public void DismissAlertTest()
{
var elementActions = new ElementActions(Driver);
Driver.Url = "http://the-internet.herokuapp.com/";
elementActions.Click(By.XPath("//a[text()='JavaScript Alerts']"));
elementActions.Click(By.XPath("//button[text()='Click for JS Confirm']"));
Assert.IsTrue(elementActions.IsAlertDisplayed(), "Alert wasn't displayed.");
elementActions.DismissAlert();
Assert.IsFalse(elementActions.IsAlertDisplayed(), "Alert was still displayed.");
}