#[cfg(test)]
mod handle_input_tests {
    use crate::p2p::handle_input::handle_input_line;
    use libp2p::kad::{self, store::MemoryStore, Record, RecordKey, Quorum};
    use libp2p::{identity, PeerId, StreamProtocol};
    use std::collections::HashSet;

    // Helper to create a dummy Kademlia behaviour for testing
    fn create_dummy_kademlia() -> kad::Behaviour<MemoryStore> {
        let peer_id = identity::Keypair::generate_ed25519().public().to_peer_id();
        let store = MemoryStore::new(peer_id);
        let mut config = kad::Config::new(StreamProtocol::new("/dummy/proto"));
        config.set_query_timeout(std::time::Duration::from_secs(1)); // Short timeout for tests
        kad::Behaviour::with_config(peer_id, store, config)
    }

    #[test]
    fn test_handle_input_line_get() {
        let mut kademlia = create_dummy_kademlia();
        let line = "GET some_key".to_string();
        // This should call kademlia.get_record(RecordKey::new("some_key"))
        // We can't assert the call directly without a mock that records calls.
        // The primary goal here is to ensure it runs without panicking.
        handle_input_line(&mut kademlia, line);
        // If it panics, the test will fail.
    }

    #[test]
    fn test_handle_input_line_get_providers() {
        let mut kademlia = create_dummy_kademlia();
        let line = "GET_PROVIDERS another_key".to_string();
        handle_input_line(&mut kademlia, line);
    }

    #[test]
    fn test_handle_input_line_put() {
        let mut kademlia = create_dummy_kademlia();
        let line = "PUT key_to_put value_to_put".to_string();
        handle_input_line(&mut kademlia, line);
        // This should call put_record and start_providing.
    }

    #[test]
    fn test_handle_input_line_put_provider() {
        let mut kademlia = create_dummy_kademlia();
        let line = "PUT_PROVIDER provider_key".to_string();
        handle_input_line(&mut kademlia, line);
        // This should call start_providing.
    }

    #[test]
    fn test_handle_input_line_invalid_command() {
        let mut kademlia = create_dummy_kademlia();
        let line = "INVALID_COMMAND".to_string();
        // This should print an error to stderr. We can't assert stderr output.
        // The test will pass if it doesn't panic.
        handle_input_line(&mut kademlia, line);
    }

    #[test]
    fn test_handle_input_line_missing_args_get() {
        let mut kademlia = create_dummy_kademlia();
        let line = "GET".to_string();
        // This should print "Expected key" to stderr.
        handle_input_line(&mut kademlia, line);
    }

    #[test]
    fn test_handle_input_line_missing_args_put() {
        let mut kademlia = create_dummy_kademlia();
        let line = "PUT key_only".to_string();
        // This should print "Expected value" to stderr.
        handle_input_line(&mut kademlia, line);
    }
}