Add allKeyExists tests

[herndlm]

Closes #46 by showing that this has been fixed already. I think. If wrong - maybe somebody can point me in the direction to reproduce it to create a failing test?

[ondrejmirtes]

Can you bisect when this was fixed and why it didn't work on April 23rd? (The date on the original issue.) Basically I want you to find the commit where the test still fails, thanks.

[herndlm]

Strange, same result on all 0.12.8 (Dec 20), 0.12.9, 0.12.10, 0.12.11, 0.12.12 (Jan), 0.12.13, 0.12.14, 0.12.15 (July), 0.12.16 (Aug). I get

 ------ --------------------------------------------------------------- 
  Line   foo.php                                                        
 ------ --------------------------------------------------------------- 
  13     Dumped type: array<array('id' => int)>                         
  17     Dumped type: array<int, array<string, mixed>&hasOffset('id')>  
  21     Dumped type: array<array&hasOffset('id')>                      
 ------ --------------------------------------------------------------- 

Same thing by requiring the same version of phpstan that was reported (0.12.84)

Can this be something else? Not sure what else could be checked if I can't even find the "bad" state basically to do a real bisect 🤔

[ondrejmirtes]

No idea, but issue needs to be reproduced before we can consider it fixed.

[herndlm]

@waltertamboer it's been a while since you opened the issue, but do you maybe still know more about it?

[ondrejmirtes]

There's now a conflict in this PR, please rebase, thanks.

[ondrejmirtes]

Thank you.

[waltertamboer]

Sorry @herndlm - Missed the notifications, good job 👍

[herndlm]

@waltertamboer no worries, I did not fix anything here though. I just added tests that show that it is working fine right now. And I was not able to find out why or when it was broken.
Please let us know if the original issue is still relevant!