Make svg comparable

Author: maxmeyer

lib/geo_pattern/svg.rb

@@ -1,5 +1,7 @@
 module GeoPattern
   class SVG
+    include Comparable
+
     def initialize
       @width      = 100
       @height     = 100
@@ -67,5 +69,9 @@ def write_args(args)
     def self.as_comment(str)
       "<!-- #{str} -->"
     end
+
+    def <=>(other)
+      to_s <=> other.to_s
+    end
   end
 end

spec/spec_helper.rb

@@ -14,3 +14,6 @@
 # Loading support files
 Dir.glob(::File.expand_path('../support/*.rb', __FILE__)).each { |f| require_relative f }
 Dir.glob(::File.expand_path('../shared_examples/*.rb', __FILE__)).each { |f| require_relative f }
+
+# No need to add the namespace to every class tested
+include GeoPattern

spec/svg_spec.rb

@@ -0,0 +1,12 @@
+require 'spec_helper'
+
+RSpec.describe SVG do
+  context '#<=>' do
+    it 'is comparable' do
+      svg1 = SVG.new
+      svg2 = SVG.new
+
+      expect(svg1).to eq svg2
+    end
+  end
+end