Comma separated query string implementation not delivering the desired payload

[sanathko]

I have a URL (GET REQUEST) of the following pattern

^/testpath/1/test?pathid=1
^/testpath/1/test?pathid=1,2
^/testpath/1/test?pathid=1,2,5
where pathid query string parameters are comma separated

I have the following stubby mappings to match these url patterns

- request:
    url: ^/testpath/(.*)/test
    query:
      pathid: '1'
    method: GET
  response:
    headers:
      Content-Type: application/json
    status: 200
    file: response/path-1.json

- request:
    url: ^/testpath/(.*)/test
    query:
      pathid: '1,2'
    method: GET
  response:
    headers:
      Content-Type: application/json
    status: 200
    file: response/path-2.json

- request:
    url: ^/testpath/(.*)/test
    query:
      pathid: '1,2,5'
    method: GET
  response:
    headers:
      Content-Type: application/json
    status: 200
    file: response/path-3.json

but I can't get this URL mapping to properly deliver different payloads based on different parameter combinations.

1 -> payload1
1,2 -> payload2
1,2,5 -> payload3
how can this be done?