Internship Basic Guidance v0.1.0

Internship Basic Guidance v0.1.0

Intern Information

In this document, you can find the information about the intern who participated in the Flutter internship program.

Intern Name: John Doe

John Doe is a talented computer engineering student currently in their third year at ABC University.

With a passion for mobile app development and a keen interest in Flutter, John joined our internship program to further enhance their skills and gain hands-on experience in real-world projects.

Throughout the internship, John has demonstrated great enthusiasm and dedication to mastering Flutter and delivering high-quality work.

Feel free to reach out to John through their GitHub, LinkedIn, or Twitter accounts to connect or learn more about their projects and experiences during the internship.

Intern's Project Development Env. Checklist:

Please provide the information regarding the tools, configurations, and other preferences used by the intern during the project development process. This checklist will help monitor the intern's contributions to the project and the technologies they utilized.

Internship Program Flow

Week 1-2: Introduction to Flutter and Dart During the first two weeks of the six-week internship program, participants will dive into the world of Flutter and Dart. They will learn the fundamentals of Flutter app development and Dart programming language. The focus will be on understanding Flutter's widget system, creating UI designs, and implementing basic state management. By the end of this phase, stajyers will have built their first simple Flutter app.

Week 3-4: Advanced Topics and Project Development In the next phase, stajyers will explore more advanced topics in Flutter development. This includes working with APIs for data integration, implementing navigation and routing, and optimizing app performance. Stajyers will engage in a team project where they collaboratively develop a feature-rich Flutter app. The project encourages teamwork and effective communication while applying the skills learned during the program.

Week 5-6: Project Presentation and Documentation During the final weeks, stajyers will finalize their team project and prepare for the project presentation. They will create comprehensive documentation detailing their app's architecture, design choices, and technical implementation. Additionally, each stajyer will develop an individual Flutter package project, accompanied by well-documented code. The package project showcases their proficiency in creating reusable components and contributing to the Flutter community. The internship concludes with a team presentation where stajyers showcase their projects and share their experiences.

This six-week internship program aims to equip participants with practical Flutter development skills and foster collaboration and professionalism in a team environment. Stajyers will not only gain hands-on experience in mobile app development but also learn to document their work effectively and present their achievements confidently. The program sets the stage for aspiring developers to take their first step towards a successful career in Flutter development.

Internship Project - 250-Hour Weekly Work Plan

Week 1-2: Creating Flutter Application Packages (Total 90 Hours)

  • Day 1-3 (24 Hours):

    • Theoretical training on creating Flutter packages will be provided.

    • Analysis of sample packages and examination of usage scenarios will be conducted.

  • Day 4-6 (24 Hours):

    • Interns will select their own package projects and start development.

    • The basic structure of the projects will be set up, and necessary components will be added.

  • Day 7-10 (42 Hours):

    • Completion of packages and making them ready for open-source sharing will be ensured.

    • The developed packages will be shared and documented on platforms like GitHub.

Week 3-4: Documentation Creation (Total 60 Hours)

  • Day 11-15 (30 Hours):

    • Interns will prepare detailed documentation for their developed packages.

    • Documentation will include usage guides, API references, and sample applications.

  • Day 16-20 (30 Hours):

    • Review of package documentation and completion of any missing parts will be done.

    • Finalized documentation will be integrated into the open-source repositories.

Week 5-6: Project Testing, Writing Articles, and Project Presentation (Total 100 Hours)

  • Day 21-25 (40 Hours):

    • Interns will test their developed packages and conduct debugging.

    • Test scenarios will be created to ensure reliable and error-free functionality of the packages.

  • Day 26-30 (60 Hours):

    • Interns will write articles related to their package projects.

    • Articles will cover how the packages can be used, their advantages, and the development process.

    • Interns will prepare a project presentation showcasing their work and achievements during the internship.

    • The presentations will be delivered to managers and team members for evaluation.

This updated work plan aims to ensure that interns effectively utilize their 250 hours during the internship, with a daily minimum of 8 hours. The inclusion of project testing in the last 100 hours allows interns to ensure the reliability and functionality of their packages. Additionally, the plan still covers essential tasks such as creating Flutter application packages, open-sourcing them, creating documentation, writing articles, and presenting their projects. By the end of the internship, participants will have gained valuable skills and experiences in Flutter development, project management, and teamwork.

