Top 50+ Flutter Test Cases [Flutter Testing Test Case Template]

OVERVIEW

Mobile devices and mobile applications are becoming increasingly prominent in our daily lives. Mobile devices are everywhere, and they are only getting more popular. As per Statista, mobile will account for more than half of the web traffic worldwide by 2021. Mobile devices (excluding tablets) contributed to 54.4 percent of global website traffic in the fourth quarter of 2021, increasing consistently over the past few years.

To support all of your users, you will need to create two separate mobile apps. These apps will require dedicated teams responsible for maintaining the app and keeping it updated. In addition, your users may want to take advantage of a bigger screen to run the Windows version of the app (or Linux or macOS). If you are working remotely, you are looking for your mobile app's desktop versions for easy access and control. Bringing this into the equation makes life very difficult for developers, testers, and managers.

Flutter is a free, open-source mobile application development framework created by Google. It uses the Dart programming language to build high-performance, high-fidelity, and beautiful apps for Android and iOS platforms and web and desktop apps. Flutter offers fast development cycles, expressive and flexible UI, and access to native APIs. It also provides a rich set of customizable widgets, tools, and animations, making it easy to create unique and visually stunning mobile apps. It features fast development cycles, expressive and flexible UI, and access to native APIs.

• What is Flutter testing?
• Why use Flutter testing?
• What are Flutter test cases?
• Testing the state management of a widget
• Testing the loading of data from a remote API
• Testing the navigation between pages
• Testing the initial state of a widget
• Testing the interaction with a widget
• Testing the integration between two widgets
• Testing the error handling of a widget
• Testing the lifecycle methods of a widget
• Testing the animation of a widget
• Testing the input validation of a form
• Testing the accessibility of a widget
• Testing the presence of a widget
• Testing the value of a widget
• Testing the form submission
• Testing a network request
• Testing widget visibility
• Testing UI layouts
• Test that the app launches without errors
• Test that all widgets render as expected
• Test that all text labels are correct
• Test that all buttons are clickable and perform the correct action
• Test that all input fields are working properly
• Test that all images are loading correctly
• Test that all animations are working as expected
• Test that the app can handle different screen sizes and orientations
• Test that the app can handle different device types, such as tablets or smartwatches
• Test that the app can handle different navigation scenarios, such as back buttons or deep links
• Test that the app can handle different authentication scenarios, such as login and logout
• Test that the app can handle database or file system interactions
• Test that the app can handle user preferences and settings
• Test that the app can handle push notifications and other system events
• Test that the app can handle local notifications and alarms
• Test that the app can handle different media types, such as audio or video
• Test that the app can handle complex data structures, such as nested objects or arrays
• Test that the app can handle different data sources, such as APIs or local storage
• Test that the app can handle data synchronization and caching
• Test that the app can handle different user roles and permissions
• Test that the app can handle accessibility and assistive technology
• Test that the app can handle security and encryption
• Test that the app can handle payment processing and transactions
• Test that the app can handle analytics and tracking
• Test that the app can handle different social media integrations
• Test that the app can handle location services and maps
• Test that the app can handle sensor data, such as accelerometer or gyroscope
• Test that the app can handle camera and microphone interactions
• Test that the app can handle different platform-specific features, such as Siri or Android Auto
• Test that the app can handle different third-party library integrations
• Test that the app can handle different build types, such as debug or release
• Test that the app can handle different environment variables and configurations
• Test that the app can handle different version control and deployment scenarios
• Test that the app can handle different app store or marketplace requirements
• Test that the app can handle different testing frameworks, such as Flutter Test or Mockito
• Test that the app can handle different debugging and profiling tools, such as Flutter Inspector or Dart DevTools
• Test that the app can handle different continuous integration and continuous delivery pipelines, such as GitHub Actions or Jenkins
• Test that the app can handle different performance and scalability requirements, such as load testing or stress testing

Flutter testing refers to testing Flutter mobile applications for bugs and other issues before they are released to the public. It is a crucial step in the software development lifecycle and helps ensure the app's quality and reliability

Flutter provides several types of testing, including unit testing, widget testing, integration testing, and end-to-end testing. Unit testing is used to test individual pieces of code, while widget testing tests individual user interface components. Integration testing tests the interactions between different parts of the app, and end-to-end testing tests the app, simulating the user's experience.

Flutter's testing framework provides developers with a comprehensive and easy-to-use set of tools for writing, running, and debugging tests. It also integrates with popular testing frameworks and tools such as JUnit testing, TestNG, and mockito testing.

