File checkbox.spec.ts

src/material/checkbox/checkbox.spec.ts:None–None

import {dispatchFakeEvent} from '@angular/cdk/testing/private';
import {ChangeDetectionStrategy, Component, DebugElement} from '@angular/core';
import {ComponentFixture, TestBed} from '@angular/core/testing';
import {FormControl, FormsModule, NgModel, ReactiveFormsModule} from '@angular/forms';