Developing unit tests for Azure functions with HTTP triggers

So far, we have created multiple Azure functions and validated their functionality using different tools. The functions that we have developed here have been straightforward but, in your real-world applications, it may not be that simple as there will likely be many changes to the code that was initially created. It's good practice to write automated unit tests that help test the functionality of our Azure functions. Every time you run these automated unit tests, you can test all the various paths within the code.

In this recipe, we'll learn how to use the basic HTTP trigger and see how easy it is to write automated unit test cases for this using Visual Studio Test Explorer and Moq (an open-source framework available as a NuGet package).

Getting ready

We'll be using the Moq mocking framework and xunit to develop automated unit test cases for our Azure function. Having a basic working knowledge of Moq...