How can I test my receive address? I downloaded the original software of Bitcoin at bitcoin.org.
I just created a receive-address. How do I know it will work? How can I test it?
An easy test is to sign a message using your private key and then verify the message using your public key (your receive address).  This can be done using Bitcoin-Qt by selecting File->Sign Message.  


Sign a message by entering your receive address and some message text (anything you want).  Select Sign Message.  Copy the signature to the clipboard
Verify the message by entering your receive address and the message text (exactly as you entered it for signing).  Then paste the copied signature into the signature field.  Select Verify Message.
If everything is working correctly, you should get a message verified status.