Github Issue for file caching

[chlaw27]

When I run "make test" I get the following error in my MacOS machine.

======================================================= FAILURES ========================================================
______________________________________________ test_lru_respects_get_calls ______________________________________________

cache = <biolearn.cache.LocalFolderCache object at 0x3088c6420>

def test_lru_respects_get_calls(cache):
    # Store items exceeding the cache size limit
    cache.store("key1", "a" * 500)
    time.sleep(2)  # Ensure file timestamps are different
    cache.store("key2", "b" * 400)
    time.sleep(2)
    cache.get("key1")  # Ensure Key1 most recently used
    time.sleep(2)
    cache.store("key3", "c" * 150)

    # Check that the least recently used item (key1) is evicted

  assert cache.get("key1") == "a" * 500

E AssertionError: assert None == ('a' * 500)
E + where None = get('key1')
E + where get = <biolearn.cache.LocalFolderCache object at 0x3088c6420>.get

biolearn/test/test_cache.py:59: AssertionError

I haven't touched the caching code and haven't run into this issue for a while when pushing and pull requesting until now.