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Top 100 Cypress Interview Questions and Answers

Top 100 Cypress Interview Questions and Answers

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1. What is Cypress?

Cypress is an end-to-end testing framework for web applications. It provides fast, reliable, and easy-to-write tests.

// Example Cypress test
it('Visits the homepage', () => {
  cy.visit('https://example.com')
  cy.contains('Example Domain')
})

2. How does Cypress differ from other testing frameworks?

Cypress operates directly in the browser and executes tests within it. This enables it to closely interact with the application, providing real-time feedback.

// Example of interacting with a form field
cy.get('input[name="username"]').type('JohnDoe')

3. What is the purpose of Cypress commands like cy.get()?

cy.get() is used to select DOM elements. It allows you to interact with and make assertions on the selected elements.

// Example of using cy.get()
cy.get('.login-button').click()

4. How does Cypress handle asynchronous tasks?

Cypress automatically waits for commands and assertions to complete before moving on, eliminating the need for explicit waits or sleeps.

// Example of handling asynchronous tasks
cy.get('.loading-spinner').should('not.exist')

5. How can you perform assertions in Cypress?

Cypress provides a range of assertion commands like should() and expect() to verify the state of elements or application.

// Example of using assertions
cy.get('.login-message').should('contain', 'Welcome!')

6. Explain Cypress’ concept of “cy.fixture()”.

cy.fixture() is used to load external fixture files (like JSON or YAML) containing test data.

// Example of using cy.fixture()
cy.fixture('users.json').then((users) => {
  // Use 'users' object in the test
})

7. How do you handle login scenarios in Cypress?

You can use cy.request() to make HTTP requests, allowing you to bypass the UI for tasks like logging in.

// Example of logging in using cy.request()
cy.request('POST', '/login', { username: 'JohnDoe', password: 'password' })

8. What are custom Cypress commands?

Custom commands are user-defined Cypress commands that can be reused across multiple tests.

// Example of defining a custom command
Cypress.Commands.add('login', (username, password) => {
  // Custom login logic
})

9. How do you handle file uploads in Cypress?

Cypress doesn’t support file uploads directly, but you can use libraries like cypress-file-upload for this.

// Example of using cypress-file-upload
cy.get('input[type="file"]').attachFile('file.txt')

10. Explain how to work with iframes in Cypress.

You can use cy.iframe() to interact with elements inside an iframe.

// Example of working with iframes
cy.iframe('.iframe-selector').find('.element-inside-iframe').click()

11. What is the purpose of Cypress plugins?

Cypress plugins extend Cypress’ functionality. They can be used for tasks like adding custom commands or loading data.

// Example of a Cypress plugin
module.exports = (on, config) => {
  // Define custom tasks or configurations here
}

12. How can you run Cypress tests in headless mode?

You can run Cypress tests in headless mode using the command npx cypress run.

npx cypress run --headless

13. What is Cypress’ role in continuous integration (CI)?

Cypress can be integrated into CI pipelines to automate the testing process for every code change.

# Example of running Cypress in a CI pipeline
- run:
    name: Cypress Tests
    command: npx cypress run --headless

14. How do you handle test retries in Cypress?

You can use Cypress’ built-in retry() command to automatically retry a test step.

// Example of using retry()
cy.get('.loading-spinner').should('not.exist').retry()

15. Explain how Cypress handles cross-origin requests.

Cypress can bypass the browser’s same-origin policy to make requests to different domains using cy.request().

// Example of making a cross-origin request
cy.request('https://api.example.com/data').then((response) => {
  // Handle the response
})

16. How do you set up environment variables in Cypress?

You can use Cypress.env() to access environment variables defined in your Cypress configuration.

// Example of accessing environment variables
const apiUrl = Cypress.env('API_URL')

17. Explain the purpose of Cypress’ before() and beforeEach() hooks.

before() runs once before all tests, while beforeEach() runs before each test. They are used for setup tasks.

