Merge pull request #2689 from radarhere/tests

Added tests

PIL/TgaImagePlugin.py

@@ -139,16 +139,13 @@ SAVE = {
 }
 
 
-def _save(im, fp, filename, check=0):
+def _save(im, fp, filename):
 
     try:
         rawmode, bits, colormaptype, imagetype = SAVE[im.mode]
     except KeyError:
         raise IOError("cannot write mode %s as TGA" % im.mode)
 
-    if check:
-        return check
-
     if colormaptype:
         colormapfirst, colormaplength, colormapentry = 0, 256, 24
     else:

PIL/WmfImagePlugin.py

@@ -153,7 +153,7 @@ class WmfStubImageFile(ImageFile.StubImageFile):
 
 
 def _save(im, fp, filename):
-    if _handler is None or not hasattr("_handler", "save"):
+    if _handler is None or not hasattr(_handler, "save"):
         raise IOError("WMF save handler not installed")
     _handler.save(im, fp, filename)
 

Tests/test_decompression_bomb.py

@@ -36,7 +36,7 @@ class TestDecompressionBomb(PillowTestCase):
 
         # Act / Assert
         self.assert_warning(Image.DecompressionBombWarning,
-                            lambda: Image.open(TEST_FILE))
+                            Image.open, TEST_FILE)
 
 class TestDecompressionCrop(PillowTestCase):
 
@@ -52,7 +52,7 @@ class TestDecompressionCrop(PillowTestCase):
         # same decompression bomb warnings on them.
         box = (0, 0, self.src.width * 2, self.src.height * 2)
         self.assert_warning(Image.DecompressionBombWarning,
-                            lambda: self.src.crop(box))    
+                            self.src.crop, box)
 
 if __name__ == '__main__':
     unittest.main()

Tests/test_features.py

@@ -7,7 +7,7 @@ try:
     HAVE_WEBP = True
 except:
     HAVE_WEBP = False
-    
+
 
 class TestFeatures(PillowTestCase):
 
@@ -34,7 +34,7 @@ class TestFeatures(PillowTestCase):
     def check_webp_mux(self):
         self.assertEqual(features.check('webp_mux'),
                          _webp.HAVE_WEBPMUX)
-    
+
     def test_check_modules(self):
         for feature in features.modules:
             self.assertIn(features.check_module(feature), [True, False])
@@ -51,13 +51,13 @@ class TestFeatures(PillowTestCase):
         # Arrange
         codec = "unsupported_codec"
         # Act / Assert
-        self.assertRaises(ValueError, lambda: features.check_codec(codec))
+        self.assertRaises(ValueError, features.check_codec, codec)
 
     def test_unsupported_module(self):
         # Arrange
         module = "unsupported_module"
         # Act / Assert
-        self.assertRaises(ValueError, lambda: features.check_module(module))
+        self.assertRaises(ValueError, features.check_module, module)
 
 
 if __name__ == '__main__':

Tests/test_file_bmp.py

@@ -28,7 +28,7 @@ class TestFileBmp(PillowTestCase):
     def test_invalid_file(self):
         with open("Tests/images/flower.jpg", "rb") as fp:
             self.assertRaises(SyntaxError,
-                              lambda: BmpImagePlugin.BmpImageFile(fp))
+                              BmpImagePlugin.BmpImageFile, fp)
 
     def test_save_to_bytes(self):
         output = io.BytesIO()

Tests/test_file_bufrstub.py

@@ -24,8 +24,7 @@ class TestFileBufrStub(PillowTestCase):
 
         # Act / Assert
         self.assertRaises(SyntaxError,
-                          lambda:
+                          BufrStubImagePlugin.BufrStubImageFile, invalid_file)
-                          BufrStubImagePlugin.BufrStubImageFile(invalid_file))
 
     def test_load(self):
         # Arrange
@@ -40,7 +39,7 @@ class TestFileBufrStub(PillowTestCase):
         tmpfile = self.tempfile("temp.bufr")
 
         # Act / Assert: stub cannot save without an implemented handler
-        self.assertRaises(IOError, lambda: im.save(tmpfile))
+        self.assertRaises(IOError, im.save, tmpfile)
 
 
 if __name__ == '__main__':

Tests/test_file_cur.py

@@ -21,7 +21,7 @@ class TestFileCur(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda: CurImagePlugin.CurImageFile(invalid_file))
+                          CurImagePlugin.CurImageFile, invalid_file)
 
         no_cursors_file = "Tests/images/no_cursors.cur"
 

Tests/test_file_dcx.py

@@ -23,7 +23,7 @@ class TestFileDcx(PillowTestCase):
     def test_invalid_file(self):
         with open("Tests/images/flower.jpg", "rb") as fp:
             self.assertRaises(SyntaxError,
-                              lambda: DcxImagePlugin.DcxImageFile(fp))
+                              DcxImagePlugin.DcxImageFile, fp)
 
     def test_tell(self):
         # Arrange
@@ -58,7 +58,7 @@ class TestFileDcx(PillowTestCase):
         frame = 999  # too big on purpose
 
         # Act / Assert
-        self.assertRaises(EOFError, lambda: im.seek(frame))
+        self.assertRaises(EOFError, im.seek, frame)
 
 
 if __name__ == '__main__':

Tests/test_file_eps.py

@@ -55,7 +55,7 @@ class TestFileEps(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda: EpsImagePlugin.EpsImageFile(invalid_file))
+                          EpsImagePlugin.EpsImageFile, invalid_file)
 
     def test_cmyk(self):
         cmyk_image = Image.open("Tests/images/pil_sample_cmyk.eps")
@@ -97,7 +97,7 @@ class TestFileEps(PillowTestCase):
     def test_image_mode_not_supported(self):
         im = hopper("RGBA")
         tmpfile = self.tempfile('temp.eps')
-        self.assertRaises(ValueError, lambda: im.save(tmpfile))
+        self.assertRaises(ValueError, im.save, tmpfile)
 
     def test_render_scale1(self):
         # We need png support for these render test

Tests/test_file_fitsstub.py

@@ -24,8 +24,7 @@ class TestFileFitsStub(PillowTestCase):
 
         # Act / Assert
         self.assertRaises(SyntaxError,
-                          lambda:
+                          FitsStubImagePlugin.FITSStubImageFile, invalid_file)
-                          FitsStubImagePlugin.FITSStubImageFile(invalid_file))
 
     def test_load(self):
         # Arrange
@@ -41,10 +40,10 @@ class TestFileFitsStub(PillowTestCase):
         dummy_filename = "dummy.filename"
 
         # Act / Assert: stub cannot save without an implemented handler
-        self.assertRaises(IOError, lambda: im.save(dummy_filename))
+        self.assertRaises(IOError, im.save, dummy_filename)
         self.assertRaises(
             IOError,
-            lambda: FitsStubImagePlugin._save(im, dummy_fp, dummy_filename))
+            FitsStubImagePlugin._save, im, dummy_fp, dummy_filename)
 
 
 if __name__ == '__main__':

Tests/test_file_fli.py

@@ -41,7 +41,7 @@ class TestFileFli(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda: FliImagePlugin.FliImageFile(invalid_file))
+                          FliImagePlugin.FliImageFile, invalid_file)
 
     def test_n_frames(self):
         im = Image.open(static_test_file)
@@ -71,7 +71,7 @@ class TestFileFli(PillowTestCase):
         self.assertEqual(im.tell(), 0)
 
         # Test seek past end of file
-        self.assertRaises(EOFError, lambda: im.seek(2))
+        self.assertRaises(EOFError, im.seek, 2)
 
     def test_seek_tell(self):
         im = Image.open(animated_test_file)

Tests/test_file_fpx.py

@@ -9,12 +9,12 @@ class TestFileFpx(PillowTestCase):
         # Test an invalid OLE file
         invalid_file = "Tests/images/flower.jpg"
         self.assertRaises(SyntaxError,
-                          lambda: FpxImagePlugin.FpxImageFile(invalid_file))
+                          FpxImagePlugin.FpxImageFile, invalid_file)
 
         # Test a valid OLE file, but not an FPX file
         ole_file = "Tests/images/test-ole-file.doc"
         self.assertRaises(SyntaxError,
-                          lambda: FpxImagePlugin.FpxImageFile(ole_file))
+                          FpxImagePlugin.FpxImageFile, ole_file)
 
 
 if __name__ == '__main__':

Tests/test_file_gbr.py

@@ -9,7 +9,7 @@ class TestFileGbr(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda: GbrImagePlugin.GbrImageFile(invalid_file))
+                          GbrImagePlugin.GbrImageFile, invalid_file)
 
     def test_gbr_file(self):
         im = Image.open('Tests/images/gbr.gbr')

Tests/test_file_gif.py

@@ -31,7 +31,7 @@ class TestFileGif(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda: GifImagePlugin.GifImageFile(invalid_file))
+                          GifImagePlugin.GifImageFile, invalid_file)
 
     def test_optimize(self):
         def test_grayscale(optimize):
@@ -375,29 +375,31 @@ class TestFileGif(PillowTestCase):
     def test_version(self):
         out = self.tempfile('temp.gif')
 
+        def assertVersionAfterSave(im, version):
+            im.save(out)
+            reread = Image.open(out)
+            self.assertEqual(reread.info["version"], version)
+
         # Test that GIF87a is used by default
         im = Image.new('L', (100, 100), '#000')
-        im.save(out)
+        assertVersionAfterSave(im, b"GIF87a")
-        reread = Image.open(out)
+
-        self.assertEqual(reread.info["version"], b"GIF87a")
+        # Test setting the version to 89a
+        im = Image.new('L', (100, 100), '#000')
+        im.info["version"] = b"89a"
+        assertVersionAfterSave(im, b"GIF89a")
 
