Free Course — No signup required

Master Software Testing
in 5 Days

Untested code is broken code you haven't found yet. Learn unit tests, integration tests, end-to-end tests, TDD, and how to measure coverage.

5 lessons
Self-paced
~60 min/day
Free forever
Start Day 1 — Free → See what's covered
What you'll learn

Software Testing in 5 Days

Untested code is broken code you haven't found yet. Learn unit tests, integration tests, end-to-end tests, TDD, and how to measure coverage.

  • Write unit tests with Jest or pytest
  • Test React components with Testing Library
  • Write integration tests against real databases
  • Automate browser tests with Playwright
  • Practice TDD: write the test first
5
practical lessons
TDD
write test first
$0
cost to take this course
E2E
full browser automation
5-Day Curriculum

Every lesson ships working code.
No theory without practice.

01
Unit Testing with Jest
Install Jest, write your first tests, use describe/it/expect, mock dependencies, and run tests in watch mode.
Jestdescribe/itexpectmocks
→
02
Testing React Components
Use React Testing Library to test components from the user's perspective. Query by role, text, and label — not by className.
render()getByRoleuserEventwaitFor
→
03
Integration Testing
Test routes and database interactions together. Set up a test database, seed data, and tear down after each test.
supertesttest DBbeforeEachteardown
→
04
End-to-End Testing with Playwright
Install Playwright, write browser automation tests, handle async UI, take screenshots on failure, and run in CI.
Playwrightpage.gotolocatorsCI screenshots
→
05
TDD and Coverage
Practice Test-Driven Development: red, green, refactor. Measure coverage with Istanbul, set coverage thresholds, avoid coverage theater.
TDD cycleistanbulcoverage thresholdsmeaningful tests
→
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Your instructor
B
Bo Peng
Founder, Precision AI Academy

Kaggle Top 200 data scientist. Trained 400+ professionals across universities and federal agencies. Built production systems used by thousands. This course skips toy examples and gives you patterns that work in real projects.

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