feat(portfolio): track realized PnL on sell orders

1 files changed, 66 insertions, 0 deletions

diff --git a/services/portfolio-manager/tests/test_portfolio.py b/services/portfolio-manager/tests/test_portfolio.py
index 92ff6ca..5a7ac64 100644
--- a/services/portfolio-manager/tests/test_portfolio.py
+++ b/services/portfolio-manager/tests/test_portfolio.py
@@ -56,3 +56,69 @@ def test_portfolio_no_position_returns_none() -> None:
     tracker = PortfolioTracker()
     position = tracker.get_position("ETH/USDT")
     assert position is None
+
+
+def test_realized_pnl_on_sell() -> None:
+    """Selling should track realized PnL."""
+    tracker = PortfolioTracker()
+
+    # Buy at 50000
+    tracker.apply_order(Order(
+        signal_id="s1", symbol="BTCUSDT", side=OrderSide.BUY,
+        type=OrderType.MARKET, price=Decimal("50000"),
+        quantity=Decimal("0.1"), status=OrderStatus.FILLED,
+    ))
+    assert tracker.realized_pnl == Decimal("0")
+
+    # Sell at 55000 — profit of 500
+    tracker.apply_order(Order(
+        signal_id="s2", symbol="BTCUSDT", side=OrderSide.SELL,
+        type=OrderType.MARKET, price=Decimal("55000"),
+        quantity=Decimal("0.1"), status=OrderStatus.FILLED,
+    ))
+    assert tracker.realized_pnl == Decimal("500")
+
+
+def test_realized_pnl_on_loss() -> None:
+    """Selling at a loss should track negative realized PnL."""
+    tracker = PortfolioTracker()
+
+    tracker.apply_order(Order(
+        signal_id="s1", symbol="BTCUSDT", side=OrderSide.BUY,
+        type=OrderType.MARKET, price=Decimal("50000"),
+        quantity=Decimal("0.1"), status=OrderStatus.FILLED,
+    ))
+    tracker.apply_order(Order(
+        signal_id="s2", symbol="BTCUSDT", side=OrderSide.SELL,
+        type=OrderType.MARKET, price=Decimal("45000"),
+        quantity=Decimal("0.1"), status=OrderStatus.FILLED,
+    ))
+    assert tracker.realized_pnl == Decimal("-500")
+
+
+def test_realized_pnl_accumulates() -> None:
+    """Multiple sells accumulate realized PnL."""
+    tracker = PortfolioTracker()
+
+    # Buy 0.2 at 50000
+    tracker.apply_order(Order(
+        signal_id="s1", symbol="BTCUSDT", side=OrderSide.BUY,
+        type=OrderType.MARKET, price=Decimal("50000"),
+        quantity=Decimal("0.2"), status=OrderStatus.FILLED,
+    ))
+
+    # Sell 0.1 at 55000 -> +500
+    tracker.apply_order(Order(
+        signal_id="s2", symbol="BTCUSDT", side=OrderSide.SELL,
+        type=OrderType.MARKET, price=Decimal("55000"),
+        quantity=Decimal("0.1"), status=OrderStatus.FILLED,
+    ))
+
+    # Sell 0.1 at 60000 -> +1000
+    tracker.apply_order(Order(
+        signal_id="s3", symbol="BTCUSDT", side=OrderSide.SELL,
+        type=OrderType.MARKET, price=Decimal("60000"),
+        quantity=Decimal("0.1"), status=OrderStatus.FILLED,
+    ))
+
+    assert tracker.realized_pnl == Decimal("1500")