Let's start with the basics

The essential topics for a Flutter intern include fundamental knowledge of Flutter and Dart programming language. They should grasp UI design using Material Design and Cupertino styles, along with commonly used widget types. Understanding state management is crucial, including the usage of setState() and knowledge about state management libraries like Provider, BLoC, MobX. Additionally, they must handle API integration, asynchronous operations, HTTP requests, and utilize Navigator for page transitions. Database integration, package management, testing, debugging, hardware utilization (camera, sensors, location), performance optimization, and optional Firebase integration are also vital skills. Working on these topics will help the intern gain practical experience and actively contribute to real-world projects.

Flutter Development Environment Checklist

Installation Requirements:

Editor and Development Environment:

Testing and Emulation:

Project Creation and Execution:

Other Tools:

Internationalization (optional):

Workspace Check:

This checklist can be used to verify that your Flutter development environment is set up correctly and ready to start your project. You can check off each item as you progress. Good luck!

Flutter Installation - macOS

  1. Install Homebrew: First, install Homebrew, which is a package manager for macOS and simplifies the Flutter installation process.

  2. Install Xcode: Xcode is essential for Flutter app development. Download and install Xcode from the App Store. Also, make sure to install Xcode command-line tools.

  3. Download Flutter SDK: Download the Flutter SDK for macOS from the official Flutter website. Extract the downloaded file and move it to a desired location (e.g., /usr/local/flutter).

  4. Add Flutter to PATH: To use Flutter, add the Flutter SDK to your system's PATH. You can do this by running the command export PATH=$PATH:/usr/local/flutter/bin in the terminal or by adding this path to your terminal profile file (e.g., ~/.bash_profile or ~/.zshrc).

  5. Install Flutter Tools: Run flutter doctor in the terminal. This will check Flutter dependencies and notify you of any missing tools that need to be installed. Follow the instructions to install the necessary tools.

  6. Install iOS Simulator (Optional): If you plan to develop iOS apps, you should install the iOS simulator within Xcode.

  7. Prepare Your Editor: Choose the code editor that suits you best. Recommended options include Android Studio, IntelliJ, or Visual Studio Code. Install Flutter and Dart plugins to make your editor Flutter-ready.

Resources

By following these steps, you can install Flutter on macOS and set up your Flutter development environment.

Flutter Installation - Windows

  1. Install Git and Flutter SDK:

    • Install Git to use version control and download packages.

    • Download the Flutter SDK for Windows from the official Flutter website.

    • Extract the downloaded file to a desired location (e.g., C:\src\flutter).

  2. Set up Environment Variables:

    • Add the Flutter SDK path to the system's PATH variable.

    • Open Environment Variables settings and add the Flutter bin directory (e.g., C:\src\flutter\bin) to the PATH.

  3. Install Android Studio:

    • Download and install Android Studio, which provides essential tools like the Android emulator and AVD Manager.

  4. Install Flutter and Dart Plugins:

    • Open Android Studio and install the Flutter and Dart plugins from the Plugin Marketplace.

  5. Install Android SDK and AVD:

    • In Android Studio, go to the SDK Manager and install the Android SDK and necessary components.

    • Create an Android Virtual Device (AVD) to test your Flutter apps on an emulator.

  6. Enable Windows Hypervisor Platform (WHPX) (Optional):

    • If you plan to use the Windows Hypervisor Platform for better emulator performance, enable it in Windows Features settings.

  7. Test Flutter Installation:

    • Open a terminal or command prompt and run flutter doctor to check Flutter dependencies and see if everything is set up correctly.

Resources

By following these steps, you can install Flutter on Windows and set up your Flutter development environment.

Please note that Flutter development on Windows requires additional setup for Android development. The steps above cover the essential Flutter installation process on Windows.

FVM (Flutter Version Management) Guide

FVM is a tool used to manage multiple Flutter SDK versions in your Flutter projects. In this guide, you will learn how to install FVM, use it, and get familiar with some basic commands.

Installation

Follow the steps below to install FVM:

  1. Make sure you have Flutter SDK installed. If you don't have Flutter SDK installed, download and install it from the official Flutter website.

