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csharp-xunit

Guide XUnit unit testing in C# with patterns for facts, theories, and fixtures.

Updated Nov 5, 2025
Search Tags:#csharp#dotnet#mocking#unit-testing#xunit#theory#fact
One-click install
npx skills add https://github.com/mkazimoto/AppMAUICopilot --skill csharp-xunit-mkazimoto
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: csharp-xunit
Source: https://github.com/mkazimoto/AppMAUICopilot/tree/main/.github/skills/csharp-xunit
Command: npx skills add https://github.com/mkazimoto/AppMAUICopilot --skill csharp-xunit-mkazimoto

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

XUnit patterns and best practices help teams write robust, readable, and maintainable unit tests in C# projects; this guide consolidates recommended approaches for standard and data-driven testing.

Core Features & Use Cases

  • Use [Fact] for simple tests that verify a single behavior.
  • Use [Theory] with data sources ([InlineData], [MemberData], etc.) to cover multiple inputs and edge cases.
  • Apply the Arrange-Act-Assert (AAA) pattern and leverage fixtures like IClassFixture and ICollectionFixture for shared context.
  • Follow naming conventions like MethodName_Scenario_ExpectedBehavior to improve test readability and traceability.
  • Use mocking frameworks (e.g., Moq) to isolate dependencies and test interactions.

Quick Start

Create a sample test project using xUnit, then write a simple [Fact]-based test and a [Theory]-driven test to validate a Calculator class.

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 unit tests in C# using xUnit?▼

Use [Fact] for single-behavior verification and [Theory] with [InlineData] or [MemberData] for data-driven xUnit testing across standard and edge-case inputs.

What is the difference between [Fact] and [Theory] in xUnit?▼

In xUnit, [Fact] defines a single test case verifying one behavior, while [Theory] enables data-driven testing by executing the same test logic against multiple data sources like [InlineData].

How do I share test context and fixtures across xUnit test classes?▼

Share test setup context in xUnit using IClassFixture for single-class dependencies and ICollectionFixture for sharing state across multiple test collections.

What is the best way to isolate dependencies when unit testing C# code?▼

Isolate C# dependencies in xUnit tests by using mocking frameworks like Moq to substitute interfaces and verify interaction behavior without executing real implementations.

How do I structure xUnit tests using the Arrange-Act-Assert pattern?▼

Structure xUnit tests using the Arrange-Act-Assert pattern by setting up prerequisites, executing the method, and asserting the expected behavior with clear MethodName_Scenario_ExpectedBehavior naming.

When should I use [MemberData] instead of [InlineData] for xUnit theories?▼

Use [InlineData] for simple compile-time constants in xUnit theories, and switch to [MemberData] when supplying complex object instances or dynamically generated test data from properties.

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