A lot :)

test/system/checklists_test.rb

@@ -1,35 +1,37 @@
-require 'application_system_test_case'
+# frozen_string_literal: true
+
+require "application_system_test_case"
 
 class ChecklistsTest < ApplicationSystemTestCase
   setup do
     @checklist = checklists(:one)
   end
 
-  test 'visiting the index' do
+  test "visiting the index" do
     visit checklists_url
-    assert_selector 'h1', text: 'Checklisten'
+    assert_selector "h1", text: "Checklisten"
   end
 
-  test 'should create checklist' do
+  test "should create checklist" do
     visit checklists_url
-    click_on 'Checkliste hinzufügen'
+    click_on "Checkliste hinzufügen"
 
-    fill_in_rich_text_area 'Details', with: @checklist.description_html
-    fill_in 'Überschrift', with: @checklist.name
-    click_on 'Checkliste erstellen'
+    fill_in_rich_text_area "Details", with: @checklist.description_html
+    fill_in "Überschrift", with: @checklist.name
+    click_on "Checkliste erstellen"
   end
 
-  test 'should update Checkliste' do
+  test "should update Checkliste" do
     visit checklist_url(@checklist)
-    click_on 'Checkliste bearbeiten', match: :first
+    click_on "Checkliste bearbeiten", match: :first
 
-    fill_in_rich_text_area 'Details', with: @checklist.description_html
-    fill_in 'Überschrift', with: @checklist.name
-    click_on 'Checkliste aktualisieren'
+    fill_in_rich_text_area "Details", with: @checklist.description_html
+    fill_in "Überschrift", with: @checklist.name
+    click_on "Checkliste aktualisieren"
   end
 
-  test 'should destroy Checkliste' do
+  test "should destroy Checkliste" do
     visit checklist_url(@checklist)
-    click_on 'Checkliste löschen', match: :first
+    click_on "Checkliste löschen", match: :first
   end
 end