test: rubocop, try refactor logout

spec/factories/courses.rb

@@ -2,7 +2,7 @@
 FactoryBot.define do
   factory :course do
     transient do
-      prefix { "Course " }
+      prefix { 'Course ' }
     end
     sequence(:title) do |n|
       timestamp = Time.zone.now.to_i.to_s

spec/factories/instance_users.rb

@@ -8,11 +8,11 @@
     role { :normal }
 
     after(:build) do |instance_user, evaluator|
-      if evaluator.user_name
-        instance_user.user ||= build(:user, name: evaluator.user_name, instance_users: [instance_user])
-      else
-        instance_user.user ||= build(:user, instance_users: [instance_user])
-      end
+      instance_user.user ||= if evaluator.user_name 
+                               build(:user, name: evaluator.user_name, instance_users: [instance_user])
+                             else
+                               instance_user.user ||= build(:user, instance_users: [instance_user])
+                             end
     end
 
     trait :instructor do

spec/features/system/admin/instance/user_management_spec.rb

@@ -8,7 +8,7 @@
     let(:instance_admin) { create(:instance_user, role: :administrator).user }
     let!(:prefix) { "admtest-#{rand(36**12).to_s(36)}-usr-" }
     let!(:instance_users) do
-      (1..2).collect do |i|
+      (1..2).map do |i|
         create(:instance_user, user_name: "#{prefix}#{i}")
       end
     end

spec/support/authentication_performers.rb

@@ -16,16 +16,15 @@ def login_as(user, _ = {})
     fill_in 'Password', with: password_for(user)
     click_button 'Sign In'
 
-    # We expect all pages should have a user menu button.
+    # We expect all authenticated pages should have a user menu button.
     expect(page).to have_css('div[data-testid="user-menu-button"]')
   end
 
   def logout(*_)
     find('div[data-testid="user-menu-button"]').click
     find('li', text: 'Sign out').click
-    click_button 'Logout'
-
-    wait_for_page
+    click_button('Logout', wait: 10)
+    expect(page).to_not have_css('div[data-testid="user-menu-button"]')
   end
 
   private