Ozzie is your testing friend. Ozzie will take an screenshot during integration tests whenever you need. Ozzie will capture performance reports for you.

Add ozzie to your pubspec.yaml as a dev_dependency:

dev_dependencies:
  ozzie: <latest_version_here>

In your Flutter integration tests, create an instance of Ozzie, pass the FlutterDriver, give it a groupName and ask it to takeScreenshot. That simple! And whenever you have finished with tests, you can create an HTML report by asking Ozzie to generateHtmlReport.

If you want to measure the performance of your app, simple wrap your integration tests in profilePerformance and it will be added to the HTML report.

Here's an example:

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('initial counter is 0', () async {
    await ozzie.profilePerformance('counter1', () async {
      await driver.tap(find.byType('FloatingActionButton'));
      await driver.waitFor(find.text('1'));
      await ozzie.takeScreenshot('counter_is_1');
    });
  });
}

After this, a report will be generated inside your project as ozzie/index.html:

You can declare, at the root of your project, an ozzie.yaml file to control the different thresholds of your performance tests. If this file is not declared, Ozzie will use internal default values:

ozzie.yaml:

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

Taking screenshots can take a while, and sometimes you might want to run your integration tests without taking screenshots. If that's the case, you can set shouldTakeScreenshots to false and skip that part, saving you some precious time:

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

Project Lead(s):

• Tim Chabot

Main Maintainer(s):

• Jorge Coca (@jorgecoca)
• Felix Angelov (@felangel)

Copyright 2018 Jorge Coca

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.