Testing is an essential part of app development with Flutter, and it helps to catch and fix issues early, improve the app's performance, and ensure a positive user experience.

When you develop a Flutter app, testing is one key critical area. Most teams and developers have a strong understanding of the importance of testing but often need more experience writing good tests. A good test strategy helps ensure that current expectations and assumptions are met, increasing confidence in the product.

Because so many products use flutter, testing becomes an even more crucial part of the development to ensure that the code we write now will continue to function correctly no matter how many features we add or how many developers work on the project.

Many top companies have used Flutter to develop a fast cross-platform mobile applications. However, it's important to remember that there is no one "right" way to write tests for your Flutter apps. The kinds of tests you write depend on your unique development workflow and needs, but here are some of the most common tests to get you started:

• Unit - Testing contract and business logic.
• Widget - Testing UI separately.
• Integration - Testing is business logic breaks.
• End-to-End - Testing to verify end-user experience.
• Golden - Testing widget and when UI is locked.

Flutter test cases are tests written to verify the behavior and functionality of Flutter widgets and other components in a Flutter application. They are used to validate the expected output of a widget or component, given a set of inputs, and help to ensure that the application is working as intended.

Test cases in Flutter are typically written using the `flutter_test` package, which provides a framework for writing and running tests. The tests can be run using the flutter test command, and they can be run on both mobile emulator online and real device cloud.

Some common use cases for Flutter test cases include testing the initial state of a widget, testing the interaction with a widget, and testing the integration between different widgets and components in an application. The tests can also be used to verify the behavior of custom widgets and components, as well as the behavior of the built-in widgets provided by Flutter.

Testing the state management of a widget involves verifying the behavior of the widget when its state changes. This includes testing that the widget updates its visual representation when the state changes and responds to user interactions correctly.

For example, consider a `TextField` widget that displays an error message if the text entered by the user is not a valid email address. The test case would verify that the error message is displayed when an invalid email address is entered and disappears when a valid email address is entered.

To write this test case, you would use the`flutter_test` package to interact with the `TextField` widget. You would use the `tap` method to simulate the user entering text and the `enterText` method to enter text into the widget. Then, you would use the `expect` method to verify that the error message is displayed or hidden as expected.

Testing data loading from a remote API involves verifying that your Flutter application correctly retrieves and displays data from an API. This involves testing that the API is correctly called, that the data is correctly parsed and stored in your application, and that the data is correctly displayed on the screen.

To write this test case, you would use the `flutter_test` package to simulate the API call and to verify that the data is correctly displayed on the screen.

Testing the navigation between pages in a Flutter application involves verifying that the correct pages are displayed in response to user interactions, such as tapping a button or submitting a form.

To write this test case, you would use the `flutter_test` package to simulate user interactions, such as tapping a button and verifying that the correct pages are displayed.

Testing the initial state of a widget in Flutter involves verifying that the widget is correctly displayed when it is first created. This includes testing that the widget has the correct initial values for its properties, such as text, color, and size, and is correctly positioned on the screen.

To write this test case, you would use the `flutter_test` package to build the widget and verify its initial state.

Testing the interaction with a widget in Flutter involves verifying that the widget behaves as expected in response to user interactions, such as tapping, dragging, and scrolling. This includes testing that the widget updates its visual representation when interacting with and triggers the expected events, such as callbacks or streams.

To write this test case, you would use the `flutter_test` package to simulate user interactions, such as tapping a button and verifying the widget's behavior in response to these interactions.

Testing the integration between two widgets in Flutter involves verifying that the widgets work correctly together and communicate correctly. This includes testing that changes in one widget trigger the expected updates in the other widget and that the widgets display the correct information in response to these updates.

To write this test case, you would use the `flutter_test` package to build the widgets and verify their behavior and interaction.

Testing the error handling of a widget involves checking that the widget properly handles exceptions and displays appropriate error messages to the user. To do this, you can write a test case in Flutter using the `testWidgets` function along with the `expect` and `catchError` functions.

Testing the lifecycle methods of a widget in Flutter involves verifying that the widget's methods are called at the appropriate times during its creation, destruction, and updates. You can write a test case for this using the `testWidgets` function along with the verify function from the mock package.

A widget animation test case in Flutter testing involves testing the animation of a widget to ensure that it works as expected and meets the design specifications. This typically involves creating test scenarios that simulate the animation and verifying that the widget behaves correctly, such as moving from one position to another, fading in or out, rotating, etc. The test case should also verify that the animation is smooth and runs at the expected speed. The test aims to catch any bugs or issues that may occur during the animation process and ensure a positive user experience.

