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.NET Day 2025: Future-Proof Your Blazor Apps wi...
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.NET Day
August 29, 2025
Technology
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.NET Day 2025: Future-Proof Your Blazor Apps with bUnit
.NET Day
August 29, 2025
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Transcript
Future-proof Your Blazor Apps with bUnit
Who is this guy? • Hans Muns • Software Developer
& Microsoft Certified trainer @ Vitas • Newest hobby: Dog owner
The history of Blazor testing 2006 Selenium Release 2018 Blazor
Release 2020 Playwright Release 2021 bUnit Release
Why do we need a new tool? Relatively slow Not
designed for component/unit testing Mocking is hard Require browser setup
What is bUnit?
What is bUnit? It’s not a replacement for xUnit, NUnit,
TUnit, or any other unit testing framework. It’s an addition.
What is bUnit? Open-source testing library for Blazor components Enables
‘regular’ unit testing experience Supported by the .NET Foundation Doesn’t run in the browser, doesn’t run Javascript
What is bUnit?
How can we hello world this?
How can we hello world this?
How can we hello world this?
How can we hello world this?
Let’s explore a real- world use case
None
Let’s make a plan 1. Third-party components 2. Parameters &
callbacks 3. Dependency injection . 4. Verifying output.
Working with third-party components
Working with third-party components
Working with third-party components
Working with third-party components
Parameters and callbacks
Dependency injection
Semantic comparison
Semantic comparison
Semantic comparison diff:ignore <attribute>:ignore diff:ignoreChildren diff:ignoreAttributes diff:whitespace=“Normalize” diff:ignoreCase <attribute>:ignoreCase diff:regex
Let’s demo
Even more cool features Faking authorization Emulating JSRuntime Faking persistentComponentState
Faking NavigationManager Faking IWebAssemblyHostEnvironment InputFile helper to test uploading files
Let’s compare with Playwright
Comparing the counter test
Comparing the counter test
Comparing the counter test
bUnit FAQ Does bUnit replace testing tools like Selenium/Playwright? Are
there any limitations when using third party components? How can I integrate bUnit in my CI/CD pipelines? How do you go about testing javascript heavy components?
Recap Enables true unit testing Setting up your bUnit project
Semantic comparison An addition to our testsuite Mocking components Compared to other tools
Were to find more https://bunit.dev/ https://github.com/bUnit-dev/bUnit https://learn.microsoft.com/en- us/shows/visual-studio- toolbox/testing-blazor- components-with-bunit
Let’s stay connected