def test_space_symbol(self):
     self.assertEqual(strip(" text ", " "), "text")
 def test_both_sides(self):
     self.assertEqual(strip("_text_", "_"), "text")
 def test_several_char(self):
     self.assertEqual(strip("____text_", "_"), "text")
 def test_middle_char(self):
     self.assertEqual(strip("_te_xt_", "_"), "te_xt")
 def test_neither(self):
     self.assertEqual(strip(" _text_ ", "_"), " _text_ ")
 def test_only_left(self):
     self.assertEqual(strip("_text ", "_"), "text ")
 def test_only_right(self):
     self.assertEqual(strip(" text_", "_"), " text")