Input validation testing of a form involves verifying that the form correctly handles user input and only accepts valid data. This testing helps ensure that the form functions as intended and prevents incorrect or malicious data from entering the system. The test case should include valid and invalid input scenarios, such as entering valid or invalid data types, checking minimum and maximum lengths, validating required fields, and testing error messages. This testing aims to catch any bugs or issues with the input validation process and to ensure that the form provides a secure and user-friendly experience.

Accessibility testing of a widget in Flutter involves verifying that the widget can be used by people with disabilities, such as those who are visually impaired or hearing impaired. The goal is to ensure that the widget is usable by everyone regardless of their abilities.

The presence of a widget test case is used to verify that a particular widget exists in the widget tree of your Flutter application. In other words, it checks if the widget is present in the view hierarchy. If the test case fails, the widget is not in the widget tree, which could indicate a problem with your code. On the other hand, if the test case passes, the widget is present and functioning as expected.

Testing the value of a variable test case is used to verify the value of a particular variable in your Flutter application. This test case helps ensure that your code is working correctly and that the variables contain the expected values.

A form submission test case is a specific scenario or set of steps defined to test a form's submission process. The test case defines the inputs, expected outputs, and conditions that must be met to consider the form submission a success. This can be done manually by filling out the form with test data and verifying if the submission was successful or automatically using tools such as functional testing frameworks.

Testing a network request test case is a process of verifying that a network request in a software application is functioning correctly. It involves defining a specific scenario or set of steps that simulate a network request and verifying that the expected outputs are returned. The test case includes inputs such as the request URL, headers, and body and expected outputs such as the response status code, response body, and headers. The goal of testing a network request test case is to identify any bugs or issues that may prevent the network request from functioning as expected, ensuring reliable and efficient communication between the client and server.

Testing widget visibility in Flutter involves verifying that the widgets are displayed correctly on the screen and are visible to the user. This can be done using a testing framework such as Flutter Driver or Flutter Unit Tests. The goal of testing widget visibility is to ensure that the widgets function as expected and are visually accessible to the user. This helps to provide a positive user experience and to catch any issues that may impact the application's overall functionality.

Testing UI layouts in Flutter involves verifying that the user interface elements are positioned and sized correctly on the screen. This can be done using a testing framework such as Flutter Driver or Flutter Unit Tests. Testing UI layouts aims to ensure that the widgets are positioned and sized correctly on the screen, resulting in a visually appealing and functional user interface. This helps to catch any issues that impact the overall usability of the application and provide a positive user experience.

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Testing that the app launches without errors typically involves checking that it can start up and display its main screen without any issues or crashes. This can include verifying that all required resources, such as fonts, images, and libraries, are properly loaded and accessible and that the app's initial state and configuration are correct.

Testing that all widgets render as expected involves verifying that all app visual elements, such as buttons, text fields, images, and other UI components, are displayed correctly and in the correct position. This can include checking that all widgets are sized and spaced appropriately and have the correct styling, such as color, font, and border properties.

Testing that all text labels are correct involves verifying that all text displayed in the app, such as button labels, menu options, and error messages, is spelled correctly and uses proper grammar and punctuation. This can include checking that all text is correctly localized for the user's language and region and that any dynamic or user-generated text, such as user names or comments, is displayed accurately and consistently throughout the app.

Testing that all buttons are clickable and perform the correct action involves verifying that all interactive elements in the app, such as buttons, menus, and links, are responsive to user input and perform the expected behavior. This can include checking that all buttons can be clicked or tapped without issues and that they perform the correct action or navigate to the expected screen.

A test case for test that all input fields are working properly would verify that all input fields are functional and work correctly in the application or system being tested.

This test case verifies that the images with keys 'logoImage' and 'bannerImage' are visible on the page, loaded correctly, and displayed as expected. It does this by finding the images by their keys, verifying that they are visible, and then checking that their Image widgets have non-null image properties, which indicates that the images are loaded and can be displayed.

The test that all animations are working as expected test case verifies that the animation in the widget with key 'animatedWidget' is working correctly. It does this by finding the widget with the key, getting the animation controller, starting the animation, waiting for it to complete, and verifying that the animation has completed as expected.

The test that the app can handle different screen sizes and orientations test case verifies that the app can handle different screen sizes and orientations. It does this by setting the size of the app's surface using setSurfaceSize(), which simulates different screen sizes and orientations, and then checking that the app's UI looks as expected in both portrait and landscape modes.

