Invalid data type for services about ngentest HOT 6 CLOSED

import { Injectable } from '@angular/core';
import { Router } from '@angular/router';

@Injectable()
export class DataService {

  constructor(private _router: Router) {
  }

}

import { async } from '@angular/core/testing';
import { Injectable } from '@angular/core';
import { Observable, of as observableOf, throwError } from 'rxjs';

import { DataService } from './menu.service';
import { Router } from '@angular/router';

@Injectable()
class MockRouter {
  navigate() {};
}

describe('DataService', () => {
  let service;

  beforeEach(() => {
    service = new DataService({});  // ERROR: Argument of type '{}' is not assignable to parameter of type 'Router'. Type '{}' is missing the following properties from type 'Router': rootComponentType, urlSerializer, rootContexts, location, and 48 more.
  });

});

$ cat ./data.service.ts
import { Injectable } from '@angular/core';
import { Router } from '@angular/router';

@Injectable()
export class DataService {

  constructor(private _router: Router) {
  }

  test() {
    this.foo = 1;
  }

}
$ cat ./data.service.spec.ts
import { async } from '@angular/core/testing';
import { Injectable } from '@angular/core';
import { Observable, of as observableOf, throwError } from 'rxjs';

import { DataService } from './data.service';
import { Router } from '@angular/router';

@Injectable()
class MockRouter {
  navigate = jest.fn();
}

describe('DataService', () => {
  let service;

  beforeEach(() => {
    service = new DataService({});
  });

  it('should run #test()', async () => {

    service.test();

  });

});
$ jest ./data.service.spec.ts
 PASS  ./data.service.spec.ts
  DataService
    ✓ should run #test() (2ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        1.382s, estimated 4s
Ran all test suites matching /.\/data.service.spec.ts/i.
jest-html-reporter >> Report generated (./reports/unit-test-report/index.html)

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  "exclude": [
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