This is a general question about matching, but applies to Pact-JVM. How do I specify/match an empty JSON array. We have a response that looks like:

{
  "destinations": [],
  "cities": [],
  "airports": [
    {
      "code": "MSY",
      "name": "Louis Armstrong New Orleans International Airport"
    }
  ]
}

I want to match that "destinations" and "cities" are indeed empty lists. I am trying to use

maxArrayLike("destinations", 0, example)

but I get an error on the Consumer test complaining that I either cannot leave that field empty, or that the example of 1 doesn't match the expected size of 0. Slack Conversation

There is an empty matcher. Need to look up how that works.

Cool thanks! I did find that I was missing the "numberOfExamples" parameter in my builder, which solved the issue codewise.

Oh, it's a not empty matcher.

Thanks for the response, I appreciate it! Oh, I wonder if this is a problem with the Java library then. Of course what I want (that you are pointing out) is

cities: [ ]
destinations: [ ]

in the pact file, which is completely reasonable. But I'm not clear how to specify that in the Java DSL code (your statement: "just provide an empty array for the attribute"). Using

maxArrayLike

does result in that output, but I would love a way that makes more sense. Bing tells me that it is straightforward to match an array that has 0 or more values, but I specifically want 0.

It is a Java problem, with JS you just give an empty array. You could just try using an empty

PactDslJsonArray

(it should work in theory), but you have a working example.

Oh, that is much cleaner. I was under the impression that

array("cities")

would match an array of any size. That is much cleaner than the

maxArrayLike

syntax. Thanks!!

If you are up for a PR,

body.emptyArray("cities")

would be even better