How can I tell Selenium to press cancel on a print popup?

Question

I am checking whether or not a page appears using Selenium. When I click the page, however, a printer print prompt appears (like the window that says select printer and such

Answer 1

I would simply disable the print dialog by overriding the print method :

((JavascriptExecutor)driver).executeScript("window.print=function(){};");

But if you goal is to test that the printing is called then :

// get the print button
WebElement print_button = driver.findElement(By.cssSelector("..."));

// click on the print button and wait for print to be called
driver.manage().timeouts().setScriptTimeout(20, TimeUnit.SECONDS);
((JavascriptExecutor)driver).executeAsyncScript(
    "var callback = arguments[1];" +
    "window.print = function(){callback();};" +
    "arguments[0].click();"
    , print_button);