This test will check the button text and whether the additional information is displayed.This project uses these versions of languages, frameworks, and libraries. To achieve a realistic test, we need to test the entire widget tree. Import 'package:flutter_test/flutter_test.dart' import 'package:my_app/main.dart' void main () However, you can add unit tests, or more fine-grained widget tests if you need to isolate the logic of a specific component. You don’t need to test the controller directly because it’s already tested in the unit test. It tests the controller logic indirectly. The test checks the initial counter value and verifies that it increments after tapping the ‘+’ icon. It simulates user interaction with the app. This is a critical aspect of widget testing, and a strong reason to embrace widget tests. Completing a full test as a user may take many seconds or minutes, but widget tests often execute in under a second or milliseconds. Flutter’s animations run on a fake clock so you don’t have to wait for animations to complete. See my articles on why test isolation is expensive, and how to achieve good test coverage for a more in-depth analysis of this. Unit tests may miss certain interactions and dependencies between components, which makes it much harder to test the app comprehensively. Full app widget tests take less time to build and have less maintenance over time. You will get higher test coverage with less test code. Comprehensive Coverageīy testing the entire widget tree, full app widget tests cover all UI components, ensuring that the app works as intended. This is how your users will interact with the app, so it’s important to test it this way. Widget tests can simulate things like button taps, entering text, and scrolling. Unit tests, on the other hand, focus on specific components without considering the overall user experience. Real-world Simulationįull app widget tests simulate how users would interact with the app, enabling a more accurate assessment of the app’s performance and responsiveness. You can also test on different form factors like various iOS and Android screen resolutions, or desktop resolutions. By testing the entire widget tree, you can identify issues related to rendering, layout, and user interactions that may not be apparent with unit tests. Tests UI Behaviorįull app widget testing evaluates how the UI behaves and responds to user interactions, whereas unit tests only assess the logic and functionality of controllers. The full widget tree is far more complex than a single widget, so testing a single widget is not enough to ensure that the app works as intended. If we focus on testing a single widget, we do not combine the various moving parts of your app such as hierarchical state or controllers. You can consider these to be implementation details that are not visible to the user.įurthermore, it tests the app with all of its state. In contrast, unit tests focus on testing the logic of individual components, such as functions and classes, without taking the UI into account. You can test actual use cases that the user experiences and detect potential issues that may arise from widget interactions. This ensures that you test the app’s UI comprehensively. Full app widget testing involves testing the entire widget tree instead of isolating parts of the app. Widgets form the backbone of the application. Why Full App Widget Testing?įlutter apps are primarily about the UI. This allows you to verify that the whole app works as intended This post will also provide code examples, discuss dependency injection, and explore the broader concepts of automated testing and UI behavior. Full app widget tests test the entire widget tree instead of focusing on a single widget. This blog post takes a deep dive into the advantages of full app widget testing and explains how it’s more comprehensive than unit testing for controllers. While this can sometimes be useful for isolating the logic, it does not test the UI, and this is the most important part of a Flutter app. Unit testing focuses on testing the logic of individual components of an application. Flutter has several types of tests, including unit tests, widget tests, and integration tests. It ensures the quality and reliability of an app and allows you to make changes over time without the fear of bugs occurring. Testing is a critical aspect of software development. Book a session to learn how to test your Flutter apps. I offer full widget testing training for your team.
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