Rakefile in svg-graph-2.2.0 vs Rakefile in svg-graph-2.2.1

@@ -19,14 +19,24 @@
 #  self.developer('Manuel Widmer','m-widmer_AT_gmx.com')
 #  self.rubyforge_name = 'ruby-statsample' # if different than 'svg_graph'
 #  self.remote_rdoc_dir = 'svg-graph'
 #end
 
-# run all unit tests with 'rake test'
-task default: %w[test]
+# by default run all unit tests with 'rake test'
+task default: [:test]
 
 task :test do
-  ruby "test/test_data_point.rb"
-  ruby "test/test_plot.rb"
-  ruby "test/test_svg_graph.rb"
-  ruby "test/test_graph.rb"
+  [
+    "test/test_data_point.rb",
+    "test/test_plot.rb",
+    "test/test_svg_graph.rb",
+    "test/test_graph.rb",
+    "test/run_examples_and_percy.io.rb"
+  ].each do |file|
+    # exec all above scripts (with simplecov if env is set)
+    args = file
+    if ENV['COVERAGE']
+      args = '-r ./test/simplecov ' + file
+    end
+    ruby args
+  end
 end