// Example of using hooks
before(() => {
  // Setup tasks
})

beforeEach(() => {
  // Setup tasks before each test
})

18. How do you mock API responses in Cypress?

You can use the cy.route() command to intercept and mock API responses.

// Example of mocking an API response
cy.route('GET', '/api/data', { data: 'mocked data

' })

19. What is the purpose of Cypress’ plugins file?

The pluginsFile.js in Cypress allows you to extend Cypress’ functionality by adding custom code.

// Example of a custom Cypress plugin
module.exports = (on, config) => {
  // Define custom tasks or configurations here
}

20. How do you generate code coverage reports in Cypress?

You can use a plugin like @cypress/code-coverage to generate code coverage reports.

// Example of configuring code coverage plugin
module.exports = (on, config) => {
  on('task', require('@cypress/code-coverage/task'))
  return config
}

21. How can you interact with cookies in Cypress tests?

Cypress provides cy.setCookie() and cy.getCookie() commands to interact with cookies.

// Example of setting and getting cookies
cy.setCookie('token', '123456')
cy.getCookie('token').should('have.property', 'value', '123456')

22. What is a Page Object Model (POM) in Cypress?

The Page Object Model is a design pattern that helps structure your Cypress tests by encapsulating page-specific elements and interactions into reusable objects.

// Example of a Page Object in Cypress
class LoginPage {
  visit() {
    cy.visit('/login')
  }

  fillUsername(username) {
    cy.get('[data-test=username]').type(username)
  }

  fillPassword(password) {
    cy.get('[data-test=password]').type(password)
  }

  submit() {
    cy.get('[data-test=submit]').click()
  }
}

23. How do you handle dynamic elements in Cypress?

You can use cy.contains() with a regular expression to locate elements with dynamic text.

// Example of selecting dynamic elements
cy.contains(/^Submit \d+$/).click()

24. What is the purpose of Cypress’ cy.wait() command?

cy.wait() is used to pause the test execution until a specific condition is met, like an element becoming visible.

// Example of using cy.wait()
cy.get('.loading-spinner').should('not.exist')
cy.wait(1000) // Wait for 1 second

25. How can you handle browser alerts in Cypress?

You can use cy.on('window:alert') to handle browser alerts.

// Example of handling a browser alert
cy.on('window:alert', (message) => {
  expect(message).to.equal('This is an alert message')
})

26. What is the purpose of the cy.viewport() command?

cy.viewport() allows you to set the dimensions of the viewport to test responsive behavior.

// Example of setting viewport dimensions
cy.viewport(1280, 720) // Set to 1280x720

27. How do you work with iframes in Cypress?

Cypress provides cy.iframe() to interact with elements inside an iframe.

// Example of working with iframes
cy.iframe('.iframe-selector').find('.element-inside-iframe').click()

28. Explain the concept of Cypress commands chaining.

In Cypress, commands can be chained together to create a sequence of actions and assertions.

// Example of command chaining
cy.get('.input-field').type('Cypress').should('have.value', 'Cypress')

29. What is the purpose of the cy.exec() command in Cypress?

cy.exec() is used to run arbitrary shell commands on your local machine.

// Example of using cy.exec()
cy.exec('npm run my-custom-task')

30. How can you take screenshots and videos during Cypress tests?

Cypress automatically captures screenshots and records videos during test runs.

// Configuration to capture screenshots and videos
{
  "screenshotsFolder": "cypress/screenshots",
  "videosFolder": "cypress/videos"
}

31. Explain how to work with multiple browser tabs in Cypress.

Cypress doesn’t support multi-tab testing directly, but you can use custom JavaScript to interact with new tabs.

// Example of opening a new tab and switching
cy.visit('https://example.com')
cy.window().then((win) => {
  win.open('https://new-tab-url.com')
  // Switch to the new tab and perform actions
})

32. What is the purpose of the cy.clock() command in Cypress?

cy.clock() allows you to control the system clock in your tests, which can be useful for testing time-related functionality.

