Testing in MERN/NestJS

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Training Key Features

  • Testing pyramid and tooling overview
  • Unit testing with Jest (spies, timers, async flows)
  • End-to-end testing with Cypress (auth, routing, stubbing)
  • TDD and BDD workflows with best practices
  • CI/CD setup with parallelization and artifact management
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What will be Cover ?

Module 1 – Testing Pyramid
  • Concepts
  • Tooling overview
Module 2 – Jest Unit Tests
  • Spies
  • Timers
  • Async testing
Module 3 – Supertest Integration
  • API contracts
  • REST validation
Module 4 – Cypress E2E
  • Authentication
  • Routing
  • Network stubbing
Module 5 – Mocking
  • Test doubles
  • Contract testing strategies
Module 6 – TDD/BDD
  • Workflows
  • Pitfalls
  • Best practices
Module 7 – Snapshot Testing
  • React components
  • When to use
  • When not
Module 8 – Database Testing
  • Test containers
  • Seed
  • Teardown
Module 9 – CI Setup
  • Parallelization
  • Artifacts
  • Flaky test management
Module 10 – Coverage & Quality
  • Coverage thresholds
  • Quality gates
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Course Detail

Benefits: This course equips learners with the ability to deliver reliable software rapidly by mastering testing strategies across the MERN and NestJS ecosystems. Students will gain hands-on experience with the testing pyramid, writing unit tests with Jest, API contract testing with Supertest, and end-to-end flows with Cypress. They will also learn effective mocking techniques, apply TDD/BDD workflows, and implement snapshot testing in React. Beyond functional correctness, the course emphasizes database testing with containers, CI/CD automation, coverage analysis, and quality gates. By the end, participants will be confident in building robust test suites that accelerate delivery while ensuring quality and stability.