Here we have several test programs for use with the gr-trellis implementation.
Documentation can be found in 
http://gnuradio.utah.edu/svn/gnuradio/trunk/gr-trellis/doc/gr-trellis.html

fsm_utils.py contains several useful functions.

fsm_files is a directory with some FSM definitions

If you just want to see what these programs do, run each of the following:

./test_tcm.py fsm_files/awgn1o2_4.fsm 10.0 1000
./test_tcm1.py fsm_files/awgn1o2_4.fsm 10.0 1000
./test_tcm_combined.py fsm_files/awgn1o2_4.fsm 10.0 1000
./test_tcm_parallel.py fsm_files/awgn1o2_4.fsm 10.0 1000
./test_sccc_hard.py fsm_files/awgn1o2_4.fsm fsm_files/awgn1o2_4.fsm 10.0 1000

In your terminal you will see something like this:

[anastas@ernesto channel-coding]$ ./test_tcm.py fsm_files/awgn1o2_4.fsm 6.0 1000
100 1024 1 103424 10 9.668936e-05
200 1024 1 205824 21 1.020289e-04
300 1024 0 308224 40 1.297757e-04
400 1024 0 410624 1074 2.615531e-03
500 1024 0 513024 1081 2.107114e-03
600 1024 0 615424 1090 1.771137e-03
700 1024 0 717824 1097 1.528230e-03
800 1024 0 820224 1107 1.349631e-03
900 1024 0 922624 1120 1.213929e-03
1024000 1129 1.102539e-03

1.102539e-03 is the error rate estimates by sending 1000 packets of
1024x16 bits each using an 1/2 4-state convolutional code and QPSK
modulation through an AWGN with Es/N0 = 6.0 dB