What does the testing process include and what aspects does it cover?

The software testing process includes quality assurance and verification of the application's correctness. Main aspects of testing:

• Functional testing: verifying that the program performs the declared functions.
• Non-functional testing: assessing performance, security, usability.
• Unit testing: testing individual components or methods.
• Integration testing: checking interaction between modules.
• System testing: testing the entire system as a whole.
• Acceptance testing: verifying compliance with customer requirements.

In Java, frameworks like JUnit are often used for testing. Example of a simple unit test:

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

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

Testing helps identify errors early, improve code quality, and facilitate maintenance.