Add a testcase for Enum using traits having constants

Author: sj-i

Zend/tests/enum/traits-constants.phpt

@@ -0,0 +1,33 @@
+--TEST--
+Enum can use traits having constants
+--FILE--
+<?php
+
+trait Rectangle {
+    private const MESSAGE_RECTANGLE = 'Rectangle';
+
+    public function shape(): string {
+        return self::MESSAGE_RECTANGLE;
+    }
+}
+
+enum Suit {
+    use Rectangle;
+
+    case Hearts;
+    case Diamonds;
+    case Clubs;
+    case Spades;
+}
+
+echo Suit::Hearts->shape() . PHP_EOL;
+echo Suit::Diamonds->shape() . PHP_EOL;
+echo Suit::Clubs->shape() . PHP_EOL;
+echo Suit::Spades->shape() . PHP_EOL;
+
+?>
+--EXPECT--
+Rectangle
+Rectangle
+Rectangle
+Rectangle