Verify XPClass::isEnum()

Author: thekid

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

@@ -7,6 +7,11 @@
 #[Action(eval: 'new VerifyThat(fn() => function_exists("enum_exists"))')]
 class EnumTest extends EmittingTest {
 
+  #[Test]
+  public function enum_type() {
+    Assert::true($this->type('enum <T> { }')->isEnum());
+  }
+
   #[Test]
   public function name_property() {
     $t= $this->type('enum <T> {