In the previous part of this series I talked about how we set up a unit test to run a web application under an embedded instance of the Cassini web server. This takes care of the central component of the diagram below that illustrates our architecture.

So what about mocking the entire backend?
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We came across an interesting problem in SymbolSource recently. In the current architecture, the support for NuGet and OpenWrap is provided though so called gateways, that act as protocol adapters connecting to our SOAP API. In theory this provides a great testing opportunity, because it is easy to mock a set of relatively simple, procedural APIs.

A lot has been written about testing MVC applications: that this paradigm of programming is unit test friendly, because you can test the controller in isolation, or you could even try testing views. But what about configuration? Routing? Handlers? That can only be tested in an environment with a fully running web application. Because of this, I should probably have put integration testing in the post’s title, but since we wanted to focus on fully automating our gateway tests and running them with xUnit in CI, let’s keep the original term.
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