Doing a blocking synchronous HTTP call will otherwise freeze the UI. It is a wrapper over the JavaScript XMLHttpRequest API. The Angular HTTP Client provides a simplified API for network communication. Service = TestBed.This tutorial is adapted from Web Age course Comprehensive Angular 10 Programming Training.
npm i -include=dev jasmine-auto-spiesĪnd then, write the test! import
#Angular http client post install
Here's the quickest way to write a unit test for an Angular service that depends on HttpClient.įirst, install jasmine-auto-spies. Write your first unit test for an Angular service So, now that we've decided to mock the HTTP client, how do we test an Angular service that depends on the HttpClient module? Or in other words, write unit tests instead of integration tests when testing your data (API) services.Īlso, when done properly, unit tests are faster to write and give a higher ROI then integration tests which is why I recommend mocking the Angular HTTP client when testing your data services. So instead of making real HTTP calls in your Angular tests, most of the time you should mock the HTTP calls. They break faster and sooner than unit tests. But more times then not, those tests are brittle integration that snap, pop and blow up in your face. Sometimes it's a good idea to call a real API server when writing tests for your HTTP services. it all depends on what you want to accomplish by writing tests for your HTTP service. Or should you actually call a real server? When you write tests for your Angular service, should you mock the HTTP calls to your data service (API server)? Should you mock the Angular HttpClient? Or call a real API service?
#Angular http client post how to
I'm going to show you and Harry how to properly test your Angular HTTP services and help shake those nasty bugs out of your code. Should he use a unit test? Or an integration test?Īnd that, my friend, is what this complete guide to testing Angular HTTP services is for. So, how should Harry test his Angular service? Maybe I should just skip the tests for this Angular service? I think my boss won't find out. How do I mock Angular's HTTP Client without getting an injection error? If I have it call a real API server, then I'll first have to authenticate with it, and how would I do that? Should I mock the HTTP Client or have it call a real API server? So he went to Google to try to figure this out and instead of finding the clarification he needed, his head was soon with questions. Confused, he sat down to figure this out and try to decide how to best test this Angular service that depended on the HttpClient module.įirst he tried to inject the HttpClient module but that threw a weird injection error. He had written a dozen tests when he came to a service that depended on the HttpClient module. "No problem", Harry said, and he went back to his computer and began writing tests. His boss showed up one day and told him that before the new app could hit production he needed to write tests for all the public methods in his services. He always double-checked to make sure that the HttpClient was never injected in any of his components, leaving the API calls for a service that he then injected into his Angular components. He followed all the best practices he read about on the Angular website. Harry began coding and doing the best he knew how. This developer had learned some basic things about the Angular framework and was given the job of building a shinny, new Angular application for his company. Once upon a time there was a young Angular developer named Harry. Whereas your service is responsible for retrieving that data from whatever your source happens to be.īut just how do you test a service that depends on the HttpClient? This leaves the job of displaying or rendering the data to your front-end components. It's considered best practice to put your data logic inside a service that can be shared across the application. Maybe your experience with Angular has been different than mine but I find that the HttpClient is a common dependency in an Angular service.
#Angular http client post code
Want to skip the read and get to the code right away? Then click here.Ī common dependency inside an Angular service file is the HttpClient? 😸 So you can shake the bugs outta your Angular code.
How to test Angular services with the HttpClient.
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