How to use matcher to see if set contains or map containsKey or map (for key) has value? about fflib-apex-mocks HOT 2 CLOSED

After some inspired searching on frup42 blog, I now see how to use fflib_ArgumentCaptor to solve the above on verifying maps. Still seems as if there should be enhancement possibilities for more matchers on fflib_Match to deal with sets.

from fflib-apex-mocks.

Another Apex quirk... This compiles fine:

List<Account> records = new List<Account>{};
List<Object> castUp = (List<Object>)records;
List<Account> castDown = (List<Account>)castUp;

But this doesn't compile, because: Incompatible types since an instance of Set is never an instance of Set

Set<Account> records = new Set<Account>{};
Set<Object> castUp = (Set<Object>)records;
Set<Account> castDown = (Set<Account>)castUp;

from fflib-apex-mocks.