before(:all) do
    @admin = User.create!(nickname: 'test_admin', uid: 'asdf', account_type: :admin)
    @user = User.create!(nickname: 'test_student', uid: 'zxcv', account_type: :student)
    @teacher = User.create!(nickname: 'test_teacher', uid: 'zxcv', account_type: :teacher)