How to test behavior of message mutators

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1

Hi there,
I’m trying to test the behavior of my incoming and outgoing message mutator implementations. The testing library provides mocks/fakes for basically all type of contexts, but I’m not sure why there isn’t one for the MutateOutgoingTransportMessageContext. I would have expected a TestableMutateOutgoingTransportMessageContext. What am I missing? Is there an alternative way of testing those?

Thanks,
Serge

2

Hi Serge,

For testing outgoing mutators we use TestableOutgoingPhysicalMessageContext, here is an example of how to do it.

Regards,
Tamara.

3

Hi Tamara,

thanks for your response. It looks like this works for Behaviors, is there anything similar for Message Mutators inheriting from IMutateOutgoingTransportMessages?

This is essentially what I’m trying to do:

var mutator= new AddCurrentPrincipalToOutgoingHeadersMutator(_userPrincipalAccessor.Object);
            await mutator.MutateOutgoing(<what_to_put_here>);

But I can’t find a testable context for this scenario.

Serge

4

Hi Serge,

Tamara and I worked on a solution that may work well for you.

I added an example with a custom TestableOutgoingMessageMutatorContext factory that can easily create the context you requested. The sample also shows you how to use it in a test.

You can find it on GitHub.

We also created an issue in GitHub asking for a more permanent solution.

Please let us know if you have any other questions.

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5

Hi Adam

thanks for your response and thanks for filing the issue with Particular. I gave it a go and it works as intended.

We’ll see if they pick it up in the future and include in their testing library.

Thanks again,
Serge

1 Like