'Check DX10 images can be opened'

def test_dx10_bc7(self):

    target = Image.open(TEST_FILE_DX10_BC7.replace('.dds', '.png'))
    im = Image.open(TEST_FILE_DX10_BC7)
    im.load()
    self.assertEqual(im.format, 'DDS')
    self.assertEqual(im.mode, 'RGBA')
    self.assertEqual(im.size, (256, 256))
    self.assert_image_equal(target, im)
