Nilesh Kumar

Enthusiastic software developer with keen interest in building large-scale systems. Experienced in developing end-to-end solutions using Microservice architecture and writing clean and scalable code, with excellent debugging skills.

Articles

InsightOct 28, 2025

Introduction to Integration Testing

Integration testing verifies module interactions, data flow, and system behavior. A must-have testing strategy for building reliable, scalable, and high-quality software systems.

InsightJul 17, 2025

How to Mock in Integration Tests Tools and Implementation

Mock smarter in integration testing. Explore tools like Nock, Sinon, and Jest with hands-on examples and a step-by-step guide to accurate and efficient mocks.

InsightMay 29, 2025

Introduction to Unit Testing in NestJS: Why It Matters

Learn why unit testing matters in NestJS, the tools you need (Jest, @nestjs/testing), and how to test services with a real-world UserService example.

InsightMay 29, 2025

Writing Effective Unit Tests: Best Practices

Master unit testing in JavaScript with Jest. Learn AAA pattern, mocking, isolation, test coverage, edge cases, and TDD with clear, maintainable examples.

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