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Cypress configuration using cypress.config.js for e2e tests. Set baseUrl, specPattern, and env variables. Use setupNodeEvents and cy.task for Node.js tasks like database seeding. Create custom commands with cy.session for faster, reusable login flows and DRY tests.

Code Quality: ESLint/Prettier

How to configure ESLint rules

Code Quality: ESLint/Prettierconfig, customize, eslint, rules

ESLint configuration using the `extends` property to inherit a recommended base ruleset like `eslint:recommended`. Build on a shared community standard, a sane foundation for project-specific rules. This strategic choice catches common bugs and errors, avoiding a ruleset built from scratch.

Unit Testing: Jest

How to install and configure Jest

Unit Testing: Jestconfig, install, jest, setup

Optimize testing performance with test doubles to isolate code from slow dependencies. Identify "seams" in your application for efficient behavior alteration. Use mock implementations to eliminate delays caused by database queries, enhancing the speed and reliability of unit tests. Balance isolation and integration testing for effective results.

Code Quality: ESLint/Prettier

How to install ESLint in a JavaScript project

Code Quality: ESLint/Prettierconfig, eslint, install, quality

ESLint setup with npm scripts in package.json. Configuration for lint and lint:fix commands to analyze, target, and auto-fix JS/JSX files using the --fix flag.