discourse/spec/support/match_html_matcher.rb

# frozen_string_literal: true

require 'nokogiri/xml/parse_options'
RSpec::Matchers.define :match_html do |expected|
  match do |actual|
    make_canonical_html(expected).eql? make_canonical_html(actual)
  end

  failure_message do |actual|
    "after sanitizing for extra white space and compactness, expected:\n#{actual}\n to match:\n#{expected}"
  end

  failure_message_when_negated do |actual|
    "after sanitizing for extra white space and compactness, expected:\n#{actual}\n not to match:\n#{expected}"
  end

  def make_canonical_html(html)
    doc = Nokogiri::HTML5(html) do |config|
      config[:options] = Nokogiri::XML::ParseOptions::NOBLANKS | Nokogiri::XML::ParseOptions::COMPACT
    end

    doc.traverse do |node|
      if node.node_name&.downcase == "text"
        node.content = node.content.gsub(/\s+/, ' ').strip
      end
    end

    doc.to_html
  end

end