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I have the json below

 "menu": 
 "sections": [
 
 "type": 4,
 "frames": [
 
 "itens": []
 
 ],
 "order": 0
 ,
 
 "type": 4,
 "frames": [
 
 "itens": [
 
 "id": "1719016",
 "type": 0,
 "free": false
 
 ]
 
 ],
 "order": 1
 
 ]
 

and the test below that may check if all json itens in array itens has an ID property:

expect_json_keys('menu.sections.0.frames.*.itens.*', :id)

The problem is that this test runs fine. But should fail.

My test only fail when I change my expectations to that:

expect_json_keys('menu.sections.0.frames.*.itens.0', :id)

Why this test is succesful instead of fail when using itens.*

I reproduced your problem and tried to debug a bit.

I see this airborne gem for the first time (so take the following with a grain of salt), but I think the problem hides in the airborne implementation itself, here, to be more precise: https://github.com/brooklynDev/airborne/blob/master/lib/airborne/path_matcher.rb#L82

This line is intended to run expectation block (this one in this particular case) for each item matching the wildcarded segment, but for an empty array it simply does nothing. No expectations run - no failures.

So it's not something wrong in your tests code, it's about the gem itself.
As a kind of workaround, you could try smth. like the following:

expect_json_types('menu.sections.0.frames.*.itens', :array_of_objects) # <= add this
expect_json_keys('menu.sections.0.frames.*.itens.*', :id)

e.g. testing the type of the value before testing the value itself - in this case it fails with Expected array_of_objects got Array instead

Thank you very much @konstantin-strukov. This solution works fine for this test case.

But in some test cases I still have to write some extra code.

The expectation you´ve writen fails for this json http://www.mocky.io/v2/5c827f26310000e8421d1e83. OK, I have a test case where it should really fail. I´ll use your solution in a lot of use cases. Thank you again.

But I have some test cases that shouldn´t fail if I have at least one filled itens property (http://www.mocky.io/v2/5c827f26310000e8421d1e83). expect_json_keys('menu.sections.0.frames.*.itens.?', :id) should be sufficient but it doesn´t because it works using itens.* or itens.?. I´ve tried to fit your solution in these test cases but it didn´t work as expected.