LGTM, there's actually a specific return code for pytest when there were no tests collected: https://docs.pytest.org/en/stable/reference/exit-codes.html But I'm not sure if we return this code from the fill command so this should be ok.

I just checked and we do actually return the same return code as pytest, then we could do:

uv run fill $MODIFIED_DELETED_FILES --clean --until=$FILL_UNTIL --evm-bin evmone-t8n --block-gas-limit $BLOCK_GAS_LIMIT -m "state_test or blockchain_test" --output $BASE_TEST_PATH > >(tee -a filloutput.log) 2> >(tee -a filloutput.log >&2)
FILL_RETURN_CODE=$?
if [ $FILL_RETURN_CODE -eq 5 ]; then
    echo "any_modified_fixtures=false" >> "$GITHUB_OUTPUT"
    exit 0
elif [ $FILL_RETURN_CODE -ne 0 ]; then
    echo "Error: failed to generate .py tests from before the PR."
    exit $FILL_RETURN_CODE
fi

LGTM, there's actually a specific return code for pytest when there were no tests collected: https://docs.pytest.org/en/stable/reference/exit-codes.html But I'm not sure if we return this code from the fill command so this should be ok.

I just checked and we do actually return the same return code as pytest, then we could do:

uv run fill $MODIFIED_DELETED_FILES --clean --until=$FILL_UNTIL --evm-bin evmone-t8n --block-gas-limit $BLOCK_GAS_LIMIT -m "state_test or blockchain_test" --output $BASE_TEST_PATH > >(tee -a filloutput.log) 2> >(tee -a filloutput.log >&2)
FILL_RETURN_CODE=$?
if [ $FILL_RETURN_CODE -eq 5 ]; then
    echo "any_modified_fixtures=false" >> "$GITHUB_OUTPUT"
    exit 0
elif [ $FILL_RETURN_CODE -ne 0 ]; then
    echo "Error: failed to generate .py tests from before the PR."
    exit $FILL_RETURN_CODE
fi

Thanks! Updated with this. Removed the Prague bump as it requires us to update the evmone docker image.