tests/dat/manifest_validate_credentials.yaml

packages:
   ValidateWhiskConfig:
     apiHost: sample.manifest.openwhisk.org
     credential: sample-manifest-credential
     namespace: sample-manifest-namespace
     actions:
       # helloworld action in NodeJS
       helloworld:
         function: actions/hello.js
         runtime: nodejs:6
         inputs:
           name:
             type: string
             description: name of a person
           place:
             type: string
             description: location of a person
         outputs:
           payload:
             type: string
             description: a simple greeting message, Hello World!