Most teams test in layers that do not talk to each other. The frontend developers write their tests. The backend developers write theirs. Nobody tests the full stack until integration, and by then the surprises are expensive.
Fullstack testing means testing from the outside in — starting with the behaviour the user sees and working through React components, API endpoints, business logic, and persistence. Every layer tested. Every layer connected.
This course teaches you how to build a cohesive testing strategy across a Java backend and a React frontend written in TypeScript, using the right tool at every level.
Day 1 — Outside-in with BDD and browser automation
You start where the user starts — in the browser. You write Behaviour-Driven Development scenarios in Gherkin that describe what the application should do. Then you automate them with Playwright or Selenium, driving a real browser against a running application.
This gives you a walking skeleton — a thin slice of functionality that works end to end. The acceptance test is red. Now you have a goal.
You drop into the React frontend and write component tests with Vitest. Fast, isolated, focused on behaviour. You build the UI in TypeScript that the acceptance test expects.
Day 2 — TDD on the backend and connecting the layers
With the frontend in place, you turn to the Java backend. Test-Driven Development drives the API layer, the business logic, and the persistence layer. Red, green, refactor — one baby step at a time.
You will use the same interface technique from the TDD course: define a contract, drive an in memory stub for fast tests, then implement the real database access against the same contract. Fast where speed matters, real where confidence matters.
When the backend is done, you run the acceptance test again. Green. The full stack works, and every layer has its own tests proving it.
What you bring home
A testing strategy that covers every layer — from React components tested with Vitest in TypeScript, through Java business logic tested with Test-Driven Development, to browser tests that prove the whole thing works together. One workflow, not four separate ones.