API-testing-w-Jest: A JavaScript repository from aktasevren

JEST

You can check example on my repo : https://github.com/aktasevren/filminglocations-API-w-ExpressJS

https://engineering.cimri.com/modern-testing-jest-ve-react-testing-library-part1-e9fe517ac845

https://engineering.cimri.com/modern-testing-jest-ve-react-testing-library-part-2-4e687f20f1c0

package.json { "scripts": { "test":"jest" } }
default => ** tests** , .spec.js , .test.js

toBe(booelan, number, string) , toEqual(array, object) , toBeTruthy , toBeFalsy , not.toEqual() , toContain() , toThrow(function) , toMatch , toBeGreaterThan , toBeUndefined , toHaveProperty
jest -t keyword =>
jest --watch working with git
jest --coverage

mock

import axiosMock from "axios";

async function getUsers(){
    try{
        const response = await axiosMock.get("/users");
        return response.data.users;
    } catch(e){
        throw new Error("wrong")
    }
}

jest.mock("axios")

const fakeUsers = ["Evren","Ahmet","Blabla"]

axiosMock.get.mockResolvedValue({ data : {users:fakeUsers}});

test("gets the users" , async() =>{
    const users = await getUsers();
    expect(users).toEqual(fakeUsers)
} )

Not: Async await yapısını kullanmak için test fonksiyonunuzu async yapmanız gerekir.

configuration https://jestjs.io/docs/configuration

aktasevren/API-testing-w-Jest

JEST