         # Test that adding a GIF89a feature changes the version
         im.info["transparency"] = 1
-        im.save(out)
+        assertVersionAfterSave(im, b"GIF89a")
-        reread = Image.open(out)
-        self.assertEqual(reread.info["version"], b"GIF89a")
 
         # Test that a GIF87a image is also saved in that format
         im = Image.open("Tests/images/test.colors.gif")
-        im.save(out)
+        assertVersionAfterSave(im, b"GIF87a")
-        reread = Image.open(out)
-        self.assertEqual(reread.info["version"], b"GIF87a")
 
         # Test that a GIF89a image is also saved in that format
         im.info["version"] = b"GIF89a"
-        im.save(out)
+        assertVersionAfterSave(im, b"GIF87a")
-        reread = Image.open(out)
-        self.assertEqual(reread.info["version"], b"GIF87a")
 
     def test_append_images(self):
         out = self.tempfile('temp.gif')

Tests/test_file_gimppalette.py

@@ -10,13 +10,13 @@ class TestImage(PillowTestCase):
             GimpPaletteFile(fp)
 
         with open('Tests/images/hopper.jpg', 'rb') as fp:
-            self.assertRaises(SyntaxError, lambda: GimpPaletteFile(fp))
+            self.assertRaises(SyntaxError, GimpPaletteFile, fp)
 
         with open('Tests/images/bad_palette_file.gpl', 'rb') as fp:
-            self.assertRaises(SyntaxError, lambda: GimpPaletteFile(fp))
+            self.assertRaises(SyntaxError, GimpPaletteFile, fp)
 
         with open('Tests/images/bad_palette_entry.gpl', 'rb') as fp:
-            self.assertRaises(ValueError, lambda: GimpPaletteFile(fp))
+            self.assertRaises(ValueError, GimpPaletteFile, fp)
 
     def test_get_palette(self):
         # Arrange

Tests/test_file_gribstub.py

@@ -24,8 +24,7 @@ class TestFileGribStub(PillowTestCase):
 
         # Act / Assert
         self.assertRaises(SyntaxError,
-                          lambda:
+                          GribStubImagePlugin.GribStubImageFile, invalid_file)
-                          GribStubImagePlugin.GribStubImageFile(invalid_file))
 
     def test_load(self):
         # Arrange
@@ -40,7 +39,7 @@ class TestFileGribStub(PillowTestCase):
         tmpfile = self.tempfile("temp.grib")
 
         # Act / Assert: stub cannot save without an implemented handler
-        self.assertRaises(IOError, lambda: im.save(tmpfile))
+        self.assertRaises(IOError, im.save, tmpfile)
 
 
 if __name__ == '__main__':

Tests/test_file_hdf5stub.py

@@ -24,8 +24,7 @@ class TestFileHdf5Stub(PillowTestCase):
 
         # Act / Assert
         self.assertRaises(SyntaxError,
-                          lambda:
+                          Hdf5StubImagePlugin.HDF5StubImageFile, invalid_file)
-                          Hdf5StubImagePlugin.HDF5StubImageFile(invalid_file))
 
     def test_load(self):
         # Arrange
@@ -41,10 +40,10 @@ class TestFileHdf5Stub(PillowTestCase):
         dummy_filename = "dummy.filename"
 
         # Act / Assert: stub cannot save without an implemented handler
-        self.assertRaises(IOError, lambda: im.save(dummy_filename))
+        self.assertRaises(IOError, im.save, dummy_filename)
         self.assertRaises(
             IOError,
-            lambda: Hdf5StubImagePlugin._save(im, dummy_fp, dummy_filename))
+            Hdf5StubImagePlugin._save, im, dummy_fp, dummy_filename)
 
 
 if __name__ == '__main__':

Tests/test_file_icns.py

@@ -1,7 +1,8 @@
 from helper import unittest, PillowTestCase
 
-from PIL import Image
+from PIL import Image, IcnsImagePlugin
 
+import io
 import sys
 
 # sample icon file
@@ -82,6 +83,23 @@ class TestFileIcns(PillowTestCase):
             self.assertEqual(im2.mode, 'RGBA')
             self.assertEqual(im2.size, (wr, hr))
 
+    def test_getimage(self):
+        with open(TEST_FILE, 'rb') as fp:
+            icns_file = IcnsImagePlugin.IcnsFile(fp)
+
+            im = icns_file.getimage()
+            self.assertEqual(im.mode, "RGBA")
+            self.assertEqual(im.size, (1024, 1024))
+
+            im = icns_file.getimage((512, 512))
+            self.assertEqual(im.mode, "RGBA")
+            self.assertEqual(im.size, (512, 512))
+
+    def test_not_an_icns_file(self):
+        with io.BytesIO(b'invalid\n') as fp:
+            self.assertRaises(SyntaxError,
+                              IcnsImagePlugin.IcnsFile, fp)
+
 
 if __name__ == '__main__':
     unittest.main()

Tests/test_file_ico.py

@@ -18,7 +18,7 @@ class TestFileIco(PillowTestCase):
     def test_invalid_file(self):
         with open("Tests/images/flower.jpg", "rb") as fp:
             self.assertRaises(SyntaxError,
-                              lambda: IcoImagePlugin.IcoImageFile(fp))
+                              IcoImagePlugin.IcoImageFile, fp)
 
     def test_save_to_bytes(self):
         output = io.BytesIO()

Tests/test_file_im.py

@@ -43,18 +43,27 @@ class TestFileIm(PillowTestCase):
                 self.assertLess(im.tell(), n_frames)
 
     def test_roundtrip(self):
-        out = self.tempfile('temp.im')
+        for mode in ["RGB", "P"]:
-        im = hopper()
+            out = self.tempfile('temp.im')
-        im.save(out)
+            im = hopper(mode)
-        reread = Image.open(out)
+            im.save(out)
+            reread = Image.open(out)
 
-        self.assert_image_equal(reread, im)
+            self.assert_image_equal(reread, im)
+
+    def test_save_unsupported_mode(self):
+        out = self.tempfile('temp.im')
+        im = hopper("HSV")
+        self.assertRaises(ValueError, im.save, out)
 
     def test_invalid_file(self):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda: ImImagePlugin.ImImageFile(invalid_file))
+                          ImImagePlugin.ImImageFile, invalid_file)
+
+    def test_number(self):
+        self.assertEqual(1.2, ImImagePlugin.number("1.2"))
 
 
 if __name__ == '__main__':

Tests/test_file_jpeg.py

@@ -314,7 +314,7 @@ class TestFileJpeg(PillowTestCase):
         self.assertEqual(getsampling(im), (2, 2, 1, 1, 1, 1))
 
         self.assertRaises(
-            TypeError, lambda: self.roundtrip(hopper(), subsampling="1:1:1"))
+            TypeError, self.roundtrip, hopper(), subsampling="1:1:1")
 
     def test_exif(self):
         im = Image.open("Tests/images/pil_sample_rgb.jpg")
@@ -423,18 +423,18 @@ class TestFileJpeg(PillowTestCase):
         self._n_qtables_helper(4, "Tests/images/pil_sample_cmyk.jpg")
 
         # not a sequence
-        self.assertRaises(Exception, lambda: self.roundtrip(im, qtables='a'))
+        self.assertRaises(Exception, self.roundtrip, im, qtables='a')
         # sequence wrong length
-        self.assertRaises(Exception, lambda: self.roundtrip(im, qtables=[]))
+        self.assertRaises(Exception, self.roundtrip, im, qtables=[])
         # sequence wrong length
         self.assertRaises(Exception,
-                          lambda: self.roundtrip(im, qtables=[1, 2, 3, 4, 5]))
+                          self.roundtrip, im, qtables=[1, 2, 3, 4, 5])
 
         # qtable entry not a sequence
-        self.assertRaises(Exception, lambda: self.roundtrip(im, qtables=[1]))
+        self.assertRaises(Exception, self.roundtrip, im, qtables=[1])
         # qtable entry has wrong number of items
         self.assertRaises(Exception,
-                          lambda: self.roundtrip(im, qtables=[[1, 2, 3, 4]]))
+                          self.roundtrip, im, qtables=[[1, 2, 3, 4]])
 
     @unittest.skipUnless(djpeg_available(), "djpeg not available")
     def test_load_djpeg(self):
@@ -479,7 +479,7 @@ class TestFileJpeg(PillowTestCase):
         # Act
         # Shouldn't raise error
         fn = "Tests/images/sugarshack_bad_mpo_header.jpg"
-        im = self.assert_warning(UserWarning, lambda: Image.open(fn))
+        im = self.assert_warning(UserWarning, Image.open, fn)
 
         # Assert
         self.assertEqual(im.format, "JPEG")
@@ -584,7 +584,7 @@ class TestFileCloseW32(PillowTestCase):
         im = Image.open(tmpfile)
         fp = im.fp
         self.assertFalse(fp.closed)
-        self.assertRaises(Exception, lambda: os.remove(tmpfile))
+        self.assertRaises(Exception, os.remove, tmpfile)
         im.load()
         self.assertTrue(fp.closed)
         # this should not fail, as load should have closed the file.

