Updated the files.

my-app/node_modules/@schematics/angular/resolver/class-files/__name@dasherize__.resolver.spec.ts.template

@@ -0,0 +1,16 @@
+import { TestBed } from '@angular/core/testing';
+
+import { <%= classify(name) %>Resolver } from './<%= dasherize(name) %>.resolver';
+
+describe('<%= classify(name) %>Resolver', () => {
+  let resolver: <%= classify(name) %>Resolver;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    resolver = TestBed.inject(<%= classify(name) %>Resolver);
+  });
+
+  it('should be created', () => {
+    expect(resolver).toBeTruthy();
+  });
+});

my-app/node_modules/@schematics/angular/resolver/class-files/__name@dasherize__.resolver.ts.template

@@ -0,0 +1,16 @@
+import { Injectable } from '@angular/core';
+import {
+  Router, Resolve,
+  RouterStateSnapshot,
+  ActivatedRouteSnapshot
+} from '@angular/router';
+import { Observable, of } from 'rxjs';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class <%= classify(name) %>Resolver implements Resolve<boolean> {
+  resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean> {
+    return of(true);
+  }
+}