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Founded by passionate advocates of learning and innovation, Learni set out to make professional training accessible to everyone, everywhere in the world. Our team works in the largest cities such as Paris, Lyon, Marseille, and internationally, to support talents and organizations in their skills development.
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30 free minutes with a training advisor — no commitment.
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Don't let this gap widen
Without mastered Jest, 70% of JavaScript bugs go unnoticed, inflating maintenance costs by 40% according to Stack Overflow studies.
Deploy fragile code, suffer critical outages impacting 25% of e-commerce revenue, lose 30 hours/week on urgent manual debugging.
Demotivated teams facing slow tests, recurring project delays.
Our intermediate Jest training stops these risks: reliable tests in minutes, seamless CI/CD, robust apps with zero downtime.
Invest 21 hours, save thousands of euros and weeks of chaos.
The Training Jest - Advanced Effective JavaScript Unit Tests training is delivered in-person or remotely (blended-learning, e-learning, virtual classroom, remote in-person). At Learni, a Qualiopi-certified training organization, each program is designed to maximize skills acquisition, regardless of the training mode chosen.
The trainer alternates between demonstrative, interrogative, and active methods (through practical exercises and/or real-world scenarios). This pedagogical approach ensures concrete and directly applicable learning in the workplace.
To ensure the quality of the Training Jest - Advanced Effective JavaScript Unit Tests training, Learni provides the following teaching resources:
For in-house training at a location external to Learni, the client ensures and commits to having all necessary teaching materials (IT equipment, internet connection...) for the proper conduct of the training action in accordance with the prerequisites indicated in the communicated training program.
The assessment of skills acquired during the Training Jest - Advanced Effective JavaScript Unit Tests training is carried out through:
Learni is committed to the accessibility of its professional training programs. All our training programs are accessible to people with disabilities. Our teams are available to adapt teaching methods to your specific needs. Do not hesitate to contact us for any accommodation request.
Learni training programs are available for inter-company and intra-company settings, both in-person and remote. Registration is possible up to 48 business hours before the start of training. Our programs are eligible for OPCO, Pôle emploi, and FNE-Formation funding. Contact us to discuss your training project and funding possibilities.
Install Jest in your existing project, configure Babel and ts-jest for a smooth setup, write your first tests with advanced expect and custom matchers, test async functions via async/await, hands-on exercises on real Node.js cases, generate immediate coverage reports, experience the speed that boosts your productivity from the morning.
Dive into jest.mock to simulate external modules, create spies with jest.fn to track calls, test React components with React Testing Library, integrate custom hooks and context, practical workshops on a real e-commerce app, generate smart snapshots, feel the power that secures your frontend code in a snap.
Analyze 90%+ coverage with strict thresholds, optimize parallel test speed, integrate Jest into GitHub Actions pipelines, debug with interactive watch mode, refactor legacy code to be testable, final project on a complete API, leave with a deliverable portfolio, ready to scale your tests in production tomorrow.
Target audience
JavaScript developers, frontend/backend engineers, quality managers upskilling in automated testing.
Prerequisites
Mastery of JavaScript ES6+, web development experience, basics of unit testing.
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