This procedure describes how you can implement the Test Connection functionality using a flow.

1. Define a simple flow with a GET call to an idempotent test API.
   Here is a sample code:

   "flows": {  
      "testConnectionFlow" :{
         "id": "testConnectionFlow",
         "description": "testConnectionFlow",
         "specVersion": "0.8",
         "version": "0.1",
         "start": "startState",
         "functions": [
           {
             "name": "generalRestFunc",
             "type": "custom",
             "operation": "connectivity::rest"
           }
         ],
         "states": [
           {
             "name": "startState",
             "type": "operation",
             "actions": [
               {
                 "functionRef": {
                   "refName": "generalRestFunc",
                   "arguments": {
                     "uri": "${.connectionProperties.baseURL + \"/customers\"}",
                     "method": "GET"
                   }
                 },
                 
               }
             ],
             "end": true
           }
         ]
       }
   }

2. Add a actionDataFilter action that asserts a condition and set the .output.success to true to assert the status code.
   Here is a sample code:

   "actionDataFilter": {
                   "results": "${ { success: (.status==200), message: .body.origin } }",
                   "toStateData": "${ .output }"
                 }

   Here is the full sample code that makes an outbound GET call to the test endpoint and uses state's boolean output value to indicate the result:

   "flows": {   
      "testConnectionFlow" :{
         "id": "testConnectionFlow",
         "description": "testConnectionFlow",
         "specVersion": "0.8",
         "version": "0.1",
         "start": "startState",
         "functions": [
           {
             "name": "generalRestFunc",
             "type": "custom",
             "operation": "connectivity::rest"
           }
         ],
         "states": [
           {
             "name": "startState",
             "type": "operation",
             "actions": [
               {
                 "functionRef": {
                   "refName": "generalRestFunc",
                   "arguments": {
                     "uri": "${.connectionProperties.baseURL + \"/customers\"}",
                     "method": "GET"
                   }
                 },
                 "actionDataFilter": {
                   "results": "${ { success: (.status==200), message: .body.origin } }",
                   "toStateData": "${ .output }"
                 }
               }
             ],
             "end": true
           }
         ]
       }
   }

3. Call the flow in the connection definition.
   Here is the sample code:

   "connectionDefinition": {
     "connectionProperties": [
     ],
     "securityPolicies": [
       {
       "type": "managed",
       "policy": "BASIC_AUTH",
       "description": "Account credentials",
       "displayName": "Account credentials",
       "scope": "ACTION",
       "securityProperties": [
         {
           "name": "username",
           "hidden" : true,
           "default": "oracle"
         }
       ]   
       }
     ],
     "test": "flow:testConnectionFlow"