API reliability starts with tests. We implement unit and integration testing for all key API components: from validation of incoming data to interaction with databases, cache and external services. This provides predictability, stability, and rapid early error detection.
Unit-tests
Unit tests test isolated parts of code, for example:- handlers and controllers
- to the business logician
- validation functions
- serialization and deserialization of data
We use: Jest, Mocha, Pytest, PHPUnit, JUnit, Go Test, etc.
Integration tests
Integration tests test the interaction between modules and components:- API ↔ DB ↔ Cache
- API ↔ external services (e.g. payments, notifications)
- Operation of middleware, authorization, routes
- Full scripts from request to response
We use: Postman, Supertest, Testcontainers, Docker Compose, Pact, etc.
How we organize the process
Structured Test System (unit/integration/e2e)
Autorun tests via CI/CD pipeline- Test data and isolated sandbox environments
- Code coverage and stability reports
- Release blocking when critical tests fall
Product benefits
Fewer bugs with new releases- Fast error localization
- Confidence in API behavior under different loads
- Reduced manual check time
- Reliable base for writing e2e and contract tests
Where especially important
Critical APIs: Finance, Medical, Government Platforms
Applications with high release rates- Multi-dependency microservice architecture
- Commands with CI/CD processes and automatic depletion
Unit and integration tests are a guarantee that the API works exactly as intended. We will help you implement a sustainable testing strategy that ensures quality and reliability at every stage of development.
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