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React & Next.js Practical UI Labs

Quality & Testing

Behavior tests, recoverable errors, measured rendering, and Playwright critical flows.

4 drillsPractice one at a timeOrdered pathCoding problem

Recommended start

Behavior Test

Tests validation, focus, pending state, and the save contract through accessible user interactions rather than component internals.

Easy~15 minStep 1 of 4

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1Behavior TestRecommended startTests validation, focus, pending state, and the save contract through accessible user interactions rather than component internals.Coding problemEasy~15 minNext.jsReactTypeScriptPractice 2

Practice order

4 drillsOne at a time

1Behavior TestUp next / Easy / ~15 min
2Recoverable ErrorMedium / ~25 min
3Render PerformanceMedium / ~25 min
4

Recoverable ErrorBuilds a route-level Next.js failure UI with safe reporting, retry, and an escape route while keeping expected errors out of the boundary.Coding problemMedium~25 minNext.jsReactTypeScript

Practice

3Render PerformanceUses profiler evidence to isolate expensive derived data and row rendering, then applies memoization without hiding correctness bugs.Coding problemMedium~25 minNext.jsReactTypeScriptPractice

4Critical Flow E2ETests one browser-to-database practice workflow with isolated fixtures, resilient locators, durable assertions, and reliable cleanup.Coding problemHard~35 minNext.jsPlaywrightReactPractice

Critical Flow E2E

Hard / ~35 min

Quality & Testing - React & Next.js Practical UI Labs | Aporeon