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54 lines
1.4 KiB
Python
54 lines
1.4 KiB
Python
from io import BytesIO
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from pathlib import Path
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import pytest
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from matplotlib.testing.decorators import image_comparison
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from matplotlib import cm, pyplot as plt
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@image_comparison(['pngsuite.png'], tol=0.04)
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def test_pngsuite():
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files = sorted(
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(Path(__file__).parent / "baseline_images/pngsuite").glob("basn*.png"))
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plt.figure(figsize=(len(files), 2))
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for i, fname in enumerate(files):
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data = plt.imread(fname)
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cmap = None # use default colormap
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if data.ndim == 2:
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# keep grayscale images gray
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cmap = cm.gray
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# Using the old default data interpolation stage lets us
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# continue to use the existing reference image
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plt.imshow(data, extent=(i, i + 1, 0, 1), cmap=cmap,
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interpolation_stage='data')
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plt.gca().patch.set_facecolor("#ddffff")
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plt.gca().set_xlim(0, len(files))
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def test_truncated_file(tmp_path):
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path = tmp_path / 'test.png'
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path_t = tmp_path / 'test_truncated.png'
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plt.savefig(path)
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with open(path, 'rb') as fin:
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buf = fin.read()
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with open(path_t, 'wb') as fout:
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fout.write(buf[:20])
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with pytest.raises(Exception):
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plt.imread(path_t)
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def test_truncated_buffer():
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b = BytesIO()
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plt.savefig(b)
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b.seek(0)
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b2 = BytesIO(b.read(20))
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b2.seek(0)
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with pytest.raises(Exception):
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plt.imread(b2)
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