Where can I find documentation on Uint Tests in NestJS?

Question

Node.js

Good afternoon.
I use NestJS and started trying to write Unit tests.
For example:

describe('sendSmsRegister', () => {
        let usersService = UsersService;
        it('Возврат: чётырехзначный код', async () => {
            expect(
                typeof await usersService.sendSmsRegister()
            ).toEqual('string')
        })
    })

Here's where to get all the expect, toEqual documentation for all these things that are checked?
Thank you.

Answer 1

In your imports, all packages are indicated there, and if you hover over the cursor, you will see what belongs to what.
jest