What is unit testing?

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🔹 What is Unit Testing?

Unit Testing is a type of software testing where individual units/components of code (like methods, functions, or classes) are tested in isolation to ensure they work as expected.

• Unit = the smallest testable part of an application (e.g., a single function in Java, Python, or JS).

• The goal is to verify correctness of each unit before combining them into a bigger system.

🔹 Key Characteristics of Unit Testing:

1. Isolated → Tests only one piece of code at a time (no DB, network, or external services ideally).

2. Automated → Usually written as code (e.g., using JUnit, NUnit, PyTest, Jest).

3. Repeatable → Should give the same result every time.

4. Fast → Runs quickly since it tests small units.

5. Early Detection → Catches bugs in the development phase itself.

🔹 Example of Unit Testing

✅ Java (JUnit Example)

import static org.junit.Assert.*;
import org.junit.Test;

public class CalculatorTest {
    
    @Test
    public void testAdd() {
        Calculator calc = new Calculator();
        int result = calc.add(2, 3);
        assertEquals(5, result);
    }
}

Here:

• We’re testing the add() method of Calculator.

• If the method works correctly, test passes ✅.

• If not, test fails ❌.

✅ Python (PyTest Example)

def add(a, b):
    return a + b

def test_add():
    assert add(2, 3) == 5

🔹 Benefits of Unit Testing:

• Ensures code correctness at the smallest level.

• Makes debugging easier (failures point to exact method).

• Encourages clean, modular, and maintainable code.

• Supports regression testing (prevents old bugs from reappearing).

• Builds confidence to refactor or enhance code safely.

🔹 Tools/Frameworks for Unit Testing:

• Java → JUnit, TestNG

• Python → PyTest, unittest

• JavaScript → Jest, Mocha

• C#/.NET → NUnit, MSTest

• C/C++ → Google Test (gtest)

✅ In short:
Unit Testing = testing individual functions/methods in isolation to ensure they work correctly. It’s the first and most important level of automated testing.

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How do you test APIs using Postman?

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