Tests/test_file_jpeg2k.py

@@ -44,8 +44,7 @@ class TestFileJpeg2k(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda:
+                          Jpeg2KImagePlugin.Jpeg2KImageFile, invalid_file)
-                          Jpeg2KImagePlugin.Jpeg2KImageFile(invalid_file))
 
     def test_bytesio(self):
         with open('Tests/images/test-card-lossless.jp2', 'rb') as f:

Tests/test_file_libtiff.py

@@ -362,10 +362,9 @@ class TestFileLibTiff(LibTiffTestCase):
         im = hopper('RGB')
         out = self.tempfile('temp.tif')
 
-        self.assertRaises(
+        self.assertRaises(IOError, im.save, out, compression='tiff_ccitt')
-            IOError, lambda: im.save(out, compression='tiff_ccitt'))
+        self.assertRaises(IOError, im.save, out, compression='group3')
-        self.assertRaises(IOError, lambda: im.save(out, compression='group3'))
+        self.assertRaises(IOError, im.save, out, compression='group4')
-        self.assertRaises(IOError, lambda: im.save(out, compression='group4'))
 
     def test_fp_leak(self):
         im = Image.open("Tests/images/hopper_g4_500.tif")
@@ -373,10 +372,10 @@ class TestFileLibTiff(LibTiffTestCase):
 
         os.fstat(fn)
         im.load()  # this should close it.
-        self.assertRaises(OSError, lambda: os.fstat(fn))
+        self.assertRaises(OSError, os.fstat, fn)
         im = None  # this should force even more closed.
-        self.assertRaises(OSError, lambda: os.fstat(fn))
+        self.assertRaises(OSError, os.fstat, fn)
-        self.assertRaises(OSError, lambda: os.close(fn))
+        self.assertRaises(OSError, os.close, fn)
 
     def test_multipage(self):
         # issue #862

Tests/test_file_mcidas.py

@@ -9,8 +9,7 @@ class TestFileMcIdas(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda:
+                          McIdasImagePlugin.McIdasImageFile, invalid_file)
-                          McIdasImagePlugin.McIdasImageFile(invalid_file))
 
     def test_valid_file(self):
         # Arrange

Tests/test_file_mic.py

@@ -42,19 +42,19 @@ class TestFileMic(PillowTestCase):
         im.seek(0)
         self.assertEqual(im.tell(), 0)
 
-        self.assertRaises(EOFError, lambda: im.seek(99))
+        self.assertRaises(EOFError, im.seek, 99)
         self.assertEqual(im.tell(), 0)
 
     def test_invalid_file(self):
         # Test an invalid OLE file
         invalid_file = "Tests/images/flower.jpg"
         self.assertRaises(SyntaxError,
-                          lambda: MicImagePlugin.MicImageFile(invalid_file))
+                          MicImagePlugin.MicImageFile, invalid_file)
 
         # Test a valid OLE file, but not a MIC file
         ole_file = "Tests/images/test-ole-file.doc"
         self.assertRaises(SyntaxError,
-                          lambda: MicImagePlugin.MicImageFile(ole_file))
+                          MicImagePlugin.MicImageFile, ole_file)
 
 
 if __name__ == '__main__':

Tests/test_file_msp.py

@@ -26,7 +26,7 @@ class TestFileMsp(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda: MspImagePlugin.MspImageFile(invalid_file))
+                          MspImagePlugin.MspImageFile, invalid_file)
 
     def test_bad_checksum(self):
         # Arrange
@@ -35,7 +35,7 @@ class TestFileMsp(PillowTestCase):
 
         # Act / Assert
         self.assertRaises(SyntaxError,
-                          lambda: MspImagePlugin.MspImageFile(bad_checksum))
+                          MspImagePlugin.MspImageFile, bad_checksum)
 
     def test_open_windows_v1(self):
         # Arrange
@@ -77,7 +77,7 @@ class TestFileMsp(PillowTestCase):
         filename = self.tempfile("temp.msp")
 
         # Act/Assert
-        self.assertRaises(IOError, lambda: im.save(filename))
+        self.assertRaises(IOError, im.save, filename)
 
 
 if __name__ == '__main__':

Tests/test_file_palm.py

@@ -51,7 +51,7 @@ class TestFilePalm(PillowTestCase):
         mode = "RGB"
 
         # Act / Assert
-        self.assertRaises(IOError, lambda: self.helper_save_as_palm(mode))
+        self.assertRaises(IOError, self.helper_save_as_palm, mode)
 
 
 if __name__ == '__main__':

Tests/test_file_pcx.py

@@ -21,13 +21,14 @@ class TestFilePcx(PillowTestCase):
 
         # Test an unsupported mode
         f = self.tempfile("temp.pcx")
-        self.assertRaises(ValueError, lambda: hopper("RGBA").save(f))
+        im = hopper("RGBA")
+        self.assertRaises(ValueError, im.save, f)
 
     def test_invalid_file(self):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda: PcxImagePlugin.PcxImageFile(invalid_file))
+                          PcxImagePlugin.PcxImageFile, invalid_file)
 
     def test_odd(self):
         # see issue #523, odd sized images should have a stride that's even.

Tests/test_file_pdf.py

@@ -59,7 +59,7 @@ class TestFilePdf(PillowTestCase):
         im = hopper("LA")
         outfile = self.tempfile("temp_LA.pdf")
 
-        self.assertRaises(ValueError, lambda: im.save(outfile))
+        self.assertRaises(ValueError, im.save, outfile)
 
     def test_save_all(self):
         # Single frame image

Tests/test_file_pixar.py

@@ -22,7 +22,7 @@ class TestFilePixar(PillowTestCase):
 
         self.assertRaises(
             SyntaxError,
-            lambda: PixarImagePlugin.PixarImageFile(invalid_file))
+            PixarImagePlugin.PixarImageFile, invalid_file)
 
 
 if __name__ == '__main__':

Tests/test_file_png.py

@@ -87,14 +87,14 @@ class TestFilePng(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda: PngImagePlugin.PngImageFile(invalid_file))
+                          PngImagePlugin.PngImageFile, invalid_file)
 
     def test_broken(self):
         # Check reading of totally broken files.  In this case, the test
         # file was checked into Subversion as a text file.
 
         test_file = "Tests/images/broken.png"
-        self.assertRaises(IOError, lambda: Image.open(test_file))
+        self.assertRaises(IOError, Image.open, test_file)
 
     def test_bad_text(self):
         # Make sure PIL can read malformed tEXt chunks (@PIL152)
@@ -424,7 +424,7 @@ class TestFilePng(PillowTestCase):
             data = b'\x89' + fd.read()
 
         pngfile = BytesIO(data)
-        self.assertRaises(IOError, lambda: Image.open(pngfile))
+        self.assertRaises(IOError, Image.open, pngfile)
 
     def test_trns_rgb(self):
         # Check writing and reading of tRNS chunks for RGB images.
@@ -505,17 +505,17 @@ class TestFilePng(PillowTestCase):
         im.convert("P").save(test_file, dpi=(100, 100))
 
         chunks = []
-        fp = open(test_file, "rb")
+        with open(test_file, "rb") as fp:
-        fp.read(8)
+            fp.read(8)
-        png = PngImagePlugin.PngStream(fp)
+            png = PngImagePlugin.PngStream(fp)
-        while True:
+            while True:
-            cid, pos, length = png.read()
+                cid, pos, length = png.read()
-            chunks.append(cid)
+                chunks.append(cid)
-            try:
+                try:
-                s = png.call(cid, pos, length)
+                    s = png.call(cid, pos, length)
-            except EOFError:
+                except EOFError:
-                break
+                    break
-            png.crc(cid, s)
+                png.crc(cid, s)
 
         # https://www.w3.org/TR/PNG/#5ChunkOrdering
         # IHDR - shall be first
@@ -531,6 +531,12 @@ class TestFilePng(PillowTestCase):
         # pHYs - before IDAT
         self.assertLess(chunks.index(b"pHYs"), chunks.index(b"IDAT"))
 
+    def test_getchunks(self):
+        im = hopper()
+
+        chunks = PngImagePlugin.getchunks(im)
+        self.assertEqual(len(chunks), 3)
+
 
 @unittest.skipIf(sys.platform.startswith('win32'), "requires Unix or MacOS")
 class TestTruncatedPngPLeaks(PillowTestCase):

Tests/test_file_ppm.py

@@ -39,7 +39,7 @@ class TestFilePpm(PillowTestCase):
         with open(path, 'w') as f:
             f.write('P6')
 
-        self.assertRaises(ValueError, lambda: Image.open(path))
+        self.assertRaises(ValueError, Image.open, path)
 
     def test_neg_ppm(self):
         # Storage.c accepted negative values for xsize, ysize.  the

Tests/test_file_psd.py

@@ -21,7 +21,7 @@ class TestImagePsd(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda: PsdImagePlugin.PsdImageFile(invalid_file))
+                          PsdImagePlugin.PsdImageFile, invalid_file)
 
     def test_n_frames(self):
         im = Image.open("Tests/images/hopper_merged.psd")
@@ -66,7 +66,7 @@ class TestImagePsd(PillowTestCase):
     def test_seek_eoferror(self):
         im = Image.open(test_file)
 
-        self.assertRaises(EOFError, lambda: im.seek(-1))
+        self.assertRaises(EOFError, im.seek, -1)
 
     def test_icc_profile(self):
         im = Image.open(test_file)

Tests/test_file_sgi.py

@@ -42,8 +42,7 @@ class TestFileSgi(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(ValueError,
-                          lambda:
+                          SgiImagePlugin.SgiImageFile, invalid_file)
-                          SgiImagePlugin.SgiImageFile(invalid_file))
 
     def test_write(self):
         def roundtrip(img):
@@ -62,14 +61,14 @@ class TestFileSgi(PillowTestCase):
         im = hopper('LA')
         out = self.tempfile('temp.sgi')
 
-        self.assertRaises(ValueError, lambda: im.save(out, format='sgi'))
+        self.assertRaises(ValueError, im.save, out, format='sgi')
 
     def test_incorrect_number_of_bands(self):
         im = hopper('YCbCr')
         im.mode = 'RGB'
         out = self.tempfile('temp.sgi')
 
