Posted almost 8 years ago. Visible to the public. Repeats.

Grep through the DOM using the Capybara API

When your Cucumber feature needs to browse the page HTML, and you are not sure how to express your query as a clever CSS or XPath expression, there is another way: You can use all and find to grep through the DOM and then perform your search in plain Ruby.

Here is an example for this technique:

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Then /^I should see an image with the filename "([^\"]*)"$/ do |filename| patiently do page.all('img').detect do |img| img[:src].include?("/#{filename}") end.should be_present end end

Note that the check needs to be wrapped in a patiently helper since the DOM might change between page.all('img') and the check img[:src].include?, causing a Selenium::WebDriver::Error::StaleElementReferenceError.

Of course if you can express a check in a readable CSS query, you should always do so. It does not need patiently since it is executed in a single Selenium command:

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Then /^I should see an image with the filename "([^\"]*)"$/ do |filename| page.should have_css("img[src^='/#{filename}']") end

By refactoring problematic code and creating automated tests, makandra can vastly improve the maintainability of your Rails application.

Owner of this card:

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Henning Koch
Last edit:
over 1 year ago
by Henning Koch
Keywords:
traverse
About this deck:
We are makandra and do test-driven, agile Ruby on Rails software development.
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Posted by Henning Koch to makandra dev
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