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# standard imports
from functools import partial
import importlib
import os
import unittest
# external imports
import PIL.Image
# bsie imports
from bsie.utils import errors
# objects to test
from bsie.reader.preview import Preview
## code ##
class TestPreview(unittest.TestCase):
def setUp(self):
if __package__ is None or __package__ == '': # direct call or local discovery
importlib.import_module('load_nef', __package__).get()
else: # parent discovery
importlib.import_module('.load_nef', __package__).get()
def test_construct(self):
preview = Preview()
self.assertIsInstance(preview, Preview)
self.assertEqual(len(preview._children), 3)
def test_call(self):
preview = Preview()
# call raises error if file cannot be read
self.assertRaises(errors.ReaderError, preview,
os.path.join(os.path.dirname(__file__), 'missing.jpg'))
self.assertRaises(errors.ReaderError, preview(
os.path.join(os.path.dirname(__file__), 'invalid.jpg')), 10)
self.assertRaises(errors.UnsupportedFileFormatError, preview,
os.path.join(os.path.dirname(__file__), 'invalid.foo'))
# call returns raw preview
gen = preview(os.path.join(os.path.dirname(__file__), 'testimage.nef'))
img = gen(10)
self.assertIsInstance(img, PIL.Image.Image)
self.assertEqual(img.size, (10, 8))
self.assertEqual(sum(band for pix in img.getdata() for band in pix), 25287)
img.close()
# call returns jpeg image
gen = preview(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(band for pix in img.getdata() for band in pix), 0)
img.close()
# preview generator can also extract data from non-image files
gen = preview(os.path.join(os.path.dirname(__file__), 'testfile.pdf'))
img = gen(10)
self.assertIsInstance(img, PIL.Image.Image)
self.assertEqual(img.size, (8, 10))
self.assertEqual(sum(img.getdata()), 20258)
img.close()
## main ##
if __name__ == '__main__':
unittest.main()
## EOF ##
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