Image.core.open_ppm has been removed. Test the Storage.c fix with an alternate method. Assert that the ordinary opener rejects the negative size in the PPM file

Tests/test_file_ppm.py

@@ -45,15 +45,13 @@ class TestFilePpm(PillowTestCase):
 
 
     def test_neg_ppm(self):
-        """test_neg_ppm
+        # Storage.c accepted negative values for xsize, ysize.  the
+        # internal open_ppm function didn't check for sanity but it
+        # has been removed. The default opener doesn't accept negative
+        # sizes. 
         
-        Storage.c accepted negative values for xsize, ysize.
-        open_ppm is a core debugging item that doesn't check any parameters for
-        sanity. 
-        """
-        
-        with self.assertRaises(ValueError):
-            Image.core.open_ppm('Tests/images/negative_size.ppm')
+        with self.assertRaises(IOError):
+            Image.open('Tests/images/negative_size.ppm')
 
 
 if __name__ == '__main__':

Tests/test_image.py

@@ -248,6 +248,18 @@ class TestImage(PillowTestCase):
 
         self.assertTrue(Image.new('RGB', (1,1)))
 
+    def test_storage_neg(self):
+        # Storage.c accepted negative values for xsize, ysize.  Was
+        # test_neg_ppm, but the core function for that has been
+        # removed Calling directly into core to test the error in
+        # Storage.c, rather than the size check above
+        
+        with self.assertRaises(ValueError):
+            Image.core.fill('RGB', (2,-2), (0,0,0))
+
+
+
+            
 
 if __name__ == '__main__':
     unittest.main()