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.
Describe your need, get a tailored program and a pre-filled quote in 3 min. A 100% free call with an advisor.
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
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.
Discover rapid Jest installation in a Node.js or React project, configure Babel and ES6 modules for optimal compatibility, explore CLI and package.json options, run your first tests with basic matchers, apply practical exercises on a real project, and obtain a ready-to-use environment for robust, scalable professional tests by the end of the day.
Dive into Jest mocks to simulate complex API calls, implement spies to monitor functions, test modular interactions with jest.fn(), tackle concrete cases like mocked fetch requests, develop isolated test suites, analyze results in real-time during collaborative exercises, and produce testable deliverables to boost your code isolation skills.
Master async tests with jest.fn().mockResolvedValue, handle timeouts and asynchronous errors, capture snapshots to validate React UI renders, apply patterns for custom hooks, complete labs on real components, test loading scenarios, generate visual reports, and consolidate your skills with a practical challenge on a full app.
Configure jest --coverage to measure and improve code coverage to 90%, optimize run times with --watch and parallelism, integrate Jest with GitHub Actions or Jenkins, test real CI/CD workflows, analyze bottlenecks, produce coverage badges, deploy shared configurations, and validate everything through a team project for immediate professional automation.
Apply Jest to a complete React/Node.js project with advanced mocks, snapshots, and CI, review common errors and test refactoring, integrate tools like Jest DOM, share group feedback on live challenges, produce a certifying portfolio, receive personalized advice for your enterprise, and leave with reusable templates and post-training support.
The Training Jest - Mastering Advanced 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.
For the smooth delivery of the Training Jest - Mastering Advanced Unit Tests program, the following equipment is required:
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.
Assessment of skills acquired during the Training Jest - Mastering Advanced Unit Tests program is performed through:
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.
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.
« 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 »
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.
Each trainer is validated on three criteria: hands-on field expertise, proven pedagogy and alignment with your industry.
30-minute video call between you and the selected trainer to validate the fit, adjust content and clear any final doubts.
No recycled slides. The syllabus is reworked from your real cases: tools, constraints, vocabulary, ongoing projects.
Live evaluations, 30/90/180-day check-ins and a consolidation plan. If the impact misses the mark, we rework it.
A simple promise: you don't pay to discover the trainer on day one. Everything is validated upfront, by you.
Robotique & IndustrieIndustry-certified
Robotique & IndustrieIndustry-certified
Robotique & IndustrieIndustry-certified
Robotique & IndustrieIndustry-certified
Robotique & IndustrieIndustry-certified
Robotique & IndustrieIndustry-certified
Développement WebIndustry-certified
Développement WebIndustry-certified
Développement WebIndustry-certified
Développement WebIndustry-certified
Développement WebIndustry-certified
Développement WebIndustry-certified
Tests LogicielsIndustry-certified
Tests LogicielsIndustry-certified
Tests LogicielsIndustry-certified
Tests LogicielsIndustry-certified
Tests LogicielsIndustry-certified
Tests LogicielsIndustry-certified
Tests AutomatisésIndustry-certified
Tests AutomatisésIndustry-certified
Tests AutomatisésIndustry-certified
Tests AutomatisésIndustry-certified
Tests AutomatisésIndustry-certified
Tests AutomatisésIndustry-certified30 minutes with a learning advisor. No commitment. No sales pitch dressed up as a demo.