TypeError:this._platformStrategy.getBaseHref不是函数

Question

我正在尝试为我的Angular 4/5组件创建单元测试,我有很多进口.但是在导入LocationStrategy之后我得到了一个:

TypeError:this._platformStrategy.getBaseHref不是函数

当我LocationStrategy从中导入时显示@angular/common.

有我的spec.ts档案:

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: '??????????',
        studentName: '??????',
        studentFname: '????????',
        groupId: '2',
        plainPassword: '',
        photo: ''
      }, {
        userId: 13,
        gradebookId: 'UY-3019273',
        studentSurname: '?????',
        studentName: '????',
        studentFname: '??????????',
        groupId: '5',
        plainPassword: '',
        photo: ''
      }, {
        userId: 155,
        gradebookId: 'UT-1029384',
        studentSurname: '????????',
        studentName: '???????',
        studentFname: '??????????',
        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);
  });

});

Answer 1

您可能已经找到了解决方案,但以防万一,并且为了其他任何有相同问题的人的利益.我遇到了这个问题,发现以下解决方案有效:

我认为问题是LocationStrategy是一个抽象类,你需要提供一个扩展LocationStrategy的具体类,比如PathLocationStrategy.我在服务提供商列表中添加了以下内容

{ provide: LocationStrategy, useClass: PathLocationStrategy },

然后因为PathLocationStrategy依赖于APP_BASE_REF,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是从@ angular/common导入的,与Location和LocationStrategy相同