Skip PILImage tests on Qt5 (#1274)

PIL removed support for Qt 5 in
python-pillow/Pillow#8159. This PR skips the
`TestPILImage` tests on Qt 5.

Related: #1255

Author: mdickinson

pyface/tests/test_pil_image.py

@@ -19,8 +19,15 @@
 except ImportError:
     from importlib_resources import as_file, files
 
+from pyface.toolkit import toolkit
 from pyface.util._optional_dependencies import optional_import
 
+if toolkit.toolkit in {"qt", "qt4"}:
+    from pyface.qt import is_qt5
+else:
+    is_qt5 = False
+
+
 Image = None
 
 with optional_import(
@@ -35,6 +42,7 @@
 
 
 @unittest.skipIf(Image is None, "Pillow not available")
+@unittest.skipIf(is_qt5, "PIL.ImageQt does not support Qt 5")
 class TestPILImage(unittest.TestCase):
 
     def test_create_image(self):