def test_sum_cons_equivalence(self):
"""Test equivalence of sum_consecutive_nums, to subtracting two
partial sums."""
k = 7
n = 40
result = seriesutils.sum_consecutive_nums(k,n)
partial_difference = seriesutils.partial_sum(n) - seriesutils.partial_sum(k-1)
self.assertEqual(partial_difference, result)
def test_sum_cons_diff(self):
self.assertEqual(15, seriesutils.sum_consecutive_nums(1,5))
self.assertEqual(55, seriesutils.sum_consecutive_nums(1,10))
def test_sum_cons_same(self):
self.assertEqual(0, seriesutils.sum_consecutive_nums(0,0))
self.assertEqual(10, seriesutils.sum_consecutive_nums(10,10))