The code adds WebSocket functionality for a Bitcoin blockchain explorer (Chronik), specifically the subscription and unsubscription to blocks
- Creates a WebSocket connection to Chronik
- Subscribes to block updates with ws_endpoint.subscribe_to_blocks()
- Verifies subscription status with assert_eq!(ws_endpoint.subs.blocks, true)
- Tests unsubscribing with ws_endpoint.unsubscribe_from_blocks()
- Verifies unsubscription worked with assert_eq!(ws_endpoint.subs.blocks, false)
- Resubscribes again