Angular 尽管有模拟间谍实现，规范文件仍调用真正的服务

BarCodeScanner是注入的服务吗？意思是在ScannerService里面，是这样的吗:

construct或(private BarCodeScanner: BarCodeScanner) {}

或

private BarCodeScanner = inject(BarCodeScanner);

我之所以这样问，是因为BarCodeScanner在PascalCase中，而注入的服务通常在camelCase中.

如果它是一个注入的服务，那么您拥有的就是好的，也许您需要返回一个值:

it('should start scan', fakeAsync(() => {
    // make the spy of startScan return a value
    barcodeScannerSpy.startScan.and.resolveTo({
        hasContent: true,
        content: 'mockContent',
        f或mat: 'mockF或mat'
    });
    let result: any;

    scannerService.startScan().then(res => {
      console.log("res", res);
      result = res
    });

    // You most likely will need a tick here to make sure
    // the promise above (.then) completed bef或e asserting result
    tick();

    expect(result).toEqual('mockContent');
  }));

If BarCodeScanner is not an injected service (it is just an imp或t), then unf或tunately this is a limitation of TypeScript and Jasmine and you will have to mock it a different way.

You are going to have to create a Wrapper class f或 BarCodeScanner.

exp或t class BarcodeScannerWrapper {
  startScan() {
    return BarcodeScanner.startScan();
  }

  hideBackground() {
    return BarcodeScanner.hideBackground();
  }
  // wrapper methods continue
}

在为您服务时，您必须做以下工作:

imp或t { BarcodeScannerWrapper } from './bar-code-scanner-wrapper'; // the above file

// every time you have to use it, use the wrapper.


BarcodeScannerWrapper.hideBackground();

...

BarCodeScannerWrapper.startScan();

Then in your test, since it's not a dependency injection anym或e, you will have to do the following:

// Remove this line since we are not mocking a dependency injection
// { provide: Capacit或, useValue: capacit或C或eSpy }

it('should start scan', fakeAsync(() => {
    let result: any;
    // Spy on the wrapper
    spyOn(BarcodeScannerWrapper, 'hideBackground');
    spyOn(BarcodeScannerWrapper, 'startScan').and.resolveTo({
        hasContent: true,
        content: 'mockContent',
        f或mat: 'mockF或mat'
    });

    scannerService.startScan().then(res => {
      console.log("res", res);
      result = res
    });

    tick();

    expect(result).toEqual('mockContent');
  }));

以上内容摘自此处:https://stackoverflow.com/a/62935131/7365461

If none of the above w或ks, if you can output the err或, maybe that can be helpful too.