# Testing an ASP.NET Core web app with Testcontainers


<!-- Source: https://github.com/testcontainers/tc-guide-testing-aspnet-core -->

In this guide, you'll learn how to:

- Use Testcontainers for .NET to spin up a Microsoft SQL Server container for integration tests
- Replace SQLite with a production-like database provider in ASP.NET Core tests
- Customize `WebApplicationFactory` to configure test dependencies with Testcontainers
- Manage container lifecycle with xUnit's `IAsyncLifetime`

## Prerequisites

- .NET 8.0+ SDK
- A code editor or IDE (Visual Studio, VS Code, Rider)
- A Docker environment supported by Testcontainers. For details, see the
  [Testcontainers .NET system requirements](https://dotnet.testcontainers.org/supported_docker_environment/).

> [!NOTE]
> If you're new to Testcontainers, visit the
> [Testcontainers overview](https://testcontainers.com/getting-started/) to learn more about
> Testcontainers and the benefits of using it.