UNIT TESTING IN FLUTTER

Unit testing is a software development process in which the smallest testable parts of an application, called units, are individually and independently scrutinised for proper operation.

Unit testing verifies if a single method or class works as expected. It also improves maintainability by confirming if existing logic still works when new changes are made. Generally, unit tests are easy to write but run in a test environment.

Unit testing is testing the smallest testable unit of an application. It is done during the coding phase by the developers. To perform unit testing, a developer writes a piece of code (unit tests) to verify the code to be tested (unit) is correct.

What are types of unit testing?

There are two main types of unit tests: manual and automation. Both types are used to verify specific components of the system being tested. Unit testing improves program efficiency by ensuring that the individual components all work as intended.

Objective of Unit Testing:

To verify the correctness of the code. To test every function and procedure. To fix bugs early in the development cycle and to save costs. To help the developers to understand the code base and enable them to make changes quickly.

Steps for Unit Test in flutter :

The test package provides the core framework for writing unit tests, and the flutter_test package provides additional utilities for testing widgets.

There are following steps in below:

1. Add the test or flutter_test dependency.

dev_dependencies:

 test: <latest_version>

1. Create a test file.
2. Create a class to test.
3. Write a test for our class.
4. Combine multiple tests in a group.
5. Run the tests.

Run tests using IntelliJ or VSCode

1. Open the counter_test.dart file.
2. Select the Run menu.
3. Click the Run 'tests in counter_test.dart' option.
4. Alternatively, use the appropriate keyboard shortcut for your platform.

Run tests in a terminal

flutter test test/counter_test.dart

For more options regarding unit tests, you can execute this command:

flutter test --help.

Benefits of Unit Testing :

1. It helps you find bugs even before actual users find them.
2. it helps you maintain a scalable code.
3. it helps you ensure that an updated code doesn’t break any existing functionality.
4. it helps you become a better developer👌