Component Unit Testing in Ionic 3 using Jasmine-Karma

I am trying to test a page in Ionic 3. So, I created .spec.ts of that page manually within src/pages/page folder. But when I create component using TestBed.createComponent, then it shows following error :

about.spec.ts file

    import { CUSTOM_ELEMENTS_SCHEMA } from "@angular/core";
import { TestBed, ComponentFixture, async } from "@angular/core/testing";
import { AboutPage } from './about';
import { IonicPageModule, NavController, NavParams, Platform } from 'ionic-angular';
import { BrowserDynamicTestingModule,platformBrowserDynamicTesting } from '@angular/platform-browser-dynamic/testing';

describe('AboutPage', () => {

    let fixture;
    let component;
    beforeEach(async(() => {
        TestBed.resetTestEnvironment();
        TestBed.initTestEnvironment(BrowserDynamicTestingModule,platformBrowserDynamicTesting());
      TestBed.configureTestingModule({
        declarations: [ AboutPage ],
        imports: [IonicPageModule.forChild(AboutPage)],
        schemas: [CUSTOM_ELEMENTS_SCHEMA],
        providers: [NavController, NavParams, Platform]
      }).compileComponents().then((response) => {
          fixture = TestBed.createComponent(AboutPage);
          component = fixture.componentInstance;
          fixture.detectChanges();
      });
    }));

    afterEach(() => {
      fixture.destroy();
      component = null;
    });

     describe('First test',() => {
        it('should print',() => {
            let a = true;
            expect(a).toBeTruthy();
        })
    })
});

I am unable to find out where my code is lacking due to which this error is coming. I need to fetch component in my spec file so as to perform testing on its functions and its part. Please suggest where I may be doing wrong.