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# standard imports
from functools import partial
import os
import unittest
# external imports
import PIL.Image
# bsie imports
from bsie.utils import errors
# objects to test
from bsie.reader.preview._pillow import PillowPreviewReader
## code ##
class TestPillowPreviewReader(unittest.TestCase):
def test_call(self):
rdr = PillowPreviewReader()
# raises exception when image cannot be read
self.assertRaises(errors.UnsupportedFileFormatError, rdr,
os.path.join(os.path.dirname(__file__), 'invalid.jpg'))
# raises exception when image cannot be read
self.assertRaises(errors.ReaderError, rdr,
os.path.join(os.path.dirname(__file__), 'inexistent.jpg'))
# raises exception when image has invalid type
self.assertRaises(errors.UnsupportedFileFormatError, rdr,
os.path.join(os.path.dirname(__file__), 'invalid.foo'))
# proper file produces a generator
gen = rdr(os.path.join(os.path.dirname(__file__), 'testimage.jpg'))
self.assertIsInstance(gen, partial)
# generator produces an image
img = gen(10)
self.assertIsInstance(img, PIL.Image.Image)
self.assertEqual(img.size, (10, 10))
self.assertEqual(sum(band for pix in img.getdata() for band in pix), 0)
# cleanup
img.close()
## main ##
if __name__ == '__main__':
unittest.main()
## EOF ##
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