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 advanced Jest 2026 configurations tailored to large projects, implement custom matchers to validate complex objects, complete practical exercises on real APIs, configure presets for React and Node.js, test edge cases with integrated tools, produce a personalized setup as the day's final deliverable, while incorporating professional best practices to accelerate your development workflows.
Dive into Jest 2026's powerful mocking to simulate external dependencies, create automated stubs for third-party modules, apply these techniques to real e-commerce application cases, manage timers and asynchronous fetch calls with precision, analyze code coverage via interactive reports, conduct collaborative hands-on exercises in pairs, export reusable mock factories as deliverables, thereby strengthening your skills in high-performance isolated testing.
Explore Jest 2026's intelligent snapshots for validating dynamic UIs, integrate asynchronous tests with advanced async/await and Promises, test real React components with emotion and styled-components, automate snapshot updates in CI/CD via GitHub Actions, resolve flaky tests using retry strategies, produce a unified coverage dashboard, apply everything to a simulated enterprise project, generating production-ready deliverables.
Optimize Jest 2026 performance in parallel and with sharding for massive suites, integrate with Jenkins or GitLab CI pipelines, benchmark speed gains on real monorepos, configure intelligent watchers for advanced TDD, manage global errors and custom hooks, deploy a comprehensive end-to-end testing strategy, evaluate your skills via a capstone project, obtain professional competency certificates, with support for immediate enterprise implementation.
The Training Jest 2026 - Mastering High-Performance 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 2026 - Mastering High-Performance 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 2026 - Mastering High-Performance 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.
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Robotique & IndustrieIndustry-certified
Robotique & IndustrieIndustry-certified
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Développement WebIndustry-certified
Développement WebIndustry-certified
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Tests LogicielsIndustry-certified
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Tests AutomatisésIndustry-certified
Tests AutomatisésIndustry-certified
Tests AutomatisésIndustry-certified
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Tests AutomatisésIndustry-certified30 minutes with a learning advisor. No commitment. No sales pitch dressed up as a demo.