def test_permutations_float(self):
"""permutations should use gamma function when floats as input"""
self.assertFloatEqual(permutations(1.0,1), 1)
self.assertFloatEqual(permutations(2,1.0), 2)
self.assertFloatEqual(permutations(3.0,1.0), 3)
self.assertFloatEqual(permutations(4.0,1), 4)
self.assertFloatEqual(permutations(4.0,2.0), 12)
self.assertFloatEqual(permutations(4.0,3.0), 24)
self.assertFloatEqual(permutations(4,4.0), 24)
self.assertFloatEqual(permutations(300, 100), 3.8807387193009318e+239)
def test_permutations(self):
"""permutations should return expected results"""
self.assertEqual(permutations(1,1), 1)
self.assertEqual(permutations(2,1), 2)
self.assertEqual(permutations(3,1), 3)
self.assertEqual(permutations(4,1), 4)
self.assertEqual(permutations(4,2), 12)
self.assertEqual(permutations(4,3), 24)
self.assertEqual(permutations(4,4), 24)
self.assertFloatEqual(permutations(300, 100), 3.8807387193009318e+239)
def test_permutations_range(self):
"""permutations should increase gradually with increasing k"""
start = 5 #permuations(10,5) = 30240
end = 6 #permutations(10,6) = 151200
step = 0.1
lower_lim = 30240
upper_lim = 151200
previous_value = 30239.9999
while start <= end:
obs = permutations(10,start)
assert lower_lim <= obs <= upper_lim
assert obs > previous_value
previous_value = obs
start += step
