add unittest for setting module

Author: wj-Mcat

tests/plugin_test.py

@@ -11,6 +11,7 @@ def test_setting():
         plugin = WechatyPlugin()
 
         plugin.setting['unk'] = 11
+        plugin.setting['count'] += 20
 
         # load the setting file
         assert os.path.exists(plugin.setting_file)
@@ -19,3 +20,5 @@ def test_setting():
             data = json.load(f)
 
         assert data['unk'] == 11
+        assert data['count'] == 20
+

tests/utils_test.py

@@ -56,4 +56,7 @@ def change_value(key: str, _: int, data: HookDict):
     assert data['1'] == 11
 
     data['1'] = 20
-    assert data['1'] == 30
+    assert data['1'] == 30
+
+    data['2'] += 10
+    assert data['2'] == 20