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# standard imports
from functools import partial
import os
import shutil
import tempfile
import unittest
# external imports
import PIL.Image
# bsie imports
from bsie.utils import errors
# objects to test
from bsie.reader.preview._pg import PreviewGeneratorReader
## code ##
class TestPreviewGeneratorReader(unittest.TestCase):
def test_call(self):
rdr = PreviewGeneratorReader()
# inexistent file raises a ReaderError
self.assertRaises(errors.ReaderError, rdr,
os.path.join(os.path.dirname(__file__), 'missing.jpg'))
# unsupported file type raises an UnsupportedFileFormatError
self.assertRaises(errors.UnsupportedFileFormatError, rdr,
os.path.join(os.path.dirname(__file__), 'invalid.foo'))
# invalid file raises a ReaderError
self.assertRaises(errors.ReaderError,
rdr(os.path.join(os.path.dirname(__file__), 'invalid.jpg')), 100)
# 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(img.getdata()), 0)
# cleanup
img.close()
# preview generator can also extract data from non-image files
gen = rdr(os.path.join(os.path.dirname(__file__), 'testfile.pdf'))
self.assertIsInstance(gen, partial)
# generator produces an image
img = gen(10)
self.assertIsInstance(img, PIL.Image.Image)
self.assertEqual(img.size, (8, 10))
self.assertEqual(sum(img.getdata()), 20258)
# cleanup
img.close()
# can define a cache dir
pg_dir = tempfile.mkdtemp(prefix='bsie-test')
self.assertTrue(os.path.exists(pg_dir))
rdr = PreviewGeneratorReader(cache=pg_dir)
gen = rdr(os.path.join(os.path.dirname(__file__), 'testimage.jpg'))
img = gen(10)
self.assertIsInstance(img, PIL.Image.Image)
self.assertEqual(img.size, (10, 10))
self.assertEqual(sum(img.getdata()), 0)
img.close()
del rdr
# cache dir still exists after instance deletion
self.assertTrue(os.path.exists(pg_dir))
shutil.rmtree(pg_dir, ignore_errors=True)
## main ##
if __name__ == '__main__':
unittest.main()
## EOF ##
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