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1. Run the following command in your terminal. $ open -a Simulator $ flutter run Simulate for Android Make sure you have an Android emulator installed and running. Run the following command in your terminal. $ flutter run Check out Flutter's online documentation for help getting start with your Flutter Animation project. Visit Github Source Code.
2. The Best IDE for Flutter – No. 1: Android Studio Built on IntelliJ IDEA, Android Studio is a complete IDE experience for Android App Development. Built by the Official Google team, it is a unified environment where development can be done for all android devices.

1. Best Android Emulator For Flutter Android
2. Flutter Vs Code Emulator
3. Best Android Emulator For Flutter Pc
4. Best Android Emulator For Fluttershy

LD Player is The Best Android Emulator for Flutter We have tried almost all Android Emulators available at this time, starting from Bluestacks, NOX App Player, Genymotion, KoPlayer, SmartGaga, MeMu App Play and many other Android Emulators that we have tried. Flutter's hot reload helps you quickly and easily experiment, build UIs, add features, and fix bugs faster. Experience sub-second reload times without losing state on emulators, simulators, and hardware. $ flutter devices No devices detected. Run 'flutter emulators' to list and start any available device emulators. Or, if you expected your device to be detected, please run 'flutter doctor' to diagnose potential issues, or visit for troubleshooting tips. Device emulator-5554 is not authorized.

Flutter is Google's UI toolkit for building beautiful, natively compiled applications for mobile, web, and desktop from a single codebase.

In this codelab, you'll build and test a simple Flutter app. The app will use the Provider package for managing state.

• How to create widget tests using the widget testing framework
• How to create an integration test to test the app's UI and performance using the integration_test package
• How to test data classes (providers) with the help of unit tests

In this codelab, you'll start by building a simple application with a list of items. We provide the source code for you so you can get right to the testing. The app supports the following operations:

• Adding the items to favorites
• Viewing the list of favorites
• Removing items from the favorites list

What would you like to learn from this codelab?

You need two pieces of software to complete this lab: the Flutter SDK, and an editor.

You can run this codelab using any of the following devices:

• A physical device (Android or iOS) connected to your computer and set to developer mode.
• The iOS simulator. (Requires installing Xcode tools.)
• The Android emulator. (Requires setup in Android Studio.)

testing_app (instead of myapp). You'll be modifying this starter app to create the finished app.

Note: If you don't see 'New Flutter Project' as an option in your IDE, make sure that you have the plugins installed for Flutter and Dart.

In your IDE or editor, open the pubspec.yaml file. Add the following dependencies marked as new, then save the file. (You can delete the comments to make the file more readable.)

Click the Pub get button in your IDE or, at the command line, run flutter pub get from the top of the project.

If this results in an error, make sure that the indentation in your dependencies block is exactly the same as shown above, using spaces (not tabs). YAML files are sensitive to white space.

Next, you'll build out the app so that you can test it. The app contains the following files:

• lib/main.dart - the main file where the app starts
• lib/screens/home.dart - creates a list of items
• lib/screens/favorites.dart - creates the layout for the favorites list
• lib/models/favorites.dart - creates the model class for favorites list

lib/main.dart

Replace the contents of lib/main.dart with the following code:

Add the Home page in lib/screens/home.dart

Create a new directory, screens, in the lib directory and, in that newly created directory, create a new file named home.dart. In lib/screens/home.dart add the following code:

Add the Favorites page in lib/screens/favorites.dart

In the lib/screens directory create another new file named favorites.dart. In that file add the following code:

Lastly, create the Favorites model in lib/models/favorites.dart

Create a new directory, models and, in that directory, create a new file named favorites.dart. In that file add the following code:

AppBar takes you to a second screen containing the favorites list.

The app is now ready for testing. You'll start testing it from the next step.

You'll start by unit testing the favorites model. What is a unit test? A unit test verifies that every individual unit of software (often a function) performs its intended task correctly.

All the test files in a Flutter app (except for integration tests) are placed in the test directory.

Note: These instructions use the command line to run the tests. However, you can also use the options provided by VS Code and Android Studio for running unit and widget tests on your application.

test/widget_test.dart

Before you begin testing, delete the widget_test.dart file. You'll be adding your own test files.

Create a models directory in the test directory. In this new directory, create a favourites_test.dart file with the following content:

/lib directory.

The test() method takes two positional parameters: the description of the test and the callback where you actually write the test.

Test removing an item from the list. Copy and paste the following test in the same test group. Add the following code to the test file:

Run the test

If your app is running in your emulator or device, close it before continuing.

At the command line, navigate to the project's root directory and enter the following command:

If everything works, you should see a message similar to the following:

The complete test file: test/models/favorites_test.dart.

