Introduce product details table

test/test_admin.py

@@ -12,6 +12,7 @@ from allmende_payment_system.models import (
     Area,
     Permission,
     Product,
+    ProductDetails,
     User,
     UserGroup,
 )
@@ -219,9 +220,49 @@ def test_add_product(test_db, client, admin_user):
         follow_redirects=False,
     )
     assert response.status_code == 303
-    product = test_db.execute(
-        select(Product).where(Product.name == "Test Product")
-    ).scalar()
+    product = test_db.execute(select(Product)).scalar()
     assert product is not None
-    assert product.name == "Test Product"
-    assert product.price == Decimal("9.99")
+    assert len(product.details_history) == 1
+    assert product.current_details.name == "Test Product"
+    assert product.current_details.price == Decimal("9.99")
+
+
+def test_change_product(test_db, client, admin_user):
+    area = Area(name="Test Area", description="An area for testing")
+    test_db.add(area)
+    product = Product(
+        area=area,
+    )
+    product.details_history.append(
+        ProductDetails(
+            name="Test Product",
+            price=Decimal("9.99"),
+            unit_of_measure="piece",
+            vat_rate=Decimal("19.00"),
+        )
+    )
+    test_db.add(product)
+    test_db.flush()
+
+    response = client.post(
+        f"/admin/products/edit/{product.id}",
+        data={
+            "name": "Updated Product",
+            "vat_rate": "7.00",
+            "unit_of_measure": "kg",
+            "price": 19.99,
+            "area_id": area.id,
+        },
+        user=admin_user,
+        follow_redirects=False,
+    )
+    assert response.status_code == 303
+
+    updated_product = test_db.execute(
+        select(Product).where(Product.id == product.id)
+    ).scalar()
+
+    assert len(updated_product.details_history) == 2
+    assert updated_product.current_details.name == "Updated Product"
+    assert updated_product.current_details.price == Decimal("19.99")
+    assert updated_product.current_details.price == Decimal("19.99")