Implement distributed event handler to propagate ad deletion

src/app.constants.ts

@@ -15,6 +15,9 @@ export const MATCHER_AD_CREATION_FAILED_ROUTING_KEY =
 export const AD_CREATED_MESSAGE_HANDLER = 'adCreated';
 export const AD_CREATED_ROUTING_KEY = 'ad.created';
 export const AD_CREATED_QUEUE = 'matcher.ad.created';
+export const AD_DELETED_MESSAGE_HANDLER = 'adDeleted';
+export const AD_DELETED_ROUTING_KEY = 'ad.deleted';
+export const AD_DELETED_QUEUE = 'matcher.ad.deleted';
 
 // health
 export const GRPC_HEALTH_PACKAGE_NAME = 'health';

src/modules/ad/ad.mapper.ts

@@ -1,19 +1,19 @@
+import { ExtendedMapper } from '@mobicoop/ddd-library';
+import { DirectionEncoderPort } from '@modules/geography/core/application/ports/direction-encoder.port';
 import { Inject, Injectable } from '@nestjs/common';
-import { AdEntity } from './core/domain/ad.entity';
-import {
-  AdWriteModel,
-  AdReadModel,
-  ScheduleItemModel,
-  AdWriteExtraModel,
-} from './infrastructure/ad.repository';
 import { v4 } from 'uuid';
+import { AD_DIRECTION_ENCODER } from './ad.di-tokens';
+import { AdEntity } from './core/domain/ad.entity';
 import {
   ScheduleItem,
   ScheduleItemProps,
 } from './core/domain/value-objects/schedule-item.value-object';
-import { DirectionEncoderPort } from '@modules/geography/core/application/ports/direction-encoder.port';
-import { AD_DIRECTION_ENCODER } from './ad.di-tokens';
-import { ExtendedMapper } from '@mobicoop/ddd-library';
+import {
+  AdReadModel,
+  AdWriteExtraModel,
+  AdWriteModel,
+  ScheduleItemModel,
+} from './infrastructure/ad.repository';
 
 /**
  * Mapper constructs objects that are used in different layers:
@@ -97,7 +97,7 @@ export class AdMapper
         frequency: record.frequency,
         fromDate: record.fromDate.toISOString().split('T')[0],
         toDate: record.toDate.toISOString().split('T')[0],
-        schedule: record.schedule.map(
+        schedule: record.schedule?.map(
           (scheduleItem: ScheduleItemModel) =>
             new ScheduleItem({
               day: scheduleItem.day,
@@ -111,12 +111,14 @@ export class AdMapper
               margin: scheduleItem.margin,
             }),
         ),
-        waypoints: this.directionEncoder
-          .decode(record.waypoints)
-          .map((coordinates, index) => ({
-            position: index,
-            ...coordinates,
-          })),
+        waypoints: record.waypoints
+          ? this.directionEncoder
+              .decode(record.waypoints)
+              .map((coordinates, index) => ({
+                position: index,
+                ...coordinates,
+              }))
+          : [],
         fwdAzimuth: record.fwdAzimuth,
         backAzimuth: record.backAzimuth,
         points: [],

