Re: [Webtest] verifyImages don't likes .png images?

Fri, 04 Sep 2009 01:21:19 -0700 

Hi,
WebTest's verifyImage doesn't check the image itself. It just check if it receives binary content with a successful HTTP response code. 

Cheers,
Marc.
--
Web: http://www.efficient-webtesting.com
Blog: http://mguillem.wordpress.com

David Koo wrote:

Hi Avander,


This is probably due to the PNG being wrongly encoded somehow or perhaps 
they are using some fancy PNG features that WebTest can't understand? I 
would open the troublesome PNG in Photoshop or GIMP and compare the file 
info (using the inspector) to a PNG file that does display (such as this 
one: http://tuxpaint.org/stamps/stamps/animals/birds/cartoon/tux.png) 
and then see what the difference is.



Also, try viewing the image with different browsers as the browser 
support for PNG is quite variable 
(http://en.wikipedia.org/wiki/Portable_Network_Graphics#Web_browser_support_for_PNG)


Dave


On Thu, Sep 3, 2009 at 6:18 AM, A Vander <[email protected] 
<mailto:[email protected]>> wrote:



    Hi webtesters,

    I have a webtest that breaks on a verifyImages step. Both images in
    error
    are small .png that do appear ok when I surf to the page manually,
    there are
    no other .png images on that page, a few .jpg and .gif images pass
    the step.

    Strangely when I type the url of these images in the adress bar of the
    browser I get text for the .png and corresponding images for the
    .jpg and
    .gif...

    Any thoughts on this issue?
    TIA, Avander


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