Add test for inexistent constants

Author: iluuu1994

ext/reflection/tests/ReflectionConstant_inexistent.phpt

@@ -0,0 +1,14 @@
+--TEST--
+ReflectionConstant on inexistent constant
+--FILE--
+<?php
+
+try {
+    new \ReflectionConstant('C');
+} catch (Exception $e) {
+    echo get_class($e) . ': ' . $e->getMessage() . "\n";
+}
+
+?>
+--EXPECT--
+ReflectionException: Constant "C" does not exist