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.
1 seat held for the next session
30:00Held for another
Request a call back and an advisor reaches you within 24 business hours, Monday to Saturday.
Trusted by — schools, companies and industrial groups
Every program built with a dedicated engineer
Learning objectives
- Master advanced mocking techniques for professional, certifiable unit tests
- Develop realistic mocks for APIs and external services in enterprise contexts
- Implement mocking for databases and complex modules with TypeScript
- Optimize test suites for maximum coverage and high performance
- Design mocking strategies integrated into CI/CD for secure deployments
- Acquire skills in spying and stubbing for effective debugging
- Deploy scalable mocked tests in professional projects
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 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.
Program
Module 1Advanced Mocking Fundamentals: Spies, Stubs, and Fakes with Jest/Vitest (Tools, Configurations, Real Cases)
Dive into advanced mocking techniques by installing Jest and Vitest on a professional TypeScript project, create spies to monitor complex function calls, develop stubs to simulate unpredictable behaviors, create fakes for external dependencies, apply these tools to real enterprise cases like user authentication, and conclude with practical exercises including personalized code review to solidify skills in reliable isolated testing.
Module 2Mocking APIs and External Services: Realistic Simulations (MSW, nock, axios-mock-adapter)
Simulate REST and GraphQL APIs with MSW for dynamic and conditional responses, integrate nock to intercept HTTP requests in Node.js, configure axios-mock-adapter on real front-end projects, test network error and timeout scenarios, develop persistent mocks for integration chains, analyze enterprise cases like secure payments, and produce production-ready testable deliverables with a focus on external service robustness.
Module 3Mocking Databases and Modules: TypeORM/Prisma Integration (Persistent Mocks, Seeding)
Create advanced mocks for TypeORM and Prisma by simulating complex SQL queries, implement mocked seeding for realistic datasets, manage relationships and transactions with custom factories, integrate Redis or MongoDB mocks for caches and NoSQL, apply to a red-thread enterprise project involving microservices, debug common mock leaks, and generate coverage reports to validate perfect unit test isolation.
Module 4Mocking Best Practices and CI/CD: Performance Optimization (Coverage, GitHub Actions, fastify)
Optimize mocked test suites for ultra-fast execution with advanced patterns, integrate mocking into GitHub Actions and Jenkins for smooth CI/CD pipelines, analyze coverage with Istanbul and configure professional thresholds, address anti-patterns like excessive global mocks, deploy on a scalable enterprise case, produce a personalized optimization plan, and conclude with a quiz session and presentation to certify new advanced testing skills.
Evaluation method
- Certifying multiple-choice quiz to validate learning outcomes at the end of the training
- Continuous assessment through practical exercises and a red-thread project
- Individual presentation of mocking applied to an enterprise case
Learning method
- Sessions led by an active professional mocking expert
- Practical exercises on real enterprise and open-source projects
- Progressive red-thread mocked project over 4 days
- Detailed course materials and permanent online resources
Methods, materials and delivery
The Mocking Training - Optimizing Advanced 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 Mocking Training - Optimizing 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 Mocking Training - Optimizing 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
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 Mocking Training - Optimizing Advanced Unit Tests training cost?+
The individual price is $5,145 (USD). The team / on-site group package is shown on the course page. A detailed quote is sent within one business day.
How long is the Mocking Training - Optimizing Advanced Unit Tests training?+
The training lasts 4 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 unit testing with Jest or Mocha, advanced JavaScript/TypeScript, professional development experience
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
This training across cities
Available on-site and remotely. Pick your city to see the local training center.
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