src/modules/ad/ad.module.ts

@@ -1,49 +1,51 @@
-import { Module, Provider } from '@nestjs/common';
-import { CqrsModule } from '@nestjs/cqrs';
-import {
-  AD_MESSAGE_PUBLISHER,
-  AD_REPOSITORY,
-  AD_DIRECTION_ENCODER,
-  AD_ROUTE_PROVIDER,
-  TIMEZONE_FINDER,
-  TIME_CONVERTER,
-  INPUT_DATETIME_TRANSFORMER,
-  OUTPUT_DATETIME_TRANSFORMER,
-  MATCHING_REPOSITORY,
-  AD_CONFIGURATION_REPOSITORY,
-  GEOGRAPHY_PACKAGE,
-} from './ad.di-tokens';
+import { ConfigurationRepository } from '@mobicoop/configuration-module';
 import { MessageBrokerPublisher } from '@mobicoop/message-broker-module';
-import { AdRepository } from './infrastructure/ad.repository';
-import { PrismaService } from './infrastructure/prisma.service';
-import { AdMapper } from './ad.mapper';
-import { AdCreatedMessageHandler } from './interface/message-handlers/ad-created.message-handler';
-import { PostgresDirectionEncoder } from '@modules/geography/infrastructure/postgres-direction-encoder';
 import { GeographyModule } from '@modules/geography/geography.module';
-import { CreateAdService } from './core/application/commands/create-ad/create-ad.service';
-import { MatchGrpcController } from './interface/grpc-controllers/match.grpc-controller';
-import { MatchQueryHandler } from './core/application/queries/match/match.query-handler';
-import { TimezoneFinder } from './infrastructure/timezone-finder';
-import { TimeConverter } from './infrastructure/time-converter';
-import { InputDateTimeTransformer } from './infrastructure/input-datetime-transformer';
-import { MatchMapper } from './match.mapper';
-import { OutputDateTimeTransformer } from './infrastructure/output-datetime-transformer';
-import { MatchingRepository } from './infrastructure/matching.repository';
-import { MatchingMapper } from './matching.mapper';
+import { PostgresDirectionEncoder } from '@modules/geography/infrastructure/postgres-direction-encoder';
 import { CacheModule } from '@nestjs/cache-manager';
+import { Module, Provider } from '@nestjs/common';
 import { ConfigModule, ConfigService } from '@nestjs/config';
-import { redisStore } from 'cache-manager-ioredis-yet';
+import { CqrsModule } from '@nestjs/cqrs';
+import { ClientsModule, Transport } from '@nestjs/microservices';
 import {
   RedisClientOptions,
   RedisModule,
   RedisModuleOptions,
 } from '@songkeys/nestjs-redis';
-import { ConfigurationRepository } from '@mobicoop/configuration-module';
-import { PublishMessageWhenMatcherAdIsCreatedDomainEventHandler } from './core/application/event-handlers/publish-message-when-matcher-ad-is-created.domain-event-handler';
-import { Georouter } from './infrastructure/georouter';
-import { ClientsModule, Transport } from '@nestjs/microservices';
 import { GRPC_GEOGRAPHY_PACKAGE_NAME } from '@src/app.constants';
+import { redisStore } from 'cache-manager-ioredis-yet';
 import { join } from 'path';
+import {
+  AD_CONFIGURATION_REPOSITORY,
+  AD_DIRECTION_ENCODER,
+  AD_MESSAGE_PUBLISHER,
+  AD_REPOSITORY,
+  AD_ROUTE_PROVIDER,
+  GEOGRAPHY_PACKAGE,
+  INPUT_DATETIME_TRANSFORMER,
+  MATCHING_REPOSITORY,
+  OUTPUT_DATETIME_TRANSFORMER,
+  TIMEZONE_FINDER,
+  TIME_CONVERTER,
+} from './ad.di-tokens';
+import { AdMapper } from './ad.mapper';
+import { CreateAdService } from './core/application/commands/create-ad/create-ad.service';
+import { DeleteAdService } from './core/application/commands/delete-ad/delete-ad.service';
+import { PublishMessageWhenMatcherAdIsCreatedDomainEventHandler } from './core/application/event-handlers/publish-message-when-matcher-ad-is-created.domain-event-handler';
+import { MatchQueryHandler } from './core/application/queries/match/match.query-handler';
+import { AdRepository } from './infrastructure/ad.repository';
+import { Georouter } from './infrastructure/georouter';
+import { InputDateTimeTransformer } from './infrastructure/input-datetime-transformer';
+import { MatchingRepository } from './infrastructure/matching.repository';
+import { OutputDateTimeTransformer } from './infrastructure/output-datetime-transformer';
+import { PrismaService } from './infrastructure/prisma.service';
+import { TimeConverter } from './infrastructure/time-converter';
+import { TimezoneFinder } from './infrastructure/timezone-finder';
+import { MatchGrpcController } from './interface/grpc-controllers/match.grpc-controller';
+import { AdCreatedMessageHandler } from './interface/message-handlers/ad-created.message-handler';
+import { AdDeletedMessageHandler } from './interface/message-handlers/ad-deleted.message-handler';
+import { MatchMapper } from './match.mapper';
+import { MatchingMapper } from './matching.mapper';
 
 const imports = [
   CqrsModule,
@@ -96,13 +98,13 @@ const imports = [
 
 const grpcControllers = [MatchGrpcController];
 
