Training Jest - Advanced Effective JavaScript Unit Tests

$3,465

  • 3 days
  • Onsite
  • 10 people max.
Ref: KMO373
10 people max.
$3,465
In-company rate: from $6,290 for the whole team
On-site and certification exam on quote
3 days
Onsite

Don't let this gap widen

Why this program matters

  • 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.

Célian Lebacle, Learni trainer · Web & mobile expert
Célian Lebacle

Learni trainer · Web & mobile expert

73%productivity gap
×3cost of inaction
Flag of the United StatesBuilt for US teams
Payment by wire transferEnhanced confidentialityPerfect for companies with 50 to 500 employeesScheduling to fit any time zone

Trusted by — schools, companies and industrial groups

40,842 programs · 25 countries

  • Aptar
  • ArcelorMittal
  • Equans
  • EDF
  • Ubisoft
  • Microsoft

Every program built with a dedicated engineer

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Companies: Aptar, ArcelorMittal, Equans, EDF, Ubisoft and Microsoft.

Jest training objectives

  • Configure Jest in Node.js and React projects
  • Write advanced unit tests with custom matchers
  • Master mocks, spies, and API simulations
  • Optimize coverage and snapshots for robustness
  • Integrate Jest into CI/CD for reliable deployments
  • Debug test suites and refactor testable code

Jest curriculum: 3 modules over 3 days

Module 1 : Day 1: Jest Installation and Advanced Unit Tests (Matchers, Async, Promises)

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.

Module 2 : Day 2: Mocks, Spies, and React Component Tests (jest.mock, Enzyme, RTL)

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.

Module 3 : Day 3: Optimization, CI/CD, and Debugging (Coverage, Performance, GitHub Actions)

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.

How Jest skills are assessed

  • Daily interactive quizzes, graded practical exercises, final Qualiopi-certified project.

How the Jest course is taught

  • Pedagogy 30% theory / 70% practice, pair workshops, individualized feedback.

Jest training: access and practical arrangements

The Training Jest - Advanced Effective JavaScript Unit Tests 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 Training Jest - Advanced Effective JavaScript 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 - Advanced Effective JavaScript 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

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.

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.

Our method

How Learni guarantees the quality of your Jest training

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.

A child walking to school with a backpack
Our social commitment

A school kit donated to a child for every training booked

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
Enroll and offer a kit
FAQ

Jest: frequently asked questions

Which tools are used in Jest training?+
Hands-on work runs on matchers, async, promises, jest.mock, enzyme and RTL. Those tools come from the Jest program itself, delivered on site over 3 days, so participants practise on the stack they will use at work.
What can participants do after Jest training?+
They can configure Jest in Node.js and React projects, write advanced unit tests with custom matchers and master mocks, spies, and API simulations. Those are the stated objectives of the Jest program at Intermediate level, checked by the end-of-session assessment.
What does the Jest program cover, day by day?+
Day 1: Day 1: Jest Installation and Advanced Unit Tests (Matchers, Async, Promises). Day 2: Day 2: Mocks, Spies, and React Component Tests (jest.mock, Enzyme, RTL). Day 3: Day 3: Optimization, CI/CD, and Debugging (Coverage, Performance, GitHub Actions). The Jest program runs over 3 days, delivered on site.
How is Jest training assessed?+
Assessment relies on daily interactive quizzes, graded practical exercises, final Qualiopi-certified project. Learni issues a completion certificate together with the individual assessment report at the end of the Jest program, which an L&D team can file as evidence.
How much does Jest training cost per participant?+
Jest training costs $3,465 per participant. For an in-company team, the flat rate starts at $6,290 for the whole group, up to 8 people. The detailed quote, sent within one business day, adjusts the amount to the format and how far the syllabus is tailored to your team.
How long does Jest training take?+
3 days, available live online (US time zones) or on-site at your offices. Half-day tracks spread over several weeks are possible so the team stays operational.
Who pays for Jest training?+
Most US teams pay directly through their company L&D or training budget. Learni invoices in US dollars and accepts bank transfer (ACH/wire) or card, with volume pricing for teams. A purchase order is welcome.
What do participants need to know before Jest training?+
Mastery of JavaScript ES6+, web development experience, basics of unit testing.
Is a certificate issued after Jest training?+
Yes. A Learni completion certificate is issued, along with the individual evaluation report. Learni is a certified training provider and prepares for third-party certifications, but does not award them itself.
Does Learni provide the equipment for Jest training?+
No. A computer and a stable internet connection are required for each participant. Learni provides the learning platform, the trainer and all course materials.
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