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You can find all recipes related to the unit tests in the official docs.
Let’s say you want to unit test math functions from the application’s code, you can do so with Cypress:
/// <reference types="cypress" />
import math from '../../math'
describe('Unit Test Application Code', function () {
const { add, divide, multiply, subtract } = math
before(() => {
// check if the import worked correctly
expect(add, 'add').to.be.a('function')
})
context('math.js', function () {
it('can add numbers', function () {
expect(add(1, 2)).to.eq(3)
})
it('can subtract numbers', function () {
expect(subtract(5, 12)).to.eq(-7)
})
it('can divide numbers', function () {
expect(divide(27, 9)).to.eq(3)
})
it('can muliple numbers', function () {
expect(multiply(5, 4)).to.eq(20)
})
})
})
Source:stackexchange.com