Added test for regression on SourceForge bug #117490.

Lib/test/output/test_mailbox

+test_mailbox
+newly created maildir contains 0 messages

Lib/test/test_mailbox.py

+import mailbox
+import os
+import test_support
+
+# create a new maildir mailbox to work with:
+curdir = os.path.join(test_support.TESTFN, "cur")
+newdir = os.path.join(test_support.TESTFN, "new")
+try:
+    os.mkdir(test_support.TESTFN)
+    os.mkdir(curdir)
+    os.mkdir(newdir)
+
+    # Test for regression on bug #117490:
+    # http://sourceforge.net/bugs/?func=detailbug&bug_id=117490&group_id=5470
+    # Make sure the boxes attribute actually gets set.
+    mbox = mailbox.Maildir(test_support.TESTFN)
+    mbox.boxes
+    print "newly created maildir contains", len(mbox.boxes), "messages"
+
+    # XXX We still need more tests!
+
+finally:
+    try: os.rmdir(newdir)
+    except IOError: pass
+    try: os.rmdir(curdir)
+    except IOError: pass
+    try: os.rmdir(test_support.TESTFN)
+    except IOError: pass