Welcome to the world of Flutter testing with Ozzie, your dedicated friend for integration tests! In this article, we will explore how to implement Ozzie to take screenshots and generate performance reports, keeping your app in top shape. Let’s dive in!

What is Ozzie?

Ozzie is a Flutter package that simplifies the testing process by automatically taking screenshots during integration tests and capturing performance reports. With Ozzie around, you can focus on building amazing apps while maintaining quality through thorough testing.

How to Set Up Ozzie

Setting up Ozzie is straightforward. Follow these steps:

• Open your pubspec.yaml file.
• Add Ozzie as a dev_dependency:

dev_dependencies:
  ozzie: latest_version_here

• That’s it! You’re all set to start using Ozzie in your Flutter integration tests.

Using Ozzie in Your Tests

Now that Ozzie is set up, let’s see how to use it in your integration tests by creating a simple analogy.

Imagine you are the director of a theater production, and your job is to capture the magic of your play (the app) as it unfolds on stage (during tests). Ozzie, in this scenario, acts like your personal assistant. Your personal assistant’s job would be to click pictures (take screenshots), make sure the performance is smooth (track performance), and at the end, compile everything into a nice show report (generate an HTML report). Here’s how you work together:

import 'package:flutter_driver/flutter_driver.dart';
import 'package:test/test.dart';
import 'package:ozzie/ozzie.dart';

void main() {
  FlutterDriver driver;
  Ozzie ozzie;

  setUpAll(() async {
    driver = await FlutterDriver.connect();
    ozzie = Ozzie.initWith(driver, groupName: 'counter');
  });

  tearDownAll(() async {
    if (driver != null) driver.close();
    ozzie.generateHtmlReport();
  });

  test('initial counter is 0', () async {
    await ozzie.profilePerformance('counter0', () async {
      await driver.waitFor(find.text('0'));
      await ozzie.takeScreenshot('initial_counter_is_0');
    });
  });

  test('after button tap counter is 1', () async {
    await ozzie.profilePerformance('counter1', () async {
      await driver.tap(find.byType(FloatingActionButton));
      await driver.waitFor(find.text('1'));
      await ozzie.takeScreenshot('counter_is_1');
    });
  });
}

In this code, you initiate a Flutter driver, set up Ozzie, conduct your tests while profiling the performance, and take screenshots whenever necessary. After completing the tests, you wrap everything up with a comprehensive performance report.

Managing Performance Thresholds

To help you control various performance metrics, you can create an ozzie.yaml file at the root of your project. This allows you to override default threshold values used by Ozzie.

integration_test_expectations:
  should_fail_build_on_warning: true
  should_fail_build_on_error: true

performance_metrics:
  missed_frames_threshold:
    warning_percentage: 5.0
    error_percentage: 10.0
  frame_build_rate_threshold:
    warning_time_in_millis: 14.0
    error_time_in_millis: 16.0
  frame_rasterizer_rate_threshold:
    warning_time_in_millis: 14.0
    error_time_in_millis: 16.0

Optional: Skipping Screenshots

If screenshots take too long and you wish to skip them during certain tests, you can easily manage that by modifying the initialization as follows:

setUpAll(() async {
  driver = await FlutterDriver.connect();
  ozzie = Ozzie.initWith(
    driver,
    groupName: 'counter',
    shouldTakeScreenshots: false,
  );
});

Troubleshooting Ozzie

Encountering issues? Here are some troubleshooting tips:

• If Ozzie fails to take screenshots: Ensure that the FlutterDriver is properly connected and that you have passed the correct parameters while initializing Ozzie.
• Performance data not appearing in reports: Double-check the performance profiling setup in your tests and ensure that you are calling profilePerformance method correctly.
• HTML report not generating: Confirm you’ve called generateHtmlReport() in the tearDownAll section of your tests.

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Conclusion

With Ozzie by your side, testing your Flutter applications becomes a breeze. It enhances your workflow by taking care of screenshots and performance reports efficiently. Take the plunge and start using Ozzie in your next Flutter project!

At fxis.ai, we believe that such advancements are crucial for the future of AI, as they enable more comprehensive and effective solutions. Our team is continually exploring new methodologies to push the envelope in artificial intelligence, ensuring that our clients benefit from the latest technological innovations.