// Example of using cy.clock()
cy.clock()
cy.tick(5000) // Move the clock forward by 5 seconds

33. How do you perform load testing with Cypress?

Cypress is not designed for load testing. Tools like k6 or JMeter are more suitable for that purpose.

// Example using k6 for load testing
import http from 'k6/http'

export default function () {
  http.get('https://example.com')
}

34. Explain how to set up parallel test execution in Cypress.

You can use a tool like Cypress Dashboard or CI/CD services to set up parallel test execution.

# Example of parallel test execution in CI/CD
- run:
    name: Cypress Tests
    command: npx cypress run --record --parallel

35. What are some best practices for writing Cypress tests?

  • Use Page Object Model (POM) for better organization.
  • Write small, focused tests.
  • Use Cypress’ built-in commands for common actions.
  • Avoid using cy.wait() as much as possible.

36. How do you handle flaky tests in Cypress?

Flaky tests can be challenging. To reduce flakiness, ensure your tests have proper assertions and handle wait conditions effectively.


37. How can you handle authentication pop-ups in Cypress?

You can use cy.on('window:confirm') to handle authentication pop-ups.

// Example of handling an authentication pop-up
cy.on('window:confirm', () => true) // Clicks 'OK'

38. What is the purpose of Cypress’ cy.route() command?

cy.route() is used to intercept and mock HTTP requests made by the application.

// Example of using cy.route() to mock an API response
cy.route('GET', '/api/data', { data: 'mocked data' })

39. How do you perform visual regression testing in Cypress?

Cypress does not have built-in support for visual regression testing. Tools like Percy or Applitools can be integrated for this purpose.

// Example of using Applitools for visual regression testing
cy.eyesOpen({
  appName: 'My App',
  testName: 'Login Page',
  browser: { width: 800, height: 600 }
})
cy.eyesCheckWindow('Login Page')
cy.eyesClose()

40. Explain how to handle third-party integrations in Cypress tests.

For third-party integrations, you can use cy.intercept() to intercept and mock responses.

// Example of handling a third-party integration
cy.intercept('POST', 'https://third-party-api.com/endpoint', {
  statusCode: 200,
  body: { success: true }
})

41. How do you test a mobile application using Cypress?

Cypress primarily focuses on web applications, but you can use tools like Cypress-real-device-testing for mobile testing.

npm install cypress-real-device-testing
npx cypress run --browser chrome:android --headless

42. What is the purpose of Cypress’ cy.screenshot() command?

cy.screenshot() captures a screenshot of the current state of the application.

// Example of using cy.screenshot()
cy.screenshot('my-screenshot')

43. How can you handle database interactions in Cypress tests?

Cypress doesn’t have built-in support for database interactions. You may need to use other tools or libraries like cy.task() to interact with databases.

// Example of using cy.task() for database interaction
cy.task('queryDatabase', 'SELECT * FROM users')

44. Explain how to set up continuous integration with Cypress in a CI/CD pipeline.

Integrate Cypress into your CI/CD pipeline by installing Cypress and running tests using a headless browser.

# Example of running Cypress in a CI/CD pipeline
- run:
    name: Cypress Tests
    command: npx cypress run --headless

45. How do you handle dynamic data in Cypress tests?

You can use fixtures or custom commands to handle dynamic data.

// Example of using fixtures
cy.fixture('users.json').then((users) => {
  const randomUser = users[Math.floor(Math.random() * users.length)]
  cy.get('.username-input').type(randomUser.username)
})

46. What is the purpose of Cypress’ cy.contains() command?

cy.contains() is used to find DOM elements by their text content.

// Example of using cy.contains()
cy.contains('Submit').click()

47. How do you handle timeouts in Cypress tests?

You can adjust the timeout for specific commands using options like .click({ timeout: 10000 }) or globally in your configuration file.

// Example of adjusting timeout for a command
cy.get('.element').click({ timeout: 10000 })

48. What is the purpose of Cypress’ cy.get() command?

cy.get() is used to select DOM elements for further interaction or assertion.

// Example of using cy.get()
cy.get('.login-button').click()

49. How do you handle data-driven testing in Cypress?

You can use loops or custom commands to perform data-driven testing.

