What is the best way to create a test for my Vue component using Jest?

Below is the login form component that needs to be tested for various scenarios:

  1. Verify successful login with both username and password filled
  2. Check for input error when either username or password is left blank
  3. Ensure input error is thrown when only username is entered without a password
  4. Validate input error when only password is entered without a username

<template>
    <main>
    <div class="main-logo">
        <img src="../../assets/login-img/main_logo.svg" alt="Main Logo" />
    </div>
    <div class="main-form">
        <div class="main-from__title">
        <p class="main-from__title-text">Login</p>
        </div>
        <form @submit.prevent="login" class="main-form__login">
        <p class="main-form__login-status">{{ this.loginStatus }}</p>
        <input
            class="main-form__login-input main-form__login-input_name"
            id="login"
            v-model="loginForm.username"
            required
            placeholder="Username"
            type="text"
        />
        <input
            class="main-form__login-input main-form__login-input_password"
            id="password"
            v-model="loginForm.password"
            required
            placeholder="Password"
            type="password"
        />
        <input class="main-form__login-submit" v-if="this.loginBtn" type="submit" @click="handleLogin" value="Login" />

        <input class="main-form__login-submit main-form__login-session" v-if="this.showLogoutEverywhereBtn" type="button" @click="websocketAuth" value="Log out from other windows" />
        </form>
    </div>
    </main>
</template>
<script>
import { mapState } from 'vuex'
import { socketUrl } from '../../config/url'


export default {
    name: 'Login',
    data() {
        return {
            loginForm: {
                username: 'user1',
                password: '123',
            },
        };
    },
    computed: {
        ...mapState({
            loginBtn: state => state.user.loginBtn,
            loginStatus: state => state.user.loginStatus,
            showLogoutEverywhereBtn: state => state.user.showLogoutEverywhereBtn,
        })
    },
    mounted: function () {
        console.log('login showLogoutEverywhereBtn', this.showLogoutEverywhereBtn)
        socketUrl.on('toLogin', () => {
            this.$router.push('/login')
        })
    },
    methods: {
        handleLogin(e) { 
            e.preventDefault() 
            this.$store.dispatch('login', this.loginForm) 
                .then((response) => { 
                    console.log('login page response: ', response)
                    if (response.id_user !== undefined) {
                        this.$router.push({ path: '/' })
                    }
                })
                .catch((e) => { // If error
                    console.log('inside error: ', e);
                });
        },
        websocketAuth(e) {
            e.preventDefault()
            console.log('login:  ', this.loginForm.username, this.loginForm.password)
            this.$store.dispatch("logoutEverywhere", {
                user_login: this.loginForm.username,
                user_password: this.loginForm.password
            })
                .then((resp) => {
                    let data = { userId: resp, page: 'login' }
                    socketUrl.emit('logoutEverywhere', data, (flag) => {
                    if(flag) {
                        this.$store.dispatch('duplicateLoginClear')
                    }
                    console.log(flag)
                    })

                    console.log('1 ', resp)
                })
        }
    },
};

</script>

The current test file contains the following scenarios:

import Vue from 'vue'
import { mount } from '@vue/test-utils'
import Login from '../views/login/index'

// Describe groups together related tests. For example, all tests related to login functionality.
describe('Testing 4 possible login scenarios!', () => {
    test('Verify successful login with both username and password.', () => {
        expect(true).toBe(true)
    });

    test('Check for login error when either username or password is left blank', () => {
        expect(true).toBe(true)
    });

    test('Ensure input error is thrown when only username is entered without a password', () => {
        expect(true).toBe(true)
    });

    test('Validate input error when only password is entered without a username', () => {
        expect(true).toBe(true)
    });
});

Answer №1

Consider giving testing-library a try (while still being able to use jest). They offer a plethora of helpful examples that can be found here.

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