Outline XUnit best practices for .NET unit tests using Arrange-Act-Assert.
npx skills add https://github.com/afonsoft/VideoChat --skill csharp-xunit-afonsoft
Please help me install this Agent Skill. Skill: csharp-xunit Source: https://github.com/afonsoft/VideoChat/tree/main/.agents/skills/csharp-xunit Command: npx skills add https://github.com/afonsoft/VideoChat --skill csharp-xunit-afonsoft
XUnit testing can be inconsistent and hard to maintain without a clear set of best practices. This Skill provides structured guidance to write clean, reliable unit tests in .NET using XUnit, including standard and data-driven approaches, naming conventions, and test organization.
Create a test project named MyApp.Tests, reference the required NuGet packages, and implement a sample CalculatorTests class using the AAA pattern.
High-intent search queries and answers about installing and using this skill.
Data-driven unit tests in xUnit use the [Theory] attribute combined with [InlineData], [MemberData], or [ClassData] to execute a single test method against multiple data scenarios. This approach covers varied inputs while maintaining consistent test isolation and verification.
The best way to structure xUnit tests is using the Arrange-Act-Assert pattern within a dedicated test project named [ProjectName].Tests. This enforces clear separation of setup, execution, and assertion phases, supported by meaningful test names like MethodName_Scenario_ExpectedBehavior.
Use [Fact] for simple, single-scenario unit tests with no external parameters, and use [Theory] for data-driven testing where the same logic must be verified against multiple inputs. Both enforce consistent isolation and verification steps for reliable .NET test execution.
Yes, xUnit testing works seamlessly with mocking frameworks like Moq to isolate units during .NET testing. By applying a mix of Assert methods and mocking, you can verify interactions and ensure consistent isolation across both standard and data-driven test scenarios.
To set up an xUnit test project, reference Microsoft.NET.Test.Sdk, xunit, and xunit.runner.visualstudio. This configuration provides the testing framework, SDK dependencies, and visual studio test adapter required to execute standard and data-driven .NET tests.
Inconsistent xUnit test naming makes maintenance difficult because intent is unclear. Adopting the MethodName_Scenario_ExpectedBehavior convention improves reliability by ensuring each test's purpose, execution condition, and expected behavior are immediately obvious from its name.
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