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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 Jest, 68% of JavaScript bugs escape manual reviews, costing 3h/week in urgent debugging according to Stack Overflow.
Your deployments crash in production, slowing CI/CD and frustrating users.
Imagine losing 40% productivity on trivial errors, while automated tests detect everything in seconds.
Junior teams deliver fragile code, impacting scalability.
Without mocks, tests are inaccurate, generating false positives.
Don't risk it anymore: 80% of top-tier devs use Jest for zero bugs in production.
The Training Jest - JavaScript Unit Tests in 1 Day 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 - JavaScript Unit Tests in 1 Day 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 - JavaScript Unit Tests in 1 Day 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.
Dive into Jest through a concrete project, install it with npm init and jest --init, write your first tests on pure functions with toBe, toEqual, move to async/await for simulated APIs, mock dependencies with jest.mock to isolate code, capture React snapshots for quick UI, analyze coverage with jest --coverage, and optimize with watch mode for smooth iterations, deliverable: project tested 100% covered.
Target audience
JavaScript frontend/backend developers, quality engineers, upskilling on automated testing.
Prerequisites
JavaScript ES6+ basics, npm/yarn, Node.js environment.
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