How deeply does .NET in Action, Second Edition cover WebApplicationFactory?

Explains host creation, client-start timing, service replacement, environment selection, and response assertions, but not framework internals.

WebApplicationFactory

As explained in .NET in Action, Second Edition

WebApplicationFactory is an ASP.NET Core testing API that creates an in-memory application host and a client for sending requests to it.

WebApplicationFactory is an ASP.NET Core testing API that creates an in-memory host for a web service and supplies an HttpClient for requests against it. Creating the client starts the service, allowing configuration, dependency injection, controllers, and application logic to be exercised together in one process. section 8.5

A practical integration-test setup typically:

Removes the existing HttpClient registration and adds a client configured with a fake HttpMessageHandler when external HTTP calls must stay in-process. section 8.5

Testing a search endpoint

Configure the fake message handler with comics, create the factory client, and request /search?searchText=b. Assert an OK response, deserialize the content, and verify that only comic number 12 is returned.

How .NET in Action, Second Edition covers it

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Also explained in

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ASP.NET Core in Action, 3eWebApplicationFactory is an ASP.NET Core testing API that bootstraps an application for in-memory functional and integration testing and permits test-specific customization.

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Related concepts

HTTP clientproduces · An HTTP client is software or an API component that sends HTTP requests and receives and processes HTTP responses.
api calluses · An API call is a programmatic request or invocation through an application programming interface to access data or invoke an operation.
TestServeruses · TestServer is an ASP.NET Core in-memory server that accepts test requests and returns responses without requiring a network server.
IClassFixture<TFixture>used by · IClassFixture<TFixture> is an xUnit interface that provides one shared fixture instance to the tests in a class.
integration testused by · An integration test evaluates whether multiple software components, or a component and an external dependency, interact and behave correctly together.
contractuses · An API contract is a specification of the operations, data, and behavioral expectations that govern interactions between software components.

This explainer was generated by Manning's knowledge graph from the text of .NET in Action, Second Edition. The section links point to the parts of the book it draws on.