def test_equal_2(self): self.assertEqual(first_non_repeating_letter('stress'), 't')
def test_equal_10(self): self.assertEqual(first_non_repeating_letter( "Go hang a salami, I'm a lasagna hog!"), ',')
def test_equal_1(self): self.assertEqual(first_non_repeating_letter('a'), 'a')
def test_equal_8(self): self.assertEqual(first_non_repeating_letter('hello world, eh?'), 'w')
def test_equal_9(self): self.assertEqual(first_non_repeating_letter('sTreSS'), 'T')
def test_equal_3(self): self.assertEqual(first_non_repeating_letter('moonmen'), 'e')
def test_equal_7(self): self.assertEqual(first_non_repeating_letter('~><#~><'), '#')
def test_equal_10(self): self.assertEqual( first_non_repeating_letter("Go hang a salami, I'm a lasagna hog!"), ',')