"Expected to be running in 'ProxyZone', but it was not found." 是

Question

我正在将带有 Karma 的 Angular 工作区迁移到带有 Jest 的 Nx 工作区。我有几个问题，其中之一是使用 fakeAsync，这会导致以下错误：

Expected to be running in 'ProxyZone', but it was not found.

因为我的应用程序使用了@ionic 和@ionic-native，所以我不得不搞了一堆恶作剧来搞笑。我认为这个问题与所说的恶作剧有关，但我设法做出了一种 -minimal repro here。以下是重要内容：

这是我的jest.preset.js.

const nxPreset = require('@nrwl/jest/preset');
module.exports = {
  ...nxPreset,
  testMatch: ['**/+(*.)+(spec|test).+(ts|js)?(x)'],
  transform: {
    '^.+\.(ts|js|html)$': 'ts-jest',
  },
  testEnvironment: 'jest-environment-jsdom-fourteen',
  resolver: '@nrwl/jest/plugins/resolver',
  moduleFileExtensions: ['ts', 'js', 'html'],
  coverageReporters: ['html'],
};

这是我的jest.config.js.

module.exports = {
  preset: '../../jest.preset.js',
  coverageDirectory: '../../coverage/apps/products',
  snapshotSerializers: [
    'jest-preset-angular/build/AngularNoNgAttributesSnapshotSerializer.js',
    'jest-preset-angular/build/AngularSnapshotSerializer.js',
    'jest-preset-angular/build/HTMLCommentSerializer.js',
  ],
  setupFilesAfterEnv: ['<rootDir>/src/test-setup.ts'],
  globals: {
    'ts-jest': {
      tsConfig: '<rootDir>/tsconfig.spec.json',
      stringifyContentPathRegex: '\.(html|svg)$',
      astTransformers: {
        before: [
          'jest-preset-angular/build/InlineFilesTransformer',
          'jest-preset-angular/build/StripStylesTransformer',
        ],
      },
    },
  },
  displayName: 'products',
};

最后，这是我的测试文件。

describe('AppComponent', () => {
  let fixture: ComponentFixture<AppComponent>;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [RouterTestingModule],
      declarations: [AppComponent],
      schemas: [CUSTOM_ELEMENTS_SCHEMA]
    }).compileComponents();
    fixture = TestBed.createComponent(AppComponent);

    fixture.detectChanges();
  }));

  // This test gives me an error.
  it('should create the app', fakeAsync(() => {
    const app = fixture.debugElement.componentInstance;
    expect(app).toBeTruthy();
  }));

  // This test passes.
  it(`should render the header`, () => {
    expect(
      fixture.nativeElement.querySelector('nx-example-header')
    ).toBeTruthy();
  });
});

最后，这里是测试-setup.ts.

import 'jest-preset-angular';
import 'document-register-element';
import 'zone.js/dist/zone-testing';

这个设置对我来说似乎很普通，我不确定问题出在哪一边（nx、jest、jest-preset-angular？）。

感谢您的帮助！

Answer 1

我设法通过从我的 test-setup.ts 文件中删除 import 'zone.js/dist/zone-testing'; 行来解决这个问题。我不确定为什么会修复它。我知道 jest-preset-angular patches describe/test 起作用，因此它们在 Zone.js 内工作。我想 zone.js/dist/zone-testing 覆盖了补丁之类的东西。

"Expected to be running in 'ProxyZone', but it was not found." 是

"Expected to be running in 'ProxyZone', but it was not found." with jest

angular

jestjs

nrwl-nx