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backend/tests/sync_test.rs

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+use backend::{BinanceCollector, CandleData};
+use tokio::sync::mpsc;
+use dotenv::dotenv;
+use log::info;
+
+#[tokio::test]
+async fn test_build_clients() {
+    dotenv().ok();
+    env_logger::init();
+
+    info!("Testing build_clients...");
+    
+    let clients = BinanceCollector::build_clients().await;
+    
+    info!("Built {} working clients", clients.len());
+    assert!(clients.len() > 0, "Should have at least 1 working client");
+}
+
+#[tokio::test]
+async fn test_sync_single_symbol() {
+    dotenv().ok();
+    let _ = env_logger::try_init();
+
+    info!("Testing sync_from_scratch for single symbol...");
+
+    // Build clients (all work together)
+    let clients = BinanceCollector::build_clients().await;
+    assert!(!clients.is_empty(), "Need at least 1 client");
+    info!("Built {} clients", clients.len());
+
+    // Create channel
+    let (tx, mut rx) = mpsc::channel::<CandleData>(10000);
+
+    // Sync last 5 minutes of BTCUSDT
+    let now = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .as_millis() as i64;
+    let start_time = now - (5 * 60 * 1000); // 5 minutes ago
+
+    info!("Syncing BTCUSDT from {} to {}", start_time, now);
+
+    let count = BinanceCollector::sync_from_scratch(
+        "BTCUSDT".to_string(),
+        start_time,
+        clients,  // All clients work together
+        tx,
+    ).await.unwrap();
+
+    info!("Sync returned {} candles", count);
+
+    // Drain channel
+    let mut received = 0;
+    while let Ok(candle) = rx.try_recv() {
+        info!(
+            "Candle: {} ts={} o={:.2} h={:.2} l={:.2} c={:.2} nv={:.4}",
+            candle.symbol, candle.timestamp, 
+            candle.open, candle.high, candle.low, candle.close,
+            candle.net_volume
+        );
+        received += 1;
+    }
+
+    info!("Received {} candles from channel", received);
+    assert!(count >= 3, "Expected at least 3 candles for 5 min, got {}", count);
+}
+
+