labhub.py: Add error message when nick is empty

All of the backends do not have `nick` attribute.
Hence an error will be shown whenever nick is empty.

Closes coala#632

plugins/labhub.py

@@ -13,6 +13,12 @@
 from utils.mixin import DefaultConfigMixin
 
 
+def validate_nick(msg):
+    if msg.frm.nick:
+        return True
+    return False
+
+
 class LabHub(DefaultConfigMixin, BotPlugin):
     """GitHub and GitLab utilities"""  # Ignore QuotesBear
 
@@ -122,6 +128,8 @@ def invite_cmd(self, msg, match):
         """
         invitee = match.group(1)
         inviter = msg.frm.nick
+        if not validate_nick(msg):
+            yield 'ERROR: The above command cannot be operated without nick.'
 
         team = 'newcomers' if match.group(2) is None else match.group(2)
         team = team.lower()
@@ -196,6 +204,8 @@ def callback_message(self, msg):
     def create_issue_cmd(self, msg, match):
         """Create issues on GitHub and GitLab repositories."""  # Ignore QuotesBear, LineLengthBear, PyCodeStyleBear
         user = msg.frm.nick
+        if not validate_nick(msg):
+            yield 'ERROR: The above command cannot be operated without nick.'
         repo_name = match.group(1)
         iss_title = match.group(2)
         iss_description = match.group(3) if match.group(3) is not None else ''
@@ -234,6 +244,8 @@ def unassign_cmd(self, msg, match):
         issue_number = match.group(4)
 
         user = msg.frm.nick
+        if not validate_nick(msg):
+            yield 'ERROR: The above command cannot be operated without nick.'
 
         try:
             assert org == self.GH_ORG_NAME or org == self.GL_ORG_NAME
@@ -317,6 +329,8 @@ def assign_cmd(self, msg, match):
         iss_number = match.group(4)
 
         user = msg.frm.nick
+        if not validate_nick(msg):
+            yield 'ERROR: The above command cannot be operated without nick.'
 
         try:
             assert org == self.GH_ORG_NAME or org == self.GL_ORG_NAME

tests/labhub_test.py

@@ -12,6 +12,7 @@
 
 import plugins.labhub
 from plugins.labhub import LabHub
+from plugins.labhub import validate_nick
 
 from tests.labhub_test_case import LabHubTestCase
 
@@ -59,6 +60,9 @@ def test_invite_cmd(self):
 
         mock_dict['is_room_member'].return_value = True
 
+        mock_nick = create_autospec(Message)
+        mock_nick.frm.nick.return_value = True
+
         # invite by maintainer
         mock_team_newcomers.is_member.return_value = True
         mock_team_developers.is_member.return_value = True
@@ -117,6 +121,12 @@ def test_is_room_member(self):
         msg.frm.room.occupants = ['batman', 'superman']
         self.assertTrue(LabHub.is_room_member('batman', msg))
 
+    def test_validate_nick(self):
+        msg = create_autospec(Message)
+        msg.frm.nick = PropertyMock()
+        msg.frm.nick = 'batman'
+        self.assertTrue(validate_nick(msg))
+
     def test_hello_world_callback(self):
         self.mock_team.is_member.return_value = False
         testbot = self
@@ -142,6 +152,9 @@ def test_create_issue_cmd(self):
         self.mock_team.is_member.return_value = True
         testbot_public = self
 
+        mock_nick = create_autospec(Message)
+        mock_nick.frm.nick.return_value = True
+
         testbot_public.assertCommand(
             textwrap.dedent('''\
                 !new issue repository this is the title
@@ -205,6 +218,8 @@ def test_unassign_cmd(self):
         mock_iss.unassign = MagicMock()
         self.mock_team.is_member.return_value = True
         testbot = self
+        mock_nick = create_autospec(Message)
+        mock_nick.frm.nick.return_value = True
 
         testbot.assertCommand(
             '!unassign https://github.com/coala/example/issues/999',
@@ -241,6 +256,8 @@ def test_assign_cmd(self):
         mock_maint_team = create_autospec(github3.orgs.Team)
         mock_dev_team.is_member.return_value = False
         mock_maint_team.is_member.return_value = False
+        mock_nick = create_autospec(Message)
+        mock_nick.frm.nick.return_value = True
 
         self.teams['coala developers'] = mock_dev_team
         self.teams['coala maintainers'] = mock_maint_team