// Example of data-driven testing using a loop
const usernames = ['user1', 'user2', 'user3']
usernames.forEach((username) => {
  cy.get('.username-input').type(username)
  cy.get('.submit-button').click()
})

50. Explain how to handle API testing in Cypress.

Use cy.request() to make HTTP requests and assertions to validate API responses.

// Example of making an API request and asserting response
cy.request('GET', 'https://api.example.com/data').then((response) => {
  expect(response.status).to.equal(200)
  expect(response.body).to.have.property('data')
})

51. How do you handle environment-specific configuration in Cypress?

You can use environment variables or configuration files to manage environment-specific settings.

// Example of environment-specific configuration
const apiUrl = Cypress.env('API_URL') // Using environment variables
cy.visit(Cypress.config('baseUrl')) // Using configuration file

52. Explain the concept of test runners in Cypress.

Test runners execute your Cypress tests. Popular test runners include the Cypress Test Runner and Cypress Dashboard.

# Example of running tests using the Cypress Test Runner
npx cypress open

53. What is the purpose of the cy.get() command’s .find() method?

The .find() method is used to search for child elements within elements selected by cy.get().

// Example of using .find()
cy.get('.parent-element').find('.child-element').click()

54. How do you handle assertions for elements that should not exist?

You can use .should('not.exist') to assert that an element should not be present.

// Example of asserting element does not exist
cy.get('.element').should('not.exist')

55. Explain how to configure Cypress to run tests in different browsers.

Cypress supports running tests in various browsers by configuring browser launch settings in the cypress.json file.

// Example of configuring browsers
{
  "browsers": ["chrome", "firefox"]
}

56. What is the purpose of the cy.clearCookies() command in Cypress?

cy.clearCookies() is used to clear all cookies for the current domain.

// Example of using cy.clearCookies()
cy.clearCookies()

57. How do you handle failed assertions in Cypress tests?

Cypress will automatically retry assertions by default. You can also customize retries using .should() options.

// Example of customizing retries
cy.get('.loading-spinner').should('not.exist', { timeout: 10000 })

58. Explain how to set up data fixtures in Cypress.

Data fixtures are JSON or other files containing test data. You can place them in the fixtures directory.

// Example of using data fixtures
cy.fixture('users.json').then((users) => {
  cy.get('.username-input').type(users[0].username)
})

59. What is the purpose of the cy.reload() command in Cypress?

cy.reload() is used to refresh the page during a test.

// Example of using cy.reload()
cy.reload()

60. How do you handle authentication in Cypress for applications with login pages?

You can use cy.request() to make a POST request to the login endpoint with credentials.

// Example of logging in using cy.request()
cy.request('POST', '/login', { username: 'user', password: 'pass' })

61. Explain how to use the cy.get() command with data attributes.

You can select elements with specific data attributes using [data-*] selectors.

// Example of selecting elements with data attributes
cy.get('[data-test=submit-button]').click()

62. How can you execute a specific test file in Cypress?

You can use the --spec flag to specify the path to a specific test file.

# Example of running a specific test file
npx cypress run --spec cypress/integration/login.spec.js

63. What is the purpose of the cy.intercept() command in Cypress?

cy.intercept() is used to intercept and stub network requests to control responses during testing.

// Example of intercepting and stubbing a network request
cy.intercept('GET', '/api/data', { fixture: 'sample-data.json' })

64. Explain how to set up custom commands in Cypress.

Define custom commands in your project’s commands.js file.

// Example of defining a custom command
Cypress.Commands.add('login', (username, password) => {
  // Custom login logic
})

65. How do you handle file downloads in Cypress tests?

Cypress does not have built-in support for file downloads. You may need to use workarounds like intercepting download requests.

// Example of intercepting a file download request
cy.intercept('GET', '/downloads/file.pdf').as('fileDownload')
cy.get('.download-button').click()
cy.wait('@fileDownload')

66. How can you handle CORS (Cross-Origin Resource Sharing) issues in Cypress?

Cypress can bypass CORS restrictions using the cy.visit() command and the chromeWebSecurity option.

