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Add readonly class tests and remove unnecessary tests

Author: rodrigoprimo

src/Standards/Generic/Tests/NamingConventions/AbstractClassNamePrefixUnitTest.1.inc

@@ -56,6 +56,8 @@ abstract class abstractOkCaseOfPrefixIsNotEnforced
 
 final class FinalClassShouldNotTriggerWarning {}
 
-class ChildClassShouldNotTriggerWarning extends AbstractClassName {}
+readonly class ReadonlyClassShouldNotTriggerWarning {}
 
-class ClassImplementingInterfaceShouldNotTriggerWarning implements InterfaceName {}
+abstract readonly class AbstractReadonlyClassWithPrefixShouldNotTriggerWarning {}
+
+abstract readonly class ReadonlyAbstractClassShouldTriggerWarningWhenPrefixIsMissing {}

src/Standards/Generic/Tests/NamingConventions/AbstractClassNamePrefixUnitTest.php

@@ -39,6 +39,7 @@ public function getErrorList($testFile='')
                 18 => 1,
                 23 => 1,
                 42 => 1,
+                63 => 1,
             ];
         default:
             return [];