How to use function inside background job?

I try to call function inside job. It does not work. Is it possible to use function inside job or not. I hope you can help me. Here is my example code.

Start-Job -Name ForestJob {param($v01,$v02)

  $line = @()

  function test {
    return "testvalue"
  }

  $t = test
  $line += $t

} -ArgumentList $var01, $var02