What is Java unit testing and why is it important?

What is Java unit testing and why is it important?

Java unit testing is a method of testing individual units of source code to ensure they work as intended. It's important because it helps catch bugs early, improves code quality, and facilitates changes in the codebase.

Can you explain how to write a simple unit test in Java?

Sure! You can use JUnit, a popular testing framework. Here's a simple example:

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

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

What are some best practices for unit testing in Java?

Some best practices include:

1. Write tests for all public methods.
2. Keep tests independent from each other.
3. Use descriptive names for test methods.
4. Test edge cases and error conditions.

How do I run my unit tests in an IDE like IntelliJ?

In IntelliJ, you can run your unit tests by right-clicking on the test class or method and selecting 'Run'. You can also use the built-in test runner to see results and coverage.