Add a forgotten test

Signed-off-by: Deven Bansod <devenbansod.bits@gmail.com>

Author: devenbansod

tests/Parser/SelectStatementTest.php

@@ -60,6 +60,7 @@ public function testSelectProvider()
             array('parser/parseSelectEndOptions1'),
             array('parser/parseSelectEndOptions2'),
             array('parser/parseSelectEndOptionsErr'),
+            array('parser/parseSelectUnion'),
         );
     }
 }