What types of testing scenarios have you implemented or tested in your practice?

In Java testing practice, the following types of scenarios are usually implemented and tested:

• Unit tests — verify individual methods or classes for correctness.
• Integration tests — verify interaction between multiple components or modules.
• Functional tests — verify that the application performs specified functions according to requirements.
• Regression tests — verify that new changes have not broken existing functionality.
• Performance tests — evaluate the speed and load resilience of the application.

Example of a simple unit test using JUnit:

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

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