File: have_css_matcher.rb

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RSpec::Matchers.define :have_css do |expected, times|
  match do |actual|
    selector = HTML::Selector.new(expected).select(actual)
    if times
      expect(selector.size).to eq times
    else
      expect(selector.size).to be >= 1
    end
  end

  failure_message do |actual|
    "expected #{actual.to_s} to have #{times || 1} elements matching '#{expected}'"
  end

  failure_message_when_negated do |actual|
    "expected #{actual.to_s} not to have #{times || 1} elements matching '#{expected}'"
  end
end