Verify cases() for backed enums

Author: thekid

src/test/php/lang/ast/unittest/emit/EnumTest.class.php

@@ -29,7 +29,7 @@ public static function run() {
   }
 
   #[Test]
-  public function cases_method() {
+  public function cases_method_for_unit_enums() {
     $t= $this->type('enum <T> {
       case Hearts;
       case Diamonds;
@@ -43,6 +43,21 @@ public function cases_method() {
     );
   }
 
+  #[Test]
+  public function cases_method_for_backed_enums() {
+    $t= $this->type('enum <T>: string {
+      case Hearts = "♥";
+      case Diamonds = "♦";
+      case Clubs = "♣";
+      case Spades = "♠";
+    }');
+
+    Assert::equals(
+      ['Hearts', 'Diamonds', 'Clubs', 'Spades'],
+      array_map(function($suit) { return $suit->name; }, $t->getMethod('cases')->invoke(null))
+    );
+  }
+
   #[Test]
   public function cases_method_does_not_yield_constants() {
     $t= $this->type('enum <T> {