Add conftest.py for testsuite.

tests/conftest.py

@@ -0,0 +1,83 @@
+import pytest
+
+from vyper import compiler
+
+from eth_tester import (
+    EthereumTester,
+)
+from web3.providers.eth_tester import (
+    EthereumTesterProvider,
+)
+from web3 import (
+    Web3,
+)
+from vdb.vdb import (
+    set_evm_opcode_debugger,
+    set_evm_opcode_pass,
+    VyperDebugCmd
+)
+from vdb.source_map import (
+    produce_source_map
+)
+
+
+@pytest.fixture(scope="module")
+def tester():
+    t = EthereumTester()
+    return t
+
+
+def zero_gas_price_strategy(web3, transaction_params=None):
+    return 0  # zero gas price makes testing simpler.
+
+
+@pytest.fixture(scope="module")
+def w3(tester):
+    w3 = Web3(EthereumTesterProvider(tester))
+    w3.eth.setGasPriceStrategy(zero_gas_price_strategy)
+    return w3
+
+
+def _get_contract(w3, source_code, *args, **kwargs):
+    abi = compiler.mk_full_signature(source_code)
+    bytecode = '0x' + compiler.compile(source_code).hex()
+    contract = w3.eth.contract(abi=abi, bytecode=bytecode)
+
+    stdin = kwargs['stdin'] if 'stdin' in kwargs else None
+    stdout = kwargs['stdout'] if 'stdout' in kwargs else None
+
+    source_map = produce_source_map(source_code)
+    set_evm_opcode_debugger(source_code=source_code, source_map=source_map, stdin=stdin, stdout=stdout)
+
+    value = kwargs.pop('value', 0)
+    value_in_eth = kwargs.pop('value_in_eth', 0)
+    value = value_in_eth * 10**18 if value_in_eth else value  # Handle deploying with an eth value.
+    gasPrice = kwargs.pop('gasPrice', 0)
+    deploy_transaction = {
+        'from': w3.eth.accounts[0],
+        'data': contract._encode_constructor_data(args, kwargs),
+        'value': value,
+        'gasPrice': gasPrice
+    }
+    tx = w3.eth.sendTransaction(deploy_transaction)
+    address = w3.eth.getTransactionReceipt(tx)['contractAddress']
+    contract = w3.eth.contract(address, abi=abi, bytecode=bytecode)
+    # Filter logs.
+    contract._logfilter = w3.eth.filter({
+        'fromBlock': w3.eth.blockNumber - 1,
+        'address': contract.address
+    })
+    return contract
+
+
+@pytest.fixture
+def get_contract(w3):
+    def get_contract(source_code, *args, **kwargs):
+        return _get_contract(w3, source_code, *args, **kwargs)
+    return get_contract
+
+@pytest.fixture
+def get_last_out():
+    def _get_last_out(stdout):
+        return stdout.getvalue().splitlines()[-2].split(VyperDebugCmd.prompt)[1]
+    return _get_last_out