How to test gateways containing exception filters in e2e testing

Problem

Exception filters does not seem to be used at all when doing E2E testing on a gateway

Code

some-gateway.e2e-spec.ts

import { INestApplication } from '@nestjs/common';
import { Test } from '@nestjs/testing';

import { AppModule } from '@/app.module';
import { SomeGateway } from './some.gateway';

describe('SomeGateway', () => {
    let app: INestApplication;
    let someGateway: SomeGateway;
    const mockClient = {
        emit: jest.fn(),
    };

    beforeAll(async () => {
        const moduleFixture = await Test.createTestingModule({
            imports: [AppModule],
        }).compile();

        app = moduleFixture.createNestApplication();
        await app.init();

        someGateway = app.get(SomeGateway);
    });

    afterAll(async () => {
        await app.close();
    });

    beforeEach(() => {
        jest.resetAllMocks();
    });

    describe('someEventListener', () => {
        it('does not throw an exception because I have a exception filter', async (done) => {

            await someGateway.someEventListener(
                mockClient
            );

            expect(mockClient.emit).toHaveBeenCalled();
            done();
        });
    });
});

some-gateway.ts

import { SomeExceptionFilter } from './some-exception-filter';
import { UseFilters } from '@nestjs/common';
import {
    SubscribeMessage,
    WebSocketGateway,
} from '@nestjs/websockets';

@UseFilters(new SomeExceptionFilter())
@WebSocketGateway({ namespace: 'robot-fleetbridge' })
export class SomeGateway {

    @SubscribeMessage('some-event')
    async someEventListener(client): Promise<void> {
        throw new Error();
    }
}

some-exception-filter.ts

import { ArgumentsHost, Catch } from '@nestjs/common';

@Catch()
export class SomeExceptionFilter {
    catch(exception: any, host: ArgumentsHost) {
        console.log('i should be called :(');

        const client = host.switchToWs().getClient();

        client.emit('exception', { message: 'not ok' });
    }
}

Some thoughts

maybe I should use app.getHttpServer() to be able to make it work, but how to simulate a socket.io connection using supertest?