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93 lines
1.9 KiB
Python
93 lines
1.9 KiB
Python
from __future__ import annotations
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import warnings
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import pytest
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from PIL import DcxImagePlugin, Image
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from .helper import assert_image_equal, hopper, is_pypy
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# Created with ImageMagick: convert hopper.ppm hopper.dcx
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TEST_FILE = "Tests/images/hopper.dcx"
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def test_sanity():
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# Arrange
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# Act
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with Image.open(TEST_FILE) as im:
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# Assert
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assert im.size == (128, 128)
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assert isinstance(im, DcxImagePlugin.DcxImageFile)
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orig = hopper()
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assert_image_equal(im, orig)
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@pytest.mark.skipif(is_pypy(), reason="Requires CPython")
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def test_unclosed_file():
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def open():
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im = Image.open(TEST_FILE)
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im.load()
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with pytest.warns(ResourceWarning):
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open()
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def test_closed_file():
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with warnings.catch_warnings():
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im = Image.open(TEST_FILE)
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im.load()
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im.close()
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def test_context_manager():
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with warnings.catch_warnings():
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with Image.open(TEST_FILE) as im:
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im.load()
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def test_invalid_file():
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with open("Tests/images/flower.jpg", "rb") as fp:
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with pytest.raises(SyntaxError):
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DcxImagePlugin.DcxImageFile(fp)
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def test_tell():
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# Arrange
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with Image.open(TEST_FILE) as im:
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# Act
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frame = im.tell()
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# Assert
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assert frame == 0
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def test_n_frames():
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with Image.open(TEST_FILE) as im:
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assert im.n_frames == 1
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assert not im.is_animated
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def test_eoferror():
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with Image.open(TEST_FILE) as im:
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n_frames = im.n_frames
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# Test seeking past the last frame
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with pytest.raises(EOFError):
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im.seek(n_frames)
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assert im.tell() < n_frames
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# Test that seeking to the last frame does not raise an error
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im.seek(n_frames - 1)
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def test_seek_too_far():
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# Arrange
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with Image.open(TEST_FILE) as im:
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frame = 999 # too big on purpose
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# Act / Assert
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with pytest.raises(EOFError):
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im.seek(frame)
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