Add puppet-syntax test in Rakefile

Author: Emerson Prado

Rakefile

@@ -1,4 +1,5 @@
 require 'puppetlabs_spec_helper/rake_tasks'
+require 'puppet-syntax/tasks/puppet-syntax'
 require 'puppet-lint/tasks/puppet-lint'
 
 PuppetLint.configuration.send("disable_80chars")
@@ -18,6 +19,7 @@ PuppetLint.configuration.ignore_paths = exclude_paths
 
 desc "Run syntax, lint, and spec tests."
 task :test => [
+  :syntax,
   :lint,
   :spec,
 ]