Tests Needed For LRU/LFU and HotKey Ananlyzer

[HDT3213]

Find the hottest N keys by LFU frequency from an RDB file.

Prerequisites: The RDB file must come from a Redis instance with LFU eviction policy (maxmemory-policy allkeys-lfu or volatile-lfu).

rdb -c hotkey -n 50 -o hotkey.csv dump.rdb

What to test:

• Generate an RDB from a Redis instance with allkeys-lfu or volatile-lfu policy, verify the output contains correct LFU frequencies in JSON output
• Generate an RDB from Redis with allkeys-lru or volatile-lru policy, verify the output contains correct LRU idle time field in JSON output
• Test with -n flag (different values like 1, 10, 100)
• Test with -regex filter combined with hotkey