Add test for hyperoptresolver

freqtrade/tests/optimize/test_hyperopt.py

@@ -9,7 +9,8 @@ import pytest
 from freqtrade.data.converter import parse_ticker_dataframe
 from freqtrade.data.history import load_tickerdata_file
 from freqtrade.optimize.hyperopt import Hyperopt, start
-from freqtrade.resolvers import StrategyResolver
+from freqtrade.optimize.default_hyperopt import DefaultHyperOpts
+from freqtrade.resolvers import StrategyResolver, HyperOptResolver
 from freqtrade.tests.conftest import log_has, patch_exchange
 from freqtrade.tests.optimize.test_backtesting import get_args
 
@@ -38,6 +39,28 @@ def create_trials(mocker, hyperopt) -> None:
     return [{'loss': 1, 'result': 'foo', 'params': {}}]
 
 
+def test_hyperoptresolver(mocker, default_conf, caplog) -> None:
+
+    mocker.patch(
+        'freqtrade.configuration.Configuration._load_config_file',
+        lambda *args, **kwargs: default_conf
+    )
+    hyperopts = DefaultHyperOpts
+    delattr(hyperopts, 'populate_buy_trend')
+    delattr(hyperopts, 'populate_sell_trend')
+    mocker.patch(
+        'freqtrade.resolvers.hyperopt_resolver.HyperOptResolver._load_hyperopt',
+        MagicMock(return_value=hyperopts)
+    )
+    x = HyperOptResolver(default_conf, ).hyperopt
+    assert not hasattr(x, 'populate_buy_trend')
+    assert not hasattr(x, 'populate_sell_trend')
+    assert log_has("Custom Hyperopt does not provide populate_sell_trend. "
+                   "Using populate_sell_trend from DefaultStrategy.", caplog.record_tuples)
+    assert log_has("Custom Hyperopt does not provide populate_buy_trend. "
+                   "Using populate_buy_trend from DefaultStrategy.", caplog.record_tuples)
+
+
 def test_start(mocker, default_conf, caplog) -> None:
     start_mock = MagicMock()
     mocker.patch(