Test a vyper contract with pyethereum.

test_contract_pyethereum.py

from ethereum.tools import tester
from vyper import compiler


def test_merkle_proof_contract():
    tester.languages['vyper'] = compiler.Compiler()
    s = tester.Chain()  # initialize test chain

    contract_code = open('merkleproof.v.py').read()  # get source code
    contract = s.contract(contract_code, language='vyper')  # compile code
    # Note: use args=[] to pass constructor args.

    contract.add_root_hash(b'test')

    assert contract.get_timestamp(b't') == 0