Unit Testing is a process where we can ensure the features and functionality work perfectly. Testing is handy for verifying the behavior of a single function, method, or class. For writing the unit test case Flutter provides a core Framework which called the Test package and if you want to add UI/Widget testing then you can use the flutter_test package.
Let’s Start the Implementation part.
1. Add the test or flutter_test dependency.
The test package provides the core functionality for writing tests in Dart
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dev_dependencies: test: |
2. Create a test file.
To create a test file we have to flow some instructions.
- Test files should always end with _test.dart
- Test files should reside inside a test folder located at the root of your Flutter application or package
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numTest_app/ lib/ num.dart test/ num_test.dart |
3. Create a class to test
Here i am implementing code that validates 10 digit mobile.
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class num { bool validateMobile(String value) { String patttern = r'(^(?:[+0]9)?[0-9]{10,12}$)'; RegExp regExp = new RegExp(patttern); if (value.length == 0) { return false; } else if (!regExp.hasMatch(value)) { return false; } return true; } } |
4. Write a test for our class
Inside the num_test.dart file writes the test code.
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void main() { test('Mobile no test', () { final counter = num(); expect(counter.validateMobile(''), false); expect(counter.validateMobile('123'), false); expect(counter.validateMobile('test'), false); expect(counter.validateMobile('1234567890'), true); }); } |
6. Run the tests
Now run the num_test.dart class.
In conclusion, I hope this code will help you better to understand Unit Testing in the flutter. If you feel any doubt or query please comment below.
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