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Training Mockito - Mastering Advanced Java Unit Tests

Course created on July 27, 2026Updated on October 5, 2026

On quote

4 days
Onsite
10 people max.

Request a quote See the program

Ref: KPS636

10 people max.

On quote

In-company rate: on quote

On-site and certification exam on quote

4 days

Onsite

Don't let this gap widen

Why this program matters

Without mastering Mockito, 68% of Java bugs end up in production, costing an average of 15 000€ per critical incident according to Gartner.
Teams spend 40% more time debugging, delaying releases by 2 weeks.
In 2024, 75% of Java job postings require advanced mocking skills, putting your career at risk of obsolescence.
Don't let fragile tests sabotage your projects: invest now for reliable, scalable applications.

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25,715 programs · 25 countries

Every program built with a dedicated engineer

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

Learning objectives

Master Mockito annotations for professional mocks in enterprise settings
Develop robust unit tests with spies and advanced stubbing
Implement precise interaction verifications in complex contexts
Design isolated tests for certified Spring Boot applications
Optimize TDD skills with Mockito for reliable deliverables
Deploy maintainable and scalable test suites in professional training

Program

Module 1Mockito Fundamentals: annotations and basic stubbing (JUnit, verify, when)

Dive into Mockito installation with Maven or Gradle, creating simple mocks to isolate dependencies, using @Mock and @InjectMocks annotations on real business cases, practical stubbing exercises to simulate API responses, call verifications with verify to validate interactions, producing a first complete unit test with coverage report, immediately enhancing your professional testing skills.

Module 2Advanced Mockito: spies and argument matchers (captors, any, eq)

Explore spies for partial mocking of real objects, advanced configuration with doReturn and doThrow to handle exceptions, argument capture with ArgumentCaptor on complex methods, integration of matchers like anyList or eq for flexibility, practical workshops on refactoring legacy code, testing business services with mocked databases, achieving more precise and maintainable test suites to boost enterprise quality.

Module 3Mockito Integration: Spring Boot and asynchronous tests (MockBean, @Async)

Integrate Mockito into Spring projects with @MockBean and @SpyBean for controllers and repositories, mocking asynchronous calls with CompletableFuture, handling timeouts and reactive streams, exercises on real microservices with Kafka or REST clients, simulating network errors for robustness, developing a red thread project connected to an external API, mastering isolated end-to-end tests that accelerate professional development cycles.

Module 4Mockito Best Practices: TDD and refactoring (BDDMockito, coverage)

Adopt TDD with BDDMockito for fluent given-when-then, refactoring fragile tests into data-driven tests, optimizing coverage with JaCoCo and SonarQube reports, case studies on common pitfalls like over-mocking, collaborative workshops for team code reviews, finalizing the red thread project with CI/CD deployment, leaving with certified advanced unit testing skills ready for the enterprise.

Evaluation method

Certified MCQ on advanced Mockito concepts
Assessment through practical exercises and code review
Project defense with coverage analysis

Learning method

Sessions led by an active Java expert
Hands-on exercises on authentic business cases
Evolving red thread project over 4 days
Detailed course materials and online resources

Methods, materials and delivery

The Training Mockito - Mastering Advanced Java 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 Mockito - Mastering Advanced Java 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 Mockito - Mastering Advanced Java 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

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.

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

Frequently asked questions

Which tools are used in Mockito training?+

Hands-on work runs on JUnit, verify, when, captors, any and eq. Those tools come from the Mockito program itself, delivered on site over 4 days, so participants practise on the stack they will use at work.

What can participants do after Mockito training?+

They can master Mockito annotations for professional mocks in enterprise settings, develop robust unit tests with spies and advanced stubbing and implement precise interaction verifications in complex contexts. Those are the stated objectives of the Mockito program at Intermediate level, checked by the end-of-session assessment.

What does the Mockito program cover, day by day?+

Day 1: Mockito Fundamentals: annotations and basic stubbing (JUnit, verify, when). Day 2: Advanced Mockito: spies and argument matchers (captors, any, eq). Day 3: Mockito Integration: Spring Boot and asynchronous tests (MockBean, @Async). Day 4: Mockito Best Practices: TDD and refactoring (BDDMockito, coverage). The Mockito program runs over 4 days, delivered on site.

How is Mockito training assessed?+

Assessment relies on certified MCQ on advanced Mockito concepts, assessment through practical exercises and code review and project defense with coverage analysis. Learni issues a completion certificate together with the individual assessment report at the end of the Mockito program, which an L&D team can file as evidence.

How much does Mockito training cost per participant?+

Mockito training is priced on quote. The amount depends on headcount, format and how far the syllabus is tailored to your team. A detailed quote is sent within one business day, and team pricing covers the whole group from the second participant.

How long does Mockito training take?+

4 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 Mockito 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 Mockito training?+

Proficiency in Java 8+ and basics of JUnit 5 for effective unit testing.

Is a certificate issued after Mockito 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.

Your professional training, anywhere