def test_it_raises_an_error_when_count_isnt_a_positive_integer(self):
with self.assertRaises(ValueError):
exponential_buckets(start=100, factor=2, count=0)
with self.assertRaises(ValueError):
exponential_buckets(start=100, factor=2, count=-1)
def test_it_generates_an_exponential_series(self):
buckets = exponential_buckets(start=100.0, factor=2, count=5)
self.assertEqual(
buckets, [100.0, 200.0, 400.0, 800.0, 1600.0, INFINITY]
)
def test_it_raises_an_error_when_factor_le_1(self):
for factor in [1, 0, -1]:
with self.assertRaises(ValueError):
exponential_buckets(start=100, factor=factor, count=10)
def test_generated_buckets_length(self):
count = 5
buckets = exponential_buckets(start=100.0, factor=2, count=count)
self.assertEqual(len(buckets), count + 1)
def test_it_raises_an_error_when_start_is_negative(self):
with self.assertRaises(ValueError):
exponential_buckets(start=-10, factor=2, count=100)