1 files changed, 53 insertions, 0 deletions
diff --git a/services/data-collector/tests/test_binance_rest.py b/services/data-collector/tests/test_binance_rest.py
new file mode 100644
index 0000000..695dcf9
--- /dev/null
+++ b/services/data-collector/tests/test_binance_rest.py
@@ -0,0 +1,53 @@
+"""Tests for binance_rest module."""
+import pytest
+from decimal import Decimal
+from unittest.mock import AsyncMock, MagicMock
+from datetime import datetime, timezone
+
+from data_collector.binance_rest import fetch_historical_candles
+
+
+@pytest.mark.asyncio
+async def test_fetch_historical_candles_parses_response():
+    """Verify that OHLCV rows are correctly parsed into Candle models."""
+    ts = 1700000000000  # milliseconds
+    mock_exchange = MagicMock()
+    mock_exchange.fetch_ohlcv = AsyncMock(
+        return_value=[
+            [ts, 30000.0, 30100.0, 29900.0, 30050.0, 1.5],
+            [ts + 60000, 30050.0, 30200.0, 30000.0, 30150.0, 2.0],
+        ]
+    )
+
+    candles = await fetch_historical_candles(
+        mock_exchange, "BTC/USDT", "1m", since=ts, limit=500
+    )
+
+    assert len(candles) == 2
+
+    c = candles[0]
+    assert c.symbol == "BTCUSDT"
+    assert c.timeframe == "1m"
+    assert c.open_time == datetime.fromtimestamp(ts / 1000, tz=timezone.utc)
+    assert c.open == Decimal("30000.0")
+    assert c.high == Decimal("30100.0")
+    assert c.low == Decimal("29900.0")
+    assert c.close == Decimal("30050.0")
+    assert c.volume == Decimal("1.5")
+
+    mock_exchange.fetch_ohlcv.assert_called_once_with(
+        "BTC/USDT", "1m", since=ts, limit=500
+    )
+
+
+@pytest.mark.asyncio
+async def test_fetch_historical_candles_empty_response():
+    """Verify that an empty exchange response returns an empty list."""
+    mock_exchange = MagicMock()
+    mock_exchange.fetch_ohlcv = AsyncMock(return_value=[])
+
+    candles = await fetch_historical_candles(
+        mock_exchange, "BTC/USDT", "1m", since=1700000000000
+    )
+
+    assert candles == []