-        self.assertRaises(ValueError, lambda: im.save(out, format='sgi'))
+        self.assertRaises(ValueError, im.save, out, format='sgi')
 
 
 if __name__ == '__main__':

Tests/test_file_spider.py

@@ -84,12 +84,12 @@ class TestImageSpider(PillowTestCase):
     def test_invalid_file(self):
         invalid_file = "Tests/images/invalid.spider"
 
-        self.assertRaises(IOError, lambda: Image.open(invalid_file))
+        self.assertRaises(IOError, Image.open, invalid_file)
 
     def test_nonstack_file(self):
         im = Image.open(TEST_FILE)
 
-        self.assertRaises(EOFError, lambda: im.seek(0))
+        self.assertRaises(EOFError, im.seek, 0)
 
     def test_nonstack_dos(self):
         im = Image.open(TEST_FILE)

Tests/test_file_sun.py

@@ -24,7 +24,7 @@ class TestFileSun(PillowTestCase):
 
         invalid_file = "Tests/images/flower.jpg"
         self.assertRaises(SyntaxError,
-                          lambda: SunImagePlugin.SunImageFile(invalid_file))
+                          SunImagePlugin.SunImageFile, invalid_file)
 
     def test_im1(self):
         im = Image.open('Tests/images/sunraster.im1')

Tests/test_file_tiff.py

@@ -85,6 +85,10 @@ class TestFileTiff(PillowTestCase):
         im = Image.open("Tests/images/copyleft.tiff")
         self.assertEqual(im.mode, 'RGB')
 
+    def test_set_legacy_api(self):
+        with self.assertRaises(Exception):
+            ImageFileDirectory_v2.legacy_api = None
+
     def test_xyres_tiff(self):
         filename = "Tests/images/pil168.tif"
         im = Image.open(filename)
@@ -140,11 +144,11 @@ class TestFileTiff(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda: TiffImagePlugin.TiffImageFile(invalid_file))
+                          TiffImagePlugin.TiffImageFile, invalid_file)
 
         TiffImagePlugin.PREFIXES.append(b"\xff\xd8\xff\xe0")
         self.assertRaises(SyntaxError,
-                          lambda: TiffImagePlugin.TiffImageFile(invalid_file))
+                          TiffImagePlugin.TiffImageFile, invalid_file)
         TiffImagePlugin.PREFIXES.pop()
 
     def test_bad_exif(self):
@@ -163,7 +167,7 @@ class TestFileTiff(PillowTestCase):
     def test_save_unsupported_mode(self):
         im = hopper("HSV")
         outfile = self.tempfile("temp.tif")
-        self.assertRaises(IOError, lambda: im.save(outfile))
+        self.assertRaises(IOError, im.save, outfile)
 
     def test_little_endian(self):
         im = Image.open('Tests/images/16bit.cropped.tif')
@@ -340,7 +344,7 @@ class TestFileTiff(PillowTestCase):
         filename = "Tests/images/pil136.tiff"
         im = Image.open(filename)
         self.assertEqual(im.tell(), 0)
-        self.assertRaises(EOFError, lambda: im.seek(1))
+        self.assertRaises(EOFError, im.seek, 1)
 
     def test__limit_rational_int(self):
         from PIL.TiffImagePlugin import _limit_rational
@@ -495,12 +499,12 @@ class TestFileTiff(PillowTestCase):
         with Image.open("Tests/images/uint16_1_4660.tif") as im:
             im.save(tmpfile)
 
-        f = open(tmpfile, 'rb')
+        with open(tmpfile, 'rb') as f:
-        im = Image.open(f)
+            im = Image.open(f)
-        fp = im.fp
+            fp = im.fp
-        self.assertFalse(fp.closed)
+            self.assertFalse(fp.closed)
-        im.load()
+            im.load()
-        self.assertFalse(fp.closed)
+            self.assertFalse(fp.closed)
 
 @unittest.skipUnless(sys.platform.startswith('win32'), "Windows only")
 class TestFileTiffW32(PillowTestCase):
@@ -515,7 +519,7 @@ class TestFileTiffW32(PillowTestCase):
         im = Image.open(tmpfile)
         fp = im.fp
         self.assertFalse(fp.closed)
-        self.assertRaises(Exception, lambda: os.remove(tmpfile))
+        self.assertRaises(Exception, os.remove, tmpfile)
         im.load()
         self.assertTrue(fp.closed)
 

Tests/test_file_tiff_metadata.py

@@ -161,7 +161,7 @@ class TestFileTiffMetadata(PillowTestCase):
         head = f.read(8)
         info = TiffImagePlugin.ImageFileDirectory(head)
         try:
-            self.assert_warning(UserWarning, lambda: info.load(f))
+            self.assert_warning(UserWarning, info.load, f)
         except struct.error:
             self.fail("Should not be struct errors there.")
 

Tests/test_file_webp.py

@@ -75,7 +75,8 @@ class TestFileWebp(PillowTestCase):
     def test_write_unsupported_mode(self):
         temp_file = self.tempfile("temp.webp")
 
-        self.assertRaises(IOError, lambda: hopper("L").save(temp_file))
+        im = hopper("L")
+        self.assertRaises(IOError, im.save, temp_file)
 
     def test_WebPEncode_with_invalid_args(self):
         self.assertRaises(TypeError, _webp.WebPEncode)

Tests/test_file_wmf.py

@@ -1,5 +1,7 @@
 from helper import unittest, PillowTestCase, hopper
+
 from PIL import Image
+from PIL import WmfImagePlugin
 
 
 class TestFileWmf(PillowTestCase):
@@ -26,12 +28,29 @@ class TestFileWmf(PillowTestCase):
             imref.load()
             self.assert_image_similar(im, imref, 2.0)
 
+    def test_register_handler(self):
+        class TestHandler:
+            methodCalled = False
+
+            def save(self, im, fp, filename):
+                self.methodCalled = True
+        handler = TestHandler()
+        WmfImagePlugin.register_handler(handler)
+
+        im = hopper()
+        tmpfile = self.tempfile("temp.wmf")
+        im.save(tmpfile)
+        self.assertTrue(handler.methodCalled)
+
+        # Restore the state before this test
+        WmfImagePlugin.register_handler(None)
+
     def test_save(self):
         im = hopper()
 
         for ext in [".wmf", ".emf"]:
             tmpfile = self.tempfile("temp"+ext)
-            self.assertRaises(IOError, lambda: im.save(tmpfile))
+            self.assertRaises(IOError, im.save, tmpfile)
 
 
 if __name__ == '__main__':

Tests/test_file_xpm.py

@@ -21,7 +21,7 @@ class TestFileXpm(PillowTestCase):
         invalid_file = "Tests/images/flower.jpg"
 
         self.assertRaises(SyntaxError,
-                          lambda: XpmImagePlugin.XpmImageFile(invalid_file))
+                          XpmImagePlugin.XpmImageFile, invalid_file)
 
     def test_load_read(self):
         # Arrange

Tests/test_file_xvthumb.py

@@ -25,8 +25,7 @@ class TestFileXVThumb(PillowTestCase):
 
         # Act / Assert
         self.assertRaises(SyntaxError,
-                          lambda:
+                          XVThumbImagePlugin.XVThumbImageFile, bad_file)
-                          XVThumbImagePlugin.XVThumbImageFile(bad_file))
 
     def test_invalid_file(self):
         # Arrange
@@ -34,8 +33,7 @@ class TestFileXVThumb(PillowTestCase):
 
         # Act / Assert
         self.assertRaises(SyntaxError,
-                          lambda:
+                          XVThumbImagePlugin.XVThumbImageFile, invalid_file)
-                          XVThumbImagePlugin.XVThumbImageFile(invalid_file))
 
 
 if __name__ == '__main__':

Tests/test_font_bdf.py

@@ -9,15 +9,15 @@ class TestFontBdf(PillowTestCase):
 
     def test_sanity(self):
 
-        test_file = open(filename, "rb")
+        with open(filename, "rb") as test_file:
-        font = BdfFontFile.BdfFontFile(test_file)
+            font = BdfFontFile.BdfFontFile(test_file)
 
         self.assertIsInstance(font, FontFile.FontFile)
         self.assertEqual(len([_f for _f in font.glyph if _f]), 190)
 
     def test_invalid_file(self):
         with open("Tests/images/flower.jpg", "rb") as fp:
-            self.assertRaises(SyntaxError, lambda: BdfFontFile.BdfFontFile(fp))
+            self.assertRaises(SyntaxError, BdfFontFile.BdfFontFile, fp)
 
 
 if __name__ == '__main__':

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")
+        with open(fontname, "rb") as test_file:
-        font = PcfFontFile.PcfFontFile(test_file)
+            font = PcfFontFile.PcfFontFile(test_file)
         self.assertIsInstance(font, FontFile.FontFile)
         self.assertEqual(len([_f for _f in font.glyph if _f]), 192)
 
@@ -32,7 +32,7 @@ class TestFontPcf(PillowTestCase):
 
     def test_invalid_file(self):
         with open("Tests/images/flower.jpg", "rb") as fp:
-            self.assertRaises(SyntaxError, lambda: PcfFontFile.PcfFontFile(fp))
+            self.assertRaises(SyntaxError, PcfFontFile.PcfFontFile, fp)
 
     def xtest_draw(self):
 

Tests/test_image.py

@@ -47,10 +47,9 @@ class TestImage(PillowTestCase):
         self.assertEqual(im2.getcolors(), [(10000, 0)])
         self.assertEqual(im3.getcolors(), [(10000, 0)])
 
