Python contract wrappers (#1721)

python-packages/contract_wrappers/test/test_base_contract_wrapper.py

@@ -0,0 +1,47 @@
+"""Tests for :class:`BaseContractWrapper`."""
+
+import pytest
+from eth_utils import to_checksum_address
+
+from zero_ex.contract_artifacts import abi_by_name
+from zero_ex.contract_wrappers._base_contract_wrapper import (
+    BaseContractWrapper,
+)
+
+
+@pytest.fixture(scope="module")
+def contract_wrapper(ganache_provider):
+    """Get a BaseContractWrapper instance for testing."""
+    return BaseContractWrapper(provider=ganache_provider)
+
+
+def test_contract_wrapper__execute_method(
+    accounts,
+    contract_wrapper,  # pylint: disable=redefined-outer-name
+    erc20_proxy_address,
+    weth_address,  # pylint: disable=redefined-outer-name
+):
+    """Test :function:`BaseContractWrapper.execute` method."""
+    acc1_allowance = contract_wrapper.execute_method(
+        address=weth_address,
+        abi=abi_by_name("WETH9"),
+        method="allowance",
+        view_only=True,
+        args=(
+            to_checksum_address(accounts[3]),
+            to_checksum_address(erc20_proxy_address),
+        ),
+    )
+    assert acc1_allowance == 0
+
+    with pytest.raises(Exception):
+        contract_wrapper.execute_method(
+            address=weth_address,
+            abi=abi_by_name("WETH9"),
+            method="send",
+            view_only=True,
+            args=[
+                to_checksum_address(accounts[3]),
+                to_checksum_address(erc20_proxy_address),
+            ],
+        )