🧪 Unit Test Generator

Unit Test Generator automatically creates unit test templates (with the Arrange–Act–Assert pattern) for your
Dart and Flutter projects — especially for repositories, remote data sources, and use cases.

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Features

✅ Detects classes ending with:

• Repository
• RemoteDataSource
• UseCase

✅ Generates .test.dart files with:

• AAA structure (Arrange – Act – Assert)
• Grouped test blocks per class
• Fake variable setup for common parameter types
• Ready-to-use flutter_test and mockito imports

✅ Works with both Dart and Flutter projects.

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Installation

Add the package to your dev_dependencies:

dev_dependencies:
  my_test_generator: ^1.0.0
  build_runner: ^2.4.9

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Usage

Run the code generator:

flutter pub run build_runner build

or keep it running while you code:

flutter pub run build_runner watch

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Example

  class UserRepository {
  Future<String> getUser(int id) async => 'User $id';
  Future<void> saveUser(String name) async {}
}

The Generated File Will Be like this

// lib/data/repositories/user_repository.test.dart
// GENERATED CODE - DO NOT MODIFY BY HAND

import 'package:flutter_test/flutter_test.dart';
import 'package:mockito/mockito.dart';
import 'package:my_app/data/repositories/user_repository.dart';

void main() {
  group('UserRepositoryTest', () {
    late UserRepository instance;

    setUp(() {
      instance = UserRepository();
    });

    test('should call getUser', () async {
      // Arrange
      const int id = 1;

      // Act
      final result = await instance.getUser(id);

      // Assert
      expect(result, isNotNull);
    });

    test('should call saveUser', () async {
      // Arrange
      const String name = 'test_name';

      // Act
      await instance.saveUser(name);

      // Assert
      // Verify interactions or side effects
    });
  });
}

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How It Works

unit_test_generator uses the Dart build system and source_gen to:

1- Parse your code using the analyzer API. 2- Detect public methods inside target classes. 3- Automatically generate matching unit test templates with AAA comments. 4- Save them as .test.dart files beside the original source file.

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AAA Pattern

Each test follows the Arrange → Act → Assert pattern:

test('should fetch data', () async {
// Arrange
const int id = 1;

// Act
final result = await instance.fetchData(id);

// Assert
expect(result, isNotNull);
});

Libraries

unit_test_generator