v1.9.4/provisioner/powershell/test-fixtures/powershell-script-provisioner.txt

{
 "type": "powershell",
 "script": "../../provisioner/powershell/test-fixtures/scripts/sample_script.ps1",
 "environment_vars": [
  "VAR1=A$Dollar",
  "VAR2=A`Backtick",
  "VAR3=A'SingleQuote",
  "VAR4=A\"DoubleQuote"
 ]
}