How to Write Unit Tests in Java Using JUnit?

How to Write a Unit Test in Java

To write a unit test for a Java class, you can follow these steps:

For Eclipse:

1. Create a new Java project.
2. Create a new class within the project.
3. Implement the class under test.
4. Create a new JUnit test case.
5. Initialize the test class using @Before.
6. Write the test method using @Test.
7. Assert the expected results.
8. Run the test class.

For IntelliJ:

1. Create a new directory called 'test'.
2. Mark the directory as a test source root.
3. Create a new Java class within the 'test' directory.
4. Import the JUnit library.
5. Write a test method using the @Test annotation.
6. Assert the expected results.
7. Run the test class.

The provided code sample demonstrates how to test a method that performs binary addition in Java:

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

public class MathTest {
    Math math;

    @Before
    public void setUp() throws Exception {
        math = new Math(7, 10);
    }

    @Test
    public void testAdd() {
        Assert.assertEquals(17, math.add());
    }
}

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