added unix test for fd leak

Tests/test_file_tiff.py

@@ -469,6 +469,22 @@ class TestFileTiff(PillowTestCase):
 
         self.assertEqual(b'Dummy value', reloaded.info['icc_profile'])
 
+    def test_close_on_load(self):
+        # same as test_fd_leak, but runs on unixlike os
+        tmpfile = self.tempfile("temp.tif")
+        import os
+
+        with Image.open("Tests/images/uint16_1_4660.tif") as im:
+            im.save(tmpfile)
+
+        im = Image.open(tmpfile)
+        fp = im.fp
+        self.assertFalse(fp.closed)
+        im.load()
+        self.assertTrue(fp.closed)
+
+        
+
 @unittest.skipUnless(sys.platform.startswith('win32'), "Windows only")
 class TestFileTiffW32(PillowTestCase):
     def test_fd_leak(self):
@@ -479,8 +495,11 @@ class TestFileTiffW32(PillowTestCase):
             im.save(tmpfile)
 
         im = Image.open(tmpfile)
+        fp = im.fp
+        self.assertFalse(fp.closed)
         self.assertRaises(Exception, lambda: os.remove(tmpfile))
         im.load()
+        self.assertTrue(fp.closed)
         # this should not fail, as load should have closed the file. 
         os.remove(tmpfile)