angular - 为什么我的单元测试在 Chrome 中通过而在 PhantomJS 中失败？

Question

我正在使用 Angular2 final (2.0.2) 和 angular-cli。 我正在尝试将其设置为使用 PhantomJS 运行单元测试。 使用 Chrome 和 karma-chrome-launcher 运行规范是有效的——所有测试都通过了。 使用 Phantomjs-prebuilt 2.1.13 和 karma-phantomjs-launcher 1.0.2 测试运行相同的测试失败。

我在 karma.conf 的插件数组中添加了 phantomjs 启动器，在浏览器数组中添加了 PahntomJS。

我得到的错误是:

PhantomJS 2.1.1 (Mac OS X 0.0.0) DataTableFormat should transform date in milliseconds FAILED ReferenceError: Can't find variable: Intl in src/main/js/test.ts (line 53565) intlDateFormat@webpack:///Users/sninio/dev/csp-ui/~/@angular/common/src/facade/intl.js:117:0 <- src/main/js/test.ts:53565:20 webpack:///Users/sninio/dev/csp-ui/~/@angular/common/src/facade/intl.js:148:36 <- src/main/js/test.ts:53596:59 dateFormatter@webpack:///Users/sninio/dev/csp-ui/~/@angular/common/src/facade/intl.js:157:0 <- src/main/js/test.ts:53605:39 format@webpack:///Users/sninio/dev/csp-ui/~/@angular/common/src/facade/intl.js:192:0 <- src/main/js/test.ts:53640:29 transform@webpack:///Users/sninio/dev/csp-ui/~/@angular/common/src/pipes/date_pipe.js:92:0 <- src/main/js/test.ts:70473:90 transform@webpack:///Users/sninio/dev/csp-ui/src/main/js/app/pages/+platform/events/data-table/data-table.pipe.ts:9:4418 <- src/main/js/test.ts:52698:5787 webpack:///Users/sninio/dev/csp-ui/src/main/js/app/pages/+platform/events/data-table/data-table.pipe.spec.ts:20:30 <- src/main/js/test.ts:60923:30 execute@webpack:///Users/sninio/dev/csp-ui/~/@angular/core/bundles/core-testing.umd.j <- src/main/js/test.ts:2997:28 webpack:///Users/sninio/dev/csp-ui/~/@angular/core/bundles/core-testing.umd.js:951:32 <- src/main/js/test.ts:3084:56 invoke@webpack:///Users/sninio/dev/csp-ui/~/zone.js/dist/zone.js:203:0 <- src/main/js/test.ts:98886:33 onInvoke@webpack:///Users/sninio/dev/csp-ui/~/zone.js/dist/proxy.js:72:0 <- src/main/js/test.ts:68790:45 invoke@webpack:///Users/sninio/dev/csp-ui/~/zone.js/dist/zone.js:202:0 <- src/main/js/test.ts:98885:42 run@webpack:///Users/sninio/dev/csp-ui/~/zone.js/dist/zone.js:96:0 <- src/main/js/test.ts:98779:49 webpack:///Users/sninio/dev/csp-ui/~/zone.js/dist/jasmine-patch.js:91:27 <- src/main/js/test.ts:68526:53 execute@webpack:///Users/sninio/dev/csp-ui/~/zone.js/dist/jasmine-patch.js:119:0 <- src/main/js/test.ts:68554:46 execute@webpack:///Users/sninio/dev/csp-ui/~/zone.js/dist/jasmine-patch.js:119:0 <- src/main/js/test.ts:68554:46 invokeTask@webpack:///Users/sninio/dev/csp-ui/~/zone.js/dist/zone.js:236:0 <- src/main/js/test.ts:98919:42 runTask@webpack:///Users/sninio/dev/csp-ui/~/zone.js/dist/zone.js:136:0 <- src/main/js/test.ts:98819:57 drainMicroTaskQueue@webpack:///Users/sninio/dev/csp-ui/~/zone.js/dist/zone.js:368:0 <- src/main/js/test.ts:99051:42 PhantomJS 2.1.1 (Mac OS X 0.0.0) DataTableFormat should transform date string FAILED

也许我在 angular-cli 创建的 test.ts 文件中缺少一些配置？

更新: 似乎只有导入 DatePipe 和 JsonPipe 失败的测试。
我还尝试在 test.ts 中导入 @angular/common/testing 但这无济于事 - 它们不会在相关的 index.js 中导出。
还尝试导入整个 @angular/common/pipes 但这也不起作用。

