Add a first async test

.travis.yml

@@ -13,7 +13,7 @@ addons:
 install:
 - ./install_ta-lib.sh
 - export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
-- pip install --upgrade flake8 coveralls pytest-random-order mypy
+- pip install --upgrade flake8 coveralls pytest-random-order pytest-asyncio mypy
 - pip install -r requirements.txt
 - pip install -e .
 jobs:

freqtrade/tests/exchange/test_exchange.py

@@ -27,6 +27,20 @@ def ccxt_exceptionhandlers(mocker, default_conf, api_mock, fun, mock_ccxt_fun, *
     assert api_mock.__dict__[mock_ccxt_fun].call_count == 1
 
 
+async def async_ccxt_exception(mocker, default_conf, api_mock, fun, mock_ccxt_fun, **kwargs):
+    with pytest.raises(TemporaryError):
+        api_mock.__dict__[mock_ccxt_fun] = MagicMock(side_effect=ccxt.NetworkError)
+        exchange = get_patched_exchange(mocker, default_conf, api_mock)
+        await getattr(exchange, fun)(**kwargs)
+    assert api_mock.__dict__[mock_ccxt_fun].call_count == 1
+
+    with pytest.raises(OperationalException):
+        api_mock.__dict__[mock_ccxt_fun] = MagicMock(side_effect=ccxt.BaseError)
+        exchange = get_patched_exchange(mocker, default_conf, api_mock)
+        await getattr(exchange, fun)(**kwargs)
+    assert api_mock.__dict__[mock_ccxt_fun].call_count == 1
+
+
 def test_init(default_conf, mocker, caplog):
     caplog.set_level(logging.INFO)
     get_patched_exchange(mocker, default_conf)
@@ -515,6 +529,45 @@ def test_get_ticker(default_conf, mocker):
     exchange.get_ticker(pair='ETH/BTC', refresh=True)
 
 
+@pytest.mark.asyncio
+async def test_async_get_ticker_history(default_conf, mocker):
+    tick = [
+        [
+            1511686200000,  # unix timestamp ms
+            1,  # open
+            2,  # high
+            3,  # low
+            4,  # close
+            5,  # volume (in quote currency)
+        ]
+    ]
+
+    async def async_fetch_ohlcv(pair, timeframe, since):
+        return tick
+
+    exchange = get_patched_exchange(mocker, default_conf)
+    # Monkey-patch async function
+    exchange._api_async.fetch_ohlcv = async_fetch_ohlcv
+
+    exchange = Exchange(default_conf)
+    pair = 'ETH/BTC'
+    res = await exchange.async_get_ticker_history(pair, "5m")
+    assert type(res) is tuple
+    assert len(res) == 2
+    assert res[0] == pair
+    assert res[1] == tick
+
+    await async_ccxt_exception(mocker, default_conf, MagicMock(),
+                               "async_get_ticker_history", "fetch_ohlcv",
+                               pair='ABCD/BTC', tick_interval=default_conf['ticker_interval'])
+
+    api_mock = MagicMock()
+    with pytest.raises(OperationalException, match=r'Could not fetch ticker data*'):
+        api_mock.fetch_ohlcv = MagicMock(side_effect=ccxt.BaseError)
+        exchange = get_patched_exchange(mocker, default_conf, api_mock)
+        await exchange.async_get_ticker_history(pair, "5m")
+
+
 def make_fetch_ohlcv_mock(data):
     def fetch_ohlcv_mock(pair, timeframe, since):
         if since:

requirements.txt

@@ -15,6 +15,7 @@ TA-Lib==0.4.17
 pytest==3.6.4
 pytest-mock==1.10.0
 pytest-cov==2.5.1
+pytest-asyncio==0.9.0
 tabulate==0.8.2
 coinmarketcap==5.0.3