public abstract class BaseTest {
    protected WebDriver driver;

    @BeforeEach
    public void setUp() throws Exception {
        // Set environment variables
        driver = new BrowserFactory()
                    .setHeadless(Boolean.parseBoolean(System.getenv("SELENIUM_HEADLESS")))
                    .getInstance(System.getenv("SELENIUM_BROWSER"));
        // More code
    }

    @AfterEach
    public void tearDown() {
        driver.quit();
    }
}