UnitTest Flutter

Hi, I am Cam.

Now we’re starting with unit testing in Flutter. This is what I understand about it, and I’d love to hear your feedback.

Add the test dependency

• The test package provides the core functionality for writing tests in Dart. This is the best approach when writing packages consumed by web, server, and Flutter apps.

• Mocks are alternativer implements of real class. Ofen use library Mockito . They allow you to simulate diffirent behaviors and test to success and failure case without depending on actual external servirce such as APIs or database

• "build_runner is an automation tool for generating code in Dart/Flutter. It is not a runtime library and is only used during development."

Now, open teminal and input:

flutter pub add dev:test

flutter pub add mockito

flutter pub add --dev build_runner

Create file test

• This folder will contain the files that we will test.

• This folder will contain the files to test files in above folder.

• In this structure, i aim make the base test setup for the project clearer. You only to forcus on once thing: This folder contains all test handling files for project. :)

Create a class to test.

Note: In this project, I am trying to use Clean Architecture.
Yeah! I will start by creating a screen with 2 components:

• Handle logic: home_controller.dart

  

• Handle UI: home_screen.dart

  

  Write for class test.

  • This code tests the logic of the setPrompt function.

  • I use the group function to test alternative cases of the setPrompt function.

Result

Use Mockito to test

Here, we use Mockito to test the ApiClient in the app.

• sentMultipartRequest in the ApiClient class

• 

  Import and use the mock emulator in home_controller_test.dart

• Next, I ofen terminal and run:

  flutter pub run build_runner build This code helps me create the mock file

• Write test code for senMultipartRequest functions

  

  Result

  

  I look forward to receiving your comments to further strengthen my knowledge. Thank you!