Add tests for plotconfig in ws mode

tests/rpc/test_rpc_apiserver.py

@@ -1417,7 +1417,7 @@ def test_api_pair_history(botclient, ohlcv_history):
                                   "No data for UNITTEST/BTC, 5m in 20200111-20200112 found.")
 
 
-def test_api_plot_config(botclient):
+def test_api_plot_config(botclient, mocker):
     ftbot, client = botclient
 
     rc = client_get(client, f"{BASE_URI}/plot_config")
@@ -1441,6 +1441,21 @@ def test_api_plot_config(botclient):
     assert isinstance(rc.json()['main_plot'], dict)
     assert isinstance(rc.json()['subplots'], dict)
 
+    rc = client_get(client, f"{BASE_URI}/plot_config?strategy=freqai_test_classifier")
+    assert_response(rc)
+    res = rc.json()
+    assert 'target_roi' in res['subplots']
+    assert 'do_predict' in res['subplots']
+
+    rc = client_get(client, f"{BASE_URI}/plot_config?strategy=HyperoptableStrategy")
+    assert_response(rc)
+    assert rc.json()['subplots'] == {}
+
+    mocker.patch('freqtrade.rpc.api_server.api_v1.get_rpc_optional', return_value=None)
+
+    rc = client_get(client, f"{BASE_URI}/plot_config")
+    assert_response(rc)
+
 
 def test_api_strategies(botclient, tmpdir):
     ftbot, client = botclient

tests/strategy/strats/hyperoptable_strategy.py

@@ -34,6 +34,11 @@ class HyperoptableStrategy(StrategyTestV3):
     protection_enabled = BooleanParameter(default=True)
     protection_cooldown_lookback = IntParameter([0, 50], default=30)
 
+    # Invalid plot config ...
+    plot_config = {
+        "main_plot": {},
+    }
+
     @property
     def protections(self):
         prot = []