Json matcher: not /#(i) / ("a" -> "b") does not work

[trobert]

The following test pass successfully but should fail:

  val array = """ [ { "a" : "b" } ] """
  array must /#(0) / ("a" -> "b")         // Success
  array must not /#(0) / ("a" -> "b")     // Should fail
  array must not (/#(0) / ("a" -> "b"))   // Should fail
  array must /#(0).not / ("a" -> "b")     // Should fail

Looking at the code, I see that the JsonSelector object is loss when you apply "not", because a new JsonPairMatcher object is created, loosing the overriding of the navigate method.

Moreover my initial need was to check that an array only contains one element. I didn't found any way to do it. Any suggestion ? I wanted something like array must not /#(1) / (".*".r -> ".*".r)

[etorreborre]

Sorry I didn't notice the notification earlier. I'm going to have a look at that this week-end. In the meantime you can create a not condition by writing:

 (array must /#(0) / ("a" -> "b")).not

I'll think about your "1 element check" and come back to you.

[etorreborre]

This is a first attempt at adding ways to check sizes. What do you think?

[trobert]

Your proposal fits my need. Thanks !

Some additional thoughts:
I was thinking about a haveSize(m: Matcher[Int]) matcher, to be able to write more complex check on the size, like for expample, array must withSize(be_<=(2))
However I realised that is even not possible on plain Traversable. So maybe I am going too far. On the other, while you can write a check on the size of a plain traversable, you can't do it directly on the size of a json array.

[etorreborre]

Sorry it took me a lot more time to fix than I thought, I had to do a rewrite... That made me realize that the whole JsonMatchers API is not ideal and should be probably abandoned in favor of some Argonaut matchers.

For the size example, it's done here, and you can use any Matcher[JsonType] where JsonType is either an array or a map.