-const messageHandlers = [AdCreatedMessageHandler];
+const messageHandlers = [AdCreatedMessageHandler, AdDeletedMessageHandler];
 
 const eventHandlers: Provider[] = [
   PublishMessageWhenMatcherAdIsCreatedDomainEventHandler,
 ];
 
-const commandHandlers: Provider[] = [CreateAdService];
+const commandHandlers: Provider[] = [CreateAdService, DeleteAdService];
 
 const queryHandlers: Provider[] = [MatchQueryHandler];
 

src/modules/ad/core/application/commands/delete-ad/delete-ad.command.ts

@@ -0,0 +1,7 @@
+import { Command, CommandProps } from '@mobicoop/ddd-library';
+
+export class DeleteAdCommand extends Command {
+  constructor(props: CommandProps<DeleteAdCommand>) {
+    super(props);
+  }
+}

src/modules/ad/core/application/commands/delete-ad/delete-ad.service.ts

@@ -0,0 +1,18 @@
+import { AD_REPOSITORY } from '@modules/ad/ad.di-tokens';
+import { Inject } from '@nestjs/common';
+import { CommandHandler, ICommandHandler } from '@nestjs/cqrs';
+import { AdRepositoryPort } from '../../ports/ad.repository.port';
+import { DeleteAdCommand } from './delete-ad.command';
+
+@CommandHandler(DeleteAdCommand)
+export class DeleteAdService implements ICommandHandler {
+  constructor(
+    @Inject(AD_REPOSITORY) private readonly adRepository: AdRepositoryPort,
+  ) {}
+
+  async execute(command: DeleteAdCommand): Promise<boolean> {
+    const ad = await this.adRepository.findOneById(command.id);
+    ad.delete();
+    return this.adRepository.delete(ad);
+  }
+}

src/modules/ad/core/domain/ad.entity.ts

@@ -1,5 +1,6 @@
-import { AggregateRoot, AggregateID } from '@mobicoop/ddd-library';
+import { AggregateID, AggregateRoot } from '@mobicoop/ddd-library';
 import { AdProps, CreateAdProps } from './ad.types';
+import { AdDeletedDomainEvent } from './events/ad-delete.domain-event';
 import { MatcherAdCreatedDomainEvent } from './events/matcher-ad-created.domain-event';
 
 export class AdEntity extends AggregateRoot<AdProps> {
@@ -26,6 +27,14 @@ export class AdEntity extends AggregateRoot<AdProps> {
     return ad;
   };
 
+  delete(): void {
+    this.addEvent(
+      new AdDeletedDomainEvent({
+        aggregateId: this.id,
+      }),
+    );
+  }
+
   validate(): void {
     // entity business rules validation to protect it's invariant before saving entity to a database
   }

