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RSpec::Matchers.define :match_table do |expected|
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  diffable
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  match do |actual|
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    @actual = actual.to_s.strip
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    @expected = expected.to_s.strip
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    @actual == @expected
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  end
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  failure_message do |actual|
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    <<~MSG
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      Expected:
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      #{with_whitespace_highlighted(expected.to_s.strip)}
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      Received:
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      #{with_whitespace_highlighted(actual.to_s.strip)}
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      Raw Result:
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      #{actual}
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    MSG
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  end
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  def with_whitespace_highlighted(string)
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    string.lines.map { |line| "'#{line.gsub("\n", '')}'" }.join("\n")
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  end
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end
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