Unit testing with java

Unit testing is a method of testing individual units or components of software to ensure they function as intended. In Java, unit testing can be performed using a testing framework such as JUnit. JUnit provides annotations and assertions to simplify the process of writing and executing tests.

Here is an example of a simple unit test using JUnit in Java:

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

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

In this example, the testAddition method tests the add method of the Calculator class. The assertEquals the method is used to check if the result of the add the method is equal to the expected value of 5. If the result is equal to the expected value, the test passes, otherwise, it fails.

Unit testing helps to identify bugs early in the development process and ensures that the software works as intended. It also helps to maintain the quality of the code by catching regressions and making it easier to make changes.