def test_next(self):
"""A test of the next method of the JavaLikeScanner class."""
scanner = JavaLikeScanner("one two three\nfour\tfive six\t")
self.assertEqual(scanner.next(), "one")
self.assertEqual(scanner.next(), "two")
self.assertEqual(scanner.next(), "three")
self.assertEqual(scanner.next(), "four")
self.assertEqual(scanner.next(), "five")
self.assertEqual(scanner.next(), "six")
self.assertEqual(scanner.next(), None)
scanner = JavaLikeScanner("seven eight\t\tnine\n\t ten\n\t \t")
self.assertEqual(scanner.next(), "seven")
self.assertEqual(scanner.next(), "eight")
self.assertEqual(scanner.next(), "nine")
self.assertEqual(scanner.next(), "ten")
self.assertEqual(scanner.next(), None)
self.assertEqual(scanner.contents, "\n\t \t")
scanner = JavaLikeScanner("")
self.assertEqual(scanner.next(), None)
