dart-add-unit-testlisted

# Testing Dart and Flutter Applications ## Contents - [Structuring Test Files](#structuring-test-files) - [Writing Tests](#writing-tests) - [Executing Tests](#executing-tests) - [Test Implementation Workflow](#test-implementation-workflow) - [Examples](#examples) ## Structuring Test Files Organize test files to mirror the `lib` directory structure to maintain predictability. * Place all test code within the `test` directory at the root of the package. * Append `_test.dart` to the end of all test file names (e.g., `lib/src/utils.dart` should be tested in `test/src/utils_test.dart`). * If writing integration tests, place them in an `integration_test` directory at the root of the package. ## Writing Tests Utilize `package:test` as the standard testing library for Dart applications. * Import `package:test/test.dart` (or `package:flutter_test/flutter_test.dart` for Flutter). * Group related tests using the `group()` function to provide shared context. * Define individual test cases using the `test()` function. * Validate outcomes using the `expect()` function alongside matchers (e.g., `equals()`, `isTrue`, `throwsA()`). * Write asynchronous tests using standard `async`/`await` syntax. The test runner automatically waits for the `Future` to complete. * Manage test setup and teardown using `setUp()` and `tearDown()` callbacks. * If testing code that relies on dependency injection, use `package:mockito` alongside `package:test` to generate mock objects, configure fixed scenarios