JUnit Quick Intro

JUnit is a popular testing framework for Java that helps you write and run tests for your Java code. Here are the basic steps to use JUnit in Java:

Add JUnit to Your Project:

If you're using a build tool like Maven or Gradle, you can include JUnit as a dependency in your project configuration file (pom.xml for Maven or build.gradle for Gradle).

For Maven

<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.13.2</version> <!-- Use the latest version available -->
    <scope>test</scope>
</dependency>

Write Your Test Class:

Create a new Java class for your tests. This class should contain test methods annotated with @Test.
Import the necessary JUnit classes:

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

Write Test Methods:

Write methods in your test class that test specific aspects of your code.
Use assertions (e.g., assertEquals, assertTrue, assertFalse) to verify that the actual output matches the expected output.

public class MyTest {
    @Test
    public void testAddition() {
        assertEquals(4, 2 + 2);
    }

    @Test
    public void testString() {
        assertNotNull("Hello, JUnit");
    }
}

JUnit provides many features for organizing and executing tests, such as parameterized tests, test suites, and more. The above steps cover the basics to get you started. You can refer to the JUnit documentation for more advanced features and detailed information.

Next see Assertions