def test_false_19(self):
     self.assertFalse(signed_eight_bit_number("+1"))
 def test_false_20(self):
     self.assertFalse(signed_eight_bit_number("--1"))
 def test_false_18(self):
     self.assertFalse(signed_eight_bit_number("1\n2"))
 def test_true(self):
     self.assertTrue(signed_eight_bit_number("0"))
 def test_false_8(self):
     self.assertFalse(signed_eight_bit_number("-999"))
 def test_false_5(self):
     self.assertFalse(signed_eight_bit_number("128"))
 def test_false_4(self):
     self.assertFalse(signed_eight_bit_number("042"))