ASP.NET Core Web API Interview Question #154

What is WebApplicationFactory in ASP.NET Core testing?

Testing, HttpClient, Integration Testing, Background Services & Deployment Senior Advanced

Quick Interview Answer

WebApplicationFactory<TEntryPoint> creates a test server for an ASP.NET Core application and provides HttpClient instances that call the application in memory. It is commonly used for end-to-end integration tests of the HTTP pipeline.

Detailed Explanation

The factory can replace services, configuration, authentication, or database registrations specifically for the test environment.

Code Example

public class ApiTests :
    IClassFixture<WebApplicationFactory<Program>>
{
    private readonly HttpClient _client;

    public ApiTests(WebApplicationFactory<Program> factory)
    {
        _client = factory.CreateClient();
    }
}