feat: Add a simple configurable notifications subscriber (#7331)

* feat: Add a simple configurable notifications subscriber that is configurable

* Proposal on awaiting all subscribers to run

* fix: Clean up wait subscribers util and notifications test

---------

Co-authored-by: adrien2p <adrien.deperetti@gmail.com>

packages/core/medusa-test-utils/src/events.ts

@@ -0,0 +1,28 @@
+import { IEventBusModuleService } from "@medusajs/types"
+
+// Allows you to wait for all subscribers to execute for a given event. Only works with the local event bus.
+export const waitSubscribersExecution = (
+  eventName: string,
+  eventBus: IEventBusModuleService
+) => {
+  const subscriberPromises: Promise<any>[] = []
+
+  ;(eventBus as any).eventEmitter_.listeners(eventName).forEach((listener) => {
+    ;(eventBus as any).eventEmitter_.removeListener("order.created", listener)
+
+    let ok, nok
+    const promise = new Promise((resolve, reject) => {
+      ok = resolve
+      nok = reject
+    })
+    subscriberPromises.push(promise)
+
+    const newListener = async (...args2) => {
+      return await listener.apply(eventBus, args2).then(ok).catch(nok)
+    }
+
+    ;(eventBus as any).eventEmitter_.on("order.created", newListener)
+  })
+
+  return Promise.all(subscriberPromises)
+}

packages/core/medusa-test-utils/src/index.ts

@@ -1,6 +1,7 @@
 export * as TestDatabaseUtils from "./database"
-export { default as IdMap } from "./id-map"
+export * as TestEventUtils from "./events"
 export * as JestUtils from "./jest"
+export { default as IdMap } from "./id-map"
 export { default as MockManager } from "./mock-manager"
 export { default as MockRepository } from "./mock-repository"
 export * from "./init-modules"

packages/core/medusa-test-utils/src/module-test-runner.ts

@@ -78,7 +78,7 @@ export function moduleIntegrationTestRunner({
   const moduleOptions_: InitModulesOptions = {
     injectedDependencies: {
       [ContainerRegistrationKeys.PG_CONNECTION]: connection,
-      eventBusService: new MockEventBusService(),
+      ["eventBusModuleService"]: new MockEventBusService(),
       [ContainerRegistrationKeys.LOGGER]: console,
       ...injectedDependencies,
     },