bugfix(ws/microservices): add catchError() to observables

integration/websockets/e2e/error-gateway.spec.ts

@@ -0,0 +1,35 @@
+import { INestApplication } from '@nestjs/common';
+import { Test } from '@nestjs/testing';
+import { expect } from 'chai';
+import * as io from 'socket.io-client';
+import { ErrorGateway } from '../src/error.gateway';
+
+describe('ErrorGateway', () => {
+  let app: INestApplication;
+
+  beforeEach(async () => {
+    const testingModule = await Test.createTestingModule({
+      providers: [ErrorGateway],
+    }).compile();
+    app = await testingModule.createNestApplication();
+    await app.listenAsync(3000);
+  });
+
+  it(`should handle error`, async () => {
+    const ws = io.connect('http://localhost:8080');
+    ws.emit('push', {
+      test: 'test',
+    });
+    await new Promise(resolve =>
+      ws.on('exception', data => {
+        expect(data).to.be.eql({
+          status: 'error',
+          message: 'test',
+        });
+        resolve();
+      }),
+    );
+  });
+
+  afterEach(() => app.close());
+});