def test_optional_import(self):
# Test excusing dependency and the logging behaviour
logger = logging.getLogger(self.id())
with self.assertLogs(logger, level="DEBUG") as log_context:
with optional_import("random_missing_lib", "fail to import",
logger):
# assume this library is not importable.
import random_missing_lib # noqa: F401
log, = log_context.output
self.assertIn("fail to import", log)
import unittest
# importlib.resources is new in Python 3.7, and importlib.resources.files is
# new in Python 3.9, so for Python < 3.9 we must rely on the 3rd party
# importlib_resources package.
try:
from importlib.resources import files
except ImportError:
from importlib_resources import files
from pyface.util._optional_dependencies import optional_import
Image = None
with optional_import("pillow",
msg="PILImage not available due to missing pillow.",
logger=logging.getLogger(__name__)):
from PIL import Image
from ..pil_image import PILImage
IMAGE_PATH = os.fspath(files("pyface.tests") / "images" / "core.png")
@unittest.skipIf(Image is None, "Pillow not available")
class TestPILImage(unittest.TestCase):
def setUp(self):
self.pil_image = Image.open(IMAGE_PATH)
def test_create_image(self):
image = PILImage(self.pil_image)
def test_optional_import_reraise(self):
# Test if the import error was about something else, reraise
logger = logging.getLogger(self.id())
with self.assertRaises(ImportError):
with optional_import("some_random_lib", "", logger):
import some_random_missing_lib # noqa: F401