def test_count_th_empty(self):
self.word = ""
count = count_th(self.word)
self.assertEqual(0, count)
def test_count_th_mixedcase(self):
self.word = "THtHThth"
count = count_th(self.word)
self.assertEqual(1, count)
def test_count_th_multiple(self):
self.word = "abcthefthghith"
count = count_th(self.word)
self.assertEqual(3, count)
def test_count_backwards(self):
self.word = "thhtthht"
count = count_th(self.word)
self.assertEqual(2, count)
def test_count_th_single(self):
self.word = "abcthxyz"
count = count_th(self.word)
self.assertEqual(1, count)
