docs: add forms overview example for snippets (#25663)

PR Close #25663

aio/content/examples/forms-overview/src/app/template/name/name.component.spec.ts

@@ -0,0 +1,76 @@
+// #docregion
+import { async, ComponentFixture, TestBed, tick, fakeAsync } from '@angular/core/testing';
+import { FormsModule } from '@angular/forms';
+
+import { createNewEvent } from '../../shared/utils';
+import { TemplateNameComponent } from './name.component';
+
+// #docregion tests
+describe('Template Name Component', () => {
+// #enddocregion tests
+  let component: TemplateNameComponent;
+  let fixture: ComponentFixture<TemplateNameComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      imports: [FormsModule],
+      declarations: [TemplateNameComponent]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(TemplateNameComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+
+// #docregion tests
+  it('should update the value in the control', fakeAsync(() => {
+    // update the component instance variable
+    component.name = 'Nancy';
+
+    // run change detection
+    fixture.detectChanges();
+
+    // advance after change detection cycle
+    tick();
+
+    // query the element
+    const input = fixture.nativeElement.querySelector('input');
+
+    expect(input.value).toBe('Nancy');
+  }));
+
+  it('should update the value of the input field', fakeAsync(() => {
+    // update component instance variable
+    component.name = 'Nancy';
+
+    // run change detection
+    fixture.detectChanges();
+
+    // advance after change detection cycle
+    tick();
+
+    // query the element
+    const input = fixture.nativeElement.querySelector('input');
+    expect(input.value).toEqual('Nancy');
+
+    // update the form field value
+    input.value = 'Smith';
+
+    // Use utility function to create custom event, then dispatch on the input
+    const event = createNewEvent('input');
+    input.dispatchEvent(event);
+
+    // advance after change detection cycle
+    tick();
+
+    expect(component.name).toEqual('Smith');
+  }));
+});
+// #enddocregion

aio/content/examples/forms-overview/src/app/template/name/name.component.ts

@@ -0,0 +1,16 @@
+// #docplaster
+// #docregion
+import { Component } from '@angular/core';
+
+@Component({
+// #enddocregion
+  selector: 'app-template-name',
+// #docregion
+  template: `
+    Name: <input type="text" [(ngModel)]="name">
+  `
+})
+export class TemplateNameComponent {
+  name = '';
+}
+// #enddocregion

aio/content/examples/forms-overview/src/app/template/template.module.spec.ts

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+import { TemplateModule } from './template.module';
+
+describe('TemplateModule', () => {
+  let templateModule: TemplateModule;
+
+  beforeEach(() => {
+    templateModule = new TemplateModule();
+  });
+
+  it('should create an instance', () => {
+    expect(templateModule).toBeTruthy();
+  });
+});

aio/content/examples/forms-overview/src/app/template/template.module.ts

@@ -0,0 +1,14 @@
+import { NgModule } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { TemplateNameComponent } from './name/name.component';
+import { FormsModule } from '@angular/forms';
+
+@NgModule({
+  imports: [
+    CommonModule,
+    FormsModule
+  ],
+  declarations: [TemplateNameComponent],
+  exports: [TemplateNameComponent]
+})
+export class TemplateModule { }