Generic selenium testing images

Wi开发者_开发问答th selenium can one run a test which check all images on a current page if they contain ALT attribute and report images not having it ?

Yes. The first thing you need to do is decide which selenium you want to use.

• You can use Selenium IDE, where a test consists of an HTML table.
• You can use Selenium RC, where you write a test in a programming language (eg. C#, Java, PHP, Ruby, etc).

The latter is a little more complex at first, but if you want real power, you will use that method.

Then, you'll need to learn how to find all the images on a page. //img is a good XPath query to use. For Xpath details, see w3schools, and especially this page.

Then you'll want to find images with an alt attribute: //img[@alt]

One approach would be to count how many images there are, and subtract the number with alt attributes.

You can also do this in WebDriver (soon to be Selenium 2). The following example is for TestNG/Java but other client languages are available.

List<WebElement> images = driver.findElements(By.xpath("//img[not(@alt)]"));
assertEquals(images.size(), 0);

For more feedback you could also use something like the following to output details of the images without alt attributes:

for(WebElement image : images) {
    System.out.println(image.getAttribute("src"));
}

We have a similar test but we grab the page's Html and parse out the images with a regular expression and then match on a second regular expression looking for the alt tag. I haven't done a speed test, but I think it might be faster than doing the Xpath route.