How deeply does ASP.NET Core in Action, 3e cover TestServer?

Explains setup, host startup, client creation, and response assertions, while deferring full-application customization to WebApplicationFactory.

TestServer

As explained in ASP.NET Core in Action, 3e

TestServer is an ASP.NET Core in-memory server that accepts test requests and returns responses without requiring a network server.

TestServer is an in-memory ASP.NET Core server for sending HTTP requests and receiving responses without opening a network listener. It lets middleware and other application components run inside a framework-like request pipeline. section 36.3 section 36.5

A small TestServer integration test follows these steps:

Create a HostBuilder and configure the test application's middleware. section 36.3.1
Call UseTestServer() to replace the default Kestrel server. section 36.3.1
Start the host, obtain an HttpClient with GetTestClient(), and send an in-memory request. section 36.3.1

Testing middleware at /ping

Configure a HostBuilder with StatusMiddleware, enable UseTestServer(), start the host, and call client.GetAsync("/ping"). The middleware receives a request that appears equivalent to a network request, although the request remains entirely in memory.

How ASP.NET Core in Action, 3e covers it

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Related concepts

api calluses · An API call is a programmatic request or invocation through an application programming interface to access data or invoke an operation.
WebApplicationFactoryused by · WebApplicationFactory is an ASP.NET Core testing API that bootstraps an application in an in-memory host and provides clients for functional and integration testing.
Microsoft.AspNetCore.TestHostproduced by · Microsoft.AspNetCore.TestHost is an ASP.NET Core library that hosts applications in memory for integration testing without a separate server.
Kestrelalternative to · Kestrel is the cross-platform HTTP server implementation used by ASP.NET Core to receive and process HTTP traffic.
integration testused by · An integration test evaluates whether multiple software components, or a component and an external dependency, interact and behave correctly together.
UseTestServerconfigured by · UseTestServer is an ASP.NET Core hosting extension method that configures an application to use TestServer instead of a network web server.

This explainer was generated by Manning's knowledge graph from the text of ASP.NET Core in Action, 3e. The section links point to the parts of the book it draws on.