Add more options to enum doubles

Author: remipelhate

src/PHPUnit/Doubles/Enums/IntBackedEnum.php

@@ -9,4 +9,5 @@ enum IntBackedEnum: int
     case One = 1;
     case Two = 2;
     case Three = 3;
+    case Four = 4;
 }

src/PHPUnit/Doubles/Enums/StringBackedEnum.php

@@ -9,4 +9,5 @@ enum StringBackedEnum: string
     case One = 'One';
     case Two = 'Two';
     case Three = 'Three';
+    case Four = 'Four';
 }

src/PHPUnit/Doubles/Enums/UnitEnum.php

@@ -9,4 +9,5 @@ enum UnitEnum
     case One;
     case Two;
     case Three;
+    case Four;
 }