![]() Now, you would separately build an API and then also build a UI on top of the API.ĪPIs work behind the scenes and transport only raw data, since there’s no human interface that would require the data to be presented in a visually appealing way. These days, web applications are built in an API + UI fashion, so you don’t need to build a monolithic “web app” as before. This is a way for your app to pull information from a database or website, or give information to an app requestion information. What is API testing?Īn API, or application programming interface, is what your app, program, or service uses to communicate with other apps, programs, or services. This article discusses the importance of API testing and how to use Postman to create easy-to-use, repeatable API tests. Manual API testing can be time-consuming, but fortunately there are tools to automate and ultimately speed up the testing process. Testing before and after release can eliminate these issues that could plague your users. A buggy API would mean your app is unable to communicate correctly with other systems. Pm.Along with user interface testing and feature testing, confirming your app’s API works as it should is integral to the successful launch of your product. Let’s write a bit more complex test, with the help of a snippet!įor this, we first delete our test code and then click on a snippet on the right side of the text area. These code-snippets also exist for Pre-requests Scripts they can be used to dynamically generate parts of our requests, like headers or parameters. Right beside the text area, we can find code-snippets and a link to the scripts’ documentation of Postman. If we export it later, it can be found as a string inside our collection JSON. When we click Save, our test is saved besides our request inside our collection. We can see the result of this test after we clicked Send we just have to scroll down under the text area, we used to enter the test. In this test, we simply check if the response has a 200 status. When we click Send at the top right, the code is executed after Postman has received a response. Let’s add a test script by selecting the Test tab and pasting the following code into the text area: If we select our request, we can see Pre-requests Script and Test tabs below the text field where we entered our target URL. Tests, which are executed after a response has been received.Pre-requests Scripts, which are executed before the request is sent.The next thing we have to do is adding scripts to our requests. This export creates a JSON file we can share it with other developers and put inside version control. We can even export the collection it resides in by clicking on … in the lower right corner of our collection in the left sidebar and selecting Export. Now that we have saved our request, we can load it every time we start Postman and do it again. If we now click Save, our request is updated inside the collection we created before. Postman sends a GET HTTP request to the server, which, in turn, responds with an HTML page. ![]() If we click on the request, we can Enter request URL. It won’t have any target URL, so it can’t be sent at the moment. The new request shows up in the left sidebar under the new collection we created. To create a request, we have to follow these steps: ![]() With a collection to hold our requests, we can now define these requests.
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