ReaderChain and image reader

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diff --git a/test/reader/image/test_raw_image.py b/test/reader/image/test_raw_image.py
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+++ b/test/reader/image/test_raw_image.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 importlib
+import os
+import unittest
+
+# external imports
+import PIL.Image
+
+# bsie imports
+from bsie.utils import errors
+
+# objects to test
+from bsie.reader.image._raw import RawImage
+
+
+## code ##
+
+class TestRawImage(unittest.TestCase):
+    def setUp(self):
+        importlib.import_module(__package__ + '.load_nef').get()
+
+    def test_call(self):
+        rdr = RawImage()
+        # returns PIL image
+        img = rdr(os.path.join(os.path.dirname(__file__), 'testimage.nef'))
+        self.assertEqual(img.size, (6016, 4016)) # FIXME: change when image was replaced
+        #self.assertEqual(img.size, (1, 1))
+        #self.assertEqual(img.getdata().getpixel((0, 0)), (0, 0, 0))
+        img.close()
+        # raises exception when image cannot be read
+        self.assertRaises(errors.ReaderError, rdr,
+            os.path.join(os.path.dirname(__file__), 'invalid.nef'))
+        self.assertRaises(errors.ReaderError, rdr,
+            os.path.join(os.path.dirname(__file__), 'testimage.jpg'))
+
+
+
+
+## main ##
+
+if __name__ == '__main__':
+    unittest.main()
+
+## EOF ##