[LRUG] Test presence of image on page with Selenium

[Jake Prime]

Perfect, thank you.

Jake

On 10 March 2016 at 17:19, Riccardo Tacconi <rtacconi at gmail.com> wrote:

> 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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