capybara_case_insensitivity.rb

def find_element(xpath_expression, text, case_insensitive = false)
  exp = if case_insensitive
    xpath_expression % ["translate(text(), 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvqxyz')", text.downcase]
  else
    xpath_expression % ["text()", text]
  end

  unless elem = find(exp)
    if case_insensitive
      raise "Failed to find element using locator #{text}"
    else
      # As a convenience to the developer, try finding the element with a case insensitive search.
      # This is slower than a case sensitive search, so we don't want to try it unless we really need it.
      if elem = find_element(xpath_expression, text, true)
        warn ["The locator #{text} did not match anything using a case sensitive search.",
             "We found an element using a case-insensitive search, but this performs poorly.",
             "We recommend that you fix the casing on this locator."].join("\n")
      end
    end
  end

  elem
end