Training Testing Library - Effectively Test React Apps

$5,775

  • 5 days
  • Onsite
  • 10 people max.
Ref: CHQ763
10 people max.
$5,775
In-company rate: from $10,395 for the whole team
On-site and certification exam on quote
5 days
Onsite

Don't let this gap widen

Why this program matters

  • Without Testing Library mastery, 68% of React bugs reach production, costing an average of 15 000€ per major incident according to Gartner.

  • Teams without reliable tests lose 50% of their time on post-release debugging, delaying releases and exposing the company to e-commerce revenue losses of up to 25%.

  • In 2024, 82% of DevOps recruiters reject resumes without modern testing expertise, threatening your career transition or promotion.

  • Every sprint without TDD widens the competitive gap: invest now for robust and scalable apps.

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

41,124 programs · 25 countries

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

Every program built with a dedicated engineer

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

Testing Library training objectives

  • Master Testing Library for professional unit tests in enterprise settings
  • Develop realistic tests simulating user interactions
  • Implement precise assertions on the DOM rendered by React
  • Optimize integration tests with Mock Service Worker
  • Design maintainable and certifiable test suites
  • Deploy TDD practices adapted to complex React projects
  • Acquire skills in debugging and coverage for agile teams

Program

Testing Library curriculum: 5 modules over 5 days

Module 1 : Testing Library Fundamentals: Installation and User-Centered Queries (React, Jest, Setup)

Complete installation of Testing Library in an existing React project, configuration with Jest and React Testing Library for a professional environment, exploration of queries byRole, byLabelText, and byText to target elements like a real user, practical exercises on simple components with render and screen, writing the first user-friendly tests, analysis of best practices to avoid fragile tests, production of an initial coverage report.

Module 2 : Advanced Interactions in Testing Library: Events and Forms (fireEvent, userEvent, Validation)

Simulation of realistic interactions with userEvent for clicks, input, and navigation, handling React forms with dynamic validation, testing focus management and accessibility via Testing Library, concrete cases on custom hooks and conditional components, interactive debugging of test failures, optimization of matchers for precise assertions on states and props, delivery of a robust, reusable enterprise form test suite.

Module 3 : State Management and Mocks in Testing Library: Context, Redux, API Mocks (MSW, vi.mock)

Mocking external APIs with Mock Service Worker for isolated and reliable tests, integration of Testing Library with React Context and Redux for complex states, asynchronous tests with waitFor and findBy, exercises on real dashboards with simulated data, resolution of common race conditions, measurement of coverage and refactoring to 90%+, creation of a red thread project with professional certifiable mocks.

Module 4 : Integration Tests in Testing Library: Routing and Portals (React Router, Portals, Custom Render)

Extension of Testing Library to test routes with MemoryRouter, management of portals and modals via within and custom queries, lightweight end-to-end tests on multi-component flows, use of data-testid for enterprise-specific cases, performance testing with act and cleanup, collaborative workshops on real bugs, production of internal guidelines for agile development teams.

Module 5 : Optimization and CI/CD in Testing Library: TDD, Coverage, Deployment (Playwright, GitHub Actions)

Adoption of TDD with Testing Library for faster and safer development, configuration of coverage thresholds and SonarQube reports, integration into CI/CD pipelines with GitHub Actions or Jenkins, migration of legacy Jest tests to modern Testing Library, pair-programming code review on the red thread project, certification of skills via MCQ and defense, extended access to resources for immediate enterprise application.

How Testing Library skills are assessed

  • Certifying MCQ to validate acquired knowledge at the end of the training
  • Continuous evaluation via practical exercises and coverage metrics
  • Defense of the red thread project with test review by the trainer

How the Testing Library course is taught

  • Courses led by an active Testing Library expert trainer
  • Practical exercises on real and complex enterprise React cases
  • Progressive red thread project integrating all Testing Library concepts
  • Complete course materials, templates, and videos provided to each participant

Testing Library training: access and practical arrangements

The Training Testing Library - Effectively Test React Apps 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 Testing Library - Effectively Test React Apps 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 Testing Library - Effectively Test React Apps 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 Testing Library 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

Testing Library: frequently asked questions

Which tools are used in Testing Library training?+
Hands-on work runs on react, jest, setup, fireEvent, userEvent and validation. Those tools come from the Testing Library program itself, delivered on site over 5 days, so participants practise on the stack they will use at work.
What can participants do after Testing Library training?+
They can master Testing Library for professional unit tests in enterprise settings, develop realistic tests simulating user interactions and implement precise assertions on the DOM rendered by React. Those are the stated objectives of the Testing Library program at Intermediate level, checked by the end-of-session assessment.
What does the Testing Library program cover, day by day?+
Day 1: Testing Library Fundamentals: Installation and User-Centered Queries (React, Jest, Setup). Day 2: Advanced Interactions in Testing Library: Events and Forms (fireEvent, userEvent, Validation). Day 3: State Management and Mocks in Testing Library: Context, Redux, API Mocks (MSW, vi.mock). Day 4: Integration Tests in Testing Library: Routing and Portals (React Router, Portals, Custom Render). Day 5: Optimization and CI/CD in Testing Library: TDD, Coverage, Deployment (Playwright, GitHub Actions). The Testing Library program runs over 5 days, delivered on site.
How is Testing Library training assessed?+
Assessment relies on certifying MCQ to validate acquired knowledge at the end of the training, continuous evaluation via practical exercises and coverage metrics and defense of the red thread project with test review by the trainer. Learni issues a completion certificate together with the individual assessment report at the end of the Testing Library program, which an L&D team can file as evidence.
How much does Testing Library training cost per participant?+
Testing Library training costs $5,775 per participant. For an in-company team, the flat rate starts at $10,395 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 Testing Library training take?+
5 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 Testing Library 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 Testing Library training?+
Mastery of React, JavaScript ES6+, build tools like Vite or Create React App.
Is a certificate issued after Testing Library 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 Testing Library 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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