Unittests for lru_cache.dart

[palisadoes]

The Talawa code base needs to be 100% reliable. This means we need to have 100% unittest code coverage.

We will need unittests done for all methods, classes and functions found in this file.

Any widgets referenced in this file must also have unittests done

after_auth_view_models/chat_view_models/lru_cache.dart

This file can be found in the lib/view_model directory

Parent Issue: #1003

[nishnatadebnath]

Please assign this to me.

[nishnatadebnath]

@CyberWake I have some doubt regarding the logic used for the /after_auth_view_models/chat_view_models/lru_cache.dart .
So while testing it I found out that we are initializing the LRUChatListCache using the following constructer.

LRUChatListCache() {
    cache = <String, ChatListNode>{};

    head = ChatListNode();

    tail = ChatListNode();

    head.next = tail;

    tail.prev = head;
  }

So now my doubt is should not we initialise the head and tail pointing to the same chatListNode at first addition of a chat,again if there is no chat we should not be having those initializations and head and tail should point to null.

[nishnatadebnath]

@palisadoes the lru_cache.dart code logic is bugged ,can I make changes to the code so that it works properly along with the unit testing?

[palisadoes]

Yes

[palisadoes]

@nishnatadebnath Are you still working on this?

[nishnatadebnath]

Yes . Sorry for the delay @palisadoes , shifting to college hostel I will complete it by 24 hr.