How to define test cases for a simple one to one chat application?

I can envision a few test cases:





1. Client1 can connect to server/other client.


2. Client2 can connect to server/other client.


3. If authentication required, authentication to server successful.


4. If authentication required, authentication to server failed (does app handle gracefully?).


5. Client1 can send message.


6. Client1 message received by Client2 (correct format, etc.)


7. Client2 can send message.


8. Client2 message received by Client1 (correct format, etc.)





Granted 5/6 and 7/8 are identical in opposite directions, but would validate the ';server's'; ability to handle multiple clients at the same time and route messages accordingly.

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