ASP.NET Core Web API Interview Question #153

What is integration testing in ASP.NET Core Web API?

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

Quick Interview Answer

Integration testing verifies multiple application components working together through realistic infrastructure boundaries. In ASP.NET Core, integration tests commonly start the application in a test host and send real HTTP requests through the middleware, routing, authentication, model binding, and endpoint pipeline.

Detailed Explanation

Integration testing verifies multiple application components working together through realistic infrastructure boundaries. In ASP.NET Core, integration tests commonly start the application in a test host and send real HTTP requests through the middleware, routing, authentication, model binding, and endpoint pipeline.

They provide stronger confidence in the complete API contract than isolated controller tests.

Code Example

var response = await client.GetAsync("/api/products/1");

Assert.Equal(HttpStatusCode.OK, response.StatusCode);

var product =
    await response.Content.ReadFromJsonAsync<ProductResponse>();

Assert.Equal(1, product!.Id);