Updated the files.

my-app/node_modules/@schematics/angular/guard/implements-files/__name@dasherize__.guard.spec.ts.template

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

my-app/node_modules/@schematics/angular/guard/implements-files/__name@dasherize__.guard.ts.template

@@ -0,0 +1,31 @@
+import { Injectable } from '@angular/core';
+import { <%= routerImports %> } from '@angular/router';
+import { Observable } from 'rxjs';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class <%= classify(name) %>Guard implements <%= implementations %> {
+  <% if (implements.includes('CanActivate')) { %>canActivate(
+    route: ActivatedRouteSnapshot,
+    state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
+    return true;
+  }
+  <% } %><% if (implements.includes('CanActivateChild')) { %>canActivateChild(
+    childRoute: ActivatedRouteSnapshot,
+    state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
+    return true;
+  }
+  <% } %><% if (implements.includes('CanDeactivate')) { %>canDeactivate(
+    component: unknown,
+    currentRoute: ActivatedRouteSnapshot,
+    currentState: RouterStateSnapshot,
+    nextState?: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
+    return true;
+  }
+  <% } %><% if (implements.includes('CanMatch')) { %>canMatch(
+    route: Route,
+    segments: UrlSegment[]): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
+    return true;
+  }<% } %>
+}