Testing & DebuggingLesson 75Free preview

Node Testing Apps

This lesson is part of Node.js · All levels

Summary

This lesson explains why testing is important in applications and how to get started. You'll learn three main levels: unit test, integration test, and end-to-end test. In addition, the principles of first test, fast feedback, and dependency separation are key to making code easy to test. (Node.js)

Key points

Unit test tests individual functions without a database/network; integration test tests combined components; E2E tests user flow.
The main goal: to capture regression faster and give confidence during refactoring.
The code that is easy to test relies on dependency injection and pure logic separation from I/O.
Good tests are deterministic, fast, and isolated between tests.
Run the npm test as a gate before merging/deploying.

Full lesson

Code examples and quizzes

Full lessons, code examples, and quizzes are available to subscribers. 5 questions.