Rigorous trainer selection
Each trainer is validated on three criteria: hands-on field expertise, proven pedagogy and alignment with your industry.
- Triple validation: technical, pedagogical, sectoral.
- Minimum rating 4.8/5 over the last 12 sessions.
Learning objectives
- Master Testing Library for professional and maintainable tests in a corporate environment
- Develop advanced queries simulating real user interactions
- Implement mocks and spies to test complex components
- Design certifiable integration tests with API and global state
- Optimize test suites for CI/CD and production performance
- Deploy Testing Library practices aligned with professional standards
The Learni story
Founded by passionate learning and innovation experts, Learni's mission is to make professional training accessible to everyone, anywhere in the world. Our team operates in major hubs — London, New York, Boston — and internationally, to support talents and organizations in upskilling.
Don't let this gap widen
Why this program matters
Without this upskilling, your team accumulates a technological gap that translates directly into productivity loss.
Organizations that don't train their talents on key topics see their competitiveness drop.
Every quarter without training is a gap widening with competitors who invest.
The cost of inaction quickly exceeds that of well-targeted training.
Program
Module 1Testing Library Setup: Advanced Configuration and Professional Environment (Jest, RTL, MSW)
Complete installation and configuration of Testing Library with Jest for enterprise React projects, hands-on with custom renderers and providers to simulate Context and Redux, practical exercises on a realistic ongoing project, creation of data fixtures, first component tests with byRole and byText queries, code review to adopt best practices from the start, production of a stable and scalable test suite.
Module 2Advanced Testing Library Queries: User Interactions and Precise Assertions (userEvent, fireEvent)
In-depth exploration of priority queries like getByRole and findByText for accessible tests, simulation of complex events with userEvent for realistic clicks, focus, and input, integrated accessibility tests via axe-core, real-world cases on dynamic forms and modals, interactive debugging with screen.debug, optimization of assertions to avoid fragile data-testid, delivery of robust tests ready for the team.
Module 3Testing Library Mocking: API, Timers, and Modules for Isolated Tests (MSW, vi.mock, jest.useFakeTimers)
Setup of HTTP mocks with MSW to intercept API calls without a real backend, mocking of third-party modules and custom hooks, management of timers and animations with jest.advanceTimersByTime, exercises on asynchronous components and lazy loading, tests of critical code like useEffect and useCallback, refactoring of an existing project for perfect isolation, immediate gains in test speed and reliability in a professional context.
Module 4Testing Library Integration Tests: Global State and Complex Components (Redux, Context, Portals)
Integration of Testing Library with Redux Toolkit and React Query to test full flows, simulation of global states and nested providers, tests of portals and modal components outside the root DOM, real e-commerce scenarios with persistent carts and authentication, test performance profiling with Jest Coverage, production of detailed reports, alignment with corporate quality requirements for rapid certification.
Module 5Testing Library Optimization: CI/CD, Best Practices, and Maintenance (GitHub Actions, Playwright Hybrid)
Deployment of CI/CD pipelines with Testing Library via GitHub Actions and Vitest, hybridization with Playwright for lightweight E2E tests, massive refactoring for parallelization and caching, audit of code smells and flaky tests, workshops on advanced patterns like testing-library/user-event v14, finalization of the ongoing project with 90%+ coverage, delivery of a professional playbook for teams, direct productivity boost in the enterprise.
Evaluation method
- Certifying MCQ on advanced Testing Library practices
- Continuous evaluation through exercises and ongoing project
- Technical presentation of the test portfolio to experts
Learning method
- Sessions led by certified trainers currently employed at tech leaders
- Practical exercises on authentic business cases and open-source projects
- Evolving ongoing project to anchor certifiable skills
- Complete digital learning resources with permanent updates
Methods, materials and delivery
The Training Testing Library - Reliable Advanced React Unit Tests program is delivered onsite or remote (blended-learning, e-learning, virtual classroom, remote presence). At Learni, an industry-certified training organization, every program is built to maximize skills acquisition regardless of the chosen format.
The trainer alternates between demonstrative, interrogative and active methods (through hands-on labs and/or scenarios). This pedagogical approach guarantees concrete learning that's immediately applicable at work.
Equipment required
For the smooth delivery of the Training Testing Library - Reliable Advanced React Unit Tests program, the following equipment is required:
- Mac or PC computers, high-speed fiber internet, whiteboard or flipchart, projector or interactive touch screen (for remote sessions)
- Training environments installed on workstations or accessible online
- Course materials, hands-on exercises and complementary resources
- Post-training access to materials and educational resources
For intra-company training on a site outside Learni, the client commits to providing all required teaching materials (computers, internet, etc.) for the smooth delivery of the program in line with the prerequisites in the communicated program.
* contact us for remote delivery feasibility** ratio varies depending on the program
Skills assessment methods
Assessment of skills acquired during the Training Testing Library - Reliable Advanced React Unit Tests program is performed through:
- During training: case studies, hands-on labs and professional scenarios
- End of training: self-assessment questionnaire and skills evaluation by the trainer
- After training: completion certificate detailing acquired skills
Program accessibility
Learni is committed to making its programs accessible. All our programs are accessible to people with disabilities. Our teams are available to adapt the pedagogical methods to your specific needs. Please contact us for any adjustment request.
Enrollment terms and lead times
Learni programs are available inter-company and intra-company, onsite or remote. Enrollments are possible up to 48 business hours before the program starts. Our programs are eligible for corporate funding paths. Contact us to discuss your training project and funding options.
Verified reviews
What our learners
★★★★★
« cool, j'ai appris des trucs »
★★★★★
« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »
★★★★★
« la formation dev etait intense mais grave bien. merci Anthony Khelil »
★★★★★
« 😊👍 »
★★★★★
« bien 👍 »
★★★★★
« Allan Busi t'es au top, continue comme ça. formation géniale »
★★★★★
« cool, j'ai appris des trucs »
★★★★★
« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »
★★★★★
« la formation dev etait intense mais grave bien. merci Anthony Khelil »
★★★★★
« 😊👍 »
★★★★★
« bien 👍 »
★★★★★
« Allan Busi t'es au top, continue comme ça. formation géniale »
★★★★★
« cool, j'ai appris des trucs »
★★★★★
« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »
★★★★★
« la formation dev etait intense mais grave bien. merci Anthony Khelil »
★★★★★
« 😊👍 »
★★★★★
« bien 👍 »
★★★★★
« Allan Busi t'es au top, continue comme ça. formation géniale »
Our method
Training quality, guaranteed at every step
Before, during, after: we frame the brief, introduce the trainer, tailor the content and measure impact. You stay in control from kickoff to wrap-up.
You meet the trainer beforehand
30-minute video call between you and the selected trainer to validate the fit, adjust content and clear any final doubts.
- Live briefing on goals and team context.
- Veto right — we swap the trainer for free if needed.
Content tailored to your context
No recycled slides. The syllabus is reworked from your real cases: tools, constraints, vocabulary, ongoing projects.
- Hands-on cases drawn from your stack and projects.
- Program co-written then validated by your team.
Continuous quality follow-up
Live evaluations, 30/90/180-day check-ins and a consolidation plan. If the impact misses the mark, we rework it.
- NPS, knowledge quizzes and skills self-assessment.
- Satisfaction guarantee: fully satisfied or free rework.
A simple promise: you don't pay to discover the trainer on day one. Everything is validated upfront, by you.
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