# standard imports
import os
import unittest

# external imports
import PIL.Image

# objects to test
from bsie.reader.preview.utils import resize


## code ##

class TestUtils(unittest.TestCase):

    def test_resize(self):
        img = PIL.Image.open(os.path.join(os.path.dirname(__file__), 'testimage.jpg'))
        landscape = img.resize((100, 80))
        portrait = img.resize((80, 100))
        self.assertEqual(img.size, (100, 100))
        self.assertEqual(landscape.size, (100, 80))
        self.assertEqual(portrait.size, (80, 100))
        # resize can downscale
        self.assertEqual(resize(img, 10).size, (10, 10))
        self.assertEqual(resize(img, 20).size, (20, 20))
        # resize can upscale
        self.assertEqual(resize(img, 200).size, (200, 200))
        # aspect ratio is preserved
        self.assertEqual(resize(landscape, 10).size, (10, 8))
        self.assertEqual(resize(portrait, 10).size, (8, 10))


## main ##

if __name__ == '__main__':
    unittest.main()

## EOF ##