Yep, there are a couple options: 1. The code for this article can be found on Git Hub. Finally the ones that inspect an action and the things that happened around this action. xUnit; NSubstitute; Fluent Assertions; Summary. Write a custom equality assertion method in a separate test-specific class or subclass of the system under test This is an example of an Expected State Verificationtest I wrote: This was a legacy application; I had to mock a web service to make sure arguments I was sending to it didn’t change. Head to NuGet package manager, and hunt down "fluent assertions" (If you don't remember how, it's the same steps as above for NUnit, but simply search online for fluent assertions) Note: You can add it to NUnit as well. Supports the unit test frameworks MSTest2, NUnit3, XUnit2, MSpec, and NSpec3. Written by the original inventor of NUnit v2, xUnit.net is the latest technology for unit testing C#, F#, VB.NET and other .NET languages. Targets .NET Framework 4.5 and 4.7, as well as .NET Core 2.0, .NET Core 3.0, .NET Core 2.1, .NET Standard 1.3, 1.6, 2.0 and 2.1. So, jumping back to async and Tasks — this is sadly one area that is currently lacking in Fluent Assertions. To solve this problem, frameworks to improve readability in assertions were created, like, Fluent Assertions framework for .net. I'm going to be writing a BDD driven app, initially just to run in a browser. In practice, I use fluent assertions and mocking frameworks such as Moq, but that is outside the focus here. Fortunately, in XUnit, the constructor is called once per test, so you can put the setup logic there, and not duplicate it per test. In this post, I’m going to show how Fluent Assertions can improve the unit test readability. With this release, Fluent Assertions is build from a single project that targets.NET Standard 1.4, 1.6 and 2.0, as well as the full.NET 4.5 Framework. Download it via Nuget package manager: Or type this command in Nuget package manager console: Assertions. For using FluentAssertions, I am going to download and install the nuget package in my integration test project. 2. NUnit provides a rich set of assertions as static methods of the Assert class. Currently Fluent Assertions behaves differently than MS Test, XUnit and Nunit. Supports the unit test frameworks MSTest, MSTest2, Gallio, NUnit, XUnit, MBUnit, MSpec, and NSpec. The simple reason is that.NET Standard 1.4 doesn’t support all the features of the.NET Framework. As you can see Fluent Assertions provides far more test helpers than what is built into xUnit (and MSTest / NUnit). In this section we’re going to see some assertions based on their type. Download it via Nuget package manager: Or type this command in Nuget package manager console: Note that other testing libraries have similar ways to run something once per test ... this uses an amazing library called Fluent Assertions. It's extremely simple to pick-up and start using. A very extensive set of extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style unit tests. Most people can get to grips with it within 5-10 minutes and it will … Fluent Assertions is a set of.NET extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style test. It can be used with XUnit for testing. Code reliability: Unit testing with XUnit and FluentAssertions in .NET , 1.3, 1.6 and 2.0. I divided the assertions into three types. What Is Fluent Assertions Fluent Assertions is a Nuget package I've been using consistently on my projects for about 6 years. The assertions have been reviewed manually to match the most expressive fluent assertion equivalents. These three testing frameworks match only on the exact type and not the subclasses, … I was very impressed with Fluent Assertions, as demonstrated in the Pluralsight course "Pragmatic Behavior-driven Design with .NET" by Rob Conery.He used it together with xUnit.net. FluentAssertions library supports many unit test frameworks including NUnit, xUnit, and MSTest. 3. Code sample For example Assert.True(result > 0) has been translated to result.Should().BeGreaterThan(0) instead of (result > 0).Should().BeTrue() in order to get the best possible assertion failure messages. Those that check a type and its reference. xUnit.net is a free, open Fluent Assertions is a library that provides us: Clearer explanations about why a test failed Improve readability of test source code Basically, with this library, we can read a test more like an English sentence. 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