Empty handlers when use with Testing Module about cqrs

[kamilmysliwiec]

Please, provide a minimal repository which reproduces your issue.

[tormozz48]

@kamilmysliwiec Hello.

Recently I have met with the same problem. I have a unit-test with testing NestJS module:

const attacksModule = await Test.createTestingModule({
     imports: [
          CqrsModule,
     ],
     controllers: [],
     providers: [
         AddAttacksHandler
     ]
}).compile();

And also I have implemented AddAttacksHandler like this:

@CommandHandler(AddAttacksCommand)
export class AddAttacksHandler implements ICommandHandler<AddAttacksCommand> {
    constructor() {}

    async execute(command: AddAttacksCommand): Promise<void> {
         console.log('It works');
         return;
    }
}

But when I try to call command:

const commandBus: CommandBus = attacksModule.select(CqrsModule).get(CommandBus);
await commandBus.execute(new AddAttacksCommand({...}));

it throws me error: Error: The command handler for the "AddAttacksCommand" command was not found!.

[tormozz48]

Update.

If I use in my test:

attacksModule = await NestFactory.createApplicationContext(MyModule);

instead of Test.createTestingModule it works :)

So there two possible issues:

• something in cqrs module can not be properly setup for testing modules. I did not found any possible places in sources of @nestjs/cqrs.
• This is a bug in testing module