AssertRegExpRectorTest: add broken test on static method call

[gnutix]

Could not reproduce in a demo set however ('guessing because there's no real PHPUnit in there) : https://getrector.org/demo/011085dd-1266-4a33-a8a9-44e355f9f709#result

Fails with error :

 [ERROR] Could not process "File.php" file, due to:     
         "Pick more specific node than "PhpParser\Node\Expr\StaticCall"".                                                                        

I had the exact same error happen from these Rectors on my code base :

• Rector\PHPUnit\Rector\SpecificMethod\AssertTrueFalseToSpecificMethodRector
• Rector\PHPUnit\Rector\SpecificMethod\AssertFalseStrposToContainsRector
• Rector\PHPUnit\Rector\SpecificMethod\AssertPropertyExistsRector

I guess the issue is the same, so I won't try to add tests for them all. We'll see later once a fix comes out if they still fail.

[TomasVotruba]

Same as previous PR

[gnutix]

There is still the same issue on my code base with these two Rectors :

• Rector\PHPUnit\Rector\SpecificMethod\AssertFalseStrposToContainsRector
• Rector\PHPUnit\Rector\SpecificMethod\AssertPropertyExistsRector

[TomasVotruba]

Possibly similar solution might be applied. Look at stack trace, before going into getName()