Add test to ensure --hyperopt-loss is mandatory

.github/workflows/ci.yml

@@ -154,7 +154,7 @@ jobs:
       run: |
         cp config.json.example config.json
         freqtrade create-userdir --userdir user_data
-        freqtrade hyperopt --datadir tests/testdata -e 5 --strategy SampleStrategy --hyperopt SampleHyperOpt --print-all
+        freqtrade hyperopt --datadir tests/testdata -e 5 --strategy SampleStrategy --hyperopt SampleHyperOpt --hyperopt-loss SharpeHyperOptLossDaily --print-all
 
     - name: Flake8
       run: |

freqtrade/resolvers/hyperopt_resolver.py

@@ -82,8 +82,4 @@ class HyperOptLossResolver(IResolver):
         hyperoptloss.__class__.ticker_interval = str(config['timeframe'])
         hyperoptloss.__class__.timeframe = str(config['timeframe'])
 
-        if not hasattr(hyperoptloss, 'hyperopt_loss_function'):
-            raise OperationalException(
-                f"Found HyperoptLoss class {hyperoptloss_name} does not "
-                "implement `hyperopt_loss_function`.")
         return hyperoptloss

tests/optimize/test_hyperopt.py

@@ -230,6 +230,13 @@ def test_hyperoptresolver_noname(default_conf):
         HyperOptResolver.load_hyperopt(default_conf)
 
 
+def test_hyperoptlossresolver_noname(default_conf):
+    with pytest.raises(OperationalException,
+                       match="No Hyperopt loss set. Please use `--hyperopt-loss` to specify "
+                             "the Hyperopt-Loss class to use."):
+        HyperOptLossResolver.load_hyperoptloss(default_conf)
+
+
 def test_hyperoptlossresolver(mocker, default_conf) -> None:
 
     hl = DefaultHyperOptLoss