message: chore(never): convert never specs to run mode
diff: +/** @prettier */
  import { NEVER } from 'rxjs';
  import { expect } from 'chai';
  -import { expectObservable } from '../helpers/marble-testing';
  +import { TestScheduler } from 'rxjs/testing';
  +import { observableMatcher } from '../helpers/observableMatcher';
  /** @test {NEVER} */
  describe('NEVER', () => {
  + let rxTestScheduler: TestScheduler;
  +
  + beforeEach(() => {
  + rxTestScheduler = new TestScheduler(observableMatcher);
  + });
  +
  it('should create a cold observable that never emits', () => {
  + rxTestScheduler.run(({ expectObservable }) => {
  const expected = '-';
  const e1 = NEVER;
  expectObservable(e1).toBe(expected);
  });
  + });
  it('should return the same instance every time', () => {
  expect(NEVER).to.equal(NEVER);
  