 1.

Refer to the official

Classical Unit TestingUnit tests in Codeception are written in absolutely the same way as it is done in PHPUnit:
  username = null;        $this->assertFalse($user->validate(['username']));        $user->username = 'toolooooongnaaaaaaameeee';        $this->assertFalse($user->validate(['username']));        $user->username = 'davert';        $this->assertTrue($user->validate(['username']));               }}

Where is my problem? Thank you for your advice.