📖 Overview
What is Unit Testing?
Unit Testing focuses on verifying the smallest testable parts of an application, such as functions, methods, or classes. It helps detect issues early and improves code reliability.
🔑 Key Aspects
Objectives, Advantages & Limitations
🎯 Objectives
- Validate individual components
- Detect bugs at an early stage
- Ensure correctness of code logic
✅ Advantages
- Early defect detection
- Improves code quality and reliability
- Makes debugging easier and faster
⚠️ Limitations
- Cannot catch integration issues
- Requires writing multiple test cases
- Maintenance overhead for test scripts
📋 Process
Unit Testing Process
- Identify modules or functions to test
- Write test cases for each unit
- Execute tests using tools like JUnit or TestNG
- Analyze results and fix defects
- Re-run tests after code changes
🌍 Example
Real-world Example
Example: Testing a function that calculates the sum of two numbers independently before using it in the main program.
🛠️ Tools
Tools for Unit Testing
JUnit (Java)
TestNG (Java)
NUnit (.NET)
PyTest (Python)
🏆 Best Practices
Best Practices for Unit Testing
Write clear and independent test cases
Automate tests for regression coverage
Keep tests small and focused on single functionality
Use mocks and stubs to isolate units from dependencies