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csharp-xunit

Guide XUnit test structure and deterministic C# test cases.

Updated Mar 23, 2026
Search Tags:#csharp#unit testing#test fixtures#xunit#assertions#data-driven tests#test project
One-click install
npx skills add https://github.com/rodoHasArrived/Meridian-main --skill csharp-xunit-rodohasarrived
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: csharp-xunit
Source: https://github.com/rodoHasArrived/Meridian-main/tree/main/.claude/plugins/csharp-dotnet-development/skills/csharp-xunit
Command: npx skills add https://github.com/rodoHasArrived/Meridian-main --skill csharp-xunit-rodohasarrived

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps you avoid brittle or unclear unit tests by applying proven XUnit patterns for structuring test projects, writing assertions, and enabling repeatable data-driven coverage.

Core Features & Use Cases

  • Clean test project setup: Use a separate [ProjectName].Tests project with appropriate test packages.
  • Proper test structure: Apply AAA (Arrange-Act-Assert) with focused, independent tests.
  • Robust data-driven testing: Use [Theory] with data source attributes for scenarios that vary by input.
  • Maintainable shared context: Use constructor setup, IDisposable teardown, and fixtures (IClassFixture, ICollectionFixture) when shared state is needed.
  • Actionable diagnostics and categorization: Add [Trait] tags and use ITestOutputHelper for troubleshooting.

Quick Start

Ask me to generate an XUnit test plan and example code for your service, using [Fact] for single-case behavior and [Theory] with data attributes for edge cases, following AAA and consistent assertions.

Frequently Asked Questions about csharp-xunit

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

FAQPage Schema
How do I write data-driven xUnit tests in C#?▼

Shared test context in xUnit uses constructor setup for per-test initialization and `IDisposable` for teardown. For broader state sharing across test classes, apply `IClassFixture` or `ICollectionFixture` to ensure dependencies initialize only once.

How should I structure a C# xUnit test project?▼

Categorize and troubleshoot xUnit tests by applying `[Trait]` tags to filter test runs by category. Inject `ITestOutputHelper` into test classes to output diagnostic messages directly to the test runner during execution.

When should I use xUnit fixtures instead of constructor setup?▼

Use xUnit constructor setup for per-test initialization and `IDisposable` teardown for individual cleanup. Switch to `IClassFixture` or `ICollectionFixture` when sharing expensive state setup across multiple test classes or collections.

What is the best way to test exceptions in xUnit?▼

Exception testing in xUnit uses proper assertion methods designed for expected throws within the Act phase of AAA organization. This ensures deterministic test cases that validate specific failure conditions without relying on brittle try-catch blocks.

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