Support namespace style PHPUnit MockObject Stub

[ytetsuro]

I encountered the following error.

TypeError: Return value of Mock_Hoge_fetcher_7b0f1a88::fetch() must be an instance of Hoge_response_object, instance of PHPUnit\Framework\MockObject\Stub\Exception returned

This error occurs because phpunit-mock-objects is renewed.

Relation links 👇.

• Fix to be able to set phpunit-mock-objects stub to the return value of method #170 (comment)
• https://github.com/sebastianbergmann/phpunit-mock-objects/blob/master/src/Stub.php

Test:

• Support namespace style PHPUnit MockObject. ci-app-for-ci-phpunit-test#22

[ytetsuro]

Is the following code better?

if (! class_exists('PHPUnit_Framework_MockObject_Stub'))
{
    class_alias('PHPUnit\Framework\MockObject\Stub', 'PHPUnit_Framework_MockObject_Stub');
}

[coveralls]

Coverage remained the same at 56.044% when pulling 2ce1c13 on ytetsuro:patch-2 into 14960d3 on kenjis:master.