- TestHelper.assertTrue (null != bt.lookup ('a'));
- TestHelper.assertTrue (null != bt.lookup ('b'));
- TestHelper.assertTrue (null != bt.lookup ('c'));
- TestHelper.assertTrue (null != bt.lookup ('d'));
- TestHelper.assertTrue (null != bt.lookup ('e'));
-
- TestHelper.assertTrue (null != bt.remove ('a'));
- TestHelper.assertTrue (null != bt.remove ('b'));
- TestHelper.assertTrue (null != bt.remove ('c'));
- TestHelper.assertTrue (null != bt.remove ('d'));
- TestHelper.assertTrue (null != bt.remove ('e'));
-
- TestHelper.assertFalse (null != bt.remove ('a'));
- TestHelper.assertFalse (null != bt.remove ('b'));
- TestHelper.assertFalse (null != bt.remove ('c'));
- TestHelper.assertFalse (null != bt.remove ('d'));
- TestHelper.assertFalse (null != bt.remove ('e'));
-
- TestHelper.assertTrue (null == bt.lookup ('a'));
- TestHelper.assertTrue (null == bt.lookup ('b'));
- TestHelper.assertTrue (null == bt.lookup ('c'));
- TestHelper.assertTrue (null == bt.lookup ('d'));
- TestHelper.assertTrue (null == bt.lookup ('e'));
+ assertNotNull(bt.lookup('a'));
+ assertNotNull(bt.lookup('b'));
+ assertNotNull(bt.lookup('c'));
+ assertNotNull(bt.lookup('d'));
+ assertNotNull(bt.lookup('e'));
+
+ assertNotNull(bt.remove('a'));
+ assertNotNull(bt.remove('b'));
+ assertNotNull(bt.remove('c'));
+ assertNotNull(bt.remove('d'));
+ assertNotNull(bt.remove('e'));
+
+ assertNull(bt.remove('a'));
+ assertNull(bt.remove('b'));
+ assertNull(bt.remove('c'));
+ assertNull(bt.remove('d'));
+ assertNull(bt.remove('e'));
+
+ assertNull(bt.lookup('a'));
+ assertNull(bt.lookup('b'));
+ assertNull(bt.lookup('c'));
+ assertNull(bt.lookup('d'));
+ assertNull(bt.lookup('e'));