chai-test-scheduler.ts

import { TestScheduler } from 'rxjs';
import { TestMessage } from 'rxjs/testing/TestMessage';
import { expect } from 'chai';

export class ChaiTestScheduler extends TestScheduler {
  constructor() {
    super((a: TestMessage[], b: TestMessage[]) => {
      expect(a).to.eql(b);
      // exception type check
      for (let i = 0; i < a.length; i++) {
        if (a[i].notification.kind === 'E') {
          expect(a[i].notification.error).to.be.instanceOf(b[i].notification.error.constructor);
        }
      }
    });
  }
}