feat(cart): POST /store/carts/:id (#6274)

Depends on:
- #6262 
- #6273

integration-tests/plugins/__tests__/cart/store/update-cart.ts

@@ -0,0 +1,63 @@
+import { ModuleRegistrationName } from "@medusajs/modules-sdk"
+import { ICartModuleService } from "@medusajs/types"
+import path from "path"
+import { startBootstrapApp } from "../../../../environment-helpers/bootstrap-app"
+import { useApi } from "../../../../environment-helpers/use-api"
+import { getContainer } from "../../../../environment-helpers/use-container"
+import { initDb, useDb } from "../../../../environment-helpers/use-db"
+import adminSeeder from "../../../../helpers/admin-seeder"
+
+jest.setTimeout(50000)
+
+const env = { MEDUSA_FF_MEDUSA_V2: true }
+
+describe("POST /store/carts/:id", () => {
+  let dbConnection
+  let appContainer
+  let shutdownServer
+  let cartModuleService: ICartModuleService
+
+  beforeAll(async () => {
+    const cwd = path.resolve(path.join(__dirname, "..", "..", ".."))
+    dbConnection = await initDb({ cwd, env } as any)
+    shutdownServer = await startBootstrapApp({ cwd, env })
+    appContainer = getContainer()
+    cartModuleService = appContainer.resolve(ModuleRegistrationName.CART)
+  })
+
+  afterAll(async () => {
+    const db = useDb()
+    await db.shutdown()
+    await shutdownServer()
+  })
+
+  beforeEach(async () => {
+    await adminSeeder(dbConnection)
+  })
+
+  afterEach(async () => {
+    const db = useDb()
+    await db.teardown()
+  })
+
+  it("should create a cart", async () => {
+    const api = useApi() as any
+
+    const cart = await cartModuleService.create({
+      currency_code: "usd",
+    })
+
+    const response = await api.post(`/store/carts/${cart.id}`, {
+      email: "tony@stark.com",
+    })
+
+    expect(response.status).toEqual(200)
+    expect(response.data.cart).toEqual(
+      expect.objectContaining({
+        id: cart.id,
+        currency_code: "usd",
+        email: "tony@stark.com",
+      })
+    )
+  })
+})