tests: Avoid spurious failures with Pillow 3.4.0 - 3.4.2

tests/__init__.py

@@ -19,6 +19,7 @@
 
 from functools import wraps
 import os
+from PIL import Image
 import unittest
 
 try:
@@ -28,6 +29,15 @@
     have_optimizations = False
 
 
+# PIL.Image cannot have zero width or height on Pillow 3.4.0 - 3.4.2
+# https://github.com/python-pillow/Pillow/issues/2259
+try:
+    Image.new('RGBA', (1, 0))
+    image_dimensions_cannot_be_zero = False
+except ValueError:
+    image_dimensions_cannot_be_zero = True
+
+
 def file_path(name):
     return os.path.join(os.path.dirname(__file__), name)
 

tests/test_imageslide.py

@@ -22,7 +22,7 @@
 from PIL import Image
 import unittest
 
-from . import file_path
+from . import file_path, image_dimensions_cannot_be_zero, skip_if
 
 # Tests should be written to be compatible with Python 2.6 unittest.
 
@@ -104,6 +104,7 @@ def test_read_region(self):
         self.assertEqual(self.osr.read_region((-10, -10), 0, (400, 400)).size,
                 (400, 400))
 
+    @skip_if(image_dimensions_cannot_be_zero, 'Pillow issue #2259')
     def test_read_region_size_dimension_zero(self):
         self.assertEqual(self.osr.read_region((0, 0), 0, (400, 0)).size,
                 (400, 0))

tests/test_openslide.py

@@ -25,7 +25,8 @@
 import sys
 import unittest
 
-from . import file_path, have_optimizations, skip_if
+from . import (file_path, have_optimizations, image_dimensions_cannot_be_zero,
+        skip_if)
 
 # Tests should be written to be compatible with Python 2.6 unittest.
 
@@ -110,6 +111,7 @@ def test_read_region(self):
         self.assertEqual(self.osr.read_region((-10, -10), 1, (400, 400)).size,
                 (400, 400))
 
+    @skip_if(image_dimensions_cannot_be_zero, 'Pillow issue #2259')
     def test_read_region_size_dimension_zero(self):
         self.assertEqual(self.osr.read_region((0, 0), 1, (400, 0)).size,
                 (400, 0))