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
 
@@ -33,6 +34,7 @@ def setUp(self):
             'GH_ORG_NAME': 'coala',
             'GL_ORG_NAME': 'coala',
         }
+        self.bot.sender._nick = 'batman'
         self.labhub = self.load_plugin('LabHub', self.global_mocks, configs)
 
     def test_invite_cmd(self):
@@ -117,6 +119,12 @@ 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
@@ -156,7 +164,7 @@ def test_create_issue_cmd(self):
                 textwrap.dedent('''\
                     first line of body
                     second line of body
-                    Opened by @None at [text]()''')
+                    Opened by @batman at [text]()''')
         )
 
         testbot_public.assertCommand(
@@ -171,7 +179,7 @@ def test_create_issue_cmd(self):
                 'another title',
                 textwrap.dedent('''\
                     body
-                    Opened by @None at [text]()''')
+                    Opened by @batman at [text]()''')
         )
 
         testbot_public.assertCommand(
@@ -201,7 +209,7 @@ def test_unassign_cmd(self):
         mock_iss = create_autospec(IGitt.GitHub.GitHubIssue)
         self.mock_repo.get_issue.return_value = mock_iss
         mock_iss.assignees = PropertyMock()
-        mock_iss.assignees = (None, )
+        mock_iss.assignees = ('batman', )
         mock_iss.unassign = MagicMock()
         self.mock_team.is_member.return_value = True
         testbot = self
@@ -211,7 +219,7 @@ def test_unassign_cmd(self):
             'you are unassigned now',
             timeout=10000)
         self.mock_repo.get_issue.assert_called_with(999)
-        mock_iss.unassign.assert_called_once_with(None)
+        mock_iss.unassign.assert_called_once_with('batman')
 
         mock_iss.assignees = ('meetmangukiya', )
         testbot.assertCommand(
@@ -335,7 +343,7 @@ def test_assign_cmd(self):
                               'already assigned to someone')
 
         # has assignee same as user
-        mock_issue.assignees = (None, )
+        mock_issue.assignees = ('batman', )
         testbot.assertCommand(cmd.format('coala', 'a', '23'),
                               'already assigned to you')