Returning responses randomly from wiremock

Question

I need to return a random response out of a predefined set each time the same wiremock endpoint is called. How can I do it?

Answer 1

This can be achieved by using Response Templating (please see the official documentation for more information). I will assume that you are using Wiremock Standalone. The first thing that you need to do is to enable response templating, so you need to run Wiremock using --global-response-templating option. For example:

java -jar wiremock-standalone-2.27.2.jar --global-response-templating

Please note that you can also use local templating (if you want to configure templating only for a specific mock) using the option --local-response-templating

The next thing is to create a mock that uses Handlebar bars helpers, in your case you can generate a random string like this:

    {
    "request": {
        "urlPath": "/templated"
    },
    "response": {
        "body": "{{randomValue length=33 type='ALPHANUMERIC'}}",
        "transformers": ["response-template"],
        "status" : 200
    }
}

That's it. Every time that you call /templated resource you should get a different alphanumeric string. Again you can have a look to the documentation under "Random value helper" section to see which helper suits you better.