csharp-testing
C# and .NET testing patterns with xUnit, FluentAssertions, mocking, integration tests, and test organization best practices. Use when writing or reviewing xUnit tests, mocks, or integration tests in a C# / .NET project.
- Kind
- Skill
- Works with
- Claude Code, Codex
- Languages
- C# / .NET
- Source
- affaan-m/ECC @ d3b8a3e90890
- Path
- skills/csharp-testing/SKILL.md
- License
- MIT
- Jobs
- Testing, Review, Documentation
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# C# Testing Patterns
Comprehensive testing patterns for .NET applications using xUnit, FluentAssertions, and modern testing practices.
## When to Activate
- Writing new tests for C# code
- Reviewing test quality and coverage
- Setting up test infrastructure for .NET projects
- Debugging flaky or slow tests
## Test Framework Stack
| Tool | Purpose |
|---|---|
| **xUnit** | Test framework (preferred for .NET) |
| **FluentAssertions** | Readable assertion syntax |
| **NSubstitute** or **Moq** | Mocking dependencies |
| **Testcontainers** | Real infrastructure in integration tests |
| **WebApplicationFactory** | ASP.NET Core integration tests |
| **Bogus** | Realistic test data generation |
## Unit Test Structure
### Arrange-Act-Assert
```csharp
public sealed class OrderServiceTests
{
private readonly IOrderRepository _repository = Substitute.For<IOrderRepository>();
private readonly ILogger<OrderService> _logger = Substitute.For<ILogger<OrderService>>();
private readonly OrderService _sut;
public OrderServiceTests()
{
_sut = new OrderService(_repository, _logger);
}
[Fact]
…