Zend: add interface inheriting enum interface implemented in class test

Author: Girgias

Zend/tests/inheritance/enum_only_interfaces_error_via_indirect_interface.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Interface that is extended from Enum only interface shouldn't be implementable by non-enum class
+--FILE--
+<?php
+interface I extends UnitEnum {}
+
+class C implements I {
+	public static function cases(): array {
+		return [];
+	}
+}
+
+?>
+--EXPECTF--
+Fatal error: Non-enum class C cannot implement interface UnitEnum in %s on line %d