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I'm trying to unit test a basic Azure Function. The function's Run method requires a TraceWriter argument; TraceWriter is an abstract class and I'm not finding much in terms of documentation for mocking this dependency.
Here's the signature of the method I'm attempting to test:
public static void Run(string myQueueItem, TraceWriter log)
Any insights regarding mocking TraceWriter and/or Azure Function unit testing strategies would be much appreciated.
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In the Azure portal, you navigate to your Function App and select a function. Click proxies in the chosen function and create a new proxy. Next, you provide a name, route template, allowed HTTP methods, and for example choose to override the response when the function is invoked.
Azure Functions are small pieces of code you can run in the cloud. Even with these little pieces of code, you should create unit tests. Since it is a small piece of code, you need to test creating a unit test, which is not too difficult or time-consuming.
Mocking is a process that allows you to create a mock object that can be used to simulate the behavior of a real object. You can use the mock object to verify that the real object was called with the expected parameters, and to verify that the real object was not called with unexpected parameters.
Introduction. TLTR: Create Azure DevOps git project using azure-pipelines.yml, create build artifact, deploy ADFv2 and SQLDB bacpac, trigger pytest to do unit tests. Unit testing is a software engineering practice that focuses on testing individual parts of code.
Azure Functions now can support consuming an ILogger as per this GitHub thread: https://github.com/Azure/Azure-Functions/issues/293
My suggestion would be that you use the new tooling supported in VS2017 Preview with precompiled functions to allow you to improve your function's testability. You can get started with the new tools for Azure Functions here:
https://blogs.msdn.microsoft.com/appserviceteam/2017/03/16/publishing-a-net-class-library-as-a-function-app/
Donna Malayeri has published an excellent post that explains how to use precompiled Functions with C#: https://blogs.msdn.microsoft.com/appserviceteam/2017/03/16/publishing-a-net-class-library-as-a-function-app/
This will allow you to create a Function that consumes an Interface instead of the concrete object. The answer is a bit long winded but there's a similar thread here with a nice answer:
Azure Function logging using TraceWriter in external library
ILogger
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