Why testing ensures app reliability in Flutter - Build It to Prove It

Build: Testing Explanation Screen

This screen explains why testing is important for app reliability using simple text and examples.

Target UI

-----------------------------
| Testing Explanation       |
|---------------------------|
| Why test your app?        |
|                           |
| 1. Find bugs early        |
| 2. Prevent crashes        |
| 3. Keep features working  |
|                           |
| Example:                 |
| Button tap changes text  |
| [Tap me]                 |
| Text: "Not tapped"       |
|                           |
-----------------------------

Show a title at the top: 'Testing Explanation'

Display a list of three reasons why testing helps reliability

Show a button labeled 'Tap me' below the reasons

Show a text below the button that changes from 'Not tapped' to 'Tapped!' when the button is pressed

Use simple layout with padding and readable font sizes

Starter Code

Flutter

import 'package:flutter/material.dart';

class TestingExplanationScreen extends StatefulWidget {
  @override
  State<TestingExplanationScreen> createState() => _TestingExplanationScreenState();
}

class _TestingExplanationScreenState extends State<TestingExplanationScreen> {
  bool _tapped = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Testing Explanation'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('Why test your app?', style: Theme.of(context).textTheme.headline6),
            SizedBox(height: 12),
            // TODO: Add list of reasons here
            // TODO: Add button and changing text here
          ],
        ),
      ),
    );
  }
}

Task 1

Task 2

Task 3

Task 4

Solution

Flutter

import 'package:flutter/material.dart';

class TestingExplanationScreen extends StatefulWidget {
  @override
  State<TestingExplanationScreen> createState() => _TestingExplanationScreenState();
}

class _TestingExplanationScreenState extends State<TestingExplanationScreen> {
  bool _tapped = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Testing Explanation'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('Why test your app?', style: Theme.of(context).textTheme.headline6),
            SizedBox(height: 12),
            Text('1. Find bugs early', style: TextStyle(fontSize: 16)),
            Text('2. Prevent crashes', style: TextStyle(fontSize: 16)),
            Text('3. Keep features working', style: TextStyle(fontSize: 16)),
            SizedBox(height: 24),
            Text('Example:', style: Theme.of(context).textTheme.subtitle1),
            SizedBox(height: 8),
            ElevatedButton(
              onPressed: () {
                setState(() {
                  _tapped = true;
                });
              },
              child: Text('Tap me'),
            ),
            SizedBox(height: 12),
            Text(_tapped ? 'Tapped!' : 'Not tapped', style: TextStyle(fontSize: 18)),
          ],
        ),
      ),
    );
  }
}

This screen shows why testing is important for app reliability in a simple way. We list three clear reasons to test apps: finding bugs early, preventing crashes, and keeping features working.

We also add a button that changes text when tapped. This small interactive example shows how testing can ensure that features behave as expected.

The code uses a StatefulWidget to update the UI when the button is pressed. Padding and spacing make the screen easy to read.

Final Result

Completed Screen

-----------------------------
| Testing Explanation       |
|---------------------------|
| Why test your app?        |
|                           |
| 1. Find bugs early        |
| 2. Prevent crashes        |
| 3. Keep features working  |
|                           |
| Example:                 |
| [Tap me]                 |
| Text: "Not tapped"       |
|                           |
-----------------------------

When user taps the 'Tap me' button, the text below changes from 'Not tapped' to 'Tapped!'

This shows a simple example of how testing can check if a feature works correctly

Stretch Goal

Add a reset button to change the text back to 'Not tapped'

💡 Hint

Add another ElevatedButton labeled 'Reset' that sets _tapped to false when pressed