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.
1 seat held for the next session
30:00Held for another
Request a call back and an advisor reaches you within 24 business hours, Monday to Saturday.
Training: Mastering Testing Library for Effective Tests on React Applications
Trusted by — schools, companies and industrial groups
Every program built with a dedicated engineer
Learning objectives
- Understand the role and benefits of Testing Library
- Write accessible and robust tests for React components
- Leverage the best practices of Testing Library
- Master techniques for organizing and maintaining test suites
- Detect anti-patterns and avoid them in your tests
- Automate test execution in a CI/CD pipeline
Our social commitment
A school kit donated to a child for every training
To fight inequalities in access to education, Learni donates a complete school kit to a child in need for every training booked. You build your skills, a child heads back to school.
- Backpack, notebooks and essential supplies
- Distributed through our partner charities
- Included, at no extra cost to you
The Learni story
Founded by engineers and learning experts, Learni's mission is to make high-impact tech training accessible to teams everywhere. We work remotely with organizations across the US and Canada, in your time zone, to help teams upskill fast.
Don't let this gap widen
Why this program matters
Without mastery of Testing Library, your React tests become time-consuming and unreliable, exposing your applications to bugs that slip into production.
65 % of frontend incidents at SMEs stem from inadequate tests, costing an average of 4 500 € per malfunction and 2 weeks of debug per developer.
Every month without these skills, a team loses 25 % of productivity, threatening project deadlines and the company's competitiveness.
Your career stagnates: without expertise in effective testing, you move from junior to obsolete in the eyes of demanding recruiters.
Program
Module 1Fundamentals of Unit Testing with Testing Library
Introduction to testing: Why test? Differences between Jest and Testing Library. Setting up a React project with Testing Library. Getting started with the Testing Library philosophy: test like a user. First tests – rendering, finding elements, simple interactions. Best practices for accessing elements (Role, Text, Placeholder, etc.). Introduction to event handling (onClick, onChange) in tests.
Module 2Advanced Tests and Handling Complex Cases
Tests on forms, input management, UX validation. Asynchronous tests: waiting for updates, handling mocked fetch/API (MSW). Testing components with complex logic (context, hooks, providers). Advanced use of queries (getBy, findBy, queryBy, etc.). Organizing test suites, refactoring, managing duplication. Managing side-effects, cleaning the DOM between tests.
Module 3Quality, Maintenance, and Integration into the Development Process
Making tests robust against changes. Long-term maintenance strategies: structuring files, factoring helpers/mocks. Detecting and avoiding common anti-patterns (over-mocking, fragile tests…). Measuring test coverage, reporting tools. Continuous integration: automate execution with GitHub Actions/GitLab. Feedback from experience and case studies. Practical workshop: audit, writing, and guided refactoring of tests on an existing React project.
Evaluation method
- Multiple-choice quiz to validate learning outcomes at the end of the course
- Guided practical exercises for each module
- Case study to complete and oral presentation
Learning method
- Thematic presentations by a Testing Library expert
- Practical exercises on example React applications
- Q&A sessions and collective code analysis
- Structured course materials and exercises to redo at home
Methods, materials and delivery
The Training: Mastering Testing Library for Effective Tests on React Applications program is delivered onsite or remote (blended-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: Mastering Testing Library for Effective Tests on React Applications 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: Mastering Testing Library for Effective Tests on React Applications 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
Registration is possible up to 48 business hours before the start of training. All our programs are built for corporate L&D budgets and delivered onsite or remotely.
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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FAQ
Frequently asked questions
How much does the Training: Mastering Testing Library for Effective Tests on React Applications training cost?+
The price is $2,625 (USD) per participant. A detailed quote is sent within one business day.
How long is the Training: Mastering Testing Library for Effective Tests on React Applications training?+
The training lasts 2 journées, available live online (US time zones) or on-site at your offices.
How is this training paid for?+
Most US teams pay directly through their company (L&D or training budget). We invoice in US dollars and accept bank transfer (ACH/wire) or card, with volume pricing for teams. A purchase order is welcome.
Are there any prerequisites?+
Basic knowledge of React and JavaScript
Is a certificate delivered at the end?+
Yes. A Learni completion certificate is issued, along with the individual evaluation report.
Does Learni provide the equipment?+
No. A computer and stable internet connection are required for the participant. Learni provides the educational platform, the trainer and all course materials.
On-site & remote
This training across cities
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