$server = "puppet.example.com"

# The same as a file, except that the source is always taken
# relative to the /config module on the file server
define configfile($owner = root, $group = root, $mode = 644, $source, 
                  $backup = false, $recurse = false, $ensure = file) {
    file { $name:
            mode => $mode,
            owner => $owner,
            group => $group,
            backup => $backup,
            recurse => $recurse,
            ensure => $ensure,
            source => "puppet://$server/config/$source"
    }
}

define yumrepo($enabled = true) {
  configfile { "/etc/yum.repos.d/$name.repo":
    mode => 644,
    source => "/yum/repos/$name.repo",
    ensure => $enabled ? {
              true => file,
              default => absent
             }
  }
}

class yum-default {
  yumrepo { 
    [epel]: 
     enabled => true;
    [epel-testing]: 
      enabled => false 
  }
}