cdetrio/pyeth_trace_howto.md

## pyeth_trace_howto.md

      
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              pyeth_trace_howto.md
            
          
    Instructions for generating EVM traces of state tests in pyethereum

Step 1. Install pyethereum modules and pytest

I'd suggest using pipenv.
mkdir pyeth
cd pyeth
pipenv --three

Then install pyethereum modules and pytest.
pipenv install git+https://github.com/ethereum/py_pairing.git@5f609da9222bbd8b0d6ba061b45406808a9fc51b#egg=py_ecc

pipenv install git+https://github.com/ethereum/pyethereum.git@a6875c8ddc4b11c5a3707534a63bdab22e7b2a59#egg=ethereum

pipenv install pycryptodome

pipenv install pytest

Now clone pyethereum and fetch the tests submodule (i.e. pyethereum/fixtures).
git clone https://github.com/ethereum/pyethereum.git
cd pyethereum
git checkout a6875c8ddc4b11c5a3707534a63bdab22e7b2a59
git submodule update --init

Step 2. Fix pyethereum

Open ethereum/specials.py and edit:
from py_ecc.secp256k1 import privtopub, ecdsa_raw_recover, N as secp256k1n
->
from py_ecc.secp256k1 import privtopub, ecdsa_raw_recover
Open pyethereum/ethereum/tests/test_state.py and add one line (configure_logging(':trace')):
checker = new_statetest_utils.verify_state_test
place_to_check = 'GeneralStateTests'

->
checker = new_statetest_utils.verify_state_test
place_to_check = 'GeneralStateTests'
configure_logging(':trace')

Step 3. Workaround to run only one test file

Go to the pyethereum/fixtures directory and make a copy of GeneralStateTests.
cd fixtures
cp -a GeneralStateTests GeneralStateTestsCopy

In the GeneralStateTests directory, put only the test case that you want to run.
cd GeneralStateTests
rm -rf st*
cp ../GeneralStateTestsCopy/stTransactionTest/SuicidesAndInternlCallSuicidesSuccess.json ./

Now run the state test in pipenv shell.
pipenv shell
pytest -s ethereum/tests/test_state.py