要进行Angular拦截器客户端测试，可以按照以下步骤进行解决：

1. 首先，创建一个拦截器类，例如interceptor.service.ts，并实现HttpInterceptor接口。在该类中，可以定义拦截器的逻辑，例如在请求或响应期间添加、修改或删除请求头信息。

import { Injectable } from '@angular/core';
import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable()
export class MyInterceptor implements HttpInterceptor {
  constructor() {}

  intercept(request: HttpRequest, next: HttpHandler): Observable> {
    // 在请求期间添加/修改/删除请求头信息
    const modifiedRequest = request.clone({
      setHeaders: {
        Authorization: 'Bearer my-token'
      }
    });

    return next.handle(modifiedRequest);
  }
}

2. 在测试中，可以使用Angular的TestBed和HttpClientTestingModule来模拟HTTP请求和响应。在测试之前，需要导入HttpClientTestingModule并在providers数组中添加拦截器类。

import { TestBed, inject } from '@angular/core/testing';
import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
import { HttpClient, HTTP_INTERCEPTORS } from '@angular/common/http';

import { MyInterceptor } from './interceptor.service';

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

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpClientTestingModule],
      providers: [
        {
          provide: HTTP_INTERCEPTORS,
          useClass: MyInterceptor,
          multi: true
        }
      ]
    });

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

  afterEach(() => {
    // 确保没有未处理的HTTP请求
    httpTestingController.verify();
  });

  it('should add Authorization header', inject(
    [HttpClient, HttpTestingController],
    (http: HttpClient, controller: HttpTestingController) => {
      // 发送GET请求
      http.get('/api/data').subscribe();

      // 断言请求中的Authorization头是否存在
      const req = httpTestingController.expectOne('/api/data');
      expect(req.request.headers.has('Authorization')).toBeTruthy();

      // 响应请求
      req.flush({});
    }
  ));
});

在上面的示例中，我们创建了一个MyInterceptor拦截器类，并将其作为提供者添加到TestBed中。然后，我们使用inject函数来注入HttpClient和HttpTestingController实例，并在测试中发出HTTP请求。最后，我们使用expectOne方法来检查请求中是否存在Authorization头，并使用req.flush方法模拟响应。

通过以上步骤，你就可以对Angular拦截器进行客户端测试了。