简述如何保证脚本的有效性 ？

WebDriverWait wait = new WebDriverWait(driver, 10);
WebElement element = wait.until(ExpectedConditions.elementToBeClickable(By.id("submitButton")));
element.click();

driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

public class LoginPage {
    private WebDriver driver;

    @FindBy(id = "username")
    private WebElement usernameField;

    @FindBy(id = "password")
    private WebElement passwordField;

    @FindBy(id = "login")
    private WebElement loginButton;

    public LoginPage(WebDriver driver) {
        this.driver = driver;
        PageFactory.initElements(driver, this);
    }

    public void login(String username, String password) {
        usernameField.sendKeys(username);
        passwordField.sendKeys(password);
        loginButton.click();
    }
}

@Before
public void setUp() {
    // 初始化测试环境
    database.resetData();
}

@After
public void tearDown() {
    // 清理测试数据
    database.clearTestData();
}

@DataProvider(name = "loginData")
public Object[][] loginData() {
    return new Object[][] {
        {"user1", "pass1"},
        {"user2", "pass2"},
    };
}

@Test(dataProvider = "loginData")
public void testLogin(String username, String password) {
    loginPage.login(username, password);
    Assert.assertTrue(driver.getTitle().contains("Welcome"));
}

@Test
public void testLogin() {
    logger.info("Starting testLogin");
    loginPage.login("user", "password");
    Assert.assertTrue(driver.getTitle().contains("Welcome"));
    logger.info("Completed testLogin");
}