Beefed up the tests a bit.

branches/pycon-multidb/src/ZODB/tests/testmultidb.py

@@ -50,7 +50,7 @@ Trying to insert a database with a name that is already in use will not work:
 ...     database_name='root',
 ...     databases=db.databases)
 Traceback (most recent call last):
-    ... fancy traceback here ...
+    ...
 ValueError: database_name 'root' already in databases
 
 You can (still) get a connection to a database this way:
@@ -79,6 +79,29 @@ True
 >>> len(cn2.connections)
 2
 
+So long as this database group remains open, the same Connection objects
+are returned:
+
+>>> cn.get_connection('root') is cn
+True
+>>> cn.get_connection('notroot') is cn2
+True
+>>> cn2.get_connection('root') is cn
+True
+>>> cn2.get_connection('notroot') is cn2
+True
+
+Of course trying to get a non-existent named database doesn't work:
+
+>>> cn.get_connection('no way')
+Traceback (most recent call last):
+  ...
+KeyError: 'no way'
+
+Clean up:
+
+>>> for a_db in db.databases.values():
+...     a_db.close()
 """
 
 from zope.testing import doctest