  2. The path to the Flutter SDK should be added to system variables (e.g., PATH variable).

  3. Make sure Dart is added to the PATH variable.

  4. Open the terminal and navigate to the folder where you want to install FVM.

  5. To install FVM, run the following command:

flutter pub global activate fvm


6. Verify that FVM has been successfully installed by running the following command:

```sh
fvm --version

Usage

You can use FVM by using the following basic commands:

  • Download a specific version of Flutter SDK:

fvm install <version>

  • List available Flutter SDK versions:

fvm list

  • Use a specific Flutter SDK version for your project:

fvm use <version>

  • Set a global Flutter SDK version for all projects:

fvm global <version>

  • Update FVM versions:

fvm flutter pub global activate fvm

Example Usage

  1. Navigate to your project folder:

cd my_flutter_project

  1. Install the Flutter SDK version you want to use for your project:

fvm install 2.2.3

  1. Use a specific Flutter SDK version for your project:

fvm use 2.2.3

  1. Run your project:

flutter run

By using FVM, you can easily manage versioning for your Flutter projects. When you need to use different Flutter SDK versions in multiple projects, FVM proves to be a handy tool.

In this guide, we've covered the installation of FVM and some basic commands. For more information, you can visit the FVM GitHub page.

Flutter Sidekick Guide

What is Flutter Sidekick?

Flutter Sidekick is a tool used to enhance the development process of Flutter projects, making them more efficient and error-free. It offers a set of features that automatically organize project files, making code editing and error-fixing tasks easier. Sidekick is commonly employed to facilitate the maintenance of Flutter projects and speed up the development process with fewer errors.

Installation

To install Flutter Sidekick, follow these general steps:

  1. Go to the GitHub page: https://github.com/fluttertools/sidekick.

  2. Clone the repository to your computer or download the project as a zip file.

  3. Install the required dependencies (usually done by running a command within the project folder).

Installation steps may vary depending on the project's structure and requirements, so be sure to carefully follow the instructions provided on the Sidekick's GitHub page.

Usage

Usage of Flutter Sidekick depends on the features offered by the project. Here are some common functionalities it might provide:

  1. Code Editing: You can use Sidekick to make edits to your project. For example, you can organize imported packages automatically, format and refactor code.

  2. Error Fixing: Sidekick can automatically find and fix errors within your project.

  3. Testing: You can run automated tests using Sidekick to streamline the error-finding process.

  4. Project Analysis: Sidekick can analyze your project's performance and structural issues, suggesting improvements.

Usage steps and commands will be explained in the project's documentation and usage guide. You can find this information on the Flutter Sidekick GitHub page.

Please note that the Flutter Sidekick project may undergo continuous development and updates, so it is recommended to regularly check the GitHub page for the latest documentation and instructions.

Essential Flutter Extensions for Visual Studio Code

  1. Flutter

    • Description: Provides Flutter-specific functionality, such as widget tree visualization and Flutter project creation.

    • Extension ID: dart-code.flutter

    • Link to Extension

  2. Dart

    • Description: Adds support for the Dart programming language and provides features like code completion and syntax highlighting.

    • Extension ID: dart-code.dart-code

    • Link to Extension

  3. Awesome Flutter Snippets

    • Description: Offers a collection of helpful Flutter code snippets to accelerate your development process.

    • Extension ID: nash.awesome-flutter-snippets

    • Link to Extension

  4. Flutter Intl

    • Description: Provides internationalization support for Flutter projects, including localization and translation tools.

    • Extension ID: localizely.flutter-intl

    • Link to Extension

  5. Flutter Tree

    • Description: Renders the Flutter widget tree as a visual representation to help debug and visualize your UI.

    • Extension ID: jeroen-meijer.pubspec-assist

    • Link to Extension

  6. Pubspec Assist

    • Description: Assists with managing and editing your Flutter project's pubspec.yaml file.

    • Extension ID: jeroen-meijer.pubspec-assist

    • Link to Extension

  7. Error Lens

    • Description: Highlights errors and warnings directly in your code for easier identification.

    • Extension ID: usernamehw.errorlens

    • Link to Extension

  8. Bracket Pair Colorizer 2

    • Description: Colorizes matching brackets for better code readability.

