angular - TypeError : this. _platformStrategy.getBaseHref不是函数

我正在尝试为我有很多导入内容的Angular 4/5组件创建单元测试。但是在导入LocationStrategy之后，我得到了:



当我从LocationStrategy导入@angular/common时显示。

有我的spec.ts文件:

student.component.spec.ts

import {TestBed, ComponentFixture, async} from '@angular/core/testing';
import {Observable} from 'rxjs/Observable';
import 'rxjs/add/observable/of';

import {StudentComponent} from './student.component';
import {StudentService} from './student.service';
import {Student} from './student';
import {RecordsCount} from '../shared/entities/recordsCount';
import {Group} from '../groups/group';
import {GroupsService} from '../groups/groups.service';
import {NO_ERRORS_SCHEMA} from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { HttpHandler } from '@angular/common/http';
import { OverlayModule } from '@angular/cdk/overlay';
import { MainMaterialModule } from '../main-material.module';
import { HttpClientTestingModule } from '@angular/common/http/testing';
import { UpdateDeleteEntityService } from '../entity-table/update-delete-entity.service';
import { InfoModalService } from '../info-modal/info-modal.service';
import { ActivatedRoute } from '@angular/router';
import { Location, LocationStrategy } from '@angular/common';

describe('StudentComponent', () => {
  let fixture: ComponentFixture<StudentComponent>;
  let component: StudentComponent;
  let mockRouter = {
    navigate: jasmine.createSpy('navigate')
  };

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [StudentComponent],
      schemas: [NO_ERRORS_SCHEMA],
      imports: [MainMaterialModule, HttpClientTestingModule],
      providers: [
        StudentService,
        GroupsService,
        InfoModalService,
        UpdateDeleteEntityService,
        Location,
        LocationStrategy,
        { provide: ActivatedRoute, useValue: mockRouter}]
    }).compileComponents();
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(StudentComponent);
    component = fixture.debugElement.componentInstance;
    fixture.detectChanges();
  });

  it('should return array of students', () => {
    const studentService = fixture.debugElement.injector.get(StudentService);
    fixture.detectChanges();
    const students: Student[] = [
      {
        userId: 20,
        gradebookId: 'UX-3311221',
        studentSurname: 'Лящовський',
        studentName: 'Андрій',
        studentFname: 'Іванович',
        groupId: '2',
        plainPassword: '',
        photo: ''
      }, {
        userId: 13,
        gradebookId: 'UY-3019273',
        studentSurname: 'Заник',
        studentName: 'Іван',
        studentFname: 'Григорович',
        groupId: '5',
        plainPassword: '',
        photo: ''
      }, {
        userId: 155,
        gradebookId: 'UT-1029384',
        studentSurname: 'Лінкольн',
        studentName: 'Абрагім',
        studentFname: 'Зимонсович',
        groupId: '1',
        plainPassword: '',
        photo: ''
    }];
    const recordsCount: RecordsCount = {
      numberOfRecords: '3'
    };
    const spy = spyOn(studentService, 'getStudentsRange').and.returnValue(Observable.of([students, recordsCount]));

    component.getStudents();

    expect(component.students).toEqual(students);
  });

});

最佳答案

您可能已经找到了解决此问题的方法，但以防万一，并且可以使遇到相同问题的其他任何人受益。我遇到此问题，发现以下解决方案有效:

我认为问题在于LocationStrategy是一个抽象类，您需要提供一个扩展LocationStrategy的具体类，例如PathLocationStrategy。我将以下内容添加到我的提供商列表中
{ provide: LocationStrategy, useClass: PathLocationStrategy },
然后，因为PathLocationStrategy依赖于APP_BASE_REF，所以我还为此添加了一个提供程序
{ provide: APP_BASE_HREF, useValue: '/my/app'}
APP_BASE_HREF和PathLocationStrategy与@Location和LocationStrategy相同，是从@ angular/common导入的

关于angular - TypeError : this. _platformStrategy.getBaseHref不是函数，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/47445810/