public void When_publishing_should_clone_headers() { var publishPipeline = new FakePipeline <IOutgoingPublishContext>(); var context = CreateContext(publishPipeline); var publishOptions = new PublishOptions(); publishOptions.SetHeader("header1", "header1 value"); MessageOperations.Publish <MyMessage>(context, m => { }, publishOptions); publishPipeline.ReceivedContext.Headers.Add("header2", "header2 value"); publishPipeline.ReceivedContext.Headers["header1"] = "updated header1 value"; var optionsHeaders = publishOptions.GetHeaders(); Assert.AreEqual(1, optionsHeaders.Count); Assert.AreEqual("header1 value", optionsHeaders["header1"]); }