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from pg_autoscaler import effective_target_ratio
from pytest import approx
def check_simple_ratio(target_ratio, tot_ratio):
etr = effective_target_ratio(target_ratio, tot_ratio, 0, 0)
assert (target_ratio / tot_ratio) == approx(etr)
return etr
def test_simple():
etr1 = check_simple_ratio(0.2, 0.9)
etr2 = check_simple_ratio(2, 9)
etr3 = check_simple_ratio(20, 90)
assert etr1 == approx(etr2)
assert etr1 == approx(etr3)
etr = check_simple_ratio(0.9, 0.9)
assert etr == approx(1.0)
etr1 = check_simple_ratio(1, 2)
etr2 = check_simple_ratio(0.5, 1.0)
assert etr1 == approx(etr2)
def test_total_bytes():
etr = effective_target_ratio(1, 10, 5, 10)
assert etr == approx(0.05)
etr = effective_target_ratio(0.1, 1, 5, 10)
assert etr == approx(0.05)
etr = effective_target_ratio(1, 1, 5, 10)
assert etr == approx(0.5)
etr = effective_target_ratio(1, 1, 0, 10)
assert etr == approx(1.0)
etr = effective_target_ratio(0, 1, 5, 10)
assert etr == approx(0.0)
etr = effective_target_ratio(1, 1, 10, 10)
assert etr == approx(0.0)
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