src/modules/ad/core/domain/candidate.entity.ts

@@ -2,12 +2,14 @@ import {
   AggregateID,
   AggregateRoot,
   ArgumentInvalidException,
+  ValueObject,
 } from '@mobicoop/ddd-library';
 import { Role } from './ad.types';
 import { CalendarTools } from './calendar-tools.service';
 import {
   CandidateProps,
   CreateCandidateProps,
+  DateInterval,
   Target,
 } from './candidate.types';
 import { ActorTime } from './value-objects/actor-time.value-object';
@@ -101,57 +103,13 @@ export class CandidateEntity extends AggregateRoot<CandidateProps> {
    * Create the driver schedule based on the passenger schedule
    */
   private _createDriverSchedule = (): void => {
-    let driverSchedule: Array<ScheduleItemProps | undefined> =
-      this.props.passengerSchedule!.map(
-        (scheduleItemProps: ScheduleItemProps) => ({
-          day: scheduleItemProps.day,
-          time: scheduleItemProps.time,
-          margin: scheduleItemProps.margin,
-        }),
-      );
-    // adjust the driver theoretical schedule :
-    // we guess the ideal driver departure time based on the duration to
-    // reach the passenger starting point from the driver starting point
-    driverSchedule = driverSchedule
-      .map((scheduleItemProps: ScheduleItemProps) => {
-        try {
-          const driverDate: Date = CalendarTools.firstDate(
-            scheduleItemProps.day,
-            this.props.dateInterval,
-          );
-          const driverStartDatetime: Date = CalendarTools.datetimeWithSeconds(
-            driverDate,
-            scheduleItemProps.time,
-            -this._passengerStartDuration(),
-          );
-          return <ScheduleItemProps>{
-            day: driverDate.getUTCDay(),
-            margin: scheduleItemProps.margin,
-            time: `${driverStartDatetime
-              .getUTCHours()
-              .toString()
-              .padStart(2, '0')}:${driverStartDatetime
-              .getUTCMinutes()
-              .toString()
-              .padStart(2, '0')}`,
-          };
-        } catch (e) {
-          // no possible driver date or time
-          // TODO : find a test case !
-          return undefined;
-        }
-      })
-      .filter(
-        (scheduleItemProps: ScheduleItemProps | undefined) =>
-          scheduleItemProps !== undefined,
-      );
-    this.props.driverSchedule = driverSchedule.map(
-      (scheduleItemProps: ScheduleItemProps) => ({
-        day: scheduleItemProps.day,
-        time: scheduleItemProps.time,
-        margin: scheduleItemProps.margin,
-      }),
+    const passengerSchedule = new Schedule(
+      this.props.passengerSchedule!,
+      this.props.dateInterval,
     );
+    this.props.driverSchedule = passengerSchedule
+      .adjust(-this._passengerStartDuration())
+      .unpack().items;
   };
 
   /**
@@ -174,57 +132,14 @@ export class CandidateEntity extends AggregateRoot<CandidateProps> {
    * Create the passenger schedule based on the driver schedule
    */
   private _createPassengerSchedule = (): void => {
-    let passengerSchedule: Array<ScheduleItemProps | undefined> =
-      this.props.driverSchedule!.map(
-        (scheduleItemProps: ScheduleItemProps) => ({
-          day: scheduleItemProps.day,
-          time: scheduleItemProps.time,
-          margin: scheduleItemProps.margin,
-        }),
-      );
-    // adjust the passenger theoretical schedule :
-    // we guess the ideal passenger departure time based on the duration to
-    // reach the passenger starting point from the driver starting point
-    passengerSchedule = passengerSchedule
-      .map((scheduleItemProps: ScheduleItemProps) => {
-        try {
-          const passengerDate: Date = CalendarTools.firstDate(
-            scheduleItemProps.day,
-            this.props.dateInterval,
-          );
-          const passengeStartDatetime: Date = CalendarTools.datetimeWithSeconds(
-            passengerDate,
-            scheduleItemProps.time,
-            this._passengerStartDuration(),
-          );
-          return {
-            day: passengerDate.getUTCDay(),
-            margin: scheduleItemProps.margin,
-            time: `${passengeStartDatetime
-              .getUTCHours()
-              .toString()
-              .padStart(2, '0')}:${passengeStartDatetime
-              .getUTCMinutes()
-              .toString()
-              .padStart(2, '0')}`,
-          };
-        } catch (e) {
-          // no possible passenger date or time
-          // TODO : find a test case !
-          return undefined;
-        }
-      })
-      .filter(
-        (scheduleItemProps: ScheduleItemProps | undefined) =>
-          scheduleItemProps !== undefined,
-      );
-    this.props.passengerSchedule = passengerSchedule.map(
-      (scheduleItemProps: ScheduleItemProps) => ({
-        day: scheduleItemProps.day,
-        time: scheduleItemProps.time,
-        margin: scheduleItemProps.margin,
-      }),
+    const driverSchedule = new Schedule(
+      this.props.driverSchedule!,
+      this.props.dateInterval,
     );
+
+    this.props.passengerSchedule = driverSchedule
+      .adjust(this._passengerStartDuration())
+      .unpack().items;
   };
 
   private _createJourney = (driverScheduleItem: ScheduleItem): Journey =>
@@ -407,6 +322,60 @@ export class CandidateEntity extends AggregateRoot<CandidateProps> {
   }
 }
 
