test: Add test for behavior

tests/test/plugin/test_conftest.py

@@ -0,0 +1,26 @@
+#!/usr/bin/python3
+
+
+def test_load_contract_type(plugintester):
+    plugintester.makeconftest(
+        """
+import pytest
+from brownie import BrownieTester
+
+@pytest.fixture(params=[BrownieTester, BrownieTester])
+def brownie_tester(request):
+    yield request.param"""
+    )
+
+    plugintester.makepyfile(
+        """
+def test_call_and_transact(brownie_tester, accounts, web3, fn_isolation):
+    c = accounts[0].deploy(brownie_tester, True)
+    c.setNum(12, {'from': accounts[0]})
+    assert web3.eth.blockNumber == 2
+    c.getTuple(accounts[0])
+    assert web3.eth.blockNumber == 2"""
+    )
+
+    result = plugintester.runpytest("-n 2")
+    result.assert_outcomes(passed=2)