    • Extension ID: coenraads.bracket-pair-colorizer-2

    • Link to Extension

  9. Indent-Rainbow

    • Description: Colorizes indentation levels for improved code structure visualization.

    • Extension ID: oderwat.indent-rainbow

    • Link to Extension

  10. GitLens

    • Description: Enhances the Git integration, providing more insights into code authorship and history.

    • Extension ID: eamodio.gitlens

    • Link to Extension

Dart Command Line Interface (CLI) Guide

Dart CLI (Command Line Interface) allows you to run Dart programs directly from the terminal or command prompt. It is a powerful tool that enables you to execute, build, and manage Dart applications efficiently. In this guide, we'll explore various commands and their use cases.

Table of Contents

  1. Installing Dart

  2. Running a Dart Program

  3. Compiling Dart Code

  4. Creating a Dart Project

  5. Managing Dependencies

  6. Testing Dart Code

  7. Formatting Dart Code

  8. Analyzing Dart Code

1. Installing Dart

Before using the Dart CLI, you need to install Dart on your machine. Follow these steps:

  • Windows: Download the Dart SDK installer for Windows from the official Dart website (https://dart.dev/get-dart).

  • macOS: Install Dart using Homebrew by running brew install dart.

  • Linux: Install Dart using the package manager specific to your Linux distribution. For example, on Ubuntu, run sudo apt-get install dart.

After installing Dart, you can access the Dart CLI tools from the terminal or command prompt.

2. Running a Dart Program

To run a Dart program using the CLI, navigate to the directory containing your Dart file (with the .dart extension) and use the dart command followed by the file name:

dart my_program.dart

3. Compiling Dart Code

The Dart CLI allows you to compile Dart code to native machine code for improved performance. Use the dart compile command with various options:

  • To compile a standalone executable:

dart compile exe my_program.dart

  • To compile to JavaScript for web applications:

dart compile js my_web_app.dart

4. Creating a Dart Project

To create a new Dart project, you can use the dart create command. It will generate a basic project structure for you:

dart create my_project

5. Managing Dependencies

The Dart CLI comes with a built-in package manager called pub. You can use it to manage dependencies for your Dart projects. To add a new package, run:

dart pub add package_name

To update dependencies, use:

dart pub upgrade

6. Testing Dart Code

Dart supports unit testing through the test package. To run tests for your project, use the following command:

dart test

7. Formatting Dart Code

To automatically format your Dart code for consistent style and readability, use:

dart format .

8. Analyzing Dart Code

Dart provides a static analysis tool to catch potential issues in your code. Run the analyzer using:

dart analyze

Conclusion

In this guide, we explored various Dart CLI commands and their use cases. The Dart CLI is a versatile and essential tool for developing Dart applications, allowing you to run, build, test, and manage your projects efficiently.

For more detailed information and command options, refer to the official Dart documentation at https://dart.dev/tools/dart-tool.

Flutter Pub CLI Guide

Flutter Pub CLI (Command Line Interface) provides a set of commands to interact with the Dart package manager, pub. With Flutter Pub CLI, you can manage packages, update dependencies, and publish your own packages to the Dart package repository. In this guide, we'll explore the most commonly used Flutter Pub CLI commands and their use cases.

Table of Contents

  1. Installing Flutter

  2. Managing Packages

  3. Updating Dependencies

  4. Publishing Packages

1. Installing Flutter

Before using the Flutter Pub CLI, make sure you have Flutter installed on your machine. If you haven't installed Flutter yet, refer to the installation guide in the Flutter CLI guide provided earlier.

2. Managing Packages

Adding a Package

To add a new package to your Flutter project, use the pub add command followed by the package name:

flutter pub add package_name

This will automatically update your pubspec.yaml file with the new package dependency and fetch the package.

Removing a Package

If you want to remove a package from your Flutter project, use the pub remove command followed by the package name:

flutter pub remove package_name

This will remove the package dependency from your pubspec.yaml file.

Get Package Dependencies

To fetch and download all the packages listed in your pubspec.yaml, use the get command:

flutter pub get

3. Updating Dependencies

Upgrading Packages

To update all the packages in your Flutter project to their latest versions, use the pub upgrade command:

flutter pub upgrade

Resolving Dependencies

If you want to update the dependencies of your Flutter project but still maintain compatibility with your existing code, use the pub outdated command:

