How Do You Automate Flutter App Testing Using Appium?

• By Anwaar Anvy
• 02-12-2024
• Mobile App Development

At this time, developing high-quality apps is crucial to providing an excellent user experience. As digitalization is ruling this world, people find using apps for their routine work much easier.

It takes a lot of consideration when developing an app according to user choice. One crucial point for maintaining the app's quality is testing these apps. However, it takes time to conduct tests across various devices and platforms.

Fortunately, there are few tools available that can automate mobile app testing.

However, it makes the process less time-consuming and more efficient. In this article, we will go over Flutter. In this article, we will explore how to automate Flutter using Appium.

Overview Of Flutter

It is a robust open-source framework created by Google for building apps. Developers can create apps across multiple platforms using Flutter. In this comes mobile (iOS and Android), web, and desktop applications.

But do you know an interesting fact about it? Flutter lets you develop Android/iOS apps with just a single codebase. Flutter is an open-source framework that makes developing mobile apps for both platforms easier and faster.

Many frameworks are offering great features for mobile app development. For Android apps, developers use a framework that supports Java and Kotlin, while iOS apps rely on a framework built around Objective-C or Swift.

In this case, developers work on two different languages and frameworks for developing apps. So, Flutter makes life easier for developers by saving them time, resources, and effort.

Overview Of The Differences Between Appium And Flutter?

Apium and Flutter, both have different roles in mobile app development. Apium tools are used for testing native, hybrid, and mobile web apps. Do you developers love it so much, why? Because of its versatile solution, which offers cross-platform support.

Moreover, it uses the Selenium WebDriver system. It provides a single way to interact with mobile apps across different platforms. Its primary role is to

• Perform automated testing.
• Handle unit testing.
• Conduct integration testing.
• Execute end-to-end testing.

On the other hand, Flutter is an open-source software development tool kit. It is quite different from Appium. Flutter is a framework, not a testing tool. Its role is to develop mobile, web, and desktop applications from a single codebase.

But why do developers prefer it? Because of its ability to create visually appealing interfaces across different platforms. Apium and Flutter work together for end-to-end testing of fluter apps with different purposes. One focuses on UI development, and the other focuses on automating app testing.

Why Should You Use Appium For Flutter Testing?

Appium is known for its flexibility and adaptability. Additionally, this makes it a great tool among developers for automating Flutter app tests. Let's break down its features.

Cross-Platform

The first feature comes with its cross-platform use. With this developers can test apps for Android and iOS both. Moreover, this makes it the best choice for Flutter, as it also supports both platforms. This removes the need for different testing tools for each platform. Further, this saves developers time and effort.

Language Options

Appium testing tool supports many programming languages, including Java, Python, and Ruby. This flexible feature allows developers to choose familiar language from many options.

Moreover, it makes testing easier for developers as they are familiar with the language. So when developing an app they do not need to learn something new.

Strong Community Support

Because it is an open-source tool, it has a significantly strong community to support its development and use. Furthermore, this ensures the tool is continuously updated with new features, bug fixes, and resources.

Developers benefit from various plugins and resources shared by the community. Furthermore, it helps resolve issues more quickly and simplifies the testing time.

Complete Testing Solution

Did you know there are two types of main tests? With Appium, developers can automate these testing types, such as user interface (UI), functional, and integration tests. Moreover, this provides thorough testing options, ensuring a thorough check of each app’s part.

Why Flutter Automation Is Crucial?

Just like any other app, Flutter apps also need continuous testing. But why?

1. It helps to catch bugs or issues earlier. This is helpful to maintain the app quality and user experience.
2. Monitors the app for any new updates and helps avoid any new problems coming with the update as well.
3. Improves app performance across every device, which leads to a positive user experience.
4. It encourages communication among developers, testers, and stakeholders for faster iterations.
5. It saves a lot of development time and costs for the companies by catching issues earlier.
6. Promotes best practices and maintains cleaner, more maintainable code.
7. Allows teams to quickly respond to changing requirements without causing delays.

However, the Flutter framework comes with modern features, but it's not recommended to depend on manual testing. As the number of features and complexity is increasing, it has become challenging to test manually. Flutter automation now comes with advanced testing tools and methods. All of these contribute to improved app performance.

How To Set Up Appium For Flutter App Testing?

When using Appium for automation testing, developers must set up the right tools and environment. It may first seem complex, but following these steps makes it easy. Below we will discuss the step-by-step process, making it easier for you to start.

Step 1: Install Node.js And Appium

Because Appium runs on Node.js, the first step involves installing Node.js.

• Download Node.JS: Go to the Node.js official website and download the latest stable version.
• Install Appium: After installing Node.js, open the command prompt or any other terminal. Add and run the following command to install Appium globally.

As mentioned above, the added command will install Apium to use anywhere on the system.

Step 2: Install Appium Flutter Driver

Flutter apps need the installation of a special driver. This is because it uses its rendering engine. However, this differs from the operating ways of regular iOS and Android apps. So, here, the next step requires installing the Appium flutter driver.
In your terminal, run the following command to install the driver.

