Add missing WeChat group test cases

tests/fixtures/groups_get.json

@@ -0,0 +1,29 @@
+{
+    "groups": [
+        {
+            "id": 0, 
+            "name": "未分组", 
+            "count": 72596
+        }, 
+        {
+            "id": 1, 
+            "name": "黑名单", 
+            "count": 36
+        }, 
+        {
+            "id": 2, 
+            "name": "星标组", 
+            "count": 8
+        }, 
+        {
+            "id": 104, 
+            "name": "华东媒", 
+            "count": 4
+        }, 
+        {
+            "id": 106, 
+            "name": "★不测试组★", 
+            "count": 1
+        }
+    ]
+}

tests/fixtures/groups_getid.json

@@ -0,0 +1,3 @@
+{
+    "groupid": 102
+}

tests/fixtures/groups_members_update.json

@@ -0,0 +1,4 @@
+{
+    "errcode": 0,
+    "errmsg": "ok"
+}

tests/fixtures/groups_update.json

@@ -0,0 +1,4 @@
+{
+    "errcode": 0,
+    "errmsg": "ok"
+}

tests/test_client.py

@@ -62,6 +62,26 @@ def test_create_group(self):
             self.assertEqual(1, group['group']['id'])
             self.assertEqual('test', group['group']['name'])
 
+    def test_group_get(self):
+        with HTTMock(wechat_api_mock):
+            groups = self.client.group.get()
+            self.assertEqual(5, len(groups))
+
+    def test_group_getid(self):
+        with HTTMock(wechat_api_mock):
+            group = self.client.group.get('123456')
+            self.assertEqual(102, group)
+
+    def test_group_update(self):
+        with HTTMock(wechat_api_mock):
+            result = self.client.group.update(102, 'test')
+            self.assertEqual(0, result['errcode'])
+
+    def test_group_move_user(self):
+        with HTTMock(wechat_api_mock):
+            result = self.client.group.move_user('test', 102)
+            self.assertEqual(0, result['errcode'])
+
     def test_send_text_message(self):
         with HTTMock(wechat_api_mock):
             result = self.client.message.send_text(1, 'test')

wechatpy/client/api/group.py

@@ -25,20 +25,22 @@ def create(self, name):
 
     def get(self, user_id=None):
         """
-        查询所有分组或查询用户所在分组
+        查询所有分组或查询用户所在分组 ID
         详情请参考
         http://mp.weixin.qq.com/wiki/13/be5272dc4930300ba561d927aead2569.html
 
         :param user_id: 用户 ID，提供时查询该用户所在分组，否则查询所有分组
-        :return: 返回的 JSON 数据包
+        :return: 所有分组列表或用户所在分组 ID
         """
         if user_id is None:
-            return self._get('groups/get')
+            res = self._get('groups/get')
+            return res['groups']
         else:
-            return self._post(
+            res = self._post(
                 'groups/getid',
                 data={'openid': user_id}
             )
+            return res['groupid']
 
     def update(self, group_id, name):
         """