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Rearranged test code #1

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merged 2 commits into from Jun 19, 2021
Merged

Rearranged test code #1

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f3f4f10
Moved getvalue asserts outside of image context managers
radarhere May 27, 2021
697c0cd
Parametrized test
radarhere May 27, 2021
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78 changes: 22 additions & 56 deletions Tests/test_file_jpeg2k.py
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Expand Up @@ -168,81 +168,47 @@ def test_layers():
assert_image_similar(im, test_card, 0.4)


def test_no_jp2():
out = BytesIO()
out.name = "foo.j2k"
test_card.save(out, "JPEG2000")
out.seek(0)
assert out.read(2) == b"\xff\x4f"

out = BytesIO()
out.name = "foo.jp2"
test_card.save(out, "JPEG2000")
out.seek(4)
assert out.read(2) == b"jP"

out = BytesIO()
test_card.save(out, "JPEG2000", no_jp2=True)
out.seek(0)
assert out.read(2) == b"\xff\x4f"

out = BytesIO()
test_card.save(out, "JPEG2000", no_jp2=True)
out.seek(0)
assert out.read(2) == b"\xff\x4f"

out = BytesIO()
out.name = "foo.j2k"
test_card.save(out, "JPEG2000", no_jp2=True)
out.seek(0)
assert out.read(2) == b"\xff\x4f"

out = BytesIO()
out.name = "foo.jp2"
test_card.save(out, "JPEG2000", no_jp2=True)
out.seek(0)
assert out.read(2) == b"\xff\x4f"

# Use the filename extension to determine format
out = BytesIO()
out.name = "foo.j2k"
test_card.save(out, "JPEG2000", no_jp2=False)
out.seek(0)
assert out.read(2) == b"\xff\x4f"

out = BytesIO()
out.name = "foo.jp2"
test_card.save(out, "JPEG2000", no_jp2=False)
out.seek(4)
assert out.read(2) == b"jP"

# Default to JP2 if no filename
@pytest.mark.parametrize(
"name, args, offset, data",
(
("foo.j2k", {}, 0, b"\xff\x4f"),
("foo.jp2", {}, 4, b"jP"),
(None, {"no_jp2": True}, 0, b"\xff\x4f"),
("foo.j2k", {"no_jp2": True}, 0, b"\xff\x4f"),
("foo.jp2", {"no_jp2": True}, 0, b"\xff\x4f"),
("foo.j2k", {"no_jp2": False}, 0, b"\xff\x4f"),
("foo.jp2", {"no_jp2": False}, 4, b"jP"),
("foo.jp2", {"no_jp2": False}, 4, b"jP"),
),
)
def test_no_jp2(name, args, offset, data):
out = BytesIO()
test_card.save(out, "JPEG2000", no_jp2=False)
out.seek(4)
assert out.read(2) == b"jP"
if name:
out.name = name
test_card.save(out, "JPEG2000", **args)
out.seek(offset)
assert out.read(2) == data


def test_mct():
# Three component
for val in (0, 1):
out = BytesIO()
test_card.save(out, "JPEG2000", mct=val, no_jp2=True)
out.seek(0)

assert out.getvalue()[59] == val
with Image.open(out) as im:
assert_image_similar(im, test_card, 1.0e-3)
assert out.getvalue()[59] == val

# Single component should have MCT disabled
for val in (0, 1):
out = BytesIO()
with Image.open("Tests/images/16bit.cropped.jp2") as jp2:
jp2.save(out, "JPEG2000", mct=val, no_jp2=True)

out.seek(0)
assert out.getvalue()[53] == 0
with Image.open(out) as im:
assert_image_similar(im, jp2, 1.0e-3)
assert out.getvalue()[53] == 0


def test_rgba():
Expand Down