[Cryptech Tech] More tests and a bug

[Joachim Strömbergson]

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Aloha!

Rob Austein wrote:
> Python has a unit test framework, and there is a pyexpect package if 
> it comes to that; don't know how hard it would be to integrate the 
> latter into the former.

I like the Python unit test framework.

The problem I have right now is not related to the question of doing
unit tests or not. But how to handle async read and write and still be
able to catch the specific response to a command and parse the response
to have something to do unit test assertion on.

hash_tester currently have a response thread that handles read
operations and parsing from the serial interface. The main thread
creates the reader thread and then sends commands to coretest in the
FPGA via the serial interface. In order to be able to do unit testing I
need the reader process to be able to match responses with commands. And
still not end up synchronize the communication.

The idea I have right now is to create a third thread that are connected
to the main thread and the reader thread with two Python queues. This
thread is responsible for doing the specific matching.

We now that the order of commands and responses are strictly ordered so
there are no real issue with doing a wrong match related to the same
address.

The reader could do the matching as well as the reading. But it looks
like a good separation of duty having a separate thread and it allows
the reader thread to be more responsive. Esp when we start increase the
bitrate. The long message tests I'm doing now (with 10000 block
messages) takes LONG time over 9600 kbps.

- -- 
Med vänlig hälsning, Yours

Joachim Strömbergson - Alltid i harmonisk svängning.
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 Joachim Strömbergson          Secworks AB          joachim at secworks.se
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