added test for reading TIFF from non-disk file obj

Tests/test_file_libtiff.py

@@ -81,6 +81,19 @@ def test_g4_tiff_bytesio(self):
         self.assertEqual(im.size, (500, 500))
         self._assert_noerr(im)
 
+    def test_g4_non_disk_file_object(self):
+        """Testing loading from non-disk non-bytesio file object"""
+        test_file = "Tests/images/hopper_g4_500.tif"
+        s = io.BytesIO()
+        with open(test_file, "rb") as f:
+            s.write(f.read())
+            s.seek(0)
+        r = io.BufferedReader(s)
+        im = Image.open(r)
+
+        self.assertEqual(im.size, (500, 500))
+        self._assert_noerr(im)
+
     def test_g4_eq_png(self):
         """ Checking that we're actually getting the data that we expect"""
         png = Image.open("Tests/images/hopper_bw_500.png")