Minor refractoring in labhub tests

[nvzard]

Do minor changes in labhub_tests as asked here #572 (review) (see below)

difficulty/low

[ssg2526]

i am a beginner, can i help?

[nvzard]

@ssg2526 , have you completed your newcomer issue?

[ssg2526]

@nvzard, i was not assigned any issues till now. which issue i should work on?

[nvzard]

@ssg2526 you should get yourself assigned to a difficulty/newcomer issue which you understand. I set the difficulty of this issue as low but gitmate-bot missed it maybe :3
I think this issue would be a little tricky for a newcomer, but if you understand this you can get yourself assigned otherwise look for another newcomer issue :)

[ssg2526]

@nvzard, Thanks for the help.

[jayvdb]

Specifically

self.assertEqual(self.labhub.TEAMS, self.teams)

This should use assertIs instead of assertEqual

in test_invite_cmd

mock_dict['is_room_member'].return_value = True

it is already True, and this should be removed

[jayvdb]

@ssg2526 , you have been sent an invite to join @coala . Please accept it so we can assign this issue to you.

[ssg2526]

@jayvdb, I have joined the coala

[ssg2526]

@jayvdb please assign this issue to me

[jayvdb]

Assigned. sorry we tend to respond better on gitter

[sudonitin]

@Makman2 @li-boxuan Please assign me this issue.