Easy E2E Testing with Cypress.io

Javier Villanueva

Magento User Group (MUG) Waalwijk

About me...

Javier Villanueva

@jahvi

http://jahvi.com

javier@medialounge.co.uk

Testing can be hard...

E2E

UNIT

INTEGRATION

Increasing scope

More confidence

Faster

Better isolation

What is Cypress.io?

Fast, easy and reliable testing for anything that runs in a browser

Time Travel

Easy to Debug

Real time reloads

Automatic waiting

Best Features

CLI

beforeEach(() => {
    cy.viewport(1440, 900);
    cy.visit('https://magento.test/');
});

context('Checkout', () => {
    it('can purchase product from homepage', () => {
        cy.get('.block-products-list').scrollIntoView();
        cy.get('.block-products-list').contains('Add to Cart').click();

        cy.get('.message-success')
            .invoke('text')
            .should('match', /You added (.*) to your shopping cart/);

        //...

        cy.get('input[name="firstname"]').type('Test');
        cy.get('input[name="lastname"]').type('Test');
        cy.get('select[name="region_id"]').select('Florida');
        cy.get('.action.checkout').click();

        //...

        cy.get('.page-title').should('contain', 'Thank you for your purchase');
    });
});

context('Quick buy', () => {
    it('can add product to cart from category page', () => {
        cy.server();
        cy.route('POST', '**/checkout/cart/add/**').as('addToCart');
        cy.wait('@addToCart');

        // Run assertions
    });
});

Best Practices

Focus on strong tests

Repeatable

Independent

Use data-* attributes as selectors

<button id="main" class="btn btn-large" data-testid="submitBtn">Submit</button>
cy.get('button').click();
cy.get('.btn.btn-large').click();
cy.get('#main').click();
cy.contains('Submit').click();
cy.get('[data-testid="submitBtn"]').click();

Consider conditonal testing

beforeEach(() => {
    cy.setCookie('theme', 'a');
});

context('Button', () => {
    it('can be clicked', () => {
        cy.get('[data-testid="buttonA"]').click();
    });
});
beforeEach(() => {
    cy.setCookie('theme', 'b');
});

context('Button', () => {
    it('can be clicked', () => {
        cy.get('[data-testid="buttonB"]').click();
    });
});

Variant A

Variant B

Reuse tests liberally

context('Login', () => {
    it('can login to backend', () => {
        cy.visit('https://magento.test/admin');

        cy.get('#username').type('admin');
        cy.get('#login').type('123123a{enter}');

        cy.get('.page-title').should('contain', 'Dashboard');
    });
});
context('Product', () => {
    it('can show products in the product grid', () => {
        cy.visit('https://magento.test/admin');

        cy.get('#username').type('admin');
        cy.get('#login').type('123123a{enter}');

        cy.server();
        cy.route('GET', '**/admin/mui/index/**/**product_listing**').as(
            'renderProducts'
        );

        cy.get('.item-catalog > a').click();
        cy.get('.item-catalog-products > a').click();

        cy.wait('@renderProducts');

        cy.get('[data-role="grid-wrapper"] .data-row')
            .its('length')
            .should('be.gte', 1);
    });
});
Cypress.Commands.add('login', (username, password) => {
    cy.visit('https://magento.test/admin');

    cy.get('#username').type(username);
    cy.get('#login').type(password);
});

Commands

context('Product', () => {
    beforeEach(() => {
        cy.login('admin', '123123a{enter}');
    });

    it('can show products in the product grid', () => {
        cy.server();
        cy.route('GET', '**/admin/mui/index/**/**product_listing**').as(
            'renderProducts'
        );

        cy.get('.item-catalog-products > a').click({ force: true });

        cy.wait('@renderProducts');

        cy.get('[data-role="grid-wrapper"] .data-row')
            .its('length')
            .should('be.gte', 1);
    });
});

Not everything needs testing

Additional Features

  • Parallelisation
  • CI / CD Integration
  • Screenshot / Video Recordings
  • Dashboard Service
  • Install Browser Extensions

Limitations

  • Limited <iframe> support
  • Can't run multiple tabs at the same time
  • Can't interact directly with some browser UI elements¬†
  • Browser support *

Alternatives

TL;DR

Focus on real tests, tools like Cypress will help make this easier.

Thank you!

E2E Testing with Cypress.io

By Javier Villanueva

E2E Testing with Cypress.io

Presentation for Magento User Group (MUG) Waalwijk

  • 618
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