assert all selectors are tested

[blitmap]

Issue #41 is a result of $hasAll not having a test - I'd like to suggest that a "meta-test" be added simply to make sure all query selectors have an associated test. This would assert a certain level test coverage.

I imagine it would look something like looping over Query.selectors and making sure a key for the selector exists in queryTests:

https://github.com/bevry/query-engine/blob/master/src/documents/test/queries-test.js.coffee#L71

The selectors are defined here:

https://github.com/bevry/query-engine/blob/master/src/documents/lib/query-engine.js.coffee#L1214-L1470

It could even be as simple/naive as:

Object.keys(queryTests).length is Object.keys(Query.selectors).length

PS: If you want to get even more meta - test just $hasAll and then use that to test that queryTests has all of the keys of Query.selectors. WE CAN GO DEEPER