Unit testing services
Unit testing for individual functions, classes, modules, and components.
DeviQA provides unit testing services for frontend and backend code. Our engineers create, review, and maintain isolated tests for functions, classes, modules, and components, using mocks and stubs for external dependencies and integrating test execution into CI/CD pipelines. Since 2010, DeviQA has completed 500+ QA projects across more than 40 industries and delivered 600,000+ project man-days.
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Unit testing challenges addressed by DeviQA
DeviQA helps teams address missing unit test coverage, tightly coupled dependencies, slow or unstable tests, outdated test suites, and gaps in CI/CD test execution.
Unit testing services provided by DeviQA
DeviQA provides unit test design, development, review, maintenance, dependency isolation, test-driven development support, and coverage for legacy codebases.
Functional unit testing
We verify that individual functions, methods, classes, and modules produce the expected outputs and state changes for defined inputs and business rules.
Edge case and error-path testing
We test boundary values, empty or invalid inputs, exceptions, and failure paths to verify how individual units handle unexpected conditions.
Mocking and dependency isolation
We replace external services, databases, APIs, file systems, and other dependencies with mocks or stubs so individual units can be tested in isolation.
Test-driven development support
We support test-driven development (TDD) by defining unit tests before implementation and updating them as the code and requirements evolve.
Unit testing for legacy code
We create characterization tests around existing behavior and add unit coverage to high-risk legacy components before refactoring or modernization.
Abbott Laboratories is a global healthcare giant
90%
Test coverage
1.6k+
Test cases created
X18
Faster regression testing run
Compass is the first modern real estate platform
85%
Test coverage
2k+
Test cases created
2.5x
Faster regression testing run
Arklign is a dental practice platform
95%
Test coverage
5k+
Test cases created
3k+
Number of critical bugs logged
Tipalti is a payment automation platform
12
Years of cooperation
100%
Covered performance
2x
Faster regression testing time
Xola is a booking system for tours and attractions
90%
Test coverage
3.2k+
Automation test scripts created
1-2h
Time of regression
Experience the DeviQA difference
From initial consultation to full-scale QA implementation, we deliver results.
DeviQA’s AI advantage
At DeviQA, we use AI to make testing smarter and simpler. Our ecosystem is built to deliver faster, smarter, and more cost-efficient results — so your team can do more in less time.
DeviQA AI ecosystem
AI-powered IDE assistant
Reduces test script writing time
QA companion
Provides suggestions for test optimization and addresses gaps
Automated code review
Flags unused variables, improper loops, and other common errors
AI for API testing in Postman
Streamlines API test case creation and response validation
Features
Test case creation
Code review
Exploratory planning
Log analysis
without AI
6 hrs
3 hrs
2 hrs
2 hrs
with DeviQA AI
4 hrs (33% saved)
2 hrs (33% saved)
45 min (60% saved)
1 hr (50% saved)
Collaboration on your terms
Backed by 16 years of expertise, DeviQA offers three flexible models for unit testing services to fit your project’s needs, timeline, and budget.
Staff augmentation
Expand your team with skilled unit testing engineers – fast.
Advantages:
Flexible scaling up or down
No recruitment delays or overhead
Seamless collaboration with your developers
Best for:
Teams needing extra hands without long-term commitment.
Dedicated QA team
A full-time team focused solely on your product and goals.
Advantages:
Deep integration with your in-house team
Long-term engagement and knowledge retention
Full control over priorities and direction
Best for:
Companies scaling fast and needing a stable, expert QA team.
Project-based outsourcing
Hand off unit testing for a specific scope – we’ll own it end-to-end.
Advantages:
Clear deliverables and timelines
Zero management overhead
Ideal for one-off or fixed-scope projects
Best for:
Busy teams that want results without managing the process.
Why choose DeviQA for unit testing services?
Over 600,000 project man-days successfully delivered.
We take full accountability for our work.
A range of value-added services at no extra cost.
Free test trial. Try us before making any payment.
Our engineers are senior testers with strong autonomy and self-starting ability.
With a 96% retention rate, we offer stable teams, compared to the industry average of 80%.
Extensive testing lab with a wide range of environments, platforms, and devices.
Access to a technology community of over 4000 QA engineers and experts.
Build maintainable unit tests that support safer refactoring
DeviQA’s unit testing process
DeviQA follows a six-step unit testing process covering codebase analysis, strategy design, framework setup, test development, CI/CD integration, and ongoing maintenance.
Analyze the codebase and existing coverage
We review the application architecture, programming languages, frameworks, modules, dependencies, existing tests, coverage data, and business-critical logic.
Define the unit testing strategy
We define the target modules, coverage criteria, testing framework, test runner, dependency-isolation approach, responsibilities, schedule, and CI/CD requirements.
Configure the unit testing framework
We configure the testing framework, test runner, mocks, stubs, fixtures, and coverage reporting required for isolated and repeatable execution.
Develop and review unit tests
We create unit tests for business logic, expected behavior, boundary values, invalid inputs, exceptions, and failure paths. Each test is designed to verify one defined behavior.
Integrate unit tests into CI/CD
We configure unit tests to run automatically at defined CI/CD events, such as commits, pull requests, and builds, with results included in pipeline reporting.
Maintain and optimize the unit test suite
We update tests, mocks, and fixtures as the code changes, remove obsolete checks, investigate unstable tests, optimize execution time, and expand coverage where required.
Here’s what people are saying
about DeviQA
34 reviews
34 reviews
9 reviews
“It was so easy to integrate your people with us and we didn't have any problems.”
Janosch Greber
VP of engineering at RealTyme
“DeviQA has always brought us really high quality candidates for us to be able to seamlessly mesh into our team.”
Danny He
CEO and founder at Soapbox
“You guys have always been genuine, flexible and personable.”
Ryan Austin
CEO and founder at Cognota
“In fact, they have been a part of our success story, helping us grow from six workers 11 years ago to about 1200 workers now.”
Raanan Tauber
QA manager at Tipalti
“They can take my lack of knowledge and I can trust that they will be able to produce something of value.”
Ray Alde
Co-founder & cto at Arklign
“To me, that's above and beyond, I did not expect that to be so smooth and so easy.”
Mark Levine
Chief product officer at CYDEF
“They know what they're doing because the people that they send to us are quality people.”
Charles Chase
Chief technology officer at Returnmates
“There is also very good follow up on the engineers and the job they're doing.”
Olivier Mayot
Chief technology officer at SimpliField
Collaboration process overview
- 01
Initial contact. We start by understanding your testing needs and aligning them with your goals.
- 02
Assessment. Our experts analyze your current process and propose a tailored improvement plan.
- 03
PoC. Try a free proof of concept to see our capabilities in action.
- 04
Trial & evaluation. We conduct a trial phase and review the results together.
- 05
Contract & QA implementation. Once satisfied, we sign the contract and begin full-scale QA.
- 06
Flexible partnership. DeviQA offers scalable solutions to adapt to your business needs.
