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Last active August 29, 2015 14:14
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Example of Capybara `synchronize` in a matcher
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Matcher
def has_analytics_message?(msg)
document.synchronize do |variable|
gaq = evaluate_script('window._gaq')
raise Capybara::ElementNotFound, "#{msg} was not fired.\nActual analytics events triggered:\n\n#{gaq}" unless gaq.include?(msg)
end
true
end
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gpleiss commented Feb 6, 2015

This matcher is checking the window._gaq javascript variable to see if it has a value.

We need to wrap this in a synchronize block, because we want to wait until this javascript block becomes true.

The thing that always gets me: the synchronize block needs to throw a Capybara::ElementNotFound exception. When this exception is caught, it reruns the synchronize block until it's true, or until the default timeout is hit.

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