Class: LookbookVisualTester::ImageComparator

Inherits:
Object
  • Object
show all
Defined in:
lib/lookbook_visual_tester/image_comparator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ImageComparator

Returns a new instance of ImageComparator.



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# File 'lib/lookbook_visual_tester/image_comparator.rb', line 7

def initialize
  @baseline_dir = LookbookVisualTester.config.baseline_dir
  @current_dir = LookbookVisualTester.config.current_dir
  @diff_dir = LookbookVisualTester.config.diff_dir
end

Instance Attribute Details

#baseline_dir ⇒ Object (readonly)

Returns the value of attribute baseline_dir.



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# File 'lib/lookbook_visual_tester/image_comparator.rb', line 5

def baseline_dir
  @baseline_dir
end

#current_dir ⇒ Object (readonly)

Returns the value of attribute current_dir.



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# File 'lib/lookbook_visual_tester/image_comparator.rb', line 5

def current_dir
  @current_dir
end

#diff_dir ⇒ Object (readonly)

Returns the value of attribute diff_dir.



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# File 'lib/lookbook_visual_tester/image_comparator.rb', line 5

def diff_dir
  @diff_dir
end

Instance Method Details

#compare(scenario_run) ⇒ Object 



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# File 'lib/lookbook_visual_tester/image_comparator.rb', line 13

def compare(scenario_run)
  filename = scenario_run.filename

  current_path = current_dir.join(filename)
  baseline_path = baseline_dir.join(filename)
  diff_path = diff_dir.join(scenario_run.diff_filename)

  if baseline_path.exist?
    baseline_image = MiniMagick::Image.open(baseline_path)
    current_image  = MiniMagick::Image.open(current_path)

    unless baseline_image.dimensions == current_image.dimensions
      puts '    Image dimensions do not match. Skipping comparison.'
      return
    end

    begin
      compare_command = "compare -metric AE \"#{baseline_path}\" \"#{current_path}\" \"#{diff_path}\" 2>&1"
      result = `#{compare_command}`
      distortion = result.strip.to_i

      if distortion > 0
        puts "    Differences found! Diff image saved to #{diff_path}"
      else
        puts '    No differences detected.'
        File.delete(diff_path) if diff_path.exist?
      end
    rescue StandardError => e
      puts "    Error comparing images: #{e.message}"
    end
  else
    FileUtils.cp(current_path, baseline_path)
    puts "    Baseline image created at #{baseline_path}"
  end
end