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POHow to verify multiple actions in NServiceBus Handler
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  1. POHow to verify multiple actions in NServiceBus Handler
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    copied!<p>I have a handler that needs to send a local message on every instance of an entity retrieved from a repository. The callback passed to <code>NServiceBus.Testing.Handler&lt;&gt;::ExpectSendLocal()</code> only gets invoked on the first invocation of <code>IBus::SendLocal()</code> in my handler. I've tried chaining a second <code>Handler&lt;&gt;::ExpectSendLocal()</code> but its callback is only invoked on the first one too. Here's an example handler:</p> <pre><code>public FooHandler : IHandleMessages&lt;IFoo&gt; { public void Handle(IFoo message) { var bars = new [] {new Bar {Zap = "Zap1"}, new Bar {Zap = "Zap2"}}; foreach (var bar in bars) { this.Bus().SendLocal&lt;IBarProcessed&gt;(barMsg =&gt; { barMsg.Zap = bar.Zap; }); bar.IsProcessed = true; } } } </code></pre> <p>Here's an example unit test that increments a count for <code>IBus::SendLocal()</code> expectations:</p> <pre><code>public void When_IFoo_message_received() { int actualCount = 0; new NServiceBus.Testing.Handler&lt;FooHandler&gt;() .ExpectSendLocal&lt;IBarProcessed&gt;(completed =&gt; actualCount++) .OnMessage&lt;IFoo&gt;(); Assert.AreEqual(2, actualCount); // fails because actualCount is one } </code></pre> <p>Here's an example unit test that chains <code>NServiceBus.Testing.Handler&lt;FooHandler&gt;.ExpectSendLocal()</code> and checks for 2 different values from 2 messages:</p> <pre><code>public void When_IFoo_message_received() { new NServiceBus.Testing.Handler&lt;FooHandler&gt;() .ExpectSendLocal&lt;IBarProcessed&gt;(completed =&gt; { Assert.AreEqual("Zap1", completed.Zap); }) .ExpectSendLocal&lt;IBarProcessed&gt;(completed =&gt; { Assert.AreEqual("Zap2", completed.Zap); // fails because it's the value from the first one e.g. "Zap1" }) .OnMessage&lt;IFoo&gt;(); } </code></pre>
 

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