test(@nestjs/event-emitter): add testing to non array metadata

tests/e2e/module-e2e.spec.ts

@@ -7,6 +7,8 @@ import {
   TEST_EVENT_PAYLOAD,
   TEST_EVENT_STRING_PAYLOAD,
 } from '../src/constants';
+import { CUSTOM_DECORATOR_EVENT } from '../src/custom-decorator-test.constants';
+import { CustomEventDecoratorConsumer } from '../src/custom-decorator-test.consumer';
 import { EventsControllerConsumer } from '../src/events-controller.consumer';
 import { EventsProviderAliasedConsumer } from '../src/events-provider-aliased.consumer';
 import { EventsProviderPrependConsumer } from '../src/events-provider-prepend.consumer';
@@ -108,6 +110,18 @@ describe('EventEmitterModule - e2e', () => {
     ).toEqual(TEST_EVENT_MULTIPLE_PAYLOAD);
   });
 
+  it('should work with non array metadata', async () => {
+    await app.init();
+
+    const emitter = app.get(EventEmitter2);
+    const customConsumer = app.get(CustomEventDecoratorConsumer);
+
+    // callback called synchronysly
+    emitter.emit(CUSTOM_DECORATOR_EVENT);
+
+    expect(customConsumer.isEmitted).toBeTruthy();
+  });
+
   afterEach(async () => {
     await app.close();
   });

tests/src/app.module.ts

@@ -1,5 +1,6 @@
 import { Module } from '@nestjs/common';
 import { EventEmitterModule } from '../../lib';
+import { CustomEventDecoratorConsumer } from './custom-decorator-test.consumer';
 import { EventsControllerConsumer } from './events-controller.consumer';
 import { EventsProviderAliasedConsumer } from './events-provider-aliased.consumer';
 import { EventsProviderPrependConsumer } from './events-provider-prepend.consumer';
@@ -26,6 +27,7 @@ import { TestProvider } from './test-provider';
       provide: 'AnAliasedConsumer',
       useExisting: EventsProviderAliasedConsumer,
     },
+    CustomEventDecoratorConsumer,
   ],
 })
 export class AppModule {}

tests/src/custom-decorator-test.constants.ts

@@ -0,0 +1 @@
+export const CUSTOM_DECORATOR_EVENT = 'custom-decorator-event';

tests/src/custom-decorator-test.consumer.ts

@@ -0,0 +1,13 @@
+import { Injectable } from '@nestjs/common';
+import { CUSTOM_DECORATOR_EVENT } from './custom-decorator-test.constants';
+import { CustomEvent } from './custom-event.decorator';
+
+@Injectable()
+export class CustomEventDecoratorConsumer {
+  public isEmitted = false;
+
+  @CustomEvent(CUSTOM_DECORATOR_EVENT)
+  handleCustomEvent() {
+    this.isEmitted = true;
+  }
+}

tests/src/custom-event.decorator.ts

@@ -0,0 +1,12 @@
+import { SetMetadata } from '@nestjs/common';
+
+import { OnEventMetadata } from '../../lib';
+import { EVENT_LISTENER_METADATA } from '../../lib/constants';
+
+import type { OnEventOptions } from '../../lib/interfaces';
+
+export const CustomEvent = (event: string, options?: OnEventOptions) =>
+  SetMetadata(EVENT_LISTENER_METADATA, {
+    event,
+    options,
+  } as OnEventMetadata);