Exception Had Been Thrown While Controller Extends RestController

[mcdanci]

According to the guide in README.md, I got the following Exception, while the controller extends RestController:

Use of undefined constant __EXT__ - assumed '__EXT__'
 ~\devhood\candy\s-candy\ThinkPHP\Library\Think\Controller\RestController.class.php:42
 ~\devhood\candy\s-candy\vendor\snowair\think-phpunit\Think\PhpUnit.php:54
 ~\devhood\candy\s-candy\vendor\snowair\think-phpunit\Think\PhpUnit.php:33
 ~\devhood\candy\s-candy\test\G3ControllerTest.php:27