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diff --git a/test/reader/preview/test_utils.py b/test/reader/preview/test_utils.py
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+++ b/test/reader/preview/test_utils.py
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+"""
+
+Part of the bsie test suite.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# 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 ##