问“元素当前不可见，因此可能无法交互”，同时尝试单击子菜单。

EN

@Config(url="http://flipkart.com", browser=Browser.FIREFOX)
public class TestFlikPart extends AutomationTest {
    @Test
    public void testLoginLogout() {
        String username = "<username>";
        String password = "<password>";

        click(By.cssSelector("a[href*='/login']"))
        .setText(By.cssSelector("input[name='email']"), username)
        .setText(By.cssSelector("input[name='password']"), password)
        .click(By.cssSelector("input[type='submit'][value='Login']"))

        .validatePresent(By.cssSelector("li.greeting-link > a"))

        .hoverOver(By.cssSelector("li.greeting-link > a"))

        .click(By.cssSelector("ul.account-dropdown a[href*='/logout']"))

        // should be logged out now.
        .validatePresent(By.cssSelector("a[href*='/login']"));
    }
}

actions.moveToElement(driver.findElement(by)).perform();