Using fields as Variables

How to create a value as a variables and then use it as a JsonPath inside a test scenario

Usage of Variables

When a fixed value or a dynamically changing value(e.g. ID or Current Timestamp etc) is used in the requests in more than one steps.
This helps in resuing that value across the test scenario as a simple JSONPath e.g. ${$.step_name.request....}

Problem Example(variables)

Example: When you want to publish a message to a Kafka topic with a timestamp as <current timestamp>Z (Z is amended) or a random ID prefixed with TESLA-PROD-BATCH-3001, where 3001 is random e.g. it could be TESLA-PROD-BATCH-3009

{
    "scenarioName": "TIMESTAMP or RANDOM ID AS A VARIABLE",
    "steps": [
        {
            "name": "time_stamp",
            "url": "",
            "method": "",
            "request": {
                "now": "${LOCAL.DATETIME.NOW:yyyy-MM-dd'T'HH:mm:ss.SSSSSS}",
                "batch": "${RANDOM.NUMBER:4}"
            },
            "verify": {
                "now" : "$NOT.NULL",
                "batch" : "$NOT.NULL"
            }
        },
        {
            "name": "next_step",
            "url": "",
            "method": "",
            "request": {
                "stockTimestamp": "${$.time_stamp.response.now}Z",
                "batchId": "TESLA-PROD-BATCH-${$.time_stamp.response.batch}"
            },
            "verify": {
                "stockTimestamp": "${$.time_stamp.response.now}Z",
                "batchId": "TESLA-PROD-BATCH-${$.time_stamp.response.batch}"
            }
        }
    ]
}

Solution Using Variables

Note the 1st step uses just the ID or the timestamp without any prefix or suffix
2nd step uses just the ID or the timestamp with a prefix and suffix

Run Log(output)

Console log/output:

-----------------------------------------------------------------------------------

Scenario:
+++++++++

TIMESTAMP or RANDOM ID AS A VARIABLE 

-----------------------------------------------------------------------------------

step:time_stamp
url:
method:
request:
{
  "now" : "2024-03-26T12:30:21.170000",
  "batch" : "8526"
} 

Response:
{
  "now" : "2024-03-26T12:30:21.170000",
  "batch" : "8526"
}

---------> Expected Response: <----------
{
  "now" : "$NOT.NULL",
  "batch" : "$NOT.NULL"
} 
-done-


step:next_step
url:
method:
request:
{
  "stockTimestamp" : "2024-03-26T12:30:21.170000Z",
  "batchId" : "TESLA-PROD-BATCH-8526"
} 

Response:
{
  "stockTimestamp" : "2024-03-26T12:30:21.170000Z",
  "batchId" : "TESLA-PROD-BATCH-8526"
}

---------> Expected Response: <----------
{
  "stockTimestamp" : "2024-03-26T12:30:21.170000Z",
  "batchId" : "TESLA-PROD-BATCH-8526"
} 
 
-done-

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