import pytest
from engine.surge import SurgeDetector

def test_detect_surge():
    detector = SurgeDetector(multiplier=3.0)
    tickers = [
        {"symbol": "BTCUSDT", "quoteVolume": "1000000"},
        {"symbol": "NEWUSDT", "quoteVolume": "5000000"},
        {"symbol": "ETHUSDT", "quoteVolume": "800000"},
    ]
    avg_volumes = {"BTCUSDT": 900000, "NEWUSDT": 1000000, "ETHUSDT": 750000}
    surged = detector.detect(tickers, avg_volumes)
    assert "NEWUSDT" in surged
    assert "BTCUSDT" not in surged

def test_no_surge():
    detector = SurgeDetector(multiplier=3.0)
    tickers = [{"symbol": "BTCUSDT", "quoteVolume": "1000000"}]
    avg_volumes = {"BTCUSDT": 900000}
    surged = detector.detect(tickers, avg_volumes)
    assert len(surged) == 0