How to use Chai Assertions in Postman In Software Testing
Chai is a JavaScript assertion library and it is used for creating expressive and flexible assertions in test scripts. It provides a wide range of assertion styles and methods to make our test assertions more readable and comprehensible.
We can use Chai assertions to create a chain, Example we want to verify that in our json response is there a property name “location” and if yes then is it an “India”, for this I can create a chain like
pm.expect(pm.response.json()).to.have.property(“location”).that.is.a(“India”);
Similarly, there are functions like “property” such as lengthOf(), include(), a() and many more let’s look at some of them with advanced assertions.
Assertions in Postman and How to Use that in Scripting Window
Assertions are checks or validations we can include in our API requests to ensure that the response from the server meets certain criteria. These criteria could be based on the response’s status code, headers, body content, or any other aspect of the response. Postman provides a variety of built-in assertion options that we can use to validate the responses you receive during API testing. These assertions help us to confirm that our APIs are behaving as expected.
Assertions are mainly the tests that we want to execute after writing of code. In this case, when our APIs are ready, we just want to make sure that they are perfectly working or not. For this Postman provides us a Test section where we can write a test for the request. Postman test uses Chai Assertion Library BDD syntax.