tests/unit-tests/config-files/config-ca-4

{
  "ca-prefix": "/ndn",
  "ca-info": "unsupported challenge",
  "max-validity-period": "86400",
  "max-suffix-length": 3,
  "probe-parameters":
  [
      { "probe-parameter-key": "full name" }
  ],
  "supported-challenges":
  [
      { "challenge": "something" }
  ]
}