csharp-tunit

Overview

C# TUnit is a skill that provides best practices for writing effective unit tests using the TUnit testing framework for .NET 8.0+. It covers test structure without requiring class-level attributes, the fluent await Assert.That() assertion syntax, advanced lifecycle hooks at test/class/assembly/session levels, and rich data-driven testing with [Arguments], [MethodData], and [ClassData] attributes.

Key Features

• Modern Test Structure - Uses [Test] attribute without requiring class-level fixtures, with lifecycle hooks via [Before(Test)], [After(Test)], [Before(Class)], [After(Class)], and session-level hooks
• Fluent Async Assertions - Leverages TUnit's unique await Assert.That() syntax with fluent constraint methods for expressive, readable test assertions
• Rich Data-Driven Testing - Supports [Arguments] for inline data, [MethodData] for method-based sources, [ClassData] for class-based sources, and custom ITestDataSource implementations
• Dependency Management - Provides [DependsOn] attribute for declaring test execution order when needed, while maintaining test independence as the default
• AAA Pattern Enforcement - Follows Arrange-Act-Assert pattern with MethodName_Scenario_ExpectedBehavior naming convention and separate [ProjectName].Tests projects

Who is this for?

This skill is for C# developers using .NET 8.0+ who want to adopt TUnit as their testing framework. It is particularly useful for developers coming from xUnit or NUnit who want to learn TUnit's unique features like async assertions, session-level hooks, and its attribute-based data-driven testing approach.