-        self.assertRaises(ValueError, lambda: Image.new("X", (100, 100)))
+        self.assertRaises(ValueError, Image.new, "X", (100, 100))
-        self.assertRaises(ValueError, lambda: Image.new("", (100, 100)))
+        self.assertRaises(ValueError, Image.new, "", (100, 100))
-        # self.assertRaises(
+        # self.assertRaises(MemoryError, Image.new, "L", (1000000, 1000000))
-        #     MemoryError, lambda: Image.new("L", (1000000, 1000000)))
 
     def test_width_height(self):
         im = Image.new("RGB", (1, 2))
@@ -68,7 +67,10 @@ class TestImage(PillowTestCase):
         else:
             import io
             im = io.BytesIO(b'')
-        self.assertRaises(IOError, lambda: Image.open(im))
+        self.assertRaises(IOError, Image.open, im)
+
+    def test_bad_mode(self):
+        self.assertRaises(ValueError, Image.open, "filename", "bad mode")
 
     @unittest.skipIf(sys.version_info < (3, 4),
                      "pathlib only available in Python 3.4 or later")
@@ -109,7 +111,7 @@ class TestImage(PillowTestCase):
     def test_unknown_extension(self):
         im = hopper()
         temp_file = self.tempfile("temp.unknown")
-        self.assertRaises(ValueError, lambda: im.save(temp_file))
+        self.assertRaises(ValueError, im.save, temp_file)
 
     def test_internals(self):
 
@@ -273,6 +275,20 @@ class TestImage(PillowTestCase):
                                 target.crop((32, 32, 96, 96)))
         self.assertEqual(source.size, (128, 128))
 
+        # errors
+        self.assertRaises(ValueError,
+            source.alpha_composite, over, "invalid source")
+        self.assertRaises(ValueError,
+            source.alpha_composite, over, (0, 0), "invalid destination")
+        self.assertRaises(ValueError,
+            source.alpha_composite, over, (0))
+        self.assertRaises(ValueError,
+            source.alpha_composite, over, (0, 0), (0))
+        self.assertRaises(ValueError,
+            source.alpha_composite, over, (0, -1))
+        self.assertRaises(ValueError,
+            source.alpha_composite, over, (0, 0), (0, -1))
+
     def test_registered_extensions_uninitialized(self):
         # Arrange
         Image._initialized = 0
@@ -327,7 +343,7 @@ class TestImage(PillowTestCase):
         # Act/Assert
         self.assertRaises(
             ValueError,
-            lambda: Image.effect_mandelbrot(size, extent, quality))
+            Image.effect_mandelbrot, size, extent, quality)
 
     def test_effect_noise(self):
         # Arrange
@@ -388,7 +404,7 @@ class TestImage(PillowTestCase):
         im = hopper()
 
         # Act / Assert
-        self.assertRaises(NotImplementedError, lambda: im.offset(None))
+        self.assertRaises(NotImplementedError, im.offset, None)
 
     def test_fromstring(self):
         self.assertRaises(NotImplementedError, Image.fromstring)
@@ -399,8 +415,7 @@ class TestImage(PillowTestCase):
 
         # Act / Assert
         self.assertRaises(ValueError,
-                          lambda: Image.linear_gradient(wrong_mode))
+                          Image.linear_gradient, wrong_mode)
-        return
 
     def test_linear_gradient(self):
 
@@ -425,8 +440,7 @@ class TestImage(PillowTestCase):
 
         # Act / Assert
         self.assertRaises(ValueError,
-                          lambda: Image.radial_gradient(wrong_mode))
+                          Image.radial_gradient, wrong_mode)
-        return
 
     def test_radial_gradient(self):
 
@@ -445,6 +459,11 @@ class TestImage(PillowTestCase):
             target = Image.open(target_file).convert(mode)
             self.assert_image_equal(im, target)
 
+    def test_remap_palette(self):
+        # Test illegal image mode
+        im = hopper()
+        self.assertRaises(ValueError, im.remap_palette, None)
+
 
     def test__new(self):
         from PIL import ImagePalette
@@ -496,10 +515,10 @@ class TestRegistry(PillowTestCase):
         self.assertEqual(enc.args, ('RGB', 'args', 'extra'))
 
     def test_encode_registry_fail(self):
-        self.assertRaises(IOError, lambda: Image._getencoder('RGB',
+        self.assertRaises(IOError, Image._getencoder, 'RGB',
-                                                             'DoesNotExist',
+                                                      'DoesNotExist',
-                                                             ('args',),
+                                                      ('args',),
-                                                             extra=('extra',)))
+                                                      extra=('extra',))
 
 if __name__ == '__main__':
     unittest.main()

Tests/test_image_convert.py

@@ -107,7 +107,7 @@ class TestImageConvert(PillowTestCase):
 
         p = self.assert_warning(
             UserWarning,
-            lambda: im.convert('P', palette=Image.ADAPTIVE))
+            im.convert, 'P', palette=Image.ADAPTIVE)
         self.assertNotIn('transparency', p.info)
         p.save(f)
 
@@ -131,7 +131,7 @@ class TestImageConvert(PillowTestCase):
 
         p = self.assert_warning(
             UserWarning,
-            lambda: im.convert('P', palette=Image.ADAPTIVE))
+            im.convert, 'P', palette=Image.ADAPTIVE)
         self.assertNotIn('transparency', p.info)
         p.save(f)
 
@@ -155,7 +155,7 @@ class TestImageConvert(PillowTestCase):
 
         # Act / Assert
         self.assertRaises(ValueError,
-                          lambda: im.convert(mode='CMYK', matrix=matrix))
+                          im.convert, mode='CMYK', matrix=matrix)
 
     def test_matrix_wrong_mode(self):
         # Arrange
@@ -168,7 +168,7 @@ class TestImageConvert(PillowTestCase):
 
         # Act / Assert
         self.assertRaises(ValueError,
-                          lambda: im.convert(mode='L', matrix=matrix))
+                          im.convert, mode='L', matrix=matrix)
 
     def test_matrix_xyz(self):
 

Tests/test_image_filter.py

@@ -34,7 +34,7 @@ class TestImageFilter(PillowTestCase):
         filter(ImageFilter.UnsharpMask)
         filter(ImageFilter.UnsharpMask(10))
 
-        self.assertRaises(TypeError, lambda: filter("hello"))
+        self.assertRaises(TypeError, filter, "hello")
 
     def test_crash(self):
 
@@ -83,7 +83,7 @@ class TestImageFilter(PillowTestCase):
 
         self.assertEqual(rankfilter("1"), (0, 4, 8))
         self.assertEqual(rankfilter("L"), (0, 4, 8))
-        self.assertRaises(ValueError, lambda: rankfilter("P"))
+        self.assertRaises(ValueError, rankfilter, "P")
         self.assertEqual(rankfilter("RGB"), ((0, 0, 0), (4, 0, 0), (8, 0, 0)))
         self.assertEqual(rankfilter("I"), (0, 4, 8))
         self.assertEqual(rankfilter("F"), (0.0, 4.0, 8.0))

Tests/test_image_frombytes.py

@@ -11,6 +11,9 @@ class TestImageFromBytes(PillowTestCase):
 
         self.assert_image_equal(im1, im2)
 
+    def test_not_implemented(self):
+        self.assertRaises(NotImplementedError, Image.fromstring)
+
 
 if __name__ == '__main__':
     unittest.main()

Tests/test_image_load.py

@@ -19,7 +19,7 @@ class TestImageLoad(PillowTestCase):
         im = Image.open("Tests/images/hopper.gif")
         im.close()
         self.assertRaises(ValueError, im.load)
-        self.assertRaises(ValueError, lambda: im.getpixel((0, 0)))
+        self.assertRaises(ValueError, im.getpixel, (0, 0))
 
     def test_contextmanager(self):
         fn = None
@@ -27,7 +27,7 @@ class TestImageLoad(PillowTestCase):
             fn = im.fp.fileno()
             os.fstat(fn)
 
-        self.assertRaises(OSError, lambda: os.fstat(fn))
+        self.assertRaises(OSError, os.fstat, fn)
 
 if __name__ == '__main__':
     unittest.main()

Tests/test_image_point.py

@@ -6,17 +6,17 @@ class TestImagePoint(PillowTestCase):
     def test_sanity(self):
         im = hopper()
 
-        self.assertRaises(ValueError, lambda: im.point(list(range(256))))
+        self.assertRaises(ValueError, im.point, list(range(256)))
         im.point(list(range(256))*3)
         im.point(lambda x: x)
 
         im = im.convert("I")
-        self.assertRaises(ValueError, lambda: im.point(list(range(256))))
+        self.assertRaises(ValueError, im.point, list(range(256)))
         im.point(lambda x: x*1)
         im.point(lambda x: x+1)
         im.point(lambda x: x*1+1)
-        self.assertRaises(TypeError, lambda: im.point(lambda x: x-1))
+        self.assertRaises(TypeError, im.point, lambda x: x-1)
-        self.assertRaises(TypeError, lambda: im.point(lambda x: x/1))
+        self.assertRaises(TypeError, im.point, lambda x: x/1)
 
     def test_16bit_lut(self):
         """ Tests for 16 bit -> 8 bit lut for converting I->L images
@@ -36,7 +36,8 @@ class TestImagePoint(PillowTestCase):
         self.assert_image_equal(out.convert('L'), im.point(int_lut, 'L'))
 
     def test_f_mode(self):
-        self.assertRaises(ValueError, lambda: hopper('F').point(None))
+        im = hopper('F')
+        self.assertRaises(ValueError, im.point, None)
 
 
 if __name__ == '__main__':

Tests/test_image_putpalette.py

@@ -13,14 +13,14 @@ class TestImagePutPalette(PillowTestCase):
             if p:
                 return im.mode, p[:10]
             return im.mode
-        self.assertRaises(ValueError, lambda: palette("1"))
+        self.assertRaises(ValueError, palette, "1")
         self.assertEqual(palette("L"), ("P", [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]))
         self.assertEqual(palette("P"), ("P", [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]))
-        self.assertRaises(ValueError, lambda: palette("I"))
+        self.assertRaises(ValueError, palette, "I")
-        self.assertRaises(ValueError, lambda: palette("F"))
+        self.assertRaises(ValueError, palette, "F")
-        self.assertRaises(ValueError, lambda: palette("RGB"))
+        self.assertRaises(ValueError, palette, "RGB")
-        self.assertRaises(ValueError, lambda: palette("RGBA"))
+        self.assertRaises(ValueError, palette, "RGBA")
-        self.assertRaises(ValueError, lambda: palette("YCbCr"))
+        self.assertRaises(ValueError, palette, "YCbCr")
 
     def test_imagepalette(self):
         im = hopper("P")

Tests/test_image_quantize.py

@@ -39,7 +39,7 @@ class TestImageQuantize(PillowTestCase):
     def test_rgba_quantize(self):
         image = hopper('RGBA')
         image.quantize()
-        self.assertRaises(Exception, lambda: image.quantize(method=0))
+        self.assertRaises(Exception, image.quantize, method=0)
 
     def test_quantize(self):
         image = Image.open('Tests/images/caption_6_33_22.png').convert('RGB')

Tests/test_image_resize.py

@@ -112,6 +112,10 @@ class TestImageResize(PillowTestCase):
             resize(mode, (112, 103))
             resize(mode, (188, 214))
 
+        # Test unknown resampling filter
+        im = hopper()
+        self.assertRaises(ValueError, im.resize, (10, 10), "unknown")
+
 
 if __name__ == '__main__':
     unittest.main()

Tests/test_image_transform.py

@@ -141,8 +141,8 @@ class TestImageTransform(PillowTestCase):
         self.test_mesh()
 
     def test_missing_method_data(self):
-        self.assertRaises(ValueError, lambda:
+        im = hopper()
-            hopper().transform((100, 100), None))
+        self.assertRaises(ValueError, im.transform, (100, 100), None)
 
 
 class TestImageTransformAffine(PillowTestCase):

Tests/test_imagecms.py

@@ -144,20 +144,26 @@ class TestImageCms(PillowTestCase):
             'IEC 61966-2.1 Default RGB colour space - sRGB')
 
     def test_exceptions(self):
+        # Test mode mismatch
+        psRGB = ImageCms.createProfile("sRGB")
+        pLab = ImageCms.createProfile("LAB")
+        t = ImageCms.buildTransform(pLab, psRGB, "LAB", "RGB")
+        self.assertRaises(ValueError, t.apply_in_place, hopper("RGBA"))
+
         # the procedural pyCMS API uses PyCMSError for all sorts of errors
         self.assertRaises(
             ImageCms.PyCMSError,
-            lambda: ImageCms.profileToProfile(hopper(), "foo", "bar"))
+            ImageCms.profileToProfile, hopper(), "foo", "bar")
         self.assertRaises(
             ImageCms.PyCMSError,
-            lambda: ImageCms.buildTransform("foo", "bar", "RGB", "RGB"))
+            ImageCms.buildTransform, "foo", "bar", "RGB", "RGB")
         self.assertRaises(
             ImageCms.PyCMSError,
-            lambda: ImageCms.getProfileName(None))
+            ImageCms.getProfileName, None)
         self.skip_missing()
         self.assertRaises(
             ImageCms.PyCMSError,
-            lambda: ImageCms.isIntentSupported(SRGB, None, None))
+            ImageCms.isIntentSupported, SRGB, None, None)
 
     def test_display_profile(self):
         # try fetching the profile for the current display device
@@ -167,6 +173,14 @@ class TestImageCms(PillowTestCase):
         ImageCms.createProfile("LAB", 5000)
         ImageCms.createProfile("LAB", 6500)
 
+    def test_unsupported_color_space(self):
+        self.assertRaises(ImageCms.PyCMSError,
+            ImageCms.createProfile, "unsupported")
+
+    def test_invalid_color_temperature(self):
+        self.assertRaises(ImageCms.PyCMSError,
+            ImageCms.createProfile, "LAB", "invalid")
+
     def test_simple_lab(self):
         i = Image.new('RGB', (10, 10), (128, 128, 128))
 

Tests/test_imagedraw.py

@@ -51,13 +51,11 @@ class TestImageDraw(PillowTestCase):
 
         draw = ImageDraw.Draw(im)
         draw.line(((0, 0)), fill=(0, 0, 0))
-        del draw
 
     def test_mode_mismatch(self):
         im = hopper("RGB").copy()
 
-        self.assertRaises(ValueError,
+        self.assertRaises(ValueError, ImageDraw.ImageDraw, im, mode="L")
-                          lambda: ImageDraw.ImageDraw(im, mode="L"))
 
     def helper_arc(self, bbox, start, end):
         # Arrange
@@ -66,7 +64,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.arc(bbox, start, end)
-        del draw
 
         # Assert
         self.assert_image_similar(
@@ -89,7 +86,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.arc(BBOX1, start=start, end=end)
-        del draw
 
         # Assert
         self.assert_image_equal(
@@ -105,7 +101,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.arc(BBOX1, start=start, end=end)
-        del draw
 
         # Assert
         self.assert_image_similar(
@@ -119,7 +114,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.bitmap((10, 10), small)
-        del draw
 
         # Assert
         self.assert_image_equal(
@@ -133,7 +127,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.chord(bbox, start, end, fill="red", outline="yellow")
-        del draw
 
         # Assert
         self.assert_image_similar(im, Image.open(expected), 1)
@@ -156,7 +149,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.ellipse(bbox, fill="green", outline="blue")
-        del draw
 
         # Assert
         self.assert_image_similar(im, Image.open(expected), 1)
@@ -176,7 +168,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.ellipse(((0, 0), (W-1, H)), fill="white")
-        del draw
 
         # Assert
         self.assert_image_similar(
@@ -189,7 +180,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.line(points, fill="yellow", width=2)
-        del draw
 
         # Assert
         self.assert_image_equal(
@@ -217,7 +207,6 @@ class TestImageDraw(PillowTestCase):
         s.line(x0, y0)
 
         draw.shape(s, fill=1)
-        del draw
 
         # Assert
         self.assert_image_equal(
@@ -239,7 +228,6 @@ class TestImageDraw(PillowTestCase):
         s.line(x0, y0)
 
         draw.shape(s, outline="blue")
-        del draw
 
         # Assert
         self.assert_image_equal(
@@ -252,7 +240,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.pieslice(bbox, start, end, fill="white", outline="blue")
-        del draw
 
         # Assert
         self.assert_image_similar(
@@ -273,7 +260,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.point(points, fill="yellow")
-        del draw
 
         # Assert
         self.assert_image_equal(
@@ -292,7 +278,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.polygon(points, fill="red", outline="blue")
-        del draw
 
         # Assert
         self.assert_image_equal(
@@ -316,7 +301,6 @@ class TestImageDraw(PillowTestCase):
 
             # Act
             draw.polygon(KITE_POINTS, fill="blue", outline="yellow")
-            del draw
 
             # Assert
             self.assert_image_equal(im, Image.open(expected))
@@ -328,7 +312,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.rectangle(bbox, fill="black", outline="green")
-        del draw
 
         # Assert
         self.assert_image_equal(
@@ -350,7 +333,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.rectangle(bbox, fill="orange")
-        del draw
 
         # Assert
         self.assert_image_similar(im, Image.open(expected), 1)
@@ -377,7 +359,6 @@ class TestImageDraw(PillowTestCase):
         # Test that filling outside the image does not change the image
         ImageDraw.floodfill(im, (W, H), red)
         self.assert_image_equal(im, im_floodfill)
-        del draw
 
     @unittest.skipIf(hasattr(sys, 'pypy_version_info'),
                      "Causes fatal RPython error on PyPy")
@@ -394,7 +375,6 @@ class TestImageDraw(PillowTestCase):
         ImageDraw.floodfill(
             im, centre_point, ImageColor.getrgb("red"),
             border=ImageColor.getrgb("black"))
-        del draw
 
         # Assert
         self.assert_image_equal(
@@ -414,8 +394,7 @@ class TestImageDraw(PillowTestCase):
         ImageDraw.floodfill(
             im, centre_point, ImageColor.getrgb("red"),
             thresh=30)
-        del draw
+
-        
         # Assert
         self.assert_image_equal(
             im, Image.open("Tests/images/imagedraw_floodfill2.png"))
@@ -577,7 +556,6 @@ class TestImageDraw(PillowTestCase):
 
         # Act
         draw.line([(50, 50), (50, 50)], width=3)
-        del draw
 
         # Assert
         self.assert_image_similar(im, Image.open(expected), 1)

Tests/test_imagefile.py

@@ -69,7 +69,7 @@ class TestImageFile(PillowTestCase):
             im1, im2 = roundtrip("JPEG")  # lossy compression
             self.assert_image(im1, im2.mode, im2.size)
 
-        self.assertRaises(IOError, lambda: roundtrip("PDF"))
+        self.assertRaises(IOError, roundtrip, "PDF")
 
     def test_ico(self):
         with open('Tests/images/python.ico', 'rb') as f:
@@ -93,7 +93,7 @@ class TestImageFile(PillowTestCase):
         self.assert_image_equal(im1, im2)
 
     def test_raise_ioerror(self):
-        self.assertRaises(IOError, lambda: ImageFile.raise_ioerror(1))
+        self.assertRaises(IOError, ImageFile.raise_ioerror, 1)
 
     def test_raise_typeerror(self):
         with self.assertRaises(TypeError):
@@ -182,7 +182,7 @@ class TestPyDecoder(PillowTestCase):
         self.assertEqual(d.state.xsize, xsize)
         self.assertEqual(d.state.ysize, ysize)
 
