Add tests/test_stock.py

tests/test_stock.py

@@ -0,0 +1,69 @@
+from decimal import Decimal
+from app.services import product_service
+from app.services import stock_service
+from app.schemas.product import ProductCreate
+from app.schemas.stock_movement import StockMoveRequest
+
+
+def test_stock_increase(db):
+    prod = product_service.create_product(
+        db,
+        ProductCreate(sku="STOCK-001", name="Test", price=Decimal("10.00"), current_stock=5),
+    )
+    req = StockMoveRequest(product_id=prod.id, type="IN", quantity=10, reason="Compra")
+    mov, err = stock_service.register_movement(db, req)
+    assert err == ""
+    assert mov is not None
+    db.refresh(prod)
+    assert prod.current_stock == 15
+
+
+def test_stock_decrease(db):
+    prod = product_service.create_product(
+        db,
+        ProductCreate(sku="STOCK-002", name="Test", price=Decimal("10.00"), current_stock=20),
+    )
+    req = StockMoveRequest(product_id=prod.id, type="OUT", quantity=5, reason="Venta")
+    mov, err = stock_service.register_movement(db, req)
+    assert err == ""
+    db.refresh(prod)
+    assert prod.current_stock == 15
+
+
+def test_stock_insufficient(db):
+    prod = product_service.create_product(
+        db,
+        ProductCreate(sku="STOCK-003", name="Test", price=Decimal("10.00"), current_stock=3),
+    )
+    req = StockMoveRequest(product_id=prod.id, type="OUT", quantity=10, reason="Over sale")
+    mov, err = stock_service.register_movement(db, req)
+    assert err == "Stock insuficiente"
+    assert mov is None
+
+
+def test_stock_adjust(db):
+    prod = product_service.create_product(
+        db,
+        ProductCreate(sku="STOCK-004", name="Test", price=Decimal("10.00"), current_stock=50),
+    )
+    req = StockMoveRequest(product_id=prod.id, type="ADJUST", quantity=100, reason="Inventario")
+    mov, err = stock_service.register_movement(db, req)
+    assert err == ""
+    db.refresh(prod)
+    assert prod.current_stock == 100
+
+
+def test_stock_summary(db):
+    prod1 = product_service.create_product(
+        db,
+        ProductCreate(sku="SUM-001", name="Prod 1", price=Decimal("1.00"), min_stock=10, current_stock=5),
+    )
+    prod2 = product_service.create_product(
+        db,
+        ProductCreate(sku="SUM-002", name="Prod 2", price=Decimal("2.00"), min_stock=5, current_stock=20),
+    )
+    summary = stock_service.get_stock_summary(db)
+    assert len(summary) == 2
+    low_stock = [s for s in summary if s["is_low_stock"]]
+    assert len(low_stock) == 1
+    assert low_stock[0]["product_id"] == prod1.id