Questions
4 of 7
1What is Cypress?
2What are the advantages and disadvantages of using Cypress?
3What browsers does Cypress support?
4Explain the architecture of Cypress.
5How Cypress Differs from Traditional Testing Tools
6What is a Fixture in Cypress?
7What is the difference between cy.fixture() and cy.readFile()?
CypressCypress
Basics
Test Writing and Syntax
Error Handling & Debugging
Locators and Interactions
Assertions
Cypress Commands
Network Requests
Test Organization & Reusability
Configuration
CI/CD Integration
Authentication Handling
Screenshots & Videos
04 / 07

Explain the architecture of Cypress.

Difficulty: 6/10
Test Runner, Browser Integration, Network Layer

Unlike Selenium, which operates outside the browser and communicates via remote commands, Cypress runs directly inside the browser, providing deeper integration and control over the application under test .​

Core Components of Cypress Architecture are:

Node.js Server Process
  1. 1

    Acts as the backbone of Cypress, handling tasks such as reading and writing files, interacting with the operating system, and performing network operations.​

  2. 2

    Manages communication between the Cypress Test Runner and the browser

Test Runner
  1. 1

    Provides an interactive GUI to write, run, and debug tests.​

  2. 2

    Displays real-time test execution, command logs, and allows for time-travel debugging by capturing snapshots at each test step

In Browser execution
  1. 1

    Cypress executes tests within the browser itself, enabling it to access and control the DOM, window objects, and network requests directly.​

  2. 2

    This in-browser execution allows for faster and more reliable tests compared to traditional frameworks .​

File System Access
  1. 1

    Through the Node.js process, Cypress can read and write files on the local file system.​

  2. 2

    This capability is useful for tasks like loading fixtures, saving screenshots, and recording videos of test runs .​

Network Proxy
  1. 1

    Intercepts and controls all HTTP requests and responses between the browser and the server.​

  2. 2

    Allows for stubbing and mocking of network requests, enabling testing of edge cases and network failures

API and Plugins
  1. 1

    Cypress offers a robust API for writing tests and supports a wide range of plugins to extend its functionality.

  2. 2

    Plugins can be used for tasks like code coverage analysis, visual testing, and integrating with CI/CD pipelines .​

Scenario Questions

0-2 years experience

  1. 1If you add a new Cypress test that clicks a button, where does the test code actually run—in Node or in the browser? Explain why that matters for accessing DOM elements.
  2. 2Your test is flaky because the page hasn't fully loaded before the first command. Which part of Cypress's architecture handles automatic waiting, and how would you use it to stabilize the test?
  3. 3You need to stub an API call in a Cypress test. Which component intercepts network requests, and what code would you write to set up the stub?

2-5 years experience

  1. 1During a CI run a test fails intermittently only in Chrome but passes in Electron. Walk me through how Cypress's architecture could cause browser‑specific differences and how you'd debug it.
  2. 2We want to run Cypress tests in parallel across multiple agents and collect results in the Dashboard. Which architectural pieces must be configured, and what trade‑offs do you consider regarding test isolation and shared state?
  3. 3Your team needs a custom command that reads a file from the filesystem. Explain how you'd implement this given Cypress's separation between the Node test runner and the browser.

5-8 years experience

  1. 1A large suite of Cypress tests now takes 30 minutes to run. Discuss architectural optimizations—such as test runner parallelization, caching, and network stubbing—that could reduce runtime.
  2. 2A flaky test is caused by a race condition between Cypress's command queue and an external WebSocket that updates the UI. How would you modify the Cypress architecture or test code to mitigate this issue?
  3. 3Explain how you'd test a micro‑frontend application where each micro‑frontend runs in its own iframe. What architectural challenges arise and how would you address them?

8+ years experience

  1. 1Our organization is migrating from Selenium to Cypress across several product lines. Outline a migration strategy that respects Cypress's architecture (test runner, server, Dashboard, CI integration) while minimizing disruption.
  2. 2Design a shared Cypress testing infrastructure for multiple teams with differing security constraints—some need isolated containers, others can use the Dashboard. What architectural decisions support scalability, security, and maintainability?
  3. 3Cypress currently runs tests in a single process per browser. Propose an architectural change to enable distributed test execution on a Kubernetes cluster, and discuss implications for command‑queue synchronization and result aggregation.

Follow-up Questions

  • How does Cypress's automatic waiting differ from explicit waits in Selenium?
  • What are the limitations of the Cypress Dashboard for parallel execution?
  • Can you access environment variables from both Node and browser contexts? Explain.
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