def test__rangeListsameInterval_return_range(self):
listOfVal = [1, 1, 1]
stat = Statistics(listOfVal)
actual = stat.rangeList()
expected = 0
self.assertEqual(actual, expected)
def test_negativeMin_rangeList_return_range(self):
listOfVal = [-1, 2, 3, 4, 5]
stat = Statistics(listOfVal)
actual = stat.rangeList()
expected = 6
self.assertEqual(actual, expected)
def test_negativeMinMax_rangeList_return_range(self):
listOfVal = [-1, -2, -3, -4, -5]
stat = Statistics(listOfVal)
actual = stat.rangeList()
expected = 4
self.assertEqual(actual, expected)
def test_rangeList_return_none(self):
emptyList = []
stat = Statistics(emptyList)
actual = stat.rangeList()
expected = None
self.assertEqual(actual, expected)
