Core: add list/dict merging feature to triggers

test/programs/test_generate.py

@@ -91,3 +91,35 @@ def test_generate_yaml(self):
             user_path.cached_path = user_path_backup
 
         self.assertOutput(self.output_tempdir.name)
+
+    def test_update_weights(self):
+        original_weights = {
+            "scalar_1": 50,
+            "scalar_2": 25,
+            "list_1": ["string"],
+            "dict_1": {"option_a": 50, "option_b": 50},
+            "dict_2": {"option_f": 50},
+            "set_1": {"option_c"}
+        }
+
+        # test that we don't allow +merge syntax on scalar variables
+        with self.assertRaises(BaseException):
+            Generate.update_weights(original_weights, {"+scalar_1": 0}, "Tested", "")
+
+        new_weights = Generate.update_weights(original_weights, {"scalar_2": 0,
+                                                                 "+list_1": ["string_2"],
+                                                                 "+dict_1": {"option_b": 0, "option_c": 50},
+                                                                 "+set_1": {"option_c", "option_d"},
+                                                                 "dict_2": {"option_g": 50},
+                                                                 "+list_2": ["string_3"]},
+                                              "Tested", "")
+
+        self.assertTrue(new_weights["scalar_1"] == 50 and new_weights["scalar_2"] == 0)
+        self.assertTrue("list_2" in new_weights
+                        and len(new_weights["list_2"]) == 1
+                        and new_weights["list_2"] == ["string_3"])
+        self.assertTrue(len(new_weights["list_1"]) == 2 and new_weights["list_1"] == ["string", "string_2"])
+        self.assertTrue(new_weights["dict_1"]["option_b"] == 0 and new_weights["dict_1"]["option_a"] == 50)
+        self.assertTrue("option_c" in new_weights["dict_1"] and new_weights["dict_1"]["option_c"] == 50)
+        self.assertTrue("option_f" not in new_weights["dict_2"] and new_weights["dict_2"]["option_g"] == 50)
+        self.assertTrue(len(new_weights["set_1"]) == 2 and "option_d" in new_weights["set_1"])