import pytest from PIL import GribStubImagePlugin, Image from .helper import hopper TEST_FILE = "Tests/images/WAlaska.wind.7days.grb" def test_open(): # Act with Image.open(TEST_FILE) as im: # Assert assert im.format == "GRIB" # Dummy data from the stub assert im.mode == "F" assert im.size == (1, 1) def test_invalid_file(): # Arrange invalid_file = "Tests/images/flower.jpg" # Act / Assert with pytest.raises(SyntaxError): GribStubImagePlugin.GribStubImageFile(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(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)