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.
Trusted by — schools, companies and industrial groups
Learning objectives
- Configure Jest for complex projects
- Master advanced and custom matchers
- Implement effective mocks and spies
- Handle asynchronous tests and snapshots
- Optimize code coverage to 90%
- Integrate Jest into CI/CD pipelines
- Develop maintainable test suites
Our social commitment
A school kit donated to a child for every training
To fight inequalities in access to education, Learni donates a complete school kit to a child in need for every training booked. You build your skills, a child heads back to school.
- Backpack, notebooks and essential supplies
- Distributed through our partner charities
- Included, at no extra cost to you
The Learni story
Founded by engineers and learning experts, Learni's mission is to make high-impact tech training accessible to teams everywhere. We work remotely with organizations across the US and Canada, in your time zone, to help teams upskill fast.
Don't let this gap widen
Why this program matters
Without mastering Jest, 40% of bugs escape basic tests, costing 20h/week in urgent debugging according to Stack Overflow.
Projects delivered with 30% delays due to invisible regressions, customer satisfaction dropping 25% per Gartner.
Teams frustrated by slow and flaky tests, developer turnover +15%.
Investing 35h today avoids 500h of annual losses, secures your deployments, and boosts your career employability by 20%.
Don't let chaos test your patience.
Program
Module 1Day 1: Jest Configuration and Advanced Matchers (CLI tools, Jest.config.js, assertions)
Dive into Jest installation and custom configuration via CLI and jest.config.js, test immediately with advanced matchers like toMatchObject or toHaveLength, complete exercises on real-world JSON data validation cases, generate your first detailed test reports, alternating quick theory and intensive practice for immediate skill ramp-up.
Module 2Day 2: Powerful Mocks and Spies (jest.fn, jest.mock, API simulation)
Create manual mocks with jest.fn and automatic ones via jest.mock to simulate external APIs, spy on functions to verify calls and returns, apply to concrete cases like mocked HTTP fetch, generate mock snapshots for smooth maintenance, experience the thrill of isolated tests boosting your productivity from day one.
Module 3Day 3: Asynchronous Tests and Snapshots (async/await, Promise, toMatchSnapshot)
Master async tests with expect.assertions and resolvers, capture snapshots for React components or complex objects, handle async errors via try/catch, practice on real Node.js app scenarios, produce robust production-ready test suites, with a pedagogical flow that makes every exercise engaging and practical.
Module 4Day 4: Code Coverage and Optimization (jest --coverage, thresholds)
Analyze coverage with jest --coverage and enforce 90% thresholds, optimize slow tests via --watch and bail, integrate setup/teardown hooks, work on an open-source project to boost real coverage, receive live feedback for immediate gains, transform your tests into a strategic asset.
Module 5Day 5: Best Practices and Capstone Project (CI/CD, test refactoring)
Integrate Jest into GitHub Actions for smooth CI/CD, refactor an existing test suite for maintainability, develop a complete final project using all tools covered, present your deliverables and receive certification, end as a hero of reliable testing, ready to excel in your team.
Evaluation method
- Daily interactive quizzes
- Certified final project
- Personalized 360° feedback
Learning method
- 70% hands-on with real-world cases
- Pair exercises
- Lifetime resources included
Methods, materials and delivery
The Jest Training - Master Advanced JavaScript Unit Testing program is delivered onsite or remote (blended-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.
Equipment required
For the smooth delivery of the Jest Training - Master Advanced JavaScript Unit Testing program, the following equipment is required:
- Mac or PC computers, high-speed fiber internet, whiteboard or flipchart, projector or interactive touch screen (for remote sessions)
- Training environments installed on workstations or accessible online
- Course materials, hands-on exercises and complementary resources
- Post-training access to materials and educational resources
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.
* contact us for remote delivery feasibility** ratio varies depending on the program
Skills assessment methods
Assessment of skills acquired during the Jest Training - Master Advanced JavaScript Unit Testing program is performed through:
- During training: case studies, hands-on labs and professional scenarios
- End of training: self-assessment questionnaire and skills evaluation by the trainer
- After training: completion certificate detailing acquired skills
Program accessibility
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.
Enrollment terms and lead times
Registration is possible up to 48 business hours before the start of training. All our programs are built for corporate L&D budgets and delivered onsite or remotely.
Our method
Training quality, guaranteed at every step
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.
You meet the trainer beforehand
30-minute video call between you and the selected trainer to validate the fit, adjust content and clear any final doubts.
- Live briefing on goals and team context.
- Veto right — we swap the trainer for free if needed.
Content tailored to your context
No recycled slides. The syllabus is reworked from your real cases: tools, constraints, vocabulary, ongoing projects.
- Hands-on cases drawn from your stack and projects.
- Program co-written then validated by your team.
Continuous quality follow-up
Live evaluations, 30/90/180-day check-ins and a consolidation plan. If the impact misses the mark, we rework it.
- NPS, knowledge quizzes and skills self-assessment.
- Satisfaction guarantee: fully satisfied or free rework.
A simple promise: you don't pay to discover the trainer on day one. Everything is validated upfront, by you.
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FAQ
Frequently asked questions
How much does the Jest Training - Master Advanced JavaScript Unit Testing training cost?+
The individual price is $5,775, and the team / on-site price is $10,106 (USD). A detailed quote is sent within one business day.
How long is the Jest Training - Master Advanced JavaScript Unit Testing training?+
The training lasts 5 journées, available live online (US time zones) or on-site at your offices.
How is this training paid for?+
Most US teams pay directly through their company (L&D or training budget). We invoice in US dollars and accept bank transfer (ACH/wire) or card, with volume pricing for teams. A purchase order is welcome.
Are there any prerequisites?+
Mastery of JavaScript ES6+, experience with a basic testing framework like Mocha.
Is a certificate delivered at the end?+
Yes. A Learni completion certificate is issued, along with the individual evaluation report.
Does Learni provide the equipment?+
No. A computer and stable internet connection are required for the participant. Learni provides the educational platform, the trainer and all course materials.
On-site & remote
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