+//TODO Use this class as part of the CandidateEntity aggregate
+class Schedule extends ValueObject<{
+  items: ScheduleItemProps[];
+  dateInterval: DateInterval;
+}> {
+  constructor(items: ScheduleItemProps[], dateInterval: DateInterval) {
+    super({ items, dateInterval });
+  }
+
+  protected validate(): void {}
+
+  /**
+   * Add the given duration to each schedule item
+   * unless the expected new datetime is not possible,
+   * in which case the item is removed from the adjusted schedule
+   * @param duration time increment in seconds (can be negative)
+   * @returns the new adjusted schedule
+   */
+  adjust(duration: number): Schedule {
+    const newItems = this.props.items.reduce((acc, scheduleItemProps) => {
+      try {
+        const itemDate: Date = CalendarTools.firstDate(
+          scheduleItemProps.day,
+          this.props.dateInterval,
+        );
+        const driverStartDatetime: Date = CalendarTools.datetimeWithSeconds(
+          itemDate,
+          scheduleItemProps.time,
+          duration,
+        );
+        acc.push({
+          day: itemDate.getUTCDay(),
+          margin: scheduleItemProps.margin,
+          time: this._formatTime(driverStartDatetime),
+        });
+      } catch (e) {
+        // no possible driver date or time
+        // TODO : find a test case !
+      }
+      return acc;
+    }, new Array<ScheduleItemProps>());
+
+    return new Schedule(newItems, this.props.dateInterval);
+  }
+
+  private _formatTime(dateTime: Date) {
+    return (
+      dateTime.getUTCHours().toString().padStart(2, '0') +
+      ':' +
+      dateTime.getUTCMinutes().toString().padStart(2, '0')
+    );
+  }
+}
+
 type ScheduleItemRange = {
   scheduleItem: ScheduleItem;
   range: Date[];

src/modules/ad/core/domain/events/ad-delete.domain-event.ts

@@ -0,0 +1,7 @@
+import { DomainEvent, DomainEventProps } from '@mobicoop/ddd-library';
+
+export class AdDeletedDomainEvent extends DomainEvent {
+  constructor(props: DomainEventProps<AdDeletedDomainEvent>) {
+    super(props);
+  }
+}

src/modules/ad/interface/message-handlers/ad-deleted.message-handler.ts

@@ -0,0 +1,32 @@
+import { RabbitSubscribe } from '@mobicoop/message-broker-module';
+import { DeleteAdCommand } from '@modules/ad/core/application/commands/delete-ad/delete-ad.command';
+import { Injectable } from '@nestjs/common';
+import { CommandBus } from '@nestjs/cqrs';
+import {
+  AD_DELETED_MESSAGE_HANDLER,
+  AD_DELETED_ROUTING_KEY,
+} from '@src/app.constants';
+import { AdReference } from './ad.types';
+
+@Injectable()
+export class AdDeletedMessageHandler {
+  constructor(private readonly commandBus: CommandBus) {}
+
+  @RabbitSubscribe({
+    name: AD_DELETED_MESSAGE_HANDLER,
+    routingKey: AD_DELETED_ROUTING_KEY,
+  })
+  public async adDeleted(message: string): Promise<void> {
+    try {
+      const deletedAd: AdReference = JSON.parse(message);
+      await this.commandBus.execute(
+        new DeleteAdCommand({
+          id: deletedAd.aggregateId,
+        }),
+      );
+    } catch (error: any) {
+      // do not throw error to acknowledge incoming message
+      // error handling should be done in the command handler, if relevant
+    }
+  }
+}

src/modules/ad/interface/message-handlers/ad.types.ts

@@ -1,7 +1,10 @@
 import { Frequency } from '@modules/ad/core/domain/ad.types';
 