// Example of handling CORS issues
cy.visit('https://example.com', {
  chromeWebSecurity: false
})

67. What is the purpose of the cy.contains() command’s .within() method?

.within() is used to limit commands to act only within a specific element context.

// Example of using .within()
cy.get('.user-profile').within(() => {
  cy.contains('Edit Profile').click()
})

68. How do you manage test data cleanup in Cypress?

You can use beforeEach() or afterEach() hooks to set up and clean up test data.

// Example of data cleanup in beforeEach() and afterEach()
beforeEach(() => {
  // Set up test data
})

afterEach(() => {
  // Clean up test data
})

69. Explain the purpose of Cypress’ cy.request() retry mechanism.

Cypress can automatically retry network requests using the retryOnNetworkFailure option.

// Example of enabling request retry
cy.request('/api/data', { retryOnNetworkFailure: true })

70. How can you skip specific tests in Cypress?

You can use it.skip() to skip specific tests temporarily.

// Example of skipping a test
it.skip('This test is skipped', () => {
  // Test code
})

71. Explain how to configure Cypress to use TypeScript.

To use TypeScript with Cypress, install TypeScript and create a tsconfig.json file in your project.

npm install typescript
// Example of tsconfig.json for Cypress
{
  "compilerOptions": {
    "target": "ES6"
  },
  "include": [
    "./cypress/**/*.ts"
  ]
}

72. What is the purpose of the cy.get() command’s .eq() method?

.eq() is used to select a specific element from a list of elements matched by cy.get().

// Example of using .eq()
cy.get('.list-item').eq(2).click() // Clicks the third item

73. How do you handle test dependencies in Cypress?

You can use cy.route() or cy.intercept() to stub responses for dependent APIs.

// Example of handling test dependencies
cy.route('GET', '/api/data', { data: 'mocked data' })

74. Explain how to configure Cypress to use a custom browser.

You can configure Cypress to use a custom browser by specifying it in your configuration file.

// Example of configuring a custom browser
{
  "browser": "path/to/custom-browser.exe"
}

75. How can you test authentication flows in Cypress?

You can simulate authentication flows by using custom commands or intercepting network requests.

// Example of testing authentication flows
cy.login('username', 'password')
cy.visit('/dashboard')
cy.contains('Welcome, User')

76. What is the purpose of the cy.get() command’s .contains() method?

.contains() is used to find elements containing specific text.

// Example of using .contains()
cy.get('.nav').contains('About Us').click()

77. How do you handle focus-related tests in Cypress?

You can use the .focus() method to simulate focusing on an element.

// Example of focusing on an element
cy.get('.search-input').focus()

78. What is the purpose of the cy.request() command’s .its() method?

.its() is used to access properties of the response object returned by cy.request().

// Example of using .its()
cy.request('/api/data').its('body').should('have.property', 'name', 'John')

79. Explain how to perform parallel test execution in Cypress.

Cypress supports parallel test execution with the --parallel flag.

# Example of running tests in parallel
npx cypress run --record --parallel

80. How can you set up custom reporters in Cypress?

You can use third-party plugins like mochawesome to set up custom reporters for test results.

// Example of configuring a custom reporter
{
  "reporter": "mochawesome",
  "reporterOptions": {
    "reportDir": "cypress/reports"
  }
}

81. How can you handle random or dynamically generated data in Cypress tests?

You can use fixtures or custom commands to handle dynamic data.

// Example of using fixtures with dynamic data
cy.fixture('users.json').then((users) => {
  const randomUser = users[Math.floor(Math.random() * users.length)]
  cy.get('.username-input').type(randomUser.username)
})

82. Explain how to handle route aliases in Cypress.

Route aliases allow you to easily reference network requests.

