Question 1

How to mock IJSRuntime in bUnit tests?

Accepted Answer

bUnit provides built-in mocking for IJSRuntime using the `Bunit.TestDoubles.JSInterop` namespace. You can set up mock returns for JavaScript calls and verify invocations, making it easy to isolate components from real JS dependencies. Check the documentation for examples on configuring mocks for different scenarios.

Question 2

bUnit vs Selenium for Blazor testing

Accepted Answer

bUnit is for fast unit testing of Blazor components in milliseconds, focusing on C# logic and markup verification, while Selenium is for slower, browser-based end-to-end testing. Use bUnit for component-level tests and Selenium for full UI automation; they complement each other in a testing strategy.

Question 3

Can bUnit test both Blazor Server and Blazor WebAssembly?

Accepted Answer

Yes, bUnit is designed to work with all Blazor hosting models, including Blazor Server and Blazor WebAssembly. It renders components in a test context without requiring a real browser, so tests are consistent across hosting options. Ensure you use the appropriate .NET version as per the compatibility matrix.

Question 4

Does bUnit require xUnit or can I use NUnit?

Accepted Answer

bUnit supports multiple testing frameworks, including xUnit, NUnit, MSTest, and TUnit, as stated in the README. You can choose your preferred framework; the setup is similar, with bUnit integrating seamlessly into existing test projects.

Question 5

How to test event handlers in bUnit?

Accepted Answer

Use bUnit's `Find` or `WaitFor` methods to locate elements and then trigger events like `Click()` or `Input()`. After triggering, you can verify state changes or rendered output. For example, `cut.Find("button").Click()` simulates a click and allows assertions on the component's response.

Question 6

Is bUnit suitable for integration testing?

Accepted Answer

bUnit is primarily for unit testing Blazor components, not full integration tests. It mocks dependencies and runs in isolation, so for testing interactions with real services or databases, you'd need complementary tools like integration test frameworks or API testing libraries.

bUnit - a testing library for Blazor components

What is bUnit - a testing library for Blazor components?

Overview

Use Cases

Best For

Related Projects

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions