当使用HttpTestingController模拟HTTP请求时，有时会出现无法匹配带参数的URL的问题。此时需要通过传递HttpParams对象来解决这一问题。

以下是一个使用HttpParams对象传递参数的代码示例：

import { HttpTestingController, HttpClientTestingModule } from '@angular/common/http/testing';
import { HttpClient, HttpParams } from '@angular/common/http';

describe('MyService', () => {
  let service: MyService;
  let httpClient: HttpClient;
  let httpTestingController: HttpTestingController;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpClientTestingModule],
      providers: [MyService]
    });

    service = TestBed.inject(MyService);
    httpTestingController = TestBed.inject(HttpTestingController);
    httpClient = TestBed.inject(HttpClient);
  });

  afterEach(() => {
    httpTestingController.verify();
  });

  it('should send request with query string parameter', () => {
    // Define the value we expect to be returned by the mock backend
    const expectedValue = 'value';

    // Set up the request params
    const params = new HttpParams().set('paramName', 'paramValue');

    // Use the HttpClient to send the request and subscribe to the response
    httpClient.get('https://my-api.com/api-endpoint', {params}).subscribe((response) => {
      expect(response).toEqual(expectedValue);
    });

    // Define the mock response and pass it to the expectOne method of the HttpTestingController
    const req = httpTestingController.expectOne('https://my-api.com/api-endpoint?paramName=paramValue');
    req.flush(expectedValue);
  });
});

在上述代码中，我们通过创建一个HttpParams对象并传递给HttpClient的get方法来设置请求的参数。然后，我们使用HttpTestingController的expectOne方法来定义模拟的响应并指定带参数的URL来匹配请求。最后，我们通过调用flush方法将预期的响应返回给请求。

这种做法可以帮助我们解决HttpTestingController无法匹配带参数的URL的问题。