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MassTransit–Tests started to timeout after upgrading to MassTransit 5

On one of my projects, we are using a rather older version of MassTransit(version 3.5). As we needed some of the new features, we thought it was time for an upgrade.

Afbeeldingsresultaat voor masstransit

After updating all our NuGet packages, everything seemed to compile. Unfortunately when we tried to run our unit tests, every test that was using the built-in TestFramework timed out.

Here is the code we were using:

Problem is that the following line keeps waiting for an incoming message:

var orderMessage = await _observer.PostConsumed;

This code worked perfectly before in MassTransit 3.5 but not anymore in MassTransit 5.0.

So what’s changed to cause this behavior?

Starting from MassTransit 4, the in-memory message fabric used by the InMemoryTestFixture behaves the same as RabbitMQ. Previously, every message was published to every endpoint, regardless of whether or not there was a binding for that message type. Now, if there is no binding, the message isn't delivered.

To fix it, we’ll have to add at least one consumer that listens to the specified message type. Here is the altered code:

We override the ConfigureInMemoryReceiveEndpoint method and register a no-op Consumer.

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