How do I test static methods in Java?

How do I test static methods in Java?

Testing static methods can be tricky since they belong to the class rather than an instance. You can use frameworks like JUnit.

Can you show me an example of testing a static method?

Sure! If you have a static method like MathUtils.add(int a, int b), you can write a test like this:

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

public class MathUtilsTest {
    @Test
    public void testAdd() {
        assertEquals(5, MathUtils.add(2, 3));
    }
}

What if the static method has dependencies?

In that case, you might want to refactor the code to use dependency injection or use mocking frameworks like Mockito to isolate the method.

Are there any best practices for testing static methods?

Yes, try to keep static methods simple, avoid side effects, and consider using instance methods when possible for better testability.