Fix BatchTuner test (#981)

* Update naive_trial.py

* Fix test BatchTuner

test/tuner_test.py

@@ -49,6 +49,10 @@ def switch(dispatch_type, dispatch_name):
                 'optimize_mode': 'maximize'
             }
         }
+    if dispatch_name == 'BatchTuner':
+        experiment_config['searchSpacePath'] = 'batchtuner_search_space.json'
+    else:
+        experiment_config['searchSpacePath'] = 'search_space.json'
     dump_yml_content(config_path, experiment_config)
 
 def test_builtin_dispatcher(dispatch_type, dispatch_name):

test/tuner_test/batchtuner_search_space.json

+{
+    "combine_params":
+    {
+        "_type" : "choice",
+        "_value" : [{"x": 1},
+                    {"x": 100}]
+    }
+}