add destroy learning object test

spec/acceptance/learning_objects_spec.rb

@@ -167,6 +167,22 @@ resource 'Learning Objects' do
     end
   end
 
+  
+  delete '/v1/learning_objects/:id' do
+    include_context "authenticate_user"
+
+    let(:id) { @learning_object.id }
+
+    before do
+      @learning_object = create(:learning_object, publisher: @user)
+    end
+
+    example 'Destroying a learning object' do
+      do_request
+      expect(status).to eq(200)
+    end
+  end
+
 
 
 end