Furthermore, due to this driver, Appium understands and can control the Flutter app operation during testing.

Step 3: Install Flutter Driver in Your App

After installing Appium drive, the next step is to add the flutter driver to your app’s code. This driver helps control and interact with the app during testing. Moreover, it works like a bridge, which lets your test scripts interact with the app. It performs tasks like,

• Clicking buttons
• Entering text
• Checking if elements appear on the screen
• Navigating between different screens
• Verifying if certain features are working

To perform this,

• Open your Flutter project in your preferred code editor (like VS Code or Android Studio).
• In the root directory, you will see a file displayed as " pubspec.yaml file ".
• Now, add these dependencies under the dev_dependencies section.

dev_dependencies:
flutter_driver:
sdk: flutter

• Ensure the correct use of indentations so, that it follows the YAML formatting rules.
• Save the changes to the pubspec.yaml file.
• Run the command flutter pubget in your terminal, which installs the new dependency.

Step 4: Setting Up An Emulator Or Real Device

For the next step, you will need an iOS/Android emulator or a real device to test the app.

You can use Andriod Studio for setting up an Android emulator. The next step is to open Android Studio and go to the Android Virtual Device option. Next, create a new virtual device matching the specs of your app.

If testing for an iOS device or simulator you can install Xcode. Moreover, you can create a new iOS simulator through Xcode’s "Device Manager."

Step 5: Configure Appium Desired Capabilities

This step requires setting up desired capabilities before running any tests. Moreover, it helps guide Appium on connecting with your device and which app to test. These capabilities have information, such as the platform, device names, and the app’s path.
Here’s a simple example of how to configure desired capabilities in your code:

Step 6: Write Your Test Scripts

Now that everything is on track, the next step involves writing a test script using a preferred programming language. We have discussed earlier that Apium supports many programming languages like Java, Python, and more.

For example, if using Java, it may look like this:

Look at the example above, the test script connects with your device and launches the Flutter app.

Step 7: Start Apium Server

Before running the test, you need to start the Apium server. This server connects the test scripts and the device/emulator. Here’s how you can do it.

• You need to open a New terminal in the operating system. The terminal type depends on different operating systems, like Command Prompt, PowerShell, Terminal, etc.
• Add the following command in the terminal, and then press Enter to run.
• Once you run the command, the terminal will display the output. It will display that the Appium server has started. It will display like this.

appium

Step 8: Finally Run Testing

After following all the steps, the Apium server is now ready. So, now you can carry out the testing process. Here is how to do it.

Open (IDE): You can use any IDE where you wrote your test scripts, like IntelliJ IDEA, Eclipse, or Visual Studio Code.

Locate the Test Script: Find the Java (or any other language) file that has the test script you want to run.

Run the Script:

• If using Ide, you can run the script by clicking right on the file and then selecting Run.
• You can also run the script by opening the terminal. The next step is opening the folder where your script is saved, and typing in the following command:

Best Practices For Effective Flutter App Testing Using Appium

Every company would want its app to be robust and user-friendly, so following best practices is crucial. Let's explore the best practices to improve your testing process with Appium.

1. Always write easy test scripts. This makes the code easier and more manageable for other developers in the future.
2. Use the Flutter driver to test each widget individually. Additionally, this helps identify issues thoroughly before affecting the app.
3. Another practice is to conduct tests by running your Flutter app on both iOS and Android platforms. This step ensures the app works well across each platform/operating system.
4. Use the flutter finder to create robust selectors to target UI elements accurately. In addition, this makes your testing process more reliable and reduces false negatives.
5. Go for continuous testing with every new app build. Moreover, it helps find bugs or issues earlier, ensuring a stable app.
6. Regularly monitor the test performance and results to spot any performance issues or failures. If any problem or failure arises, developers can quickly fix it and maintain app quality.
7. You must regularly update your Appium and Flutter driver installations. Furthermore, it ensures the app has the latest features, improved performance, and testing capabilities.
8. You must consider checking your app performance under various conditions, like high user traffic or low connectivity. Conduct a simple test in each situation. This step ensures the app is functional and responsive under any condition.
9. Ensure to include user feedback in your testing process. Real user experience helps refine the app's functionality and interface.

Conclusion

Appium lets the developers thoroughly automate tests for Flutter mobile apps. This ideal testing tool ensures the app performs well by checking it regularly. There are tools like Appium Flutter Driver and Flutter Inspector that can easily spot problems and fix them before the user faces them. Furthermore, developers mostly combine Appium with the TestGrid tool to monitor automation performance.

Last but not least, we can't overlook the Flutter hot reload feature. This allows them to run tests on every new version of your app. Moreover, this also gives developers the confidence to code, knowing they have a safety net to catch problems earlier.

Lastly, selecting Appium for your Flutter app testing helps you create a smooth, high-quality app that your users will love. It’s all about making your development process easy and ensuring your app stands in today’s competitive digital world.