You can manually test your bot using the "Check Status" button from the Twitter page from your bot's "Admin Console".
First go to the "Log" page and set logging to "FINE" then click on "Check Status" from the "Twitter" page, and go back to the "Log" page to see what occurred.
You can also add an "Auto Tweet" to verify your bot can tweet to your account. You can enter -1 in the "Auto Tweet Hours" field to force it to auto tweets every time it runs.
Note that Twitter may reject tweets if it thinks they are duplicates or spam, or if your account has exceeded it API usage quota.