Implement Widget testing

I'm pretty noob in testing and don't know how to implement widget testing for the following flutter code. thanks in advance.

code description: I have made a slideshow using carousal widget and a button using inkwell this button simply directs to the next screen.

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import 'package:flutter/material.dart';
import 'package:baseball/ui/phone/phone_page.dart';
import 'package:carousel_pro/carousel_pro.dart';
import 'package:flutter/services.dart';
import './splash_widgets.dart';

class SplashPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    SystemChrome.setPreferredOrientations([
      DeviceOrientation.portraitDown,
      DeviceOrientation.portraitUp,
    ]);
    return Container(
      child: Scaffold(
        appBar:PreferredSize(
        preferredSize: Size.fromHeight(60.0),
    child: Appbar()),
        body: Center(
          child: Column(
            children: <Widget>[
              Expanded(
      child: Carousel(
        images: [
          AssetImage('images/SlideImage_1.jpg'),
          AssetImage('images/SlideImage_2.jpg'),
          AssetImage('images/SlideImage_3.jpg'),
        ],
        animationCurve: Curves.fastOutSlowIn,
        animationDuration: Duration(milliseconds: 2000),
      ),
    ),
              SizedBox(
      height: 70,

      width: double.infinity,
      // height: double.infinity,
      child: InkWell(
        onTap: () => Navigator.push(
              context,
              MaterialPageRoute(builder: (context) => Phone()),
            ),
        child: new Container(
          //width: 100.0,
          height: 50.0,
          decoration: new BoxDecoration(
            color: Theme.of(context).buttonColor,
          ),
          child: new Center(
            child: new Text(
              'GET STARTED',
              style: Theme.of(context).textTheme.button,
            ),
          ),
        ),
      ),
    )
            ],
          ),
        ),
      ),
    );
  }
}```