🎁Azure · AWS · Google — 1 free certification per learner, up to $400.Get the offer →
← Back

Training Jest - Mastering Advanced Unit Tests

Ref: YGR689
10 people max.
4400€ HT / per person
−15% from 2 people−30% from 3 people−50% from 5 people
Pay in 3 installments · +$170/day onsite · +$500 with certification exam
4 journées
distanciel

Share in 2 clicks

EquansAptarArcelorMittalUbisoftINSEECLa PlateformeCESIEFREIEPSIINGETISMy Digital SchoolYnovEquansAptarArcelorMittalUbisoftINSEECLa PlateformeCESIEFREIEPSIINGETISMy Digital SchoolYnov

Learning objectives

  • Master advanced mocks and snapshots in Jest for robust enterprise tests
  • Develop high-performance test suites with optimal code coverage
  • Configure Jest in CI/CD pipelines for certified continuous deployments
  • Implement complex unit tests for professional React applications
  • Optimize Jest performance on large projects with custom assertions
  • Acquire certifiable skills in automated testing to boost team productivity

The Learni story

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

Why this program matters

  • 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.

Allan Busi
Allan Busi

Learni Trainer · Expert

73%productivity gap
×3cost of inaction

Program

Module 1Advanced Jest: Mocks, Spies, and Stubs (native tools, real exercises, tested deliverables)

Dive into advanced mocking techniques with jest.fn(), jest.spyOn(), and jest.mock(), applied to complex Node.js modules. Simulate asynchronous external APIs to isolate critical units, perform practical exercises on real business cases like e-commerce, generate detailed mock reports, integrate stubs for third-party dependencies, consolidate skills via supervised hands-on exercises, produce suites ready for CI/CD.

Module 2Advanced Jest: Snapshots and Code Coverage (custom matchers, thresholds, HTML reports)

Explore snapshots to validate React UI renders, configure jest --updateSnapshot for smooth evolutions, implement coverage with --coverage and strict 90% thresholds, analyze Istanbul reports for weak areas, develop custom matchers via expect.extend(), test complex components with RTL, chain exercises on legacy code, generate actionable dashboards, optimize for production environments, validate via group peer reviews.

Module 3Advanced Jest: CI/CD Integration and Performance (GitHub Actions, parallelism, caching)

Integrate Jest into GitHub Actions, Jenkins, or GitLab CI pipelines, enable watch mode with --watchAll for iterative development, optimize execution via --runInBand or parallelism, implement npm caching for fast builds, test on Yarn Workspaces monorepos, simulate memory leaks with heap snapshots, develop custom npm test scripts, analyze bottlenecks with --logHeapUsage, produce scalable configs for enterprise teams, debug via live hands-on exercises.

Module 4Advanced Jest: Custom Tests and Best Practices (plugins, migrations, certifying project)

Create custom Jest plugins for business needs, migrate from Mocha/Jasmine to Jest without downtime, apply best practices for advanced TDD/BDD, integrate with Detox for hybrid apps, develop final project on a complete React e-commerce app including 200+ tests with 95% coverage, receive individual expert feedback, export artifacts for portfolio, prepare for Qualiopi certification, consolidate via in-depth Q&A, plan enterprise implementation.

Evaluation method

  • Daily interactive quizzes on advanced Jest concepts
  • Continuous evaluation of hands-on exercises via pair-programming code reviews
  • Final capstone project with presentation and certification awarded

Learning method

  • Hands-on methods with 70% time on real practical exercises
  • Concrete projects inspired by Fortune 500 company cases
  • Individualized pedagogical support in small groups of max 10
  • Post-training resources: videos, Git repo, dedicated forum for 6 months

Methods, materials and delivery

The Training Jest - Mastering Advanced 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.

Equipment required

For the smooth delivery of the Training Jest - Mastering Advanced Unit Tests 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 Training Jest - Mastering Advanced Unit Tests 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

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.

Verified reviews

What our learners

4.9 · +100 verified reviews
★★★★★

« cool, j'ai appris des trucs »

TomFormation AWS — Cloud Practitioner
★★★★★

« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »

Eva CarpentierFormation LLM en Entreprise — Claude, ChatGPT, Mistral
★★★★★

« la formation dev etait intense mais grave bien. merci Anthony Khelil »

NolanDWWM - Développeur Web et Web Mobile
★★★★★

« 😊👍 »

AmbreDWWM - Développement Web & Mobile React
★★★★★

« bien 👍 »

Léo BlanchardFormation AWS — DevOps Engineer Professional
★★★★★

« Allan Busi t'es au top, continue comme ça. formation géniale »

MargotFormation Claude & ChatGPT — Comparatif et Cas d'Usage
★★★★★

« cool, j'ai appris des trucs »

TomFormation AWS — Cloud Practitioner
★★★★★

« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »

Eva CarpentierFormation LLM en Entreprise — Claude, ChatGPT, Mistral
★★★★★

« la formation dev etait intense mais grave bien. merci Anthony Khelil »

NolanDWWM - Développeur Web et Web Mobile
★★★★★

« 😊👍 »

AmbreDWWM - Développement Web & Mobile React
★★★★★

« bien 👍 »

Léo BlanchardFormation AWS — DevOps Engineer Professional
★★★★★

« Allan Busi t'es au top, continue comme ça. formation géniale »

MargotFormation Claude & ChatGPT — Comparatif et Cas d'Usage
★★★★★

« cool, j'ai appris des trucs »

TomFormation AWS — Cloud Practitioner
★★★★★

« j'etais perdu au debut mais Ramy Saharaoui m'a pas laché, il a pris le temps. merci vraiment »

Eva CarpentierFormation LLM en Entreprise — Claude, ChatGPT, Mistral
★★★★★

« la formation dev etait intense mais grave bien. merci Anthony Khelil »

NolanDWWM - Développeur Web et Web Mobile
★★★★★

« 😊👍 »

AmbreDWWM - Développement Web & Mobile React
★★★★★

« bien 👍 »

Léo BlanchardFormation AWS — DevOps Engineer Professional
★★★★★

« Allan Busi t'es au top, continue comme ça. formation géniale »

MargotFormation Claude & ChatGPT — Comparatif et Cas d'Usage
Read all reviews
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.

Step 1

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.
Step 2

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.
Step 3

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.
Step 4

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.

Your professional training, anywhere

Let's build
your next
program.

30 minutes with a learning advisor. No commitment. No sales pitch dressed up as a demo.

Reply within 24 h · Industry-certified · Corporate funding
WhatsApp