tns test fails with error "ReferenceError: Can't find variable: Zone"

首先，使用为 CLI、模块和运行时列出的版本，重现报告的 tns 测试失败。阅读 error.service.test.ts 和 error.service.ts，重点关注 beforeEach() 中的 Angular 测试注入。完成的标准是服务测试在 iOS 和 Android 上都能运行，且不会出现关于 Zone 的 ReferenceError。

Tell us about the problem

Please, ensure your title is less than 63 characters long and starts with a capital
letter.

Which platform(s) does your issue occur on?

iOS, Android

Please provide the following version numbers that your issue occurs with:

• CLI: (run tns --version to fetch it)
  3.4.0

• Cross-platform modules: (check the 'version' attribute in the
  node_modules/tns-core-modules/package.json file in your project)
  3.3.0

• Runtime(s): (look for the "tns-android" and "tns-ios" properties in the
  package.json file of your project)
  3.0.0

Please tell us how to recreate the issue in as much detail as possible.

• Build a service that requires injection of TranslateService (from ng-translate)
• Inject that service in beforeEach() of a test suite.

Is there code involved? If so, please share the minimal amount of code needed to recreate the problem.

error.service.test.ts

'use strict';

import {ErrorService} from '../services/error.service';
import {inject} from "@angular/core/testing";

declare let assert: Chai.AssertStatic;

describe("ErrorService tests", () => {

    let service = null;

    beforeEach((done) => {
        inject([ErrorService], (injectService: ErrorService) => {
            service = injectService;
            done();
        });
    });

    it("Service exists", (done) => {
        assert.exists(service);
        done();
    });

});

error.service.ts

import { Injectable } from "@angular/core";
import { TranslateService } from "ng2-translate";

@Injectable()
export class ErrorService {

    constructor(private i18n: TranslateService) {
    }
}