Testing101
AutoFixture
| Testing101 | AutoFixture | |
|---|---|---|
| 5 | 11 | |
| 7 | 3,226 | |
| - | 0.4% | |
| 1.7 | 4.6 | |
| 11 months ago | 18 days ago | |
| C# | C# | |
| - | MIT License |
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Testing101
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Don't duplicate logic in Asserts: The most common mistake on unit testing
Let's write some tests for Stringie, a (fictional) library to manipulate strings with a fluent interface. Stringie has a Remove() method to remove substrings from the end of a string.
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How to create custom assertions in C# with MSTest
With this new assertion method, we can refactor one of our tests for Stringie, a (fictional) library to manipulate strings. We used Stringie to learn 4 common mistakes when writing tests and 4 test naming conventions.
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Unit Test Best Practices: On Assertions
For example, let's bring back one test for Stringie, a (fictional) library to manipulate strings, to show the AAA pattern. Notice how each test has these 3 parts. For the sake of the example, we have put comments in each part. You don't need to do that on your own tests.
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4 naming conventions to better name your tests
If you want to practice naming unit tests, check my Unit Testing 101 repository.
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4 common mistakes when writing your first unit tests
If you want to practice identifying and fixing these mistakes, check my Unit Testing 101 repository. You will find the tests that Stringie developers wrote and some other misatkes mistakes they made. Your mission, Jim, should you choose to accept it, is to fix them.
AutoFixture
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API: Go, .NET, Rust
Yes, it does feel like some of the "standard stuff" in other more nuanced languages are missing (especially miss AutoFixture ngl). Some of those are a conscious decison by the golang team for example.
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Integration Testing Postgres Store
Our first test is very easy, I like to name my tests as MethodName_GivenCondition_ShouldExpectedResult to follow the pattern, I have added GetById_GivenRecordDoesNotExist_ShouldReturnNull and I am going to leavarage excellent AutoFixture to get a new Guid as parameter. For this test we don't need arrange part, we would skip to the act and then assert. For Assertion I am going to use FluentAssertions. For this test we need to assert the returned result is null.
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Setting up a simple testing project with C#
The next test to talk about, is that if this was a bank, we would have multiple customers, who can hold multiple accounts that we need to calculate the interest for. You could manually construct these objects if you want, but I'm going to use a package called AutoFixture to make life easier.
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AutoFixture Tips and Tricks
AutoFixture is an amazing library that simplifies the process of creating test data in .NET. If for some reason you don't use this fantastic tool, it's time to consider it. Today, I'm going to share some tips for using AutoFixture that will be beneficial for developers of all skill levels. Let's get started!
- Integration tests without API dependencies with ASP.NET Core and WireMock.Net
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I need a C# crash course for experienced developers
AutoFixture
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Reduce your tests cognitive complexity with AutoFixture
Ensuring that your test is still readable and not bloated by the setup of those variables may be quite a challenge but hopefully no more with AutoFixture, let's see how!
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Practical complex data for unit testing
One neat library for creating and generating test data is AutoFixture. The creators describe it as follows:
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14 .NET packages I always recommend
First time I heard of Bogus, looks interesting, been using AutoFixture for those will definitely take a look at it.
- LPT: There is a library called Bogus, you should know it exists much earlier than I did in my career.
What are some alternatives?
Fluent Assertions - 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. Targets .NET Framework 4.7, as well as .NET Core 2.1, .NET Core 3.0, .NET 6, .NET Standard 2.0 and 2.1. Supports the unit test frameworks MSTest2, NUnit3, XUnit2, MSpec, and NSpec3.
Bogus - :card_index: A simple fake data generator for C#, F#, and VB.NET. Based on and ported from the famed faker.js.
NSubstitute - A friendly substitute for .NET mocking libraries.
FakeItEasy - The easy mocking library for .NET
Moq - Repo for managing Moq 4.x [Moved to: https://github.com/moq/moq]
NBuilder - Rapid generation of test objects in .NET
FsCheck - Random Testing for .NET
MSTest - MSTest framework and adapter
SpecFlow - #1 .NET BDD Framework. SpecFlow automates your testing & works with your existing code. Find Bugs before they happen. Behavior Driven Development helps developers, testers, and business representatives to get a better understanding of their collaboration
AutoMoq - Auto mocking provider for Moq.
GenFu - GenFu is a library you can use to generate realistic test data. It is composed of several property fillers that can populate commonly named properties through reflection using an internal database of values or randomly created data. You can override any of the fillers, give GenFu hints on how to fill them.