// Example of using route aliases
cy.intercept('GET', '/api/data').as('getData')
cy.visit('/dashboard')
cy.wait('@getData').then((interception) => {
  // Access response data
})

83. How do you handle hover actions in Cypress tests?

Cypress does not support hover actions directly, but you can use custom JavaScript to trigger hover events.

// Example of triggering a hover event
cy.get('.element').trigger('mouseover')

84. Explain how to perform load testing with Cypress.

Cypress is not designed for load testing. Tools like k6 or JMeter are more suitable for that purpose.

// Example using k6 for load testing
import http from 'k6/http'

export default function () {
  http.get('https://example.com')
}

85. How do you handle test retries in Cypress?

You can use Cypress’ built-in retry() command to automatically retry a test step.

// Example of using retry()
cy.get('.loading-spinner').should('not.exist').retry()

86. Explain how to use environment variables in Cypress.

You can use Cypress.env() to access environment variables defined in your Cypress configuration.

// Example of accessing environment variables
const apiUrl = Cypress.env('API_URL')

87. What is the purpose of Cypress’ cy.scrollTo() command?

cy.scrollTo() is used to scroll to a specific element on the page.

// Example of using cy.scrollTo()
cy.get('.end-of-page-element').scrollIntoView()

88. How do you handle JavaScript pop-ups in Cypress?

You can use cy.on('window:confirm') or similar events to handle JavaScript pop-ups.

// Example of handling a JavaScript pop-up
cy.on('window:confirm', () => true) // Clicks 'OK'

89. What is the purpose of Cypress’ .its() command?

.its() is used to access properties of an object.

// Example of using .its()
cy.get('.user-profile').its('href').should('include', '/profile')

90. How can you interact with elements that have dynamic IDs in Cypress?

You can use attribute selectors with partial matches to interact with elements.

// Example of using attribute selector with partial match
cy.get('[id^="dynamic-id-start"]').click()

91. Explain how to handle long-running tasks in Cypress.

Cypress automatically waits for commands and assertions to complete before moving on, but you can adjust timeouts if needed.

// Example of adjusting timeout for a command
cy.get('.long-running-task').click({ timeout: 10000 }) // Set timeout to 10 seconds

92. What is the purpose of the cy.title() command in Cypress?

cy.title() is used to get the title of the current page.

// Example of using cy.title()
cy.title().should('eq', 'Page Title')

93. How do you handle multiple assertions in Cypress?

You can chain multiple assertions using .should().

// Example of multiple assertions
cy.get('.element')
  .should('be.visible')
  .and('have.class', 'active')

94. What is the purpose of the cy.wrap() command in Cypress?

cy.wrap() is used to wrap an object and continue the chain.

// Example of using cy.wrap()
const user = { name: 'John Doe' }
cy.wrap(user).should('have.property', 'name')

95. How do you handle data encryption or decryption in Cypress?

Cypress doesn’t have built-in support for encryption/decryption. You may need to use external libraries or services for this.

// Example using a library for encryption
import CryptoJS from 'crypto-js'
const encryptedData = CryptoJS.AES.encrypt('secret', 'password').toString()

96. Explain how to use custom data attributes in Cypress.

You can select elements with specific data attributes using [data-*] selectors.

// Example of selecting elements with custom data attributes
cy.get('[data-test=submit-button]').click()

97. What is the purpose of Cypress’ .its() command?

.its() is used to access properties of an object.

// Example of using .its()
cy.get('.user-profile').its('href').should('include', '/profile')

98. How can you interact with elements inside an iframe in Cypress?

You can use cy.iframe() to interact with elements inside an iframe.

// Example of working with iframes
cy.iframe('.iframe-selector').find('.element-inside-iframe').click()

99. What is the purpose of Cypress’ cy.trigger() command?

cy.trigger() is used to manually trigger events on DOM elements.

// Example of using cy.trigger()
cy.get('.element').trigger('mouseover')

100. How do you handle testing in different resolutions in Cypress?

You can use cy.viewport() to set the dimensions of the viewport and test responsiveness.

// Example of setting viewport dimensions
cy.viewport(128

0, 720) // Set to 1280x720