Updated the files.

my-app/node_modules/@schematics/angular/application/files/module-files/src/app/app.component.spec.ts.template

@@ -0,0 +1,35 @@
+import { TestBed } from '@angular/core/testing';<% if (routing) { %>
+import { RouterTestingModule } from '@angular/router/testing';<% } %>
+import { AppComponent } from './app.component';
+
+describe('AppComponent', () => {
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({<% if (routing) { %>
+      imports: [
+        RouterTestingModule
+      ],<% } %>
+      declarations: [
+        AppComponent
+      ],
+    }).compileComponents();
+  });
+
+  it('should create the app', () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.componentInstance;
+    expect(app).toBeTruthy();
+  });
+
+  it(`should have as title '<%= name %>'`, () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.componentInstance;
+    expect(app.title).toEqual('<%= name %>');
+  });
+
+  it('should render title', () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    fixture.detectChanges();
+    const compiled = fixture.nativeElement as HTMLElement;
+    expect(compiled.querySelector('h1')?.textContent).toContain('Hello, <%= name %>');
+  });
+});

my-app/node_modules/@schematics/angular/application/files/module-files/src/app/app.component.ts.template

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+import { Component } from '@angular/core';
+
+@Component({
+  selector: '<%= selector %>',<% if(inlineTemplate) { %>
+  template: `
+    <h1>Welcome to {{title}}!</h1>
+
+    <% if (routing) {
+     %><router-outlet /><%
+    } %>
+  `,<% } else { %>
+  templateUrl: './app.component.html',<% } if(inlineStyle) { %>
+  styles: []<% } else { %>
+  styleUrl: './app.component.<%= style %>'<% } %>
+})
+export class AppComponent {
+  title = '<%= name %>';
+}

my-app/node_modules/@schematics/angular/application/files/module-files/src/app/app.module.ts.template

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+import { NgModule } from '@angular/core';
+import { BrowserModule } from '@angular/platform-browser';
+<% if (routing) { %>
+import { AppRoutingModule } from './app-routing.module';<% } %>
+import { AppComponent } from './app.component';
+
+@NgModule({
+  declarations: [
+    AppComponent
+  ],
+  imports: [
+    BrowserModule<% if (routing) { %>,
+    AppRoutingModule<% } %>
+  ],
+  providers: [],
+  bootstrap: [AppComponent]
+})
+export class AppModule { }

my-app/node_modules/@schematics/angular/application/files/module-files/src/main.ts.template

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+<% if(!!viewEncapsulation) { %>import { ViewEncapsulation } from '@angular/core';
+<% }%>import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
+
+import { AppModule } from './app/app.module';
+
+<% if(!!viewEncapsulation) { %>
+platformBrowserDynamic().bootstrapModule(AppModule, {
+  defaultEncapsulation: ViewEncapsulation.<%= viewEncapsulation %>
+})
+  .catch(err => console.error(err));<% } else { %>
+platformBrowserDynamic().bootstrapModule(AppModule)
+  .catch(err => console.error(err));
+<% } %>