flutter pub outdated

This will show you the list of packages that have newer versions available.

4. Publishing Packages

If you have developed a Dart package and want to publish it to the Dart package repository, follow these steps:

Step 1: Create a Pub Account

Before publishing, you need to create a Pub account at https://pub.dev/. Sign in with your Google account and follow the instructions.

Step 2: Prepare Your Package

Make sure your package is properly configured with a valid pubspec.yaml file and that you have followed package publishing guidelines.

Step 3: Publish

To publish your package to the Dart package repository, use the pub publish command:

flutter pub publish

This will prompt you to confirm the package publishing process. Once confirmed, your package will be published on https://pub.dev/.

Conclusion

In this guide, we explored the most common Flutter Pub CLI commands and their use cases. The Flutter Pub CLI is an essential tool for managing packages, updating dependencies, and publishing your Dart packages.

For more detailed information and command options, refer to the official Flutter Pub documentation: https://dart.dev/tools/pub/cmd.

Flutter Command Line Interface (CLI) Guide

Flutter CLI (Command Line Interface) provides powerful tools to create, manage, and deploy Flutter applications. With Flutter CLI, you can perform various tasks, such as creating new projects, running applications on different devices, managing dependencies, and more. In this guide, we'll explore the most commonly used Flutter CLI commands and their use cases.

Table of Contents

  1. Installing Flutter

  2. Creating a New Flutter Project

  3. Running a Flutter App

  4. Building a Flutter App

  5. Managing Dependencies

  6. Testing Flutter Apps

  7. Formatting Flutter Code

  8. Analyzing Flutter Code

1. Installing Flutter

Before using the Flutter CLI, you need to install Flutter on your machine. Follow these steps:

  • Step 1: Download the Flutter SDK from the official website: https://flutter.dev/docs/get-started/install.

  • Step 2: Extract the downloaded archive to a location of your choice.

  • Step 3: Add the Flutter SDK's bin directory to your system PATH variable.

Now you can access Flutter CLI tools from the terminal or command prompt.

2. Creating a New Flutter Project

To create a new Flutter project, use the flutter create command followed by the project name:

flutter create my_flutter_app

This will generate a new Flutter project with the specified name and set up the necessary files and directories.

3. Running a Flutter App

To run your Flutter app on a connected device or emulator, navigate to your project directory and use the flutter run command:

cd my_flutter_app
flutter run

The app will be built and launched on the default connected device.

4. Building a Flutter App

To build your Flutter app for release, use the flutter build command followed by the target platform:

  • For Android (APK):

flutter build apk

  • For iOS (IPA):

flutter build ios

5. Managing Dependencies

Flutter uses pub as its package manager. To add a new package to your Flutter project, use:

flutter pub add package_name

To update dependencies, use:

flutter pub upgrade

6. Testing Flutter Apps

Flutter has built-in support for testing. To run tests for your project, use the flutter test command:

flutter test

7. Formatting Flutter Code

To automatically format your Flutter code for consistent style and readability, use:

flutter format .

8. Analyzing Flutter Code

Flutter includes a static analysis tool to catch potential issues in your code. Run the analyzer using:

flutter analyze

Conclusion

In this guide, we covered the most common Flutter CLI commands and their use cases. The Flutter CLI is a powerful tool that streamlines the development and deployment of Flutter applications.

For more detailed information and command options, refer to the official Flutter documentation: https://flutter.dev/docs/get-started/flutter-for/cli.

Flutter Build Runner Guide

Flutter build_runner package is a tool used to automatically generate and manage code in Flutter applications. It is commonly used for code generation, serialization, and handling more complex structures. build_runner allows you to run custom code generators and transformers. In this guide, we will explore the usage of build_runner and various scenarios in which it can be used.

Table of Contents

  1. What is build_runner and Installation

  2. Basic Usage

  3. Code Generators and Builder Usage

  4. Serialization

  5. Generating Data Classes with Code Generators

1. What is build_runner and Installation

build_runner is a package used to manage code generation, code transformation, and build processes for Flutter projects. It allows you to automatically run code generation scripts to update and maintain your code efficiently.

