def test_returns_empty_list_for_argument_zero(self):
"""
Returns an empty list if the argument is lesser-than-or-equal-to
zero
"""
result = find_grey_code_bits(0)
self.assertEqual(result, [])
def test_returns_list_for_large_bit_num(self):
"""
Returns the correct list for input integer 4
"""
final_list = [
"0000", "0001", "0011", "0111", "1111", "1110", "1100", "1000"
]
result = find_grey_code_bits(4)
self.assertEqual(result, final_list)
def test_returns_none_if_argument_not_integer(self):
"""
Returns None if the argument passed in is not an integer
"""
result = find_grey_code_bits("test")
self.assertIsNone(result)
def test_returns_list_for_small_bit_num(self):
"""
Returns a list of length 2 with [0, 1]
"""
result = find_grey_code_bits(2)
self.assertEqual(result, ["00", "01", "11", "10"])
def test_returns_list_for_one_bit(self):
"""
Returns a list of ["0", "1"] for argument of 1
"""
result = find_grey_code_bits(1)
self.assertEqual(result, ["0", "1"])