https://github.com/yiisoft/yii2/commit/e2513de6c6207fa37894a944e10b8cd420ac6804#commitcomment-3192244

"YiiRequirementChecker::check()" has been updated to be able to collect different requirements set in the chained call.

as discussed in #203
https://github.com/yiisoft/yii2/issues/203#issuecomment-17759631

Methods "YiiRequirementChecker::getResults()" and "YiiRequirementChecker::render()" have been added.

change is to avoid random test failure on race condition.
fixes #203 #231

- rename requireApp() to mockApplication()
- always destroy app on tearDown()
  - eliminates need for constant YII_DESTROY_APP_ON_TEARDOWN
  - mockApplication() becomes a lot easier. Destroying app on each tearDown
    means creating it on every call is fine. No more checking if it already
    exists and if it has been created from the same config.
- \yii::$app should have been \Yii::$app

In contrast to php function basename() It that always uses \ and /
as directory separator.
It is needed for use on Classnames that contain namespaces.
Fixes #192

it echoed Yii version which is not necessary

Appended newlines to every PHP document that did not have a newline as the last character in the file.

Otherwise it throws an exception that "Object of class ClassName
could not be converted to string"