How to justify text properly?

I am using textAlign: TextAlign.justify in a flutter Text widget and it only works if the text is wider than the screen. If the text is shorter than the available width it centers the text.

What I want is normal paragraph justification (ie. the same as a word processor) whereby long lines are justified and short lines are left aligned.

Here is my code:

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: TestClass(),
      ),
    );
  }
}

class TestClass extends StatefulWidget {
  @override
  _TestClassState createState() => _TestClassState();
}

class _TestClassState extends State<TestClass> {
  double loginWidth = 40.0;

  @override
  Widget build(BuildContext context) {
    return Container(
        decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(10),
            border: Border.all(),
        ),
        padding: EdgeInsets.all(10),
        child: Column(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
                const Text(
                    'If you have a long line of text then the text text is wider than the screen and it justifies correctly, just as you would expect. So far so good.',
                    textAlign: TextAlign.justify,
                ),
                const SizedBox(height: 20),
                const Text(
                    'This is wrong',
                    textAlign: TextAlign.justify,
                ),
            ],
        )
    );
  }
}

And this is what it looks like:

Any suggestions as to what alignment I can use to handle both short and long text?

Justify property would work when length of text is greater to width of container, if you want both text to start from starting use crossAxisAlignment: CrossAxisAlignment.start

child: Column(
  mainAxisSize: MainAxisSize.min,
  crossAxisAlignment: CrossAxisAlignment.start,
)