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 6.0 1000
./test_tcm1.py fsm_files/awgn1o2_4.fsm 6.0 1000
./test_tcm2.py 6.0 1000
./test_tcm_combined.py fsm_files/awgn1o2_4.fsm 6.0 1000
./test_tcm_parallel.py fsm_files/awgn1o2_4.fsm 6.0 1000

./test_sccc_hard.py  fsm_files/awgn1o2_4.fsm fsm_files/awgn1o2_4_msb.fsm 10.0 100
./test_sccc_soft.py  fsm_files/awgn1o2_4.fsm fsm_files/awgn1o2_4_msb.fsm  8.0 100
./test_sccc_turbo.py fsm_files/awgn1o2_4.fsm fsm_files/awgn1o2_4_msb.fsm  5.0 100

In your terminal you will see something like this:

$ ./test_tcm.py fsm_files/awgn1o2_4.fsm 6.0 1000
100 98 9.80e-01 102400 9 8.79e-05
200 198 9.90e-01 204800 20 9.77e-05
300 298 9.93e-01 307200 40 1.30e-04
400 398 9.95e-01 409600 1074 2.62e-03
500 498 9.96e-01 512000 1081 2.11e-03
600 598 9.97e-01 614400 1090 1.77e-03
700 698 9.97e-01 716800 1097 1.53e-03
800 798 9.98e-01 819200 1107 1.35e-03
900 898 9.98e-01 921600 1120 1.22e-03
1000 998 9.98e-01 1024000 1129 1.10e-03
1000 998 9.98e-01 1024000 1129 1.10e-03

which gives you information about the:
number of transmitted packets
number of packets in error
iestimated packet error rate
number of transmitted shorts
number of shorts in error
estimated (short) error rate 

1.10e-03 is the error rate estimate by sending 1000 packets of
1024 shorts each, using an 1/2 4-state convolutional code and QPSK
modulation through an AWGN with Es/N0 = 6.0 dB