在Angular 8中进行ng测试时，karma控制台说；未捕获的SyntaxError:JSON中位于位置1的意外标记o抛出；

这是规范文件

...
...
import { AccountService } from 'src/app/core/account.service';
import accountsummary from 'src/app/core/model/mock-account-summary.json';
import transactions from 'src/app/core/model/mock-transaction-history.json';
import { AccountsummaryComponent } from './accountsummary.component';

describe('AccountsummaryComponent', () => {
  let component: AccountsummaryComponent;
  let fixture: ComponentFixture<AccountsummaryComponent>;
  let debugElement: DebugElement;
  let mockAccountService;
  let mockModalService;
  let accSummary;
  let trans;
  beforeEach(async(() => {
    accSummary = accountsummary;
    trans = transactions;
    mockAccountService = jasmine.createSpyObj(['getAccountSummary', 'getTransactionHistory']);
    mockModalService = jasmine.createSpyObj(['show']);

    TestBed.configureTestingModule({
      declarations: [AccountsummaryComponent],
      providers: [
        { provide: AccountService, useValue: mockAccountService },
        { provide: BsModalService, useValue: mockModalService },
      ],
      imports: [ModalModule.forRoot(), RouterTestingModule, HttpClientTestingModule],
      schemas: [NO_ERRORS_SCHEMA]
    })
      .compileComponents();
  }));

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

  it('clicking on info-icon should open info modal', () => {

    mockAccountService.getTransactionHistory.and.returnValue(of(trans));
    mockAccountService.getAccountSummary.and.returnValue(of(accSummary));
    fixture.detectChanges();
    const showModal = mockModalService.show.and.returnValue(of([]));
    const infoIcon = debugElement.query(By.css('img'));
    infoIcon.triggerEventHandler('click', {});
    fixture.detectChanges();
    expect(showModal).toHaveBeenCalled();
  });
});

在spec文件中，我有

acsumary

和

trans

，它们包含各自的json数据。我正在模拟

AccountService

来调用

getAccountSummary

和

getTransactionHistory

方法。我从这些方法返回

acsumary

和

trans

。但是Karma控制台说

未捕获的SyntaxError:JSON中的意外标记o位于抛出的位置1

。测试随机通过，有时失败。请帮忙。 这是component.ts文件：

ngOnInit() {

    this.authService.isTokenIdValid().subscribe((res) => {
    }, () => {
      window.localStorage.removeItem('token');
      this.router.navigate(['/login'])
    })
    this.accountService.getTransactionHistory().subscribe((res) => {
      res = JSON.parse(res);
      this.transactionHistory = res['Result'].array.RevTrxn.sort((a, b) => {
        return a.trxn.recDate > b.trxn.recDate ? -1 : 1;
      });
      this.filteredTransactions = this.transactionHistory;
      this.filteredTransactionsLength = this.filteredTransactions.length;
      this.currentTransactions = this.transactionHistory.slice(0, this.itemsPerPage);
      this.isTransactionsLoaded = true;
      this.maxDate = new Date(this.filteredTransactions[0].trxn.recDate);
      this.minDate = new Date(this.maxDate.getTime() - 7 * 24 * 60 * 60 * 1000);

      this.bsRangeValue = [this.minDate, this.maxDate];
      this.selectedDateRange = this.bsRangeValue;
      this.onDateChange(this.selectedDateRange);

    })
  }

---

您是否在组件中执行任何JSON.parse和JSON.stringify操作？@AliF50是的，我在组件的ngOnInit中使用了JSON.parse。我已在上面添加了ngOnInit代码。您是否查看了关于存在的相同错误的任何问题？它通常发生在您尝试解析和已解析的对象时。这是否回答了您的问题？

ngOnInit() {

    this.authService.isTokenIdValid().subscribe((res) => {
    }, () => {
      window.localStorage.removeItem('token');
      this.router.navigate(['/login'])
    })
    this.accountService.getTransactionHistory().subscribe((res) => {
      res = JSON.parse(res);
      this.transactionHistory = res['Result'].array.RevTrxn.sort((a, b) => {
        return a.trxn.recDate > b.trxn.recDate ? -1 : 1;
      });
      this.filteredTransactions = this.transactionHistory;
      this.filteredTransactionsLength = this.filteredTransactions.length;
      this.currentTransactions = this.transactionHistory.slice(0, this.itemsPerPage);
      this.isTransactionsLoaded = true;
      this.maxDate = new Date(this.filteredTransactions[0].trxn.recDate);
      this.minDate = new Date(this.maxDate.getTime() - 7 * 24 * 60 * 60 * 1000);

      this.bsRangeValue = [this.minDate, this.maxDate];
      this.selectedDateRange = this.bsRangeValue;
      this.onDateChange(this.selectedDateRange);

    })
  }