A lot :)

test/system/checks_test.rb

@@ -1,4 +1,6 @@
-require 'application_system_test_case'
+# frozen_string_literal: true
+
+require "application_system_test_case"
 
 class ChecksTest < ApplicationSystemTestCase
   setup do
@@ -6,39 +8,39 @@ class ChecksTest < ApplicationSystemTestCase
     @deletable_check = checks(:deletable)
   end
 
-  test 'visiting the index' do
+  test "visiting the index" do
     visit checks_url
-    assert_selector 'h1', text: 'Checks'
+    assert_selector "h1", text: "Checks"
   end
 
-  test 'should create check' do
+  test "should create check" do
     visit checks_url
-    click_on 'Check hinzufügen'
+    click_on "Check hinzufügen"
 
-    select 'AAA', from: 'Stufe'
-    fill_in 'Name', with: @check.name
-    fill_in 'Position', with: @check.position
-    fill_in_rich_text_area 'Erfolgskriterium', with: @check.success_criterion_html
-    click_on 'Check erstellen'
+    select "AAA", from: "Stufe"
+    fill_in "Name", with: @check.name
+    fill_in "Position", with: @check.position
+    fill_in_rich_text_area "Erfolgskriterium", with: @check.success_criterion_html
+    click_on "Check erstellen"
   end
 
-  test 'should update Check' do
+  test "should update Check" do
     visit check_url(@check)
-    click_on 'Check bearbeiten', match: :first
+    click_on "Check bearbeiten", match: :first
 
-    select 'AAA', from: 'Stufe'
-    fill_in 'Name', with: @check.name
-    fill_in 'Position', with: @check.position
-    fill_in_rich_text_area 'Erfolgskriterium', with: @check.success_criterion_html
-    click_on 'Check aktualisieren'
+    select "AAA", from: "Stufe"
+    fill_in "Name", with: @check.name
+    fill_in "Position", with: @check.position
+    fill_in_rich_text_area "Erfolgskriterium", with: @check.success_criterion_html
+    click_on "Check aktualisieren"
   end
 
-  test 'should destroy Check' do
+  test "should destroy Check" do
     visit check_url(@deletable_check)
-    click_on 'Check löschen', match: :first
+    click_on "Check löschen", match: :first
   end
 
-  test 'fail' do
+  test "fail" do
     skip
     assert false
   end