What actions do you take to confirm task completion in your last project?

To confirm task completion in my last project, I usually perform several steps:

1. Code review: Ensure all changes are committed and pass local tests.
2. Unit tests: Write and run unit tests to verify functionality.
3. Code review: Submit changes for peer review and consider their feedback.
4. Integration tests: Check that new features do not break existing system.
5. Demonstration: If needed, show the result to the client or team lead.
6. Documentation: Update documentation if required.

Example of a simple unit test in Java with JUnit:

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));
    }
}