To add build_runner to your Flutter project, follow these steps:

  1. Add build_runner and the appropriate version of flutter to the dev_dependencies section in your pubspec.yaml file:

dev_dependencies:
  build_runner: ^2.0.0
  flutter_test:
    sdk: flutter

  1. In the terminal, navigate to the root directory of your project and run the following command:

flutter pub get

2. Basic Usage

The basic usage of build_runner is to build and update the code using the following command:

flutter pub run build_runner build

This command will run all the code generators and transformers in your project.

3. Code Generators and Builder Usage

build_runner uses code generators and builders to automatically generate code. You can create custom builders or use builders that come with packages. To create a builder, you might also need to use the source_gen package.

For example, for JSON serialization, you can use the json_serializable and json_annotation packages. The json_serializable package provides a builder for automatically generating JSON serialization code for data classes.

4. Serialization

To automatically serialize data classes using build_runner, follow these steps:

  1. Add the json_serializable and json_annotation packages to your pubspec.yaml file:

dependencies:
  json_annotation: ^4.0.0

dev_dependencies:
  build_runner: ^2.0.0
  json_serializable: ^4.0.0

  1. Create your data class and annotate it using json_annotation:

import 'package:json_annotation/json_annotation.dart';

part 'user.g.dart';

@JsonSerializable()
class User {
  final String name;
  final int age;

  User(this.name, this.age);

  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);

  Map<String, dynamic> toJson() => _$UserToJson(this);
}

  1. In the terminal, navigate to the root directory of your project and run the following command:

flutter pub run build_runner build

After following these steps, the User class will have JSON serialization code automatically generated.

5. Generating Data Classes with Code Generators

build_runner allows you to automatically generate data classes using code generators. For example, you can use the freezed package to automatically generate data classes.

  1. Add the freezed and build_runner packages to your pubspec.yaml file:

dependencies:
  freezed: ^0.15.0

dev_dependencies:
  build_runner: ^2.0.0

  1. Create your data class and annotate it with @freezed:

import 'package:freezed_annotation/freezed_annotation.dart';

part 'user.freezed.dart';

@freezed
abstract class User with _$User {
  factory User({String? name, int? age}) = _User;
}

  1. In the terminal, navigate to the root directory of your project and run the following command:

flutter pub run build_runner build

After following these steps, the User class will have its code automatically generated.

Conclusion

In this guide, we covered the basic usage of build_runner and how to use code generators in various scenarios. build_runner is a powerful tool for managing code generation and handling complex data structures in Flutter applications.

Flutter Testing Guide

Flutter testing is a crucial part of the development process to ensure the reliability and correctness of your Flutter applications. Flutter provides different testing approaches like unit testing, widget testing, and integration testing. In this guide, we'll explore these testing types, best practices, and tools available for Flutter testing.

Table of Contents

  1. Introduction to Flutter Testing

  2. Unit Testing

  3. Widget Testing

  4. Integration Testing

  5. Best Practices for Flutter Testing

  6. Testing Tools and Libraries

  7. Additional Resources

1. Introduction to Flutter Testing

Flutter testing ensures that your application behaves as expected and meets the required functionality. Testing helps in identifying bugs early in the development cycle and improves overall code quality.

2. Unit Testing

Unit testing in Flutter focuses on testing individual functions, methods, or classes in isolation. It verifies that each unit of code (e.g., functions) works correctly. Flutter uses the test package for writing and running unit tests.

Example of a unit test in Dart:

void main() {
  test('Addition Test', () {
    expect(add(2, 3), 5);
  });
}

int add(int a, int b) {
  return a + b;
}

3. Widget Testing

Widget testing in Flutter helps test UI components and interactions in isolation. It ensures that widgets render correctly and respond as expected to user interactions. Flutter's flutter_test package provides utilities for widget testing.

Example of a widget test in Dart:

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:my_app/main.dart';

void main() {
  testWidgets('Widget Renders Correctly', (WidgetTester tester) async {
    await tester.pumpWidget(MyApp());

    expect(find.text('Hello, World!'), findsOneWidget);
  });
}

4. Integration Testing

