/** @title null instanceof String */
 public void testN2() {
   T_instance_of_1 t = new T_instance_of_1();
   assertFalse(t.run(null));
 }
 /** @title T_instance_of_1 instanceof String */
 public void testE1() {
   T_instance_of_1 t = new T_instance_of_1();
   assertFalse(t.run(t));
 }
 /** @title (Object)String instanceof String */
 public void testN1() {
   T_instance_of_1 t = new T_instance_of_1();
   String s = "";
   assertTrue(t.run(s));
 }