Beginning of a test suite added

requirements-dev.txt

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+pytest
+pytest-asyncio

tests/conftest.py

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+import asyncio
+
+import pytest
+
+import ib_insync as ibi
+
+
+@pytest.fixture(scope='session')
+def event_loop():
+    loop = asyncio.get_event_loop()
+    yield loop
+    loop.close()
+
+
+@pytest.fixture(scope='session')
+async def ib():
+    ib = ibi.IB()
+    await ib.connectAsync()
+    yield ib
+    ib.disconnect()

tests/test_requests.py

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+import pytest
+
+import ib_insync as ibi
+
+
+@pytest.mark.asyncio
+async def test_request_error_raised(ib):
+    contract = ibi.Stock('MMM', 'SMART', 'USD')
+    order = ibi.MarketOrder('BUY', 100)
+    orderState = await ib.whatIfOrderAsync(contract, order)
+    assert orderState.commission > 0
+
+    ib.RaiseRequestErrors = True
+    badContract = ibi.Stock('XXX')
+    with pytest.raises(ibi.RequestError) as exc_info:
+        await ib.whatIfOrderAsync(badContract, order)
+    assert exc_info.value.code == 321