Changed file opening in tests to use with

Tests/test_file_png.py

@@ -505,17 +505,17 @@ class TestFilePng(PillowTestCase):
         im.convert("P").save(test_file, dpi=(100, 100))
 
         chunks = []
-        fp = open(test_file, "rb")
-        fp.read(8)
-        png = PngImagePlugin.PngStream(fp)
-        while True:
-            cid, pos, length = png.read()
-            chunks.append(cid)
-            try:
-                s = png.call(cid, pos, length)
-            except EOFError:
-                break
-            png.crc(cid, s)
+        with open(test_file, "rb") as fp:
+            fp.read(8)
+            png = PngImagePlugin.PngStream(fp)
+            while True:
+                cid, pos, length = png.read()
+                chunks.append(cid)
+                try:
+                    s = png.call(cid, pos, length)
+                except EOFError:
+                    break
+                png.crc(cid, s)
 
         # https://www.w3.org/TR/PNG/#5ChunkOrdering
         # IHDR - shall be first

Tests/test_file_tiff.py

@@ -495,12 +495,12 @@ class TestFileTiff(PillowTestCase):
         with Image.open("Tests/images/uint16_1_4660.tif") as im:
             im.save(tmpfile)
 
-        f = open(tmpfile, 'rb')
-        im = Image.open(f)
-        fp = im.fp
-        self.assertFalse(fp.closed)
-        im.load()
-        self.assertFalse(fp.closed)
+        with open(tmpfile, 'rb') as f:
+            im = Image.open(f)
+            fp = im.fp
+            self.assertFalse(fp.closed)
+            im.load()
+            self.assertFalse(fp.closed)
 
 @unittest.skipUnless(sys.platform.startswith('win32'), "Windows only")
 class TestFileTiffW32(PillowTestCase):

Tests/test_font_bdf.py

@@ -9,8 +9,8 @@ class TestFontBdf(PillowTestCase):
 
     def test_sanity(self):
 
-        test_file = open(filename, "rb")
-        font = BdfFontFile.BdfFontFile(test_file)
+        with open(filename, "rb") as test_file:
+            font = BdfFontFile.BdfFontFile(test_file)
 
         self.assertIsInstance(font, FontFile.FontFile)
         self.assertEqual(len([_f for _f in font.glyph if _f]), 190)

Tests/test_font_pcf.py

@@ -17,8 +17,8 @@ class TestFontPcf(PillowTestCase):
             self.skipTest("zlib support not available")
 
     def save_font(self):
-        test_file = open(fontname, "rb")
-        font = PcfFontFile.PcfFontFile(test_file)
+        with open(fontname, "rb") as test_file:
+            font = PcfFontFile.PcfFontFile(test_file)
         self.assertIsInstance(font, FontFile.FontFile)
         self.assertEqual(len([_f for _f in font.glyph if _f]), 192)