NelePointerException在硒中使用页面对象模型

Question

我目前正在尝试通过在其中实现Page Object Model来改进Selenium测试用例。 但是，我正在测试的网站处理许多模式。 当我尝试访问某些模态时，出现NullPointerException。 我无法确定驱动程序是否在等待元素或什么。

这是我的课程：

页面对象

public class ManualShipmentModal
{
WebDriver driver;
WebDriverWait wait;

@FindBy(id = "manual-order-modal")
WebElement modalBody;

@FindBy(name = "mailToName")
WebElement toName;

/* Constructor */
public ManualShipmentModal(WebDriver driver)
{
    this.driver = driver;
    driver.manage().timeouts().pageLoadTimeout(10, TimeUnit.SECONDS);
    driver.manage().timeouts().implicitlyWait(60, TimeUnit.SECONDS);

    AjaxElementLocatorFactory factory = new AjaxElementLocatorFactory(driver, 100);
    PageFactory.initElements(factory, this);
}

public boolean modalExists()
{
    return modalBody.isDisplayed();
}

public void enterToAddress(String toName, String addressName)
{
    wait.until(ExpectedConditions.visibilityOf(modalBody));
    WebElement toAddress = driver.findElement(By.linkText(addressName));

    this.toName.sendKeys(toName);
    toAddress.click();
}

}

测试班

public class TEST_11
{

WebDriver driver;

LoginPage loginPageObj;
HeaderMenu headerMenuObj;
ManualShipmentModal manualShipmentModalObj;

@Before
public void setup()
{
    driver = new ChromeDriver();
    driver.get("testpage.com");
}

@Test
public void testCreateNewShipment()
{
    loginPageObj = new LoginPage(driver);
    headerMenuObj = new HeaderMenu(driver);
    manualShipmentModalObj = new ManualShipmentModal(driver);

    loginPageObj.login("username", "password");
    headerMenuObj.createNewShipment();
    manualShipmentModalObj.enterToAddress("Test", "The Usual Test");
}

@After
public void teardown()
{
    driver.close();
}
}

运行正常，直到我调用enterToAddress（）。 当达到这一点时，它将引发NullPointerException。 即使我定义了隐式等待和显式等待，驱动程序似乎也不在等待元素加载。

Answer 1

WebDriverWait wait未实例化，因此调用它会引发NullPointerException 。

在ManualShipmentModal的构造函数中使用其构造函数：

public ManualShipmentModal(WebDriver driver)
{
    this.driver = driver;
    long timeOutInSeconds = 10; // just an arbitrary value example
    this.wait = new WebDriverWait(driver, timeOutInSeconds);

    // the rest of your constructor as in the original code
    driver.manage().timeouts().pageLoadTimeout(10, TimeUnit.SECONDS);
    driver.manage().timeouts().implicitlyWait(60, TimeUnit.SECONDS);

    AjaxElementLocatorFactory factory = new AjaxElementLocatorFactory(driver, 100);
    PageFactory.initElements(factory, this);
}