The test that the app can handle different device types, such as tablets or smartwatches test case involves testing an application to ensure that it functions correctly on different devices with varying screen sizes, resolutions, and hardware capabilities. This type of testing is essential because an app that works well on one device may not work well on another.

The test that the app can handle different navigation scenarios, such as back buttons or deep links test case involves testing an application to ensure that it correctly handles different types of user navigation, including navigating back through the app's screens and handling deep links that open the app to specific content. This type of testing is important because user navigation is a critical aspect of the user experience. An app that needs to handle it properly can frustrate users and lead to negative reviews and lower ratings.

Testing an app's ability to handle different authentication scenarios involves verifying that the app can correctly and securely handle user login and logout functionality. Overall, testing different authentication scenarios aims to ensure that the app is secure and user-friendly and that users can trust it to protect their personal information.

Testing an app's ability to handle database or file system interactions involves verifying that the app is able to correctly and securely interact with the database or file system. Overall, the goal of testing database or file system interactions is to ensure that the app is reliable, efficient, and secure in handling data. It can also handle unexpected errors or issues arising during database or file system interactions.

Testing an app's ability to handle user preferences and settings involves verifying that the app can correctly and securely handle user-specific configuration options. Overall, the goal of testing user preferences and settings is to ensure that the app is user-friendly, customizable, and secure and can handle the different settings and preferences that users may want to modify to tailor their app experience.

Testing an app's ability to handle push notifications and other system events involves verifying that the app can adequately receive, display, and handle system-generated events. Overall, the goal of testing push notifications and other system events is to ensure that the app can provide users with timely and relevant information while maintaining a smooth and uninterrupted user experience.

Testing an app's ability to handle local notifications and alarms involves verifying that the app can properly create, schedule, and deliver local notifications and alarms to the user. Overall, the goal of testing local notifications and alarms is to ensure that the app can provide users with helpful reminders and alerts while maintaining a smooth and uninterrupted user experience.

Testing an app's ability to handle different media types, such as audio or video, involves verifying that the app can correctly and securely handle various media formats. Overall, the goal of testing media types is to ensure that the app provides users with a seamless and enjoyable media experience while maintaining data security and privacy.

Testing an app's ability to handle complex data structures, such as nested objects or arrays, involves verifying that the app can correctly manipulate and display complex data structures without encountering any errors or performance issues. Overall, testing complex data structures aims to ensure that the app can provide users with a smooth and efficient data manipulation and visualization experience, even when dealing with large or complex data sets.

Testing an app's ability to handle different data sources, such as APIs or local storage, involves verifying that the app can properly read, write, and manipulate data from various sources without encountering any errors or inconsistencies. Overall, testing data sources aims to ensure that the app can seamlessly read, write, and manipulate data from various sources, providing users with an accurate and reliable data-driven experience.

Testing an app's ability to handle data synchronization and caching involves verifying that the app can adequately manage and synchronize data between different sources and cache data for improved performance and user experience. Overall, the goal of testing data synchronization and caching is to ensure that the app can provide users with a seamless and reliable data-driven experience, even when dealing with intermittent connectivity or large or complex data sets.

Testing an app's ability to handle different user roles and permissions involves verifying that it can correctly authenticate and authorize users based on their assigned roles and permissions. It can also provide users with appropriate access to app features and data. Overall, the goal of testing user roles and permissions is to ensure that the app can provide users with a secure and personalized experience and adequately handle and restrict access to sensitive data and features based on user roles and permissions.

Testing an app's ability to handle accessibility and assistive technology involves verifying that people with disabilities can use the app and that it provides appropriate support for assistive technologies such as screen readers, speech recognition, or alternative input devices. Overall, the goal of testing accessibility and assistive technology is to ensure that the app can be used by the broadest possible audience, regardless of their abilities or disabilities, and that it provides a positive and inclusive user experience for all users.

Testing an app's ability to handle security and encryption involves verifying that it can adequately protect user data and communications from unauthorized access and complies with security standards and best practices. Overall, the goal of testing security and encryption is to ensure that the app can provide users with a secure and trustworthy experience and protect user data and communications from unauthorized access or malicious attacks.

Testing an app's ability to handle payment processing and transactions involves verifying that the app can properly handle and process financial transactions and complies with relevant payment processing and security standards. Overall, the goal of testing payment processing and transactions is to ensure that the app provides users with a secure and reliable payment experience and complies with relevant payment processing and security standards to protect user financial data and transactions.

