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domain-events-broker.test.ts
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domain-events-broker.test.ts
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import {
AbstractDomainEvent,
IDomainEvent,
IEventConstructorContext,
} from './domain-event';
/* provide a basic example event; no additional data */
class PrimaryStubEvent extends AbstractDomainEvent {}
class SecondaryStubEvent extends AbstractDomainEvent {}
const stubEventContext: IEventConstructorContext = {
aggregateId: '',
tenantId: '',
};
describe('Aggregate DomainEvents', () => {
beforeEach(() => {
// Even though we use `.doMock` which should act locally, Jest is still holding some
// external state somewhere which seems to only be cleared with this call.
jest.unmock('./domain-events-broker');
});
it('can register events for a single Aggregate', async () => {
jest.doMock('./domain-events-broker');
const { AggregateRoot } = await import('./aggregate-root');
const { DomainEventsBroker } = await import('./domain-events-broker');
class RegisterSingleEventTestAggregate extends AggregateRoot {
public addEvent(event: IDomainEvent): void {
this.addDomainEvent(event);
}
}
const myEvent = new PrimaryStubEvent(stubEventContext);
const myAggregrate = new RegisterSingleEventTestAggregate({
id: '1',
tenantId: '1',
});
myAggregrate.addEvent(myEvent);
expect(myAggregrate.domainEvents).toHaveLength(1);
expect(DomainEventsBroker.registerAggregate).toHaveBeenCalledTimes(1);
});
it('can register events for multiple Aggregates at the same time', async () => {
jest.doMock('./domain-events-broker');
const { AggregateRoot } = await import('./aggregate-root');
const { DomainEventsBroker } = await import('./domain-events-broker');
class RegisterMultpleEventTestAggregateA extends AggregateRoot {
public addEvent(event: IDomainEvent): void {
this.addDomainEvent(event);
}
}
class RegisterMultpleEventTestAggregateB extends RegisterMultpleEventTestAggregateA {}
const myEventA = new PrimaryStubEvent(stubEventContext);
const myEventB = new PrimaryStubEvent(stubEventContext);
const aggregateA = new RegisterMultpleEventTestAggregateA({
id: '1',
tenantId: '1',
});
const aggregateB = new RegisterMultpleEventTestAggregateB({
id: '2',
tenantId: '2',
});
aggregateA.addEvent(myEventA);
aggregateB.addEvent(myEventB);
expect(aggregateA.domainEvents).toHaveLength(1);
expect(aggregateB.domainEvents).toHaveLength(1);
expect(DomainEventsBroker.registerAggregate).toHaveBeenCalledTimes(2);
});
it('drains the event queue once the events have been dispatched', async () => {
const { AggregateRoot } = await import('./aggregate-root');
const { DomainEventsBroker } = await import('./domain-events-broker');
class RegisterSingleEventTestAggregate extends AggregateRoot {
public addEvent(event: IDomainEvent): void {
this.addDomainEvent(event);
}
}
const myEventA = new PrimaryStubEvent(stubEventContext);
const myEventB = new SecondaryStubEvent(stubEventContext);
const myAggregrate = new RegisterSingleEventTestAggregate({
id: '1',
tenantId: '1',
});
myAggregrate.addEvent(myEventA);
myAggregrate.addEvent(myEventB);
expect(myAggregrate.domainEvents).toHaveLength(2);
DomainEventsBroker.dispatchAggregateEvents(myAggregrate);
expect(myAggregrate.domainEvents).toHaveLength(0);
});
it('can dispatch registered events for a given Aggregate', async () => {
const { AggregateRoot } = await import('./aggregate-root');
const { DomainEventsBroker } = await import('./domain-events-broker');
class DispatchEventsTestAggregate extends AggregateRoot {
public addEvent(event: IDomainEvent): void {
this.addDomainEvent(event);
}
}
const myEvent = new PrimaryStubEvent(stubEventContext);
const myAggregrate = new DispatchEventsTestAggregate({
id: '1',
tenantId: '1',
});
const eventHandler = jest.fn();
DomainEventsBroker.registerEventHandler(
PrimaryStubEvent.name,
eventHandler,
);
myAggregrate.addEvent(myEvent);
DomainEventsBroker.dispatchAggregateEvents(myAggregrate);
expect(eventHandler).toHaveBeenCalledTimes(1);
});
it('sends dispatched events to multiple subscribed event handlers', async () => {
const { AggregateRoot } = await import('./aggregate-root');
const { DomainEventsBroker } = await import('./domain-events-broker');
class DispatchEventsTestAggregateA extends AggregateRoot {
public addEvent(event: IDomainEvent): void {
this.addDomainEvent(event);
}
}
const myEventA = new PrimaryStubEvent(stubEventContext);
const myAggregrateA = new DispatchEventsTestAggregateA({
id: '1',
tenantId: '1',
});
const eventHandlerA = jest.fn();
const eventHandlerB = jest.fn();
myAggregrateA.addEvent(myEventA);
DomainEventsBroker.registerEventHandler(
PrimaryStubEvent.name,
eventHandlerA,
);
DomainEventsBroker.registerEventHandler(
PrimaryStubEvent.name,
eventHandlerB,
);
DomainEventsBroker.dispatchAggregateEvents(myAggregrateA);
expect(eventHandlerA).toHaveBeenCalledTimes(1);
expect(eventHandlerB).toHaveBeenCalledTimes(1);
});
it('does not leak registered events across Aggregate boundaries', async () => {
const { AggregateRoot } = await import('./aggregate-root');
const { DomainEventsBroker } = await import('./domain-events-broker');
class DispatchEventsTestAggregateA extends AggregateRoot {
public addEvent(event: IDomainEvent): void {
this.addDomainEvent(event);
}
}
class DispatchEventsTestAggregateB extends DispatchEventsTestAggregateA {}
const myEventA = new PrimaryStubEvent(stubEventContext);
const myEventB = new SecondaryStubEvent(stubEventContext);
const myAggregrateA = new DispatchEventsTestAggregateA({
id: '1',
tenantId: '1',
});
const myAggregrateB = new DispatchEventsTestAggregateB({
id: '2',
tenantId: '2',
});
const eventHandlerA = jest.fn();
const eventHandlerB = jest.fn();
myAggregrateA.addEvent(myEventA);
myAggregrateB.addEvent(myEventB);
DomainEventsBroker.registerEventHandler(
PrimaryStubEvent.name,
eventHandlerA,
);
DomainEventsBroker.registerEventHandler(
SecondaryStubEvent.name,
eventHandlerB,
);
// Only dispatch events for a single Aggregate
DomainEventsBroker.dispatchAggregateEvents(myAggregrateA);
// Events attached to the dispatched Aggregate should have been invoked
expect(eventHandlerA).toHaveBeenCalledTimes(1);
// Events attached to the NON-dispatched Aggregate should NOT have been invoked
expect(eventHandlerB).toHaveBeenCalledTimes(0);
});
});