A lot :)

test/system/links_test.rb

@@ -1,37 +1,39 @@
-require 'application_system_test_case'
+# frozen_string_literal: true
+
+require "application_system_test_case"
 
 class LinksTest < ApplicationSystemTestCase
   setup do
     @link = links(:one)
   end
 
-  test 'visiting the index' do
+  test "visiting the index" do
     visit links_url
-    assert_selector 'h1', text: 'Links'
+    assert_selector "h1", text: "Links"
   end
 
-  test 'should create link' do
+  test "should create link" do
     visit links_url
-    click_on 'Link hinzufügen'
+    click_on "Link hinzufügen"
 
-    select @link.link_category.name, from: 'Kategorie'
-    fill_in 'Linktext', with: @link.text
-    fill_in 'Link', with: @link.url
-    click_on 'Link erstellen'
+    select @link.link_category.name, from: "Kategorie"
+    fill_in "Linktext", with: @link.text
+    fill_in "Link", with: @link.url
+    click_on "Link erstellen"
   end
 
-  test 'should update Link' do
+  test "should update Link" do
     visit link_url(@link)
-    click_on 'Link bearbeiten', match: :first
+    click_on "Link bearbeiten", match: :first
 
-    select @link.link_category.name, from: 'Kategorie'
-    fill_in 'Linktext', with: @link.text
-    fill_in 'Link', with: @link.url
-    click_on 'Link aktualisieren'
+    select @link.link_category.name, from: "Kategorie"
+    fill_in "Linktext", with: @link.text
+    fill_in "Link", with: @link.url
+    click_on "Link aktualisieren"
   end
 
-  test 'should destroy Link' do
+  test "should destroy Link" do
     visit link_url(@link)
-    click_on 'Link löschen', match: :first
+    click_on "Link löschen", match: :first
   end
 end