added tests

spec/helpers/exercise_helper_spec.rb

@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+describe ExerciseHelper do
+  describe '#embedding_parameters' do
+    let(:exercise) { FactoryGirl.build(:dummy) }
+
+    it 'contains the locale' do
+      expect(embedding_parameters(exercise)).to start_with("locale=#{I18n.locale}")
+    end
+
+    it 'contains the token' do
+      expect(embedding_parameters(exercise)).to end_with("token=#{exercise.token}")
+    end
+  end
+end