Add spec for dashboards controller
user
```ruby
describe DashboardsController do
  render_views
  
  describe "Student dashboard" do
    let(:course2) { FactoryGirl.create(:given_course)}
    
    before :all do
      @student = FactoryGirl.create(:student_registered_for_course).student
      @group = FactoryGirl.create(:lab_group, given_course: @student.given_courses.first)
      @lab = FactoryGirl.create(:lab, given_course: @student.given_courses.first)
      @group.add_student(@student)
      @lab.add_group!(@group)
    end
    
    before :each do 
      login_as(@student)
      visit dashboard_path(role: "student")
    end
    
    it "shows a particular course" do
      page.should have_content(@lab.given_course.course.course_codes.first.code)
    end
    
    it "shows two courses" do
      course2.register_student(@student)
      page.should have_content(@lab.given_course.course.course_codes.first.code)
      page.should have_content(course2.course.course_codes.first.code)
    end
    
    it "shows a lab" do
      page.should have_content(@lab.name)
    end
  end
  
  describe "Assistant" do
  end
end```
assistant