-        self.assertRaises(ValueError, lambda: d.set_as_raw(b'\x00'))
+        self.assertRaises(ValueError, d.set_as_raw, b'\x00')
 
     def test_extents_none(self):
         buf = BytesIO(b'\x00'*255)

Tests/test_imagefont.py

@@ -106,7 +106,7 @@ class TestImageFont(PillowTestCase):
         # Usage note:  making two fonts from the same buffer fails.
         # shared_bytes = self._font_as_bytes()
         # self._render(shared_bytes)
-        # self.assertRaises(Exception, lambda: _render(shared_bytes))
+        # self.assertRaises(Exception, _render, shared_bytes)
 
     def test_font_with_open_file(self):
         with open(FONT_PATH, 'rb') as f:
@@ -141,7 +141,6 @@ class TestImageFont(PillowTestCase):
         size = draw.textsize(txt, ttf)
         draw.text((10, 10), txt, font=ttf)
         draw.rectangle((10, 10, 10 + size[0], 10 + size[1]))
-        del draw
 
         target = 'Tests/images/rectangle_surrounding_text.png'
         target_img = Image.open(target)
@@ -188,7 +187,6 @@ class TestImageFont(PillowTestCase):
         draw.text((0, 0), TEST_TEXT, fill=None, font=ttf, anchor=None,
                   spacing=4, align="left")
         draw.text((0, 0), TEST_TEXT, None, ttf, None, 4, "left")
-        del draw
 
         # Test align center and right
         for align, ext in {"center": "_center",
@@ -196,7 +194,6 @@ class TestImageFont(PillowTestCase):
             im = Image.new(mode='RGB', size=(300, 100))
             draw = ImageDraw.Draw(im)
             draw.multiline_text((0, 0), TEST_TEXT, font=ttf, align=align)
-            del draw
 
             target = 'Tests/images/multiline_text'+ext+'.png'
             target_img = Image.open(target)
@@ -211,9 +208,9 @@ class TestImageFont(PillowTestCase):
 
         # Act/Assert
         self.assertRaises(AssertionError,
-                          lambda: draw.multiline_text((0, 0), TEST_TEXT,
+                          draw.multiline_text, (0, 0), TEST_TEXT,
-                                                      font=ttf,
+                                                       font=ttf,
-                                                      align="unknown"))
+                                                       align="unknown")
 
     def test_draw_align(self):
         im = Image.new('RGB', (300, 100), 'white')
@@ -221,7 +218,6 @@ class TestImageFont(PillowTestCase):
         ttf = self.get_font()
         line = "some text"
         draw.text((100, 40), line, (0, 0, 0), font=ttf, align='left')
-        del draw
 
     def test_multiline_size(self):
         ttf = self.get_font()
@@ -236,7 +232,6 @@ class TestImageFont(PillowTestCase):
         # to multiline_textsize()
         draw.textsize(TEST_TEXT, font=ttf, spacing=4)
         draw.textsize(TEST_TEXT, ttf, 4)
-        del draw
 
     def test_multiline_width(self):
         ttf = self.get_font()
@@ -246,7 +241,6 @@ class TestImageFont(PillowTestCase):
         self.assertEqual(draw.textsize("longest line", font=ttf)[0],
                          draw.multiline_textsize("longest line\nline",
                                                  font=ttf)[0])
-        del draw
 
     def test_multiline_spacing(self):
         ttf = self.get_font()
@@ -254,7 +248,6 @@ class TestImageFont(PillowTestCase):
         im = Image.new(mode='RGB', size=(300, 100))
         draw = ImageDraw.Draw(im)
         draw.multiline_text((0, 0), TEST_TEXT, font=ttf, spacing=10)
-        del draw
 
         target = 'Tests/images/multiline_text_spacing.png'
         target_img = Image.open(target)
@@ -279,7 +272,6 @@ class TestImageFont(PillowTestCase):
         # Rotated font
         draw.font = transposed_font
         box_size_b = draw.textsize(word)
-        del draw
 
         # Check (w,h) of box a is (h,w) of box b
         self.assertEqual(box_size_a[0], box_size_b[1])
@@ -302,7 +294,6 @@ class TestImageFont(PillowTestCase):
         # Rotated font
         draw.font = transposed_font
         box_size_b = draw.textsize(word)
-        del draw
 
         # Check boxes a and b are same size
         self.assertEqual(box_size_a, box_size_b)
@@ -384,7 +375,7 @@ class TestImageFont(PillowTestCase):
         filename = "somefilenamethatdoesntexist.ttf"
 
         # Act/Assert
-        self.assertRaises(IOError, lambda: ImageFont.load_path(filename))
+        self.assertRaises(IOError, ImageFont.load_path, filename)
 
     def test_default_font(self):
         # Arrange
@@ -398,7 +389,6 @@ class TestImageFont(PillowTestCase):
         # Act
         default_font = ImageFont.load_default()
         draw.text((10, 10), txt, font=default_font)
-        del draw
 
         # Assert
         self.assert_image_equal(im, target_img)

Tests/test_imagemorph.py

@@ -81,9 +81,9 @@ class MorphTests(PillowTestCase):
 
     def test_no_operator_loaded(self):
         mop = ImageMorph.MorphOp()
-        self.assertRaises(Exception, lambda: mop.apply(None))
+        self.assertRaises(Exception, mop.apply, None)
-        self.assertRaises(Exception, lambda: mop.match(None))
+        self.assertRaises(Exception, mop.match, None)
-        self.assertRaises(Exception, lambda: mop.save_lut(None))
+        self.assertRaises(Exception, mop.save_lut, None)
 
     # Test the named patterns
     def test_erosion8(self):
@@ -214,9 +214,9 @@ class MorphTests(PillowTestCase):
         im = hopper('RGB')
         mop = ImageMorph.MorphOp(op_name="erosion8")
 
-        self.assertRaises(Exception, lambda: mop.apply(im))
+        self.assertRaises(Exception, mop.apply, im)
-        self.assertRaises(Exception, lambda: mop.match(im))
+        self.assertRaises(Exception, mop.match, im)
-        self.assertRaises(Exception, lambda: mop.get_on_pixels(im))
+        self.assertRaises(Exception, mop.get_on_pixels, im)
 
     def test_add_patterns(self):
         # Arrange
@@ -240,7 +240,7 @@ class MorphTests(PillowTestCase):
     def test_unknown_pattern(self):
         self.assertRaises(
             Exception,
-            lambda: ImageMorph.LutBuilder(op_name='unknown'))
+            ImageMorph.LutBuilder, op_name='unknown')
 
     def test_pattern_syntax_error(self):
         # Arrange
@@ -249,9 +249,7 @@ class MorphTests(PillowTestCase):
         lb.add_patterns(new_patterns)
 
         # Act / Assert
-        self.assertRaises(
+        self.assertRaises(Exception, lb.build_lut)
-            Exception,
-            lambda: lb.build_lut())
 
     def test_load_invalid_mrl(self):
         # Arrange
@@ -259,7 +257,7 @@ class MorphTests(PillowTestCase):
         mop = ImageMorph.MorphOp()
 
         # Act / Assert
-        self.assertRaises(Exception, lambda: mop.load_lut(invalid_mrl))
+        self.assertRaises(Exception, mop.load_lut, invalid_mrl)
 
     def test_roundtrip_mrl(self):
         # Arrange

Tests/test_imageops_usm.py

@@ -37,26 +37,26 @@ class TestImageOpsUsm(PillowTestCase):
     def test_usm_formats(self):
 
         usm = ImageOps.unsharp_mask
-        self.assertRaises(ValueError, lambda: usm(im.convert("1")))
+        self.assertRaises(ValueError, usm, im.convert("1"))
         usm(im.convert("L"))
-        self.assertRaises(ValueError, lambda: usm(im.convert("I")))
+        self.assertRaises(ValueError, usm, im.convert("I"))
-        self.assertRaises(ValueError, lambda: usm(im.convert("F")))
+        self.assertRaises(ValueError, usm, im.convert("F"))
         usm(im.convert("RGB"))
         usm(im.convert("RGBA"))
         usm(im.convert("CMYK"))
-        self.assertRaises(ValueError, lambda: usm(im.convert("YCbCr")))
+        self.assertRaises(ValueError, usm, im.convert("YCbCr"))
 
     def test_blur_formats(self):
 
         blur = ImageOps.gaussian_blur
-        self.assertRaises(ValueError, lambda: blur(im.convert("1")))
+        self.assertRaises(ValueError, blur, im.convert("1"))
         blur(im.convert("L"))
-        self.assertRaises(ValueError, lambda: blur(im.convert("I")))
+        self.assertRaises(ValueError, blur, im.convert("I"))
-        self.assertRaises(ValueError, lambda: blur(im.convert("F")))
+        self.assertRaises(ValueError, blur, im.convert("F"))
         blur(im.convert("RGB"))
         blur(im.convert("RGBA"))
         blur(im.convert("CMYK"))
-        self.assertRaises(ValueError, lambda: blur(im.convert("YCbCr")))
+        self.assertRaises(ValueError, blur, im.convert("YCbCr"))
 
     def test_usm_accuracy(self):
 

Tests/test_imagepalette.py

@@ -2,56 +2,54 @@ from helper import unittest, PillowTestCase
 
 from PIL import ImagePalette, Image
 
-ImagePalette = ImagePalette.ImagePalette
-
 
 class TestImagePalette(PillowTestCase):
 
     def test_sanity(self):
 
