add publish learning object test

spec/acceptance/learning_objects_spec.rb

@@ -152,4 +152,21 @@ resource 'Learning Objects' do
      end
    end
 
+  post '/v1/learning_objects/:id/publish' do
+    include_context "authenticate_user"
+
+    let(:id) { @learning_object.id }
+
+    before do
+      @learning_object = create(:learning_object, publisher: @user, state: LearningObject.states[:draft])
+    end
+
+    example 'Publishing a learning object' do
+      do_request
+      expect(status).to eq(200)
+    end
+  end
+
+
+
 end