Testing an app's ability to handle analytics and tracking involves verifying that it can properly collect and analyze user data and complies with relevant privacy and data protection regulations. Overall, testing analytics and tracking aim to ensure that the app can provide users with relevant and personalized experiences based on their behavior and preferences while respecting their privacy and data protection rights and complying with applicable standards and guidelines.

Testing an app's ability to handle different social media integrations involves verifying that it can properly interact and communicate with social media platforms and complies with relevant social media policies and guidelines. Overall, the goal of testing social media integrations is to ensure that the app can provide users with a seamless and engaging social media experience while complying with relevant social media policies and guidelines and protecting user privacy and data.

Testing an app's ability to handle location services and maps involves verifying that the app can properly interact and communicate with location-based services and maps and complies with relevant location-based policies and guidelines.

Testing an app's ability to handle location services and maps involves verifying that the app can adequately interact and communicate with location-based services and maps and complies with relevant location-based policies and guidelines. Overall, the goal of testing sensor data handling is to ensure that the app can provide users with relevant and engaging experiences based on their sensor data while respecting their privacy and data protection rights and complying with applicable policies and guidelines related to sensor data usage.

Testing an app's ability to handle camera and microphone interactions involves verifying that the app can properly access, capture, and process camera and microphone data. It can use this data to provide relevant and engaging user experiences. Overall, the goal of testing camera and microphone interactions is to ensure that the app can provide users with relevant and interesting experiences based on their camera and microphone data while respecting their privacy and data protection rights and complying with relevant policies and guidelines related to camera and microphone usage.

Testing an app's ability to handle different platform-specific features, such as Siri or Android Auto, involves verifying that the app can properly access, integrate, and use these features to provide a seamless and intuitive user experience.

Testing an app's ability to handle different third-party library integrations involves verifying that the app can adequately integrate and use third-party libraries to provide additional features or functionalities. Overall, the goal of testing third-party library integrations is to ensure that the app can provide users with other features or functionalities while maintaining performance, security, and compatibility with the rest of the app and complying with relevant policies and guidelines related to third-party library usage.

Testing that the app can handle different build types, such as debug or release, checks that the app works as expected in different build configurations. Testing the app's ability to handle different build types involves verifying that the app behaves as expected in both configurations. It can also handle differences such as performance optimizations, code obfuscation, and security enhancements.

Testing that the app can handle different environment variables and configurations involves checking that the app can adapt to different settings and conditions. This testing verifies that the app behaves as expected when different environment variables are set, such as when running in a development, staging, or production environment. It also involves testing that the app can handle different configurations, such as API endpoint URLs or database connection strings.

Testing that the app can handle different version control and deployment scenarios is verifying that the app works correctly in various deployment scenarios. This testing ensures that the app can handle different version control systems, such as Git or Subversion, and that it can be built and deployed correctly in different environments, such as on-premises servers, cloud-based services, or mobile devices.

Testing that the app can handle different app store or marketplace requirements ensures that the app meets the guidelines and requirements of various app stores and marketplaces. This testing involves verifying that the app meets the technical, design, and content requirements of each store or marketplace it will be listed on, such as the Apple App Store or the Google Play Store.

Testing that the app can handle different testing frameworks, such as Flutter Test or Mockito, ensures that the app can be tested using a variety of testing frameworks and tools. This testing involves verifying that the app's code is written in a way that is compatible with different testing frameworks and that the app behaves as expected when tested using these frameworks.

Testing that the app can handle different debugging and profiling tools, such as Flutter Inspector or Dart DevTools, ensures that the app can be debugged and profiled using various tools and techniques. This testing involves verifying that the app's code is written in a way that is compatible with different debugging and profiling tools and that the app behaves as expected when tested using these tools.

Testing that the app can handle different continuous integration and continuous delivery (CI/CD) pipelines, such as GitHub Actions or Jenkins, ensures that the app can be built, tested, and deployed using various CI/CD tools and platforms. This testing involves verifying that the app's code is written in a way that is compatible with different CI/CD pipelines and that the app behaves as expected when built, tested, and deployed using these pipelines.

Testing that the app can handle different performance and scalability requirements, such as load testing or stress testing, ensures that the app can perform well and handle increased traffic or usage. This testing involves verifying that the app's code and infrastructure can scale to handle increasing user traffic and data loads and that the app's performance remains acceptable under heavy loads.

Many companies today use Flutter to develop their applications and release them to millions of users. However, every application is complete with testing and verifying its functionality before release. This helps ensure good quality and good feedback from users. The recommended method for testing your Flutter apps is using a cloud-based solution with either manual or remote methods.