def test_update_adds_N(self):
ewma = EWMA.one_minute()
ewma.update(42)
self.assertEqual(ewma._uncounted, 42)
def test_tick_sets_uninitialized_rate(self):
ewma = EWMA.one_minute()
ewma.update(3)
ewma.tick()
self.assertEqual(ewma.rate, 3 / 5.0)
def test_one_minute_sets_alpha(self):
one_minute = EWMA.one_minute()
self.assertAlmostEqual(one_minute._alpha, 0.07996, 5)
