specs: add spec for switch_lang action

Author: markets

spec/controllers/application_controller_spec.rb

@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+RSpec.describe ApplicationController do
+  describe '#switch_lang' do
+    before do
+      request.env["HTTP_REFERER"] = root_path
+    end
+
+    it 'switches locale to passed language via params' do
+      original_locale = I18n.locale
+      new_locale      = :ca
+
+      expect do
+        get :switch_lang, locale: new_locale
+      end.to change(I18n, :locale).from(original_locale).to(new_locale)
+    end
+  end
+end