def test_calc_mem_used():
# should be able to send at least 100 fps at 1024 bytes
assert calc_mem_used(1, 1024) < 512000
# should use less memory at 64 than 1024
assert calc_mem_used(1, 64) < calc_mem_used(1, 1024)
# should use less memory with 1 stream than 100 streams
assert calc_mem_used(1, 1024) < calc_mem_used(1000, 1024)
def test_check_mem():
# starting with 0 confidence should always return 0 confidence
assert check_mem(100000, 1, 64, Confidence(0.0)).percent == 0.0
# huge mem should have no effect on confidence
assert check_mem(1e10, 1, 64, Confidence(99.0)).percent == 99.0
assert check_mem(1e10, 1000, 8192, Confidence(62.0)).percent == 62.0
# oversubscribed means no confidence
assert check_mem(calc_mem_used(1, 1024) - 1, 1, 1024,
Confidence(100.0)).percent == 0.0
# undersubscribed means no change to confidence
assert check_mem(calc_mem_used(1, 1024)*2, 1, 1024,
Confidence(75.0)).percent == 75.0
# in the middle means scaling confidence
scaled_confidence = check_mem(calc_mem_used(1, 1024) /
((1 + SAFETY_FACTOR) / 2),
1, 1024, Confidence(100.0)).percent
assert round(scaled_confidence, 2) == 50.0
def test_check_mem_reasons():
# starting with a reason should return that reason (maybe with additions)
assert "foo" in check_mem(5000000, 1, 64, Confidence(reason="foo")).reason
assert "foo" in check_mem(0, 1, 64, Confidence(reason="foo")).reason
# huge mem should have no effect on reason
assert check_mem(1e10, 1, 64, Confidence(99.0, "foo")).reason == "foo"
assert check_mem(1e10, 1000, 8192, Confidence(62.0, "foo")).reason == "foo"
# oversubscribed means no confidence and a reason
reason = check_mem(calc_mem_used(1, 1024) - 1, 1, 1024,
Confidence()).reason
assert "memory" in reason
# undersubscribed means no effect on reason
assert check_mem(calc_mem_used(1, 1024)*2, 1, 1024,
Confidence(75.0, "foo")).reason == "foo"
# in the middle means a reason
scaled_reason = check_mem(calc_mem_used(1, 1024) /
((1 + SAFETY_FACTOR) / 2),
1, 1024, Confidence()).reason
assert "memory" in scaled_reason