fix(medusa): Validate customer_id when completing a cart (#3967)

integration-tests/api/__tests__/store/cart/cart.js

@@ -2152,6 +2152,33 @@ describe("/store/carts", () => {
     })
   })
 
+  it("complete cart throws if there is no customer on the cart", async () => {
+    const api = useApi()
+    const product = await simpleProductFactory(dbConnection)
+    const region = await simpleRegionFactory(dbConnection, { tax_rate: 10 })
+    const cart = await simpleCartFactory(dbConnection, {
+      region: region.id,
+      line_items: [
+        {
+          variant_id: product.variants[0].id,
+          quantity: 1,
+          unit_price: 1000,
+        },
+      ],
+    })
+
+    await api.post(`/store/carts/${cart.id}/payment-sessions`)
+
+    try {
+      await api.post(`/store/carts/${cart.id}/complete`)
+    } catch (err) {
+      expect(err.response.status).toEqual(400)
+      expect(err.response.data.message).toEqual(
+        "Cannot create an order from the cart without a customer"
+      )
+    }
+  })
+
   describe("POST /store/carts/:id/shipping-methods", () => {
     beforeEach(async () => {
       await cartSeeder(dbConnection)

integration-tests/plugins/__tests__/inventory/cart/cart.js

@@ -222,8 +222,7 @@ describe("/store/carts", () => {
       expect(getRes.response.status).toEqual(400)
       expect(getRes.response.data).toEqual({
         type: "invalid_data",
-        message:
-          "Can't insert null value in field customer_id on insert in table order",
+        message: "Cannot create an order from the cart without a customer",
       })
 
       const inventoryService = appContainer.resolve("inventoryService")
@@ -232,6 +231,7 @@ describe("/store/carts", () => {
       })
       expect(count).toEqual(0)
     })
+
     it("fails to add a item on the cart if the inventory isn't enough", async () => {
       const api = useApi()