[LRUG] Test presence of image on page with Selenium

[Riccardo Tacconi]

file_contents == web_contents.force_encoding(Encoding::UTF_8) # => true

On 10 March 2016 at 17:01, Jake Prime <jake at team-prime.com> wrote:

> Hello!
>
> I am trying to test that a specific image is present on a page. I'd like
> to be able to write something like this:
>
> *expect(page).to have_image 'img.logo', file: '/path/to/logo/file.jpg'*
>
> I don't want to test the value of the src attribute, I want to actually
> load the file and do a binary comparison with a copy of the same image. In
> my current Cucumber scenario there is a logo on a page, I have now uploaded
> a new logo and would like to check the correct image is being displayed.
>
> I have been able to get this working using Capybara::Session#save_page as
> follows:
>
> *def has_image?(selector, options = {})*
> *  image_path = find(selector)[:src]*
>
> *  original_path = current_path*
> *  visit **image_path*
> *  match = IO.read(save_page) == IO.read(options[:file])*
> *  visit original_path*
> *  match*
> *end*
>
> This works just fine with the default driver (although in an ideal world
> I'd rather not navigate off the current page and back). But it does not
> work with Selenium, as when you visit an image file Firefox creates a
> default HTML surround page to embed the image, and therefore this is what
> is saved and compared.
>
> I tried using OpenURI, and got pretty close with this:
>
> *file_contents = open(options[:file]) { |f| f.read }*
> *web_contents = open(**image_path**) { |f| f.read }*
> *match = file_contents == web_contents*
>
> But it fails as it is comparing what appears to be a different character
> encoding:
>
> file_contents[0..30]
>
> \xFF\xD8\xFF\xE1\u001EWExif\u0000\u0000II*\u0000\b\u0000\u0000\u0000\u0010\u0000\u0000\u0001\u0003\u0000\u0001\u0000\u0000\u0000\xC0
>
> web_contents[0..30]
>
> \xFF\xD8\xFF\xE1\x1EWExif\x00\x00II*\x00\b\x00\x00\x00\x10\x00\x00\x01\x03\x00\x01\x00\x00\x00\xC0
>
>
> Can anyone help with this method, or suggest a better one?
>
> Thanks
>
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>


-- 
Riccardo Tacconi

http://github.com/rtacconi
http://twitter.com/rtacconi
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