Convert settings/preferences/appearance controller spec to system (#33323)

spec/system/settings/preferences/appearance_spec.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'Settings preferences appearance page' do
+  let(:user) { Fabricate :user }
+
+  before { sign_in user }
+
+  it 'Views and updates user prefs' do
+    visit settings_preferences_appearance_path
+
+    expect(page)
+      .to have_private_cache_control
+
+    select 'contrast', from: theme_selection_field
+    check confirm_reblog_field
+    uncheck confirm_delete_field
+
+    expect { save_changes }
+      .to change { user.reload.settings.theme }.to('contrast')
+      .and change { user.reload.settings['web.reblog_modal'] }.to(true)
+      .and(change { user.reload.settings['web.delete_modal'] }.to(false))
+    expect(page)
+      .to have_title(I18n.t('settings.appearance'))
+  end
+
+  def save_changes
+    within('form') { click_on submit_button }
+  end
+
+  def confirm_delete_field
+    I18n.t('simple_form.labels.defaults.setting_delete_modal')
+  end
+
+  def confirm_reblog_field
+    I18n.t('simple_form.labels.defaults.setting_boost_modal')
+  end
+
+  def theme_selection_field
+    I18n.t('simple_form.labels.defaults.setting_theme')
+  end
+end