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TST: utils.paeth_predictor #959

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Jun 7, 2022
Merged

TST: utils.paeth_predictor #959

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19 changes: 19 additions & 0 deletions tests/test_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -95,10 +95,29 @@ def test_b():
assert PyPDF2._utils.b_("😀") == "😀".encode()
assert PyPDF2._utils.b_("‰") == "‰".encode()
assert PyPDF2._utils.b_("▷") == "▷".encode()
assert PyPDF2._utils.b_("世") == "世".encode()


def test_deprecate_no_replacement():
with pytest.raises(PendingDeprecationWarning) as exc:
PyPDF2._utils.deprecate_no_replacement("foo")
error_msg = "foo is deprecated and will be removed in PyPDF2 3.0.0."
assert exc.value.args[0] == error_msg


@pytest.mark.parametrize(
("left", "up", "upleft", "expected"),
[
(0, 0, 0, 0),
(1, 0, 0, 1),
(0, 1, 0, 1),
(0, 0, 1, 0),
(1, 2, 3, 1),
(2, 1, 3, 1),
(1, 3, 2, 2),
(3, 1, 2, 2),
(3, 2, 1, 3),
],
)
def test_paeth_predictor(left, up, upleft, expected):
assert PyPDF2._utils.paeth_predictor(left, up, upleft) == expected