-export type Ad = {
+export type AdReference = {
   aggregateId: string;
+};
+
+export type Ad = AdReference & {
   driver: boolean;
   passenger: boolean;
   frequency: Frequency;

src/modules/ad/tests/unit/core/ad.entity.spec.ts

@@ -1,52 +1,17 @@
 import { AdEntity } from '@modules/ad/core/domain/ad.entity';
-import { CreateAdProps, Frequency } from '@modules/ad/core/domain/ad.types';
-import { PointProps } from '@modules/ad/core/domain/value-objects/point.value-object';
-
-const originPointProps: PointProps = {
-  lat: 48.689445,
-  lon: 6.17651,
-};
-const destinationPointProps: PointProps = {
-  lat: 48.8566,
-  lon: 2.3522,
-};
-
-const createAdProps: CreateAdProps = {
-  id: 'e8fe64b1-4c33-49e1-9f69-4db48b21df36',
-  driver: true,
-  passenger: true,
-  fromDate: '2023-06-21',
-  toDate: '2023-06-21',
-  schedule: [
-    {
-      day: 3,
-      time: '08:30',
-      margin: 900,
-    },
-  ],
-  frequency: Frequency.PUNCTUAL,
-  seatsProposed: 3,
-  seatsRequested: 1,
-  strict: false,
-  waypoints: [originPointProps, destinationPointProps],
-  driverDistance: 23000,
-  driverDuration: 900,
-  passengerDistance: 23000,
-  passengerDuration: 900,
-  fwdAzimuth: 283,
-  backAzimuth: 93,
-  points: [],
-};
+import { createAdProps } from './ad.fixtures';
 
 describe('Ad entity create', () => {
-  it('should create a new entity', async () => {
-    const ad: AdEntity = AdEntity.create(createAdProps);
-    expect(ad.id.length).toBe(36);
-    expect(ad.getProps().schedule.length).toBe(1);
-    expect(ad.getProps().schedule[0].day).toBe(3);
-    expect(ad.getProps().schedule[0].time).toBe('08:30');
-    expect(ad.getProps().driver).toBeTruthy();
-    expect(ad.getProps().passenger).toBeTruthy();
-    expect(ad.getProps().driverDistance).toBe(23000);
+  describe('create', () => {
+    it('should create a new entity', async () => {
+      const ad: AdEntity = AdEntity.create(createAdProps());
+      expect(ad.id.length).toBe(36);
+      expect(ad.getProps().schedule.length).toBe(1);
+      expect(ad.getProps().schedule[0].day).toBe(3);
+      expect(ad.getProps().schedule[0].time).toBe('08:30');
+      expect(ad.getProps().driver).toBeTruthy();
+      expect(ad.getProps().passenger).toBeTruthy();
+      expect(ad.getProps().driverDistance).toBe(23000);
+    });
   });
 });

src/modules/ad/tests/unit/core/ad.fixtures.ts

@@ -0,0 +1,40 @@
+import { CreateAdProps, Frequency } from '@modules/ad/core/domain/ad.types';
+import { PointProps } from '@modules/ad/core/domain/value-objects/point.value-object';
+
+const originPointProps: PointProps = {
+  lat: 48.689445,
+  lon: 6.17651,
+};
+const destinationPointProps: PointProps = {
+  lat: 48.8566,
+  lon: 2.3522,
+};
+
+export function createAdProps(): CreateAdProps {
+  return {
+    id: 'e8fe64b1-4c33-49e1-9f69-4db48b21df36',
+    driver: true,
+    passenger: true,
+    fromDate: '2023-06-21',
+    toDate: '2023-06-21',
+    schedule: [
+      {
+        day: 3,
+        time: '08:30',
+        margin: 900,
+      },
+    ],
+    frequency: Frequency.PUNCTUAL,
+    seatsProposed: 3,
+    seatsRequested: 1,
+    strict: false,
+    waypoints: [originPointProps, destinationPointProps],
+    driverDistance: 23000,
+    driverDuration: 900,
+    passengerDistance: 23000,
+    passengerDuration: 900,
+    fwdAzimuth: 283,
+    backAzimuth: 93,
+    points: [],
+  };
+}

