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from __future__ import annotations
import warnings
import pytest
from PIL import DcxImagePlugin, Image
from .helper import assert_image_equal, hopper, is_pypy
# Created with ImageMagick: convert hopper.ppm hopper.dcx
TEST_FILE = "Tests/images/hopper.dcx"
def test_sanity() -> None:
# Arrange
# Act
with Image.open(TEST_FILE) as im:
# Assert
assert im.size == (128, 128)
assert isinstance(im, DcxImagePlugin.DcxImageFile)
orig = hopper()
assert_image_equal(im, orig)
@pytest.mark.skipif(is_pypy(), reason="Requires CPython")
def test_unclosed_file() -> None:
def open_test_image() -> None:
im = Image.open(TEST_FILE)
im.load()
with pytest.warns(ResourceWarning):
open_test_image()
def test_closed_file() -> None:
with warnings.catch_warnings():
warnings.simplefilter("error")
im = Image.open(TEST_FILE)
im.load()
im.close()
def test_context_manager() -> None:
with warnings.catch_warnings():
warnings.simplefilter("error")
with Image.open(TEST_FILE) as im:
im.load()
def test_invalid_file() -> None:
with open("Tests/images/flower.jpg", "rb") as fp:
with pytest.raises(SyntaxError):
DcxImagePlugin.DcxImageFile(fp)
def test_tell() -> None:
# Arrange
with Image.open(TEST_FILE) as im:
# Act
frame = im.tell()
# Assert
assert frame == 0
def test_n_frames() -> None:
with Image.open(TEST_FILE) as im:
assert isinstance(im, DcxImagePlugin.DcxImageFile)
assert im.n_frames == 1
assert not im.is_animated
def test_eoferror() -> None:
with Image.open(TEST_FILE) as im:
assert isinstance(im, DcxImagePlugin.DcxImageFile)
n_frames = im.n_frames
# Test seeking past the last frame
with pytest.raises(EOFError):
im.seek(n_frames)
assert im.tell() < n_frames
# Test that seeking to the last frame does not raise an error
im.seek(n_frames - 1)
def test_seek_too_far() -> None:
# Arrange
with Image.open(TEST_FILE) as im:
frame = 999 # too big on purpose
# Act / Assert
with pytest.raises(EOFError):
im.seek(frame)
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