要为惰性加载的路由创建单元测试，您可以按照以下步骤操作：

1. 首先，创建一个模块的测试文件，用于导入和配置所需的模块和服务。假设您的惰性加载路由模块名为LazyModule，测试文件名为lazy.module.spec.ts：

import { TestBed, async } from '@angular/core/testing';
import { RouterTestingModule } from '@angular/router/testing';
import { LazyModule } from './lazy.module';

describe('LazyModule', () => {
  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [
        RouterTestingModule,
        LazyModule
      ]
    }).compileComponents();
  }));

  it('should create the lazy module', () => {
    const fixture = TestBed.createComponent(LazyModule);
    const lazyModule = fixture.debugElement.componentInstance;
    expect(lazyModule).toBeTruthy();
  });
});

2. 接下来，您可以创建一个用RouterTestingModule模拟路由的测试。假设您的惰性加载路由路径为lazy，测试文件名为lazy.component.spec.ts：

import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { RouterTestingModule } from '@angular/router/testing';
import { LazyComponent } from './lazy.component';

describe('LazyComponent', () => {
  let component: LazyComponent;
  let fixture: ComponentFixture;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [RouterTestingModule],
      declarations: [LazyComponent]
    }).compileComponents();
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(LazyComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should create the lazy component', () => {
    expect(component).toBeTruthy();
  });
});

以上代码示例创建了一个LazyComponent组件的测试，该组件是惰性加载路由的一部分。您可以根据需要添加其他测试用例。

请注意，上述示例仅供参考，具体测试需求可能会有所不同。