src/modules/ad/tests/unit/core/delete-ad.service.spec.ts

@@ -0,0 +1,41 @@
+import { AD_REPOSITORY } from '@modules/ad/ad.di-tokens';
+import { DeleteAdCommand } from '@modules/ad/core/application/commands/delete-ad/delete-ad.command';
+import { DeleteAdService } from '@modules/ad/core/application/commands/delete-ad/delete-ad.service';
+import { AdEntity } from '@modules/ad/core/domain/ad.entity';
+import { Test, TestingModule } from '@nestjs/testing';
+import { createAdProps } from './ad.fixtures';
+
+const ad: AdEntity = AdEntity.create(createAdProps());
+const mockAdRepository = {
+  findOneById: jest.fn().mockImplementation(() => ad),
+  delete: jest.fn(),
+};
+
+describe('DeleteAdService', () => {
+  let deleteAdService: DeleteAdService;
+
+  beforeAll(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        {
+          provide: AD_REPOSITORY,
+          useValue: mockAdRepository,
+        },
+        DeleteAdService,
+      ],
+    }).compile();
+
+    deleteAdService = module.get<DeleteAdService>(DeleteAdService);
+  });
+
+  it('should be defined', () => {
+    expect(deleteAdService).toBeDefined();
+  });
+
+  it('should execute the delete logic and delete the ad from the repository', async () => {
+    jest.spyOn(ad, 'delete');
+    await deleteAdService.execute(new DeleteAdCommand(ad.id));
+    expect(ad.delete).toHaveBeenCalled();
+    expect(mockAdRepository.delete).toHaveBeenCalledWith(ad);
+  });
+});

src/modules/ad/tests/unit/interface/ad-deleted.message-handler.spec.ts

@@ -0,0 +1,44 @@
+import { AdDeletedMessageHandler } from '@modules/ad/interface/message-handlers/ad-deleted.message-handler';
+import { CommandBus } from '@nestjs/cqrs';
+import { Test, TestingModule } from '@nestjs/testing';
+
+const adDeletedMessage =
+  '{"aggregateId":"4eb6a6af-ecfd-41c3-9118-473a507014d4"}';
+
+const mockCommandBus = {
+  execute: jest.fn(),
+};
+
+describe('Ad Deleted Message Handler', () => {
+  let adDeletedMessageHandler: AdDeletedMessageHandler;
+
+  beforeAll(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        {
+          provide: CommandBus,
+          useValue: mockCommandBus,
+        },
+        AdDeletedMessageHandler,
+      ],
+    }).compile();
+
+    adDeletedMessageHandler = module.get<AdDeletedMessageHandler>(
+      AdDeletedMessageHandler,
+    );
+  });
+
+  afterEach(async () => {
+    jest.clearAllMocks();
+  });
+
+  it('should be defined', () => {
+    expect(adDeletedMessageHandler).toBeDefined();
+  });
+
+  it('should call the delete command', async () => {
+    jest.spyOn(mockCommandBus, 'execute');
+    await adDeletedMessageHandler.adDeleted(adDeletedMessage);
+    expect(mockCommandBus.execute).toHaveBeenCalledTimes(1);
+  });
+});

src/modules/messager/messager.module.ts

@@ -1,17 +1,20 @@
-import { Module, Provider } from '@nestjs/common';
-import { MESSAGE_PUBLISHER } from './messager.di-tokens';
 import {
   MessageBrokerModule,
   MessageBrokerModuleOptions,
   MessageBrokerPublisher,
 } from '@mobicoop/message-broker-module';
+import { Module, Provider } from '@nestjs/common';
 import { ConfigModule, ConfigService } from '@nestjs/config';
 import {
   AD_CREATED_MESSAGE_HANDLER,
   AD_CREATED_QUEUE,
   AD_CREATED_ROUTING_KEY,
+  AD_DELETED_MESSAGE_HANDLER,
+  AD_DELETED_QUEUE,
+  AD_DELETED_ROUTING_KEY,
   SERVICE_NAME,
 } from '@src/app.constants';
+import { MESSAGE_PUBLISHER } from './messager.di-tokens';
 
 const imports = [
   MessageBrokerModule.forRootAsync({
@@ -33,6 +36,10 @@ const imports = [
           routingKey: AD_CREATED_ROUTING_KEY,
           queue: AD_CREATED_QUEUE,
         },
+        [AD_DELETED_MESSAGE_HANDLER]: {
+          routingKey: AD_DELETED_ROUTING_KEY,
+          queue: AD_DELETED_QUEUE,
+        },
       },
     }),
   }),