Tip: You can run all the tests in the test directory at once by running:

$ flutter test

For more information on unit testing, visit An introduction to unit testing.

In this step you'll be performing widget tests. Widget testing is unique to Flutter, where you can test each and every individual widget of your choice. This step tests the screens (HomePage and FavoritesPage) individually.

Widget testing uses the testWidget() function instead of the test() function. It also takes two parameters: the description, and the callback. But here, the callback takes a WidgetTester as an argument.

Widget tests use TestFlutterWidgetsBinding, a class that provides the same resources to your widgets that they would have in a running app (information about screen size, the ability to schedule animations, and so on), but without the actual app. Instead, a virtual environment is used to run the widget, measure it, and so on, then tests the results. Here, pumpWidget kicks off the process by telling the framework to mount and measure a particular widget just as it would in a complete application.

The widget testing framework provides finders to find widgets (for example, text(), byType(), byIcon()) and also matchers to verify the results.

Start by testing the HomePage widget.

HomePage works properly.

Create a new file in the test directory and name it home_test.dart. In the newly created file, add the following code:

createHomeScreen() function is used to create an app that loads the widget to be tested in a MaterialApp, wrapped into a ChangeNotifierProvider. The HomePage widget needs both of these widgets to be present above it in the widget tree so it can inherit from them and get access to the data they offer. This function is passed as a parameter to the pumpWidget() function.

Next, test whether the framework can find a ListView rendered onto the screen.

Note: This test is supposed to be run before the scrolling test as you are performing actions on the ListView in it. However, to give you a general idea of how widgets tests are written we wrote the scrolling test first.

Add the following code snippet to home_test.dart:

Run the test

You can run widget tests in the same way as unit tests, but using a device or an emulator allows you to watch the test running. It also gives you the ability to use hot restart.

Plug-in your device or start your emulator.

From the command line, navigate to the project's root directory and enter the following command:

If everything works you should see an output similar to the following:

Next, you'll make changes to the test file and enter Shift + R to hot restart the app and re-run all the tests.

Add more tests to the group that tests the HomePage widgets. Copy the following test to your file:

IconButton changes from Icons.favorite_border (an open heart) to Icons.favorite (a filled-in heart) and then back to Icons.favorite_border when tapped again.

Enter Shift + R. This hot restarts the app and re-runs all the tests.

The complete test file: test/home_test.dart.

Use the same process to test the FavoritesPage with the following code. Follow the same steps and run it.

flutter_testlibrary

The WidgetTester class

Integration tests are used to test how individual pieces of an app work together as a whole. The integration_test package is used to perform integration tests in Flutter. This is Flutter's version of Selenium WebDriver (generic web), Protractor (Angular), Espresso (Android), or Earl Gray (iOS). The package internally uses flutter_driver to drive the test on a device.

integration_test. In this step, you'll add the following files for integration testing:

• integration_test/driver.dart - Instruments the app
• integration_test/app_test.dart - Runs the actual tests on the app

Create a directory called integration_test in the project's root directory. In that newly created directory, create an driver.dart file and add the following code:

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integration_response_data.json after the tests are run.

app_test.dart.

ensureInitialized() function verifies if the integration test driver is initialized or not, and reinitializes it if necessary. The framePolicy when set to fullyLive from the LiveTestWidgetsFlutterBindingFramePolicy enum, is best suitable for testing heavily-animated situations.

Next, test the scrolling performance of the app and record it using the watchPerformance() function.

Paste the following code into the test group you just created:

watchPerformance() function records the actions and generates a timeline summary which is then sent back as response data to the test driver in the driver.dart file.

Next, test the add and remove operations.

Paste the following test into the same group:

Run the test

Plug-in your device or start your emulator.

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At the command line, navigate to the project's root directory and enter the following command:

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Tip:

• It is recommended that you always run performance tests on a physical Android/iOS device in profile mode as it gives you the best understanding of your app's performance.
• Using --profile on iOS requires you to have a valid Team ID to sign the code. You can remove this option from the command or use an Android device.
• The --trace-startup option can be used to avoid flushing older timeline events when the timeline gets long.

If everything works, you should see an output similar to the following:

After the test completes successfully, the build directory at the root of the project should contain one file named integration_response_data.json. It contains the response data sent back from the test while running, in this case, the scrolling_summary. Open the file with any text editor to view the information. With a more advanced setup, you could save a summary every time the test runs and create a graph of the results.

The complete test file: integration_test/app_test.dart.

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For more details on Flutter Driver (Integration) testing, visit:

Snapchat lenses download. You've completed the codelab and have learned different ways to test a Flutter app.

• How to test widgets using the widget testing framework
• How to test the app's UI using integration tests
• How to test the app's performance using integration tests
• How to test providers with the help of unit tests

To learn more about testing in Flutter, visit