You will get Add Automated Tests to Your React App Vitest, Jest, playwright
Project details
Shipping features without tests? Afraid to refactor because something might break?
I add meaningful, maintainable automated tests to your React codebase —
unit tests, integration tests, and component tests that actually catch real bugs.
I write tests with:
✦ Vitest or Jest — fast, modern test runners
✦ React Testing Library — testing behavior, not implementation
✦ MSW (Mock Service Worker) — realistic API mocking
✦ user-event — simulating real user interactions
✦ Playwright or Cypress — E2E tests for critical flows
What I test:
→ React components (render, interaction, conditional UI)
→ Custom hooks (state logic, side effects, async behavior)
→ Utility functions and business logic
→ API integration layers (with proper mocking)
→ Authentication and permission guards
→ Form validation flows
My tests follow the Testing Trophy model: maximum value per test written.
I don't write tests for coverage percentages — I write tests that prevent real regressions
I add meaningful, maintainable automated tests to your React codebase —
unit tests, integration tests, and component tests that actually catch real bugs.
I write tests with:
✦ Vitest or Jest — fast, modern test runners
✦ React Testing Library — testing behavior, not implementation
✦ MSW (Mock Service Worker) — realistic API mocking
✦ user-event — simulating real user interactions
✦ Playwright or Cypress — E2E tests for critical flows
What I test:
→ React components (render, interaction, conditional UI)
→ Custom hooks (state logic, side effects, async behavior)
→ Utility functions and business logic
→ API integration layers (with proper mocking)
→ Authentication and permission guards
→ Form validation flows
My tests follow the Testing Trophy model: maximum value per test written.
I don't write tests for coverage percentages — I write tests that prevent real regressions
Programming Languages
JavaScript, TypeScriptWhat's included
| Service Tiers |
Starter
$120
|
Standard
$250
|
Advanced
$450
|
|---|---|---|---|
| Delivery Time | 3 days | 6 days | 12 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Optional add-ons
You can add these on the next page.
E2E test with Playwright for one critical user flow
(+ 2 Days)
+$90Frequently asked questions
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WS
Wassim S.
Jul 4, 2026
fix a bug in my web site
Great experience working with Marwen. He delivered fast, communicated clearly throughout, and kept me updated at every step. Quick to understand what I needed and easy to work with would definitely hire again
About Marwen
Senior Full Stack React Node.js Three.js React Native
Lisbon, Portugal - 1:39 am local time
Web · Mobile · 3D · Performance · Security
Freelance, B2B & contract — DM or email to get started.
Steps for completing your project
After purchasing the project, send requirements so Marwen can start the project.
Delivery time starts when Marwen receives requirements from you.
Marwen works on your project following the steps below.
Revisions may occur after the delivery date.
Codebase Review & Test Planning
You share secure repository access and specify your critical app components, hooks, or flows. I setup the environment and plan the testing strategy.
Test Suite Development & Mocking
I configure your testing tools (Vitest/Jest, React Testing Library) and write clean, regression-proof tests, including proper API or state mocking.