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"""
This module contains regression tests regarding the issue of unstable return values from the `digest` function.
The tests ensure that the `digest` function consistently returns the expected output for given inputs.
For more context and a detailed discussion of the problem, refer to the GitHub issue:
https://github.com/Nicoretti/crc/issues/151
"""
import itertools
import pytest
import crc
def test_original_regression():
reg = crc.Register(crc.Crc8.BLUETOOTH)
reg.init()
reg.update(b"Hello World!")
times = 10
expected = [81 for _ in range(0, times)]
actual = [reg.digest() for _ in range(0, times)]
assert actual == expected
@pytest.mark.parametrize(
"configuration,times,expected",
[
(config, 10, crc.Calculator(config).checksum(b"Hello World!"))
for config in itertools.chain(crc.Crc8, crc.Crc16, crc.Crc32, crc.Crc64)
],
)
def test_digest_is_stable(configuration, times, expected):
expected = [expected for _ in range(times)]
reg = crc.Register(configuration)
reg.init()
reg.update(b"Hello World!")
actual = [reg.digest() for _ in range(times)]
assert actual == expected
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