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csharp-tunit

Guide C# test writing and review with TUnit data sources, lifecycle hooks, and parallelism.

1|Updated Mar 10, 2026
Search Tags:#testing#csharp#lifecycle#unit-testing#data-sources#tunit#async-assertions
One-click install
npx skills add https://github.com/woutervanranst/Arius7 --skill csharp-tunit-woutervanranst
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: csharp-tunit
Source: https://github.com/woutervanranst/Arius7/tree/main/.agents/skills/csharp-tunit
Command: npx skills add https://github.com/woutervanranst/Arius7 --skill csharp-tunit-woutervanranst

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Writing and reviewing C# tests in TUnit-heavy projects can be challenging due to data source selection, lifecycle management, and complex parallelism. This skill provides guidance on best practices, patterns, and considerations to write robust tests with TUnit.

Core Features & Use Cases

  • Guidance on choosing appropriate data sources (MethodDataSource, ClassDataSource, Shared fixtures) for deterministic tests.
  • Advice on lifecycle hooks (Before, After, IAsyncInitializer, IAsyncDisposable) to manage test fixtures and resources.
  • Recommendations for parallelism controls and avoiding common pitfalls when tests run concurrently.
  • Patterns for asynchronous assertions and diagnostics to improve reliability and observability in test results.
  • Real-world use cases and example scenarios from C# test suites using TUnit.

Quick Start

Apply TUnit best practices in your C# tests by following the patterns described here to structure data sources, fixtures, and asynchronous assertions.

Frequently Asked Questions about csharp-tunit

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I choose the right data source in TUnit for deterministic C# tests?▼

TUnit data source selection depends on test scope: use MethodDataSource for method-level inputs, ClassDataSource for class-scoped fixtures, and Shared fixtures for cross-test reuse to ensure deterministic C# test execution.

How do I manage test fixture lifecycles using TUnit hooks?▼

TUnit lifecycle hooks manage test fixtures through Before and After attributes, IAsyncInitializer for async setup, and IAsyncDisposable for resource cleanup, ensuring proper fixture initialization and teardown in C# test suites.

How do I control parallelism and avoid concurrency pitfalls in TUnit test execution?▼

TUnit parallel test execution requires understanding parallelization semantics to avoid common pitfalls; controls allow you to manage concurrency levels and ensure safe, deterministic test design when tests run concurrently in .NET projects.

What are the best patterns for async assertions in TUnit to improve test reliability?▼

Async assertions in TUnit improve reliability and observability by using patterns that handle asynchronous operations safely, ensuring test results are accurate and diagnostics are clear when validating asynchronous C# code.

Do I need to know IAsyncInitializer to use TUnit for C# unit testing?▼

Familiarity with TUnit constructs such as IAsyncInitializer, TestDataSource, and parallel test execution semantics is required to enforce safe, deterministic test design with minimal coupling in .NET projects adopting TUnit.

When should I not use shared fixtures in TUnit test suites?▼

Avoid shared fixtures in TUnit when tests require strict isolation or when concurrent execution could introduce coupling; instead, use MethodDataSource or ClassDataSource to maintain deterministic test design and minimize interdependencies.

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