added simplecov for measuring test coverage

Author: mackuba

.gitignore

@@ -2,6 +2,7 @@
 .rspec_status
 .yardoc
 *.yml
+coverage
 doc
 example/*.json
 Gemfile.lock

Gemfile

@@ -14,3 +14,4 @@ gem 'yard'
 gem 'rspec', '~> 3.12'
 gem 'fakefs', '~> 1.8'
 gem 'webmock', '~> 3.19'
+gem 'simplecov'

spec/spec_helper.rb

@@ -1,3 +1,10 @@
+require 'simplecov'
+
+SimpleCov.start do
+  enable_coverage :branch
+  add_filter "/spec/"
+end
+
 require 'minisky'
 require 'pp' # needs to be included before fakefs
 
@@ -14,3 +21,22 @@
     c.syntax = [:should, :expect]
   end
 end
+
+module SimpleCov
+  module Formatter
+    class HTMLFormatter
+      def format(result)
+        # silence the stdout summary, just save the html files
+        unless @inline_assets
+          Dir[File.join(@public_assets_dir, "*")].each do |path|
+            FileUtils.cp_r(path, asset_output_path, remove_destination: true)
+          end
+        end
+
+        File.open(File.join(output_path, "index.html"), "wb") do |file|
+          file.puts template("layout").result(binding)
+        end
+      end
+    end
+  end
+end