def test_example(self):
"""Test the example given in problem"""
argument = [1, 2, 3]
expected = [0, 2, 4]
dp.double_preceding(argument)
self.assertEqual(expected, argument,
"This test is a given.")
def test_single(self):
"""Test a singular list"""
argument = [4]
expected = [0]
dp.double_preceding(argument)
self.assertEqual(expected, argument,
"The list has a single value.")
def test_identical(self):
"""Test a list with multiple identical values"""
argument = [1, 1, 1]
expected = [0, 2, 2]
dp.double_preceding(argument)
self.assertEqual(expected, argument,
"The list has multiple identical values.")
def test_empty(self):
"""Test an empty list"""
argument = []
expected = []
dp.double_preceding(argument)
self.assertEqual(expected, argument,
"The list is empty.")