这是管道:

import { Pipe, PipeTransform } from "@angular/core";
import { DatePipe, JsonPipe } from "@angular/common";

@Pipe({name: 'dataTableFormat'})
export class DataTablePipe implements PipeTransform {

    // values with type 'json' are parsed to json. As a result, string values may be displayed with quotes ("<string>").
    // To avoid that, we remove these quotes with this regex
    private quotesExp: RegExp = /^\"|\"$/gi;

    constructor(private datePipe: DatePipe, private jsonPipe: JsonPipe) {

    }

    transform(value: any, type: string): string {
        switch (type) {
            case "date":
                return this.datePipe.transform(value, 'short');
            case "json":
                return this.jsonPipe.transform(value).replace(this.quotesExp, "");
            default:
                return value;
        }
    }
}

和规范:

import { inject, TestBed } from "@angular/core/testing";
import { DataTablePipe } from "./data-table.pipe";
import { DatePipe, JsonPipe } from "@angular/common";

describe('DataTableFormat', () => {

    beforeEach(() => {
        TestBed.configureTestingModule({
            providers: [
                DatePipe, JsonPipe
            ]
        });

    });

    it('should transform date in milliseconds', inject([DatePipe, JsonPipe], (datePipe, jsonPipe) => {
        let pipe = new DataTablePipe(datePipe, jsonPipe);
        let testDate: Date = new Date();

        expect(pipe.transform(testDate.getTime(), 'date')).toBe(datePipe.transform(testDate, 'short'));
    }));

    it('should transform date string', inject([DatePipe, JsonPipe], (datePipe, jsonPipe) => {
        let pipe = new DataTablePipe(datePipe, jsonPipe);
        let testDate: Date = new Date();

        expect(pipe.transform(testDate.toISOString(), 'date')).toBe(datePipe.transform(testDate, 'short'));
    }));

    it('should transform json', inject([DatePipe, JsonPipe], (datePipe, jsonPipe) => {
        let pipe = new DataTablePipe(datePipe, jsonPipe);
        let testJson = {
            prop1: "val1",
            prop2: "val2"
        };

        expect(pipe.transform(testJson, 'json')).toBe(jsonPipe.transform(testJson));
    }));

});

这是我的 test.ts 文件 - 与 angular-cli 生成的文件相比没有太大变化...

import "./polyfills.ts";
import "zone.js/dist/long-stack-trace-zone";
import "zone.js/dist/proxy.js";
import "zone.js/dist/sync-test";
import "zone.js/dist/jasmine-patch";
import "zone.js/dist/async-test";
import "zone.js/dist/fake-async-test";


// Unfortunately there's no typing for the `__karma__` variable. Just declare it as any.
declare var __karma__: any;
declare var require: any;

// Prevent Karma from running prematurely.
__karma__.loaded = function () {
};

//noinspection TypeScriptUnresolvedVariable
Promise.all([
    System.import('@angular/core/testing'),
    System.import('@angular/platform-browser-dynamic/testing'),
    System.import('../../../node_modules/nvd3/build/nv.d3.min.js'),
])
// First, initialize the Angular testing environment.
    .then(([testing, testingBrowser]) => {
        testing.getTestBed().initTestEnvironment(
            testingBrowser.BrowserDynamicTestingModule,
            testingBrowser.platformBrowserDynamicTesting()
        );
    })
    // Then we find all the tests.
    .then(() => require.context('./', true, /\.spec\.ts/))
    // And load the modules.
    .then(context => context.keys().map(context))
    // Finally, start Karma to run the tests.
    .then(__karma__.start, __karma__.error);

知道为什么这适用于 Chrome 而不是 PhantomJS 吗？

Answer 1

由于 PhantomJS 没有实现 Angular2 所依赖的 Intl 实现，解决方案是安装 npm 包 intl polyfill 并编辑 polyfills.ts 以包含

import 'intl';
import 'intl/locale-data/jsonp/en.js';

参见此处:https://github.com/angular/angular/issues/3333
这里:https://github.com/angular/angular/issues/10809
在这里:https://coryrylan.com/blog/adding-the-internationalization-polyfill-to-a-angular-cli-project