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�In the realm of e-commerce automation, Cypress stands out as a robust end-to-end testing framework. A fundamental aspect of crafting effective Cypress tests involves mastering CSS locators and assertions. These components are pivotal for accurately identifying web elements and validating their behaviors within your application.�
Medium

CSS Locators in Cypress

Cypress primarily utilizes CSS selectors to pinpoint elements within the Document Object Model (DOM). A proficient grasp of CSS selectors is essential for interacting with various web elements during testing. Commonly used CSS selectors include:�
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ID Selector (#id): Targets elements by their unique ID attribute.�
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cy.get('#login-button')
Class Selector (.class): Selects elements based on their class attribute.�
BrowserStack
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YouTube
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cy.get('.product-item')
Type Selector (element): Selects all instances of a specific HTML tag.�
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cy.get('button')
Attribute Selector ([attribute=value]): Targets elements with a specific attribute value.�
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cy.get('[data-test=submit]')
Descendant Selector (ancestor descendant): Selects elements that are descendants of a specified ancestor.�
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cy.get('.cart-items li')
Child Selector (parent > child): Selects direct child elements of a specified parent.�
BrowserStack
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cy.get('ul > li')
For a comprehensive exploration of CSS selectors in Cypress, refer to this detailed guide: �
BrowserStack

Assertions in Cypress

Assertions are integral to verifying that your application behaves as intended. Cypress incorporates the Chai assertion library, enabling both BDD (Behavior-Driven Development) and TDD (Test-Driven Development) styles. Key assertion methods include:�
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Cypress Documentation
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should: Chains directly off Cypress commands to assert expected conditions.�
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cy.get('.product-price').should('contain', '$19.99')
expect: Used within a .then() function for more complex assertions.�
LambdaTest
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cy.get('.product-price').then(($price) => {
  expect($price).to.contain('$19.99')
})
assert: Provides a traditional assertion style.�
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cy.get('.product-price').then(($price) => {
  assert.equal($price.text(), '$19.99')
})
Cypress supports a wide array of assertions, such as:�

Existence: should('exist')�
Cypress Documentation
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Visibility: should('be.visible')�
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Attribute Values: should('have.attr', 'type', 'submit')�
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Cypress Documentation
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CSS Properties: should('have.css', 'display', 'block')�
For an in-depth guide on writing assertions in Cypress, consult the official documentation: �
LambdaTest

Applying CSS Locators and Assertions in E-commerce Automation

In e-commerce applications, precise element selection and validation are crucial. For instance, to verify that a product's "Add to Cart" button is functional, you might:�

Locate the Button Using a CSS Selector:
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cy.get('.add-to-cart-button')
Assert Its Visibility:
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cy.get('.add-to-cart-button').should('be.visible')
Simulate a Click and Verify Cart Update:
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cy.get('.add-to-cart-button').click()
cy.get('.cart-count').should('contain', '1')