(maint) implement simplecov for appveyor

README.md

@@ -115,6 +115,7 @@ Travis uses a .travis.yml file in the root of your repository to learn about you
 |appveyor\_bundle\_install|Defines the bundle install command for the appveyor execution run. In our case we use bundle install `--without system_tests` as default, therefore avoiding redundant gem installation.|
 |environment|Defines any environment variables wanted for the job run. In our case we default to the latest Puppet 4 gem version.|
 |matrix|This defines the matrix of jobs to be executed at runtime. Each defines environment variables for that specific job run. In our defaults we have a Ruby version specfied, followed by the check that will be run for that job.|
+|simplecov|Set to `true` to enable collecting ruby code coverage.|
 |test\_script|This defines the test script that will be executed. For our purposes the default is set to `bundle exec rake %CHECK%`. As appveyor iterates through the test matrix as we defined above, it resolves the variable CHECK and runs the resulting command. For example, our last test script would be executed as `bundle exec rake spec`, which would run the spec tests of the module.|
 
 ### Rakefile

moduleroot/appveyor.yml.erb

@@ -26,6 +26,9 @@ environment:
 <%- (@configs['environment'] || []).each do |key, value| -%>
  <%= key %>: <%= value %>
 <%- end -%>
+<% if @configs['simplecov'] -%>
+ SIMPLECOV: yes
+<% end -%>
  matrix:
 <%- (@configs['matrix'] + (@configs['matrix_extras'] || [])).each do |matrix| -%>
  -