Move test function to test file

notebook/_version.py

@@ -9,14 +9,13 @@ store the current version info of the notebook.
 
 # Next beta/alpha/rc release: The version number for beta is X.Y.ZbN **without dots**. 
 
-version_info = (4, 1, '0b1')
+version_info = (4, 1, 0, 'b1')
 __version__ = '.'.join(map(str, version_info[:3])) + ''.join(version_info[3:])
+
 import re
 
 pep440re = re.compile('^(\d+)\.(\d+)\.(\d+((a|b|rc)\d+)?)(\.post\d+)?(\.dev\d+)?$')
 
-
-
 def raise_on_bad_version(version):
     if not pep440re.match(version):
         raise ValueError("Versions String does apparently not match Pep 440 specification, "

notebook/tests/test_notebookapp.py

@@ -3,6 +3,7 @@
 
 import logging
 import os
+import re
 from tempfile import NamedTemporaryFile
 
 import nose.tools as nt
@@ -15,8 +16,6 @@ from traitlets import TraitError
 from notebook import notebookapp, __version__
 NotebookApp = notebookapp.NotebookApp
 
-from notebook._version import raise_on_bad_version
-
 
 def test_help_output():
     """ipython notebook --help-all works"""
@@ -100,5 +99,16 @@ def test_pep440_version():
 
         yield (raise_on_bad_version, version)
 
+
+
+pep440re = re.compile('^(\d+)\.(\d+)\.(\d+((a|b|rc)\d+)?)(\.post\d+)?(\.dev\d+)?$')
+
+def raise_on_bad_version(version):
+    if not pep440re.match(version):
+        raise ValueError("Versions String does apparently not match Pep 440 specification, "
+                         "which might lead to sdist and wheel being seen as 2 different release. "
+                         "E.g: do not use dots for beta/alpha/rc markers.")
+
+
 def test_current_version():
     raise_on_bad_version(__version__)