I was recently writing some tests that had a mocked method that I wanted to return the same value several times in a row from. It turns out, NSubstitute can do this out of the box. While Returns takes a value T, if you look at its method signature, you’ll see it takes another argument …
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If you’ve ever made a test in xUnit with something like 8+ InlineDatas and thought that there has to be a better way… Well, there is! The Xunit.Combinatorial package by Andrew Arnott allows you to specify values in multiple CombinatorialValues attributes, then will run a separate test for each possible combination of those values. It’s …
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Here is the video, slides and Github repository for my talk for JetBrains .NET Day Online ’23. Video Github repository https://github.com/danielwarddev/DotNetDays2023Bookstore Slides
There is a Moq counterpart to this post: Using Moq to verify that an object or list was passed to a method. Click there if you would like to see how to do this using Moq. Overview Sometimes, when using Arg.Is(), we would like the argument to look like a certain object, or worse, a list …
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There is a Moq counterpart to this post: How to mock HttpClient in C# using Moq. Click there if you would like to see how to do this using Moq. This post will cover 3 different ways to mock HttpClient using NSubstitute and give pros and cons for each: Create a fake HttpMessageHandler class Set …
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This is part 2 in a 2-part series: Part 1: How to use IAsyncEnumerable in C# for paged APIs. Part 2: How to test and mock IAsyncEnumerable in C# Note that this post, like the last one, will use the use case of making HTTP calls, but the same logic in it will hold true …
This is part 1 in a 2-part series: Part 1: How to use IAsyncEnumerable in C# for paged APIs Part 2: How to test and mock IAsyncEnumerable in C# Ever since C# 8, we’ve been able to create asynchronous enumerables using IAsyncEnumerable. This is a handy feature to have when the work being done to …
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This post will cover two things: How to use an enum in ASP.NET Core routes with the string value of the enum rather than the integer value How to have the Swagger UI show a dropdown of the enum values rather than needing to type in the string value Thanks to Nick Heath and Thomas …
There is an NSubstitute counterpart to this post: How to easily match on object or list arguments with NSubstitute. Click there if you would like to see how to do this using NSubstitute. I recently had a use case where I wanted to use Moq’s It.Is to check if a model with certain properties was being …
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I recently had a use case where I had added custom properties to the LogContext with Serilog, and I wanted to be able to test if those properties were being added as expected. As it turns out, this is actually quite easy, thanks to a library called TestCorrelator by Mitch Bodmer over at https://github.com/MitchBodmer/serilog-sinks-testcorrelator (which …
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