Pillow/Tests/test_file_bufrstub.py

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import pytest
from PIL import BufrStubImagePlugin, Image
from .helper import hopper
TEST_FILE = "Tests/images/gfs.t06z.rassda.tm00.bufr_d"
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def test_open():
# Act
with Image.open(TEST_FILE) as im:
# Assert
assert im.format == "BUFR"
# 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):
BufrStubImagePlugin.BufrStubImageFile(invalid_file)
def test_load():
# Arrange
with Image.open(TEST_FILE) as im:
# Act / Assert: stub cannot load without an implemented handler
with pytest.raises(OSError):
im.load()
def test_save(tmp_path):
# Arrange
im = hopper()
tmpfile = str(tmp_path / "temp.bufr")
# Act / Assert: stub cannot save without an implemented handler
with pytest.raises(OSError):
im.save(tmpfile)
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def test_handler(tmp_path):
class TestHandler:
opened = False
loaded = False
saved = False
def open(self, im):
self.opened = True
def load(self, im):
self.loaded = True
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im.fp.close()
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return Image.new("RGB", (1, 1))
def save(self, im, fp, filename):
self.saved = True
handler = TestHandler()
BufrStubImagePlugin.register_handler(handler)
with Image.open(TEST_FILE) as im:
assert handler.opened
assert not handler.loaded
im.load()
assert handler.loaded
temp_file = str(tmp_path / "temp.bufr")
im.save(temp_file)
assert handler.saved
BufrStubImagePlugin._handler = None