context 'when user is added to assignment team' do
      it 'it throws error when assignmentTeam has maximum number of participants' do
        allow(User).to receive(:find_by).with(name: student1.name).and_return(student1)
        allow(Team).to receive(:find).with('1').and_return(team1)
        allow(AssignmentTeam).to receive(:find).with('1').and_return(team1)