Test removeContact.
Rewrite testAddContact_full.
Test keyInRange.
Test len.
Cosmetic fix.
Rewrite testGetContacts for default case.
Test getContacts when count is given.
Do not comment the obvious.
Use assertRaises as context manager for better readability.
Visually separate right from wrong testcases.
Add provision for running test without nosetest support.
Remove execute flag.