class Spec::Runner::Formatter::HtmlFormatter

def extra_failure_content(failure)


could output links to images or other files produced during the specs.
Override this method if you wish to output extra HTML for a failed spec. For example, you 
def extra_failure_content(failure)
  require 'spec/runner/formatter/snippet_extractor'
  @snippet_extractor ||= SnippetExtractor.new
  "    <pre class=\"ruby\"><code>#{@snippet_extractor.snippet(failure.exception)}</code></pre>"
end