-        ImagePalette("RGB", list(range(256))*3)
+        ImagePalette.ImagePalette("RGB", list(range(256))*3)
-        self.assertRaises(
+        self.assertRaises(ValueError,
-            ValueError, lambda: ImagePalette("RGB", list(range(256))*2))
+            ImagePalette.ImagePalette, "RGB", list(range(256))*2)
 
     def test_getcolor(self):
 
-        palette = ImagePalette()
+        palette = ImagePalette.ImagePalette()
 
         test_map = {}
         for i in range(256):
             test_map[palette.getcolor((i, i, i))] = i
 
         self.assertEqual(len(test_map), 256)
-        self.assertRaises(ValueError, lambda: palette.getcolor((1, 2, 3)))
+        self.assertRaises(ValueError, palette.getcolor, (1, 2, 3))
+
+        # Test unknown color specifier
+        self.assertRaises(ValueError, palette.getcolor, "unknown")
 
     def test_file(self):
 
-        palette = ImagePalette("RGB", list(range(256))*3)
+        palette = ImagePalette.ImagePalette("RGB", list(range(256))*3)
 
         f = self.tempfile("temp.lut")
 
         palette.save(f)
 
-        from PIL.ImagePalette import load, raw
+        p = ImagePalette.load(f)
-
-        p = load(f)
 
         # load returns raw palette information
         self.assertEqual(len(p[0]), 768)
         self.assertEqual(p[1], "RGB")
 
-        p = raw(p[1], p[0])
+        p = ImagePalette.raw(p[1], p[0])
-        self.assertIsInstance(p, ImagePalette)
+        self.assertIsInstance(p, ImagePalette.ImagePalette)
         self.assertEqual(p.palette, palette.tobytes())
 
     def test_make_linear_lut(self):
         # Arrange
-        from PIL.ImagePalette import make_linear_lut
         black = 0
         white = 255
 
         # Act
-        lut = make_linear_lut(black, white)
+        lut = ImagePalette.make_linear_lut(black, white)
 
         # Assert
         self.assertIsInstance(lut, list)
@@ -63,22 +61,19 @@ class TestImagePalette(PillowTestCase):
     def test_make_linear_lut_not_yet_implemented(self):
         # Update after FIXME
         # Arrange
-        from PIL.ImagePalette import make_linear_lut
         black = 1
         white = 255
 
         # Act
-        self.assertRaises(
+        self.assertRaises(NotImplementedError,
-            NotImplementedError,
+            ImagePalette.make_linear_lut, black, white)
-            lambda: make_linear_lut(black, white))
 
     def test_make_gamma_lut(self):
         # Arrange
-        from PIL.ImagePalette import make_gamma_lut
         exp = 5
 
         # Act
-        lut = make_gamma_lut(exp)
+        lut = ImagePalette.make_gamma_lut(exp)
 
         # Assert
         self.assertIsInstance(lut, list)
@@ -92,19 +87,18 @@ class TestImagePalette(PillowTestCase):
 
     def test_rawmode_valueerrors(self):
         # Arrange
-        from PIL.ImagePalette import raw
+        palette = ImagePalette.raw("RGB", list(range(256))*3)
-        palette = raw("RGB", list(range(256))*3)
 
         # Act / Assert
         self.assertRaises(ValueError, palette.tobytes)
-        self.assertRaises(ValueError, lambda: palette.getcolor((1, 2, 3)))
+        self.assertRaises(ValueError, palette.getcolor, (1, 2, 3))
         f = self.tempfile("temp.lut")
-        self.assertRaises(ValueError, lambda: palette.save(f))
+        self.assertRaises(ValueError, palette.save, f)
 
     def test_getdata(self):
         # Arrange
         data_in = list(range(256))*3
-        palette = ImagePalette("RGB", data_in)
+        palette = ImagePalette.ImagePalette("RGB", data_in)
 
         # Act
         mode, data_out = palette.getdata()
@@ -114,9 +108,8 @@ class TestImagePalette(PillowTestCase):
 
     def test_rawmode_getdata(self):
         # Arrange
-        from PIL.ImagePalette import raw
         data_in = list(range(256))*3
-        palette = raw("RGB", data_in)
+        palette = ImagePalette.raw("RGB", data_in)
 
         # Act
         rawmode, data_out = palette.getdata()
@@ -138,6 +131,10 @@ class TestImagePalette(PillowTestCase):
 
         self.assert_image_equal(img, reloaded)
 
+    def test_invalid_palette(self):
+        self.assertRaises(IOError,
+            ImagePalette.load, "Tests/images/hopper.jpg")
+
 
 if __name__ == '__main__':
     unittest.main()

Tests/test_imagesequence.py

@@ -22,7 +22,7 @@ class TestImageSequence(PillowTestCase):
 
         self.assertEqual(index, 1)
 
-        self.assertRaises(AttributeError, lambda: ImageSequence.Iterator(0))
+        self.assertRaises(AttributeError, ImageSequence.Iterator, 0)
 
     def test_iterator(self):
         im = Image.open('Tests/images/multipage.tiff')
@@ -30,7 +30,7 @@ class TestImageSequence(PillowTestCase):
         for index in range(0, im.n_frames):
             self.assertEqual(i[index], next(i))
         self.assertRaises(IndexError, lambda: i[index+1])
-        self.assertRaises(StopIteration, lambda: next(i))
+        self.assertRaises(StopIteration, next, i)
 
     def _test_multipage_tiff(self):
         im = Image.open('Tests/images/multipage.tiff')

Tests/test_imageshow.py

@@ -1,4 +1,4 @@
-from helper import unittest, PillowTestCase
+from helper import unittest, PillowTestCase, hopper
 
 from PIL import Image
 from PIL import ImageShow
@@ -10,12 +10,30 @@ class TestImageShow(PillowTestCase):
         dir(Image)
         dir(ImageShow)
 
+    def test_register(self):
+        # Test registering a viewer that is not a class
+        ImageShow.register("not a class")
+
+    def test_show(self):
+        class TestViewer:
+            methodCalled = False
+
+            def show(self, image, title=None, **options):
+                self.methodCalled = True
+                return True
+        viewer = TestViewer()
+        ImageShow.register(viewer, -1)
+
+        im = hopper()
+        self.assertTrue(ImageShow.show(im))
+        self.assertTrue(viewer.methodCalled)
+
     def test_viewer(self):
         viewer = ImageShow.Viewer()
 
         self.assertIsNone(viewer.get_format(None))
 
-        self.assertRaises(NotImplementedError, lambda: viewer.get_command(None))
+        self.assertRaises(NotImplementedError, viewer.get_command, None)
 
 
 if __name__ == '__main__':

Tests/test_imagestat.py

@@ -26,7 +26,7 @@ class TestImageStat(PillowTestCase):
 
         self.assertRaises(AttributeError, lambda: st.spam)
 
-        self.assertRaises(TypeError, lambda: ImageStat.Stat(1))
+        self.assertRaises(TypeError, ImageStat.Stat, 1)
 
     def test_hopper(self):
 

Tests/test_lib_image.py

@@ -29,8 +29,8 @@ class TestLibImage(PillowTestCase):
         im.im.setmode("RGB")
         self.assertEqual(im.im.getpixel((0, 0)), (1, 2, 3))
 
-        self.assertRaises(ValueError, lambda: im.im.setmode("L"))
+        self.assertRaises(ValueError, im.im.setmode, "L")
-        self.assertRaises(ValueError, lambda: im.im.setmode("RGBABCDE"))
+        self.assertRaises(ValueError, im.im.setmode, "RGBABCDE")
 
 
 if __name__ == '__main__':

Tests/test_numpy.py

@@ -60,7 +60,7 @@ class TestNumpy(PillowTestCase):
         # Check supported 1-bit integer formats
         self.assert_image(to_image(numpy.bool, 1, 1), '1', TEST_IMAGE_SIZE)
         self.assert_image(to_image(numpy.bool8, 1, 1), '1', TEST_IMAGE_SIZE)
-        
+
         # Check supported 8-bit integer formats
         self.assert_image(to_image(numpy.uint8), "L", TEST_IMAGE_SIZE)
         self.assert_image(to_image(numpy.uint8, 3), "RGB", TEST_IMAGE_SIZE)
@@ -86,12 +86,12 @@ class TestNumpy(PillowTestCase):
         self.assert_image(to_image(numpy.int32), "I", TEST_IMAGE_SIZE)
 
         # Check 64-bit integer formats
-        self.assertRaises(TypeError, lambda: to_image(numpy.uint64))
+        self.assertRaises(TypeError, to_image, numpy.uint64)
-        self.assertRaises(TypeError, lambda: to_image(numpy.int64))
+        self.assertRaises(TypeError, to_image, numpy.int64)
 
         # Check floating-point formats
         self.assert_image(to_image(numpy.float), "F", TEST_IMAGE_SIZE)
-        self.assertRaises(TypeError, lambda: to_image(numpy.float16))
+        self.assertRaises(TypeError, to_image, numpy.float16)
         self.assert_image(to_image(numpy.float32), "F", TEST_IMAGE_SIZE)
         self.assert_image(to_image(numpy.float64), "F", TEST_IMAGE_SIZE)
 
@@ -216,7 +216,7 @@ class TestNumpy(PillowTestCase):
     def test_bool(self):
         # https://github.com/python-pillow/Pillow/issues/2044
         a = numpy.zeros((10,2), dtype=numpy.bool)
-        a[0][0] = True 
+        a[0][0] = True
 
         im2 = Image.fromarray(a)
         self.assertEqual(im2.getdata()[0], 255)