enhance and test pair validation

freqtrade/exchange/__init__.py

@@ -63,7 +63,12 @@ def validate_pairs(pairs: List[str]) -> None:
     :return: None
     """
     markets = _API.get_markets()
+    stake_cur = _CONF['stake_currency']
     for pair in pairs:
+        if not pair.startswith(stake_cur):
+            raise RuntimeError(
+                'Pair {} not compatible with stake_currency: {}'.format(pair, stake_cur)
+            )
         if pair not in markets:
             raise RuntimeError('Pair {} is not available at {}'.format(pair, _API.name.lower()))
 

freqtrade/tests/test_exchange.py

@@ -0,0 +1,34 @@
+# pragma pylint: disable=missing-docstring
+from unittest.mock import MagicMock
+
+import pytest
+
+from freqtrade.exchange import validate_pairs
+
+
+def test_validate_pairs(default_conf, mocker):
+    api_mock = MagicMock()
+    api_mock.get_markets = MagicMock(return_value=['BTC_ETH', 'BTC_TKN', 'BTC_TRST', 'BTC_SWT'])
+    mocker.patch('freqtrade.exchange._API', api_mock)
+    mocker.patch.dict('freqtrade.exchange._CONF', default_conf)
+    validate_pairs(default_conf['exchange']['pair_whitelist'])
+
+
+def test_validate_pairs_not_available(default_conf, mocker):
+    api_mock = MagicMock()
+    api_mock.get_markets = MagicMock(return_value=[])
+    mocker.patch('freqtrade.exchange._API', api_mock)
+    mocker.patch.dict('freqtrade.exchange._CONF', default_conf)
+    with pytest.raises(RuntimeError, match=r'not available'):
+        validate_pairs(default_conf['exchange']['pair_whitelist'])
+
+
+def test_validate_pairs_not_compatible(default_conf, mocker):
+    api_mock = MagicMock()
+    api_mock.get_markets = MagicMock(return_value=['BTC_ETH', 'BTC_TKN', 'BTC_TRST', 'BTC_SWT'])
+    default_conf['stake_currency'] = 'ETH'
+    mocker.patch('freqtrade.exchange._API', api_mock)
+    mocker.patch.dict('freqtrade.exchange._CONF', default_conf)
+    with pytest.raises(RuntimeError, match=r'not compatible'):
+        validate_pairs(default_conf['exchange']['pair_whitelist'])
+

freqtrade/tests/test_telegram.py

@@ -268,7 +268,8 @@ def test_forcesell_handle_invalid(default_conf, update, mocker):
     assert 'no open trade' in msg_mock.call_args_list[0][0][0]
 
 
-def test_performance_handle(default_conf, update, ticker, limit_buy_order, limit_sell_order, mocker):
+def test_performance_handle(
+        default_conf, update, ticker, limit_buy_order, limit_sell_order, mocker):
     mocker.patch.dict('freqtrade.main._CONF', default_conf)
     mocker.patch('freqtrade.main.get_buy_signal', side_effect=lambda _: True)
     msg_mock = MagicMock()