Integration testing in Flutter is used to verify the interactions between various parts of your application, including UI components, navigation, and external dependencies. The flutter_driver package is used for running integration tests.

Example of an integration test in Dart:

void main() {
  test('Counter increments', () async {
    final driver = await FlutterDriver.connect();

    await driver.tap(find.byType(FloatingActionButton));
    await driver.waitFor(find.text('1'));

    await driver.tap(find.byType(FloatingActionButton));
    await driver.waitFor(find.text('2'));

    await driver.close();
  });
}

5. Best Practices for Flutter Testing

  • Keep tests small, focused, and isolated.

  • Use descriptive test names for better readability.

  • Utilize setUp and tearDown to set up preconditions and clean up after tests.

  • Use mock objects to simulate external dependencies.

  • Ensure tests are fast and reliable.

6. Testing Tools and Libraries

Flutter provides various tools and libraries to assist in testing:

  • flutter_test: The official testing package for writing unit and widget tests.

  • flutter_driver: Used for running integration tests.

  • mockito: A popular mocking library for creating mock objects.

7. Additional Resources

Flutter Testing with Patrol Package

Patrol is a package for Flutter that provides a set of utility functions and classes to help write tests with ease. It aims to simplify the process of writing unit, widget, and integration tests by providing various handy functions and matchers. In this guide, we'll explore the features of the patrol package and how to use it in different types of tests.

Table of Contents

  1. Introduction to Patrol Package

  2. Installation

  3. Patrol Utility Functions

  4. Patrol Matchers

  5. Examples of Using Patrol Package

  6. Conclusion

1. Introduction to Patrol Package

The patrol package is designed to make writing Flutter tests more convenient and readable. It provides a collection of utility functions and matchers that simplify test assertions, enhance test readability, and make test maintenance easier.

2. Installation

To use the patrol package, add it to your project's pubspec.yaml file:

dev_dependencies:
  patrol: ^1.0.0
  flutter_test:
    sdk: flutter

Then, run flutter pub get to fetch and install the package.

3. Patrol Utility Functions

The patrol package includes various utility functions that make testing more straightforward:

  • taps: Simulates user taps on widgets.

  • pumpAndSettle: Advances time and waits for any animations to complete.

  • findsAndEnsureOneWidget: An enhanced version of findsOneWidget that throws an error if more than one matching widget is found.

  • buildTestableWidget: A convenience function to wrap a widget with necessary widgets for testing.

  • tester: An instance of WidgetTester that allows easy access to testing functions.

4. Patrol Matchers

Patrol provides custom matchers to improve test readability:

  • isType: Matches widgets based on their runtime type.

  • hasText: Matches widgets that contain the specified text.

  • isDismissible: Matches widgets that can be dismissed, such as dialogs or snackbar widgets.

  • isNotPresent: Matches widgets that are not present in the widget tree.

5. Examples of Using Patrol Package

Widget Testing with Patrol

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:patrol/patrol.dart';

void main() {
  testWidgets('Widget Renders Correctly', (WidgetTester tester) async {
    await tester.pumpWidget(buildTestableWidget(MyApp()));

    expect(find.text('Hello, World!'), hasText('Hello, World!'));
    expect(find.byType(FloatingActionButton), isType<FloatingActionButton>());
    expect(find.byType(SnackBar), isNotPresent());

    await tester.tap(find.byType(FloatingActionButton));
    await tester.pumpAndSettle();

    expect(find.byType(SnackBar), isType<SnackBar>());
  });
}

Widget buildTestableWidget(Widget widget) {
  return MaterialApp(
    home: Scaffold(body: widget),
  );
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text('Hello, World!'),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text('Button Pressed!')),
          );
        },
      ),
    );
  }
}

6. Conclusion

The patrol package provides a range of useful utility functions and matchers that make writing Flutter tests more comfortable and expressive. By using patrol, you can write more reliable tests and improve the overall testing experience for your Flutter applications.

Getting Started with resources

This project is a starting point for a Flutter application.

A few resources to get you started if this is your first Flutter project:

For help getting started with Flutter development, view the online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.

  • signed by the author @gurkanfikretgunak

Flutter

Dart

Material Design

Flutter Packages

Author: @gurkanfikretgunak Version: 0.1.0

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