Unit Testing

What is testing

• Ensuring that the app does exactly what it should.
• Verifying that the actual software product matches expected requirements.

Why do we need testing

• To discover defects before the delivery to the client.
• To reduce flaws in the component or system.
• To increase the overall quality of the software.

Main types of testing

• Manual.
• Automated.

Tests in flutter

• Unit test.
• Widget test.
• Integration test.

Unit test

• For all code besides the UI widgets.
• One set of unit tests usually tests a single function, method or class.
• Easier to write and runs faster.

Widget test

• For testing a single widget.
• Runs on a simulated UI environment.
• It involves multiple classes and requires a test environment that provides the appropriate widget lifecycle context.

Integration test

• For testing the complete app or large parts of the app from the user's perspective
• To verify that all the widgets and services being tested work together as expected
• It can be used to verify your app’s performance
• Runs on an emulator, simulator or a real device
• It's hard to write and runs slower

AAA pattern

• Arrange(setup everything that is going to be used in the test)
• Act(call the specific method or make the change that we want to test)
• Assert(compare expected value with actual value)

Documentation

Flutter Testing Documentation