Pillow/Tests/test_file_gribstub.py

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import pytest
from PIL import GribStubImagePlugin, Image
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from .helper import hopper
TEST_FILE = "Tests/images/WAlaska.wind.7days.grb"
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def test_open():
# Act
with Image.open(TEST_FILE) as im:
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# Assert
assert im.format == "GRIB"
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# Dummy data from the stub
assert im.mode == "F"
assert im.size == (1, 1)
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def test_invalid_file():
# Arrange
invalid_file = "Tests/images/flower.jpg"
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# Act / Assert
with pytest.raises(SyntaxError):
GribStubImagePlugin.GribStubImageFile(invalid_file)
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def test_load():
# Arrange
with Image.open(TEST_FILE) as im:
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# Act / Assert: stub cannot load without an implemented handler
with pytest.raises(IOError):
im.load()
def test_save(tmp_path):
# Arrange
im = hopper()
tmpfile = str(tmp_path / "temp.grib")
# Act / Assert: stub cannot save without an implemented handler
with pytest.raises(IOError):
im.save(tmpfile)