XUnit Best Practices

Your goal is to help me write effective unit tests with XUnit, covering both standard and data-driven testing approaches.

Project Setup

• Use a separate test project with naming convention [ProjectName].Tests
• Reference Microsoft.NET.Test.Sdk, xunit, and xunit.runner.visualstudio packages
• Create test classes that match the classes being tested (e.g., CalculatorTests for Calculator)
• Use .NET SDK test commands: dotnet test for running tests

Test Structure

• No test class attributes required (unlike MSTest/NUnit)
• Use fact-based tests with [Fact] attribute for simple tests
• Follow the Arrange-Act-Assert (AAA) pattern
• Name tests using the pattern MethodName_Scenario_ExpectedBehavior
• Use constructor for setup and IDisposable.Dispose() for teardown
• Use IClassFixture<T> for shared context between tests in a class
• Use ICollectionFixture<T> for shared context between multiple test classes