![]() ![]() We include the MockWebServer with the following Maven import: There's already an example on how to use WireMock with JUnit 5 for testing a Spring Boot application on my blog: Spring Boot Integration Tests with WireMock and JUnit 5 ![]() We'll use the lightweight MockWebServer for this demo, but you can achieve the same with WireMock. ![]() The two most common libraries for this are WireMock and the MockWebServer from OkHttp. Going further, we also have to take a small overhead (time-wise) into account. However, we are still testing a unit of our application in isolation. Whether or not we are still writing a unit test depends on your definition and scope. We can then let our HTTP clients connect to this local server and test our code. Instead of heavy lifting with Mockito, we'll spawn a local web server and queue HTTP responses. A better approach for testing HTTP client usages This also allows us to test more niche scenarios like slow responses, different HTTP status codes, etc. behavior on non 200 HTTP responses or how our implementation handles exceptions, there is not much benefit with this approach.Ī better solution for testing our Java HTTP clients would be to actually test them in action and see how they behave to different responses. With this approach, we also almost duplicate our production code as the stubbing setup has to match our usage. We end up in a mocking hell and have to mock the whole setup. In addition, we usually chain multiple method calls or use a builder to construct the instance of the client or the HTTP request.Įven though Mockito is able to mock static method calls and with deep mocking, we could keep the stubbing setup lean, we should always remember:Įvery time a mock returns a mock a fairy dies. Most of the Java HTTP clients are instantiated with static methods. With this article, you'll understand why such an approach is not beneficial and what you should do instead when writing a test that involves a Java HTTP client. When it comes to testing Java classes that use one of these clients, I often see developers trying to mock the internals of the library. Most of the frameworks ship their own HTTP client (e.g Spring with WebClient and RestTemplate, Jakarta EE with the JAX-RS Client), but there are also standalone clients available: OkHttp, Apache HttpClient, Unirest, etc. Fortunately, there are mature Java HTTP client libraries available that are robust and have a user-friendly API. First time here? Get an overview of all topics you'll find answers for on this blog here.įetching data via HTTP from a remote system is a task almost every application has to solve. ![]()
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