Fixes issue #25, adds unit tests and release 3.2.1

docs @ f700c239

-Subproject commit e8e0d21ccc8121fc30e1296a05dadb8aa9e22efa
+Subproject commit f700c239f8f9d7d1f99a3c10d9f67e2b3b8ef307

nd2reader/__init__.py

 from nd2reader.reader import ND2Reader
 from nd2reader.legacy import Nd2
 
-__version__ = '3.2.0'
+__version__ = '3.2.1'

setup.py

 from setuptools import setup
 
-VERSION = '3.2.0'
+VERSION = '3.2.1'
 
 if __name__ == '__main__':
     setup(

sphinx/conf.py

@@ -44,9 +44,9 @@ author = 'Ruben Verweij'
 # built documents.
 #
 # The short X.Y version.
-version = '3.2.0'
+version = '3.2.1'
 # The full version, including alpha/beta/rc tags.
-release = '3.2.0'
+release = '3.2.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

tests/test_reader.py

 import unittest
 import numpy as np
+import struct
 
+from pims import Frame
 from nd2reader.artificial import ArtificialND2
 from nd2reader.exceptions import EmptyFileError
 from nd2reader.reader import ND2Reader
@@ -41,3 +43,26 @@ class TestReader(unittest.TestCase):
             with ND2Reader('test_data/test_nd2_reader.nd2') as reader:
                 timesteps = reader.timesteps
                 self.assertEquals(len(timesteps), 0)
+
+    def test_get_frame_2D(self):
+        # Best test we can do for now:
+        # test everything up to the actual unpacking of the frame data
+        with ArtificialND2('test_data/test_nd2_reader.nd2') as _:
+            with ND2Reader('test_data/test_nd2_reader.nd2') as reader:
+
+                with self.assertRaises(struct.error) as exception:
+                    frame = reader.get_frame_2D(c=0, t=0, z=0, x=0, y=0, v=0)
+
+                self.assertEqual(str(exception.exception), "unpack requires a buffer of 8 bytes")
+
+    def test_get_frame_vczyx(self):
+        # Best test we can do for now:
+        # test everything up to the actual unpacking of the frame data
+        with ArtificialND2('test_data/test_nd2_reader.nd2') as _:
+            with ND2Reader('test_data/test_nd2_reader.nd2') as reader:
+
+                with self.assertRaises(struct.error) as exception:
+                    frame = reader.get_frame_vczyx(c=0, t=0, z=0, x=0, y=0, v=0)
+
+                self.assertEqual(str(exception.exception), "unpack requires a buffer of 8 bytes")
+