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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 mastering Jest, 40% of bugs go unnoticed in production, wasting 20h/week on manual debugging according to Stack Overflow.
Your JS apps risk client crashes, 15% revenue loss for a failing e-commerce site, teams blocked by slow manual tests x10.
Avoid costly recalls like Uber's 500k€ untested bug, developer frustration, and exploded project deadlines by 30%.
With Jest, secure 90% of your code from day 1, gain peace of mind, and accelerate your releases.
The Training Jest - Effectively Test Your JS Apps in 3 Days 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 - Effectively Test Your JS Apps in 3 Days 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 - Effectively Test Your JS Apps in 3 Days 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.
Discover Jest by installing the tool via npm in a Node.js or React project, configure jest.config.js to match your needs, write your first unit tests on simple functions with expect and toBe, move to concrete exercises on JS components, generate coverage reports to visualize your progress, all while debugging live for total immersion and motivation.
Dive into mocks with jest.fn and jest.mock to isolate your tests, capture snapshots to validate React UI effortlessly, test promises and async/await on simulated APIs, refine with toMatchObject and beforeEach, apply to a real e-commerce app case, produce testable deliverables that boost your confidence and immediate productivity.
Integrate Jest with GitHub Actions for automated tests in pipelines, optimize speed with --watch and parallelism, analyze coverage to 80% minimum on a full project, apply best practices like describe/it nesting, finalize a reusable test portfolio, leave with deploy-ready scripts that transform your developments into assured success.
Target audience
JavaScript developers, frontend and backend engineers, to upskill in automated testing.
Prerequisites
JavaScript ES6+ basics, Node.js environment installed, npm/yarn knowledge.
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