NativeScript - unit tests throwing errors

I'm writing an app with NativeScript 6+ and Angular 8+. I'm trying to write some unit tests for my services with karma and jasmine. My unit tests are throwing errors.

How can I write my unit tests properly? I read and followed the directions on this web page but it still doesn't work: https://docs.nativescript.org/angular/tooling/testing/testing

karma.config.js

// list of files / patterns to load in the browser
files: [
  'src/tests/setup.ts',
  'src/tests/**/*.spec.ts'
],

test

import {
  nsTestBedAfterEach,
  nsTestBedBeforeEach,
  nsTestBedRender
} from 'nativescript-angular/testing';

import { HttpInterceptorService } from '../app/core/interceptors/http-interceptor-service';

describe('HttpInterceptorService', () => {

  beforeEach(nsTestBedBeforeEach([HttpInterceptorService]));
  afterEach(nsTestBedAfterEach(false));

  it('should be created', () => {
  });

  it('should have its functions defined', () => {
  });

});

Error:

NativeScript / 13.3 (13.3; iPad): Executed 15 of 17 SUCCESS (0 secs / 0.018 secs)
NativeScript / 13.3 (13.3; iPad)  undefined at line undefined FAILED
    An error was thrown in afterAll
    TypeError: undefined is not an object (evaluating 'window.location.origin') (line 108)
        at <Jasmine>
    at file:///app/vendor.js:157139:46
        at <Jasmine>
    at file:///app/vendor.js:157341:57
        at <Jasmine>
    at file:///app/bundle.js:1389:28
        at <Jasmine>
    TypeError: undefined is not an object (evaluating 'window.location.origin') (line 108)
        at <Jasmine>
    at file:///app/vendor.js:157139:46
        at <Jasmine>
    at file:///app/vendor.js:157341:57
        at <Jasmine>
    at file:///app/bundle.js:1389:28
        at <Jasmine>
NativeScript / 13.3 (13.3; iPad): Executed 16 of 17 (1 FAILED) (0.084 secs / 0.018 secs)
TOTAL: 1 FAILED, 15 SUCCESS
CONSOLE LOG file:///node_modules/nativescript-unit-test-runner/app/main-view-model.js:132:0: NSUTR: this.error: An error was thrown in afterAll
TypeError: undefined is not an object (evaluating 'window.location.origin') (line 108)
at <Jasmine>
at file:///node_modules/nativescript-angular/zone-js/dist/zone-nativescript.jasmine.js:1445:0
at <Jasmine>
at file:///node_modules/nativescript-angular/zone-js/dist/zone-nativescript.js:188:0
at <Jasmine>
at file:///src/main.ts:11:16
at <Jasmine>
TypeError: undefined is not an object (evaluating 'window.location.origin') (line 108)
at <Jasmine>
at file:///node_modules/nativescript-angular/zone-js/dist/zone-nativescript.jasmine.js:1445:0
at <Jasmine>
at file:///node_modules/nativescript-angular/zone-js/dist/zone-nativescript.js:188:0
at <Jasmine>
at file:///src/main.ts:11:16
at <Jasmine>
CONSOLE LOG file:///node_modules/nativescript-unit-test-runner/app/main-view-model.js:120:0: NSUTR: completed test run.
CONSOLE LOG file:///node_modules/nativescript-unit-test-runner/app/main-view-model.js:120:0: NSUTR: completed test run.
CONSOLE LOG file:///node_modules/nativescript-unit-test-runner/app/main-view-model.js:124:0: NSUTR: completeAck
CONSOLE LOG file:///node_modules/nativescript-unit-test-runner/app/main-view-model.js:124:0: NSUTR: completeAck
NativeScript / 13.3 (13.3; iPad) ERROR

Bắt đầu với karma.config.js, src/tests/setup.ts và spec của HttpInterceptorService được nêu trong báo cáo, sau đó tái hiện lần chạy test của NativeScript 6+/Angular 8+. Truy tìm lỗi afterAll liên quan đến window.location.origin và so sánh phần setup với tài liệu kiểm thử được liên kết. Được coi là hoàn tất khi test suite hoàn thành mà không gặp lỗi đó.