added tests

spec/controllers/exercises_controller_spec.rb

@@ -5,6 +5,24 @@ describe ExercisesController do
   let(:user) { FactoryGirl.create(:admin) }
   before(:each) { allow(controller).to receive(:current_user).and_return(user) }
 
+  describe 'POST #clone' do
+    let(:request) { proc { post :clone, id: exercise.id } }
+    before(:each) { request.call }
+
+    expect_assigns(exercise: Exercise)
+
+    it 'clones the exercise' do
+      expect_any_instance_of(Exercise).to receive(:duplicate).with(hash_including(public: false, user: user)).and_call_original
+      expect { request.call }.to change(Exercise, :count).by(1)
+    end
+
+    it 'generates a new token' do
+      expect(Exercise.last.token).not_to eq(exercise.token)
+    end
+
+    expect_redirect
+  end
+
   describe 'POST #create' do
     let(:exercise_attributes) { FactoryGirl.build(:dummy).attributes }