--- title: Testing ASP.NET Core Web API: WebApplicationFactory and... description: A comprehensive guide to integration testing ASP.NET Core Web API endpoints using WebApplicationFactory. Covers setting up the in-memory test server,... canonical: https://daily.dev/posts/testing-asp-net-core-web-api-webapplicationfactory-and-integration-tests-8chotq6j5 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Testing ASP.NET Core Web API: WebApplicationFactory and Integration Tests | daily.dev og:description: A comprehensive guide to integration testing ASP.NET Core Web API endpoints using WebApplicationFactory. Covers setting up the in-memory test server,... og:url: https://daily.dev/posts/testing-asp-net-core-web-api-webapplicationfactory-and-integration-tests-8chotq6j5 og:image: https://api.daily.dev/og/posts/8CHotq6j5.png og:image:alt: Testing ASP.NET Core Web API: WebApplicationFactory and Integration Tests og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Testing ASP.NET Core Web API: WebApplicationFactory and Integration Tests **[We Are .NET](https://daily.dev/sources/wearedotnet)** · 18 min read · 1 upvotes · 0 comments ## Summary A comprehensive guide to integration testing ASP.NET Core Web API endpoints using WebApplicationFactory. Covers setting up the in-memory test server, customizing it to replace production databases with SQLite in-memory via EF Core, swapping external services with fakes, testing authenticated endpoints using a custom AuthenticationHandler, seeding test data with IAsyncLifetime, and organizing tests with xUnit's IClassFixture and ICollectionFixture. Also addresses unit testing controllers, testing middleware and filters, and xUnit best practices like descriptive naming and Theory/InlineData usage. Targets .NET 10 and ASP.NET Core 10. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [More Realistic Tests with In-Memory Databases ASP.NET Core](https://daily.dev/posts/more-realistic-tests-with-in-memory-databases-asp-net-core-wctbbhdk6) · Telerik · 0 upvotes · 0 comments --- Tags: [#testing](https://daily.dev/tags/testing), [#.net](https://daily.dev/tags/.net), [#c#](https://daily.dev/tags/c#), [#aspnetcore](https://daily.dev/tags/aspnetcore) [View this post on daily.dev](https://daily.dev/posts/testing-asp-net-core-web-api-webapplicationfactory-and-integration-tests-8chotq6j5) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Testing ASP.NET Core Web API: WebApplicationFactory and Integration Tests","url":"https://daily.dev/posts/testing-asp-net-core-web-api-webapplicationfactory-and-integration-tests-8chotq6j5","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/testing-asp-net-core-web-api-webapplicationfactory-and-integration-tests-8chotq6j5"},"datePublished":"2026-06-08T22:50:40.962Z","dateModified":"2026-06-08T22:51:07.704Z","description":"A comprehensive guide to integration testing ASP.NET Core Web API endpoints using WebApplicationFactory. 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