TypeScript 2.x By Example

Describe function

First up is the describe function, which acts as the container for our test case. The signature of a describe function is shown in the following screenshot:

As we can see, the describe function takes two parameters. The first one is the description, which is just a string and defines our test case, and the second is the callback function that will be executed. In our case, we have declared a couple of objects that we will use in our test case.

We are able to see the definition of the describe function because we have installed the typings file for Jasmine.