screenshots

Description:

screenshots

A screenshot image with overlaid status bar placed in a device frame.
For an example of images generated with Screenshots on a live app in both stores see:


See a demo of Screenshots in action:

For introduction to Screenshots see https://medium.com/@nocnoc/automated-screenshots-for-flutter-f78be70cd5fd.
Screenshots #
Screenshots is a standalone command line utility and package for capturing screenshot images for Flutter.
Screenshots will start the required android emulators and iOS simulators (or find attached devices), run your screen capture tests on each emulator/simulator (or device), process the images, and drop them off to Fastlane for delivery to both stores.
It is inspired by three tools from Fastlane:

Snapshots
This is used to capture screenshots on iOS using iOS UI Tests.
Screengrab
This captures screenshots on android using Android Espresso tests.
FrameIt
This is used to place captured iOS screenshots in a device frame.

Since all three of these Fastlane tools do not work with Flutter, Screenshots combines key features of these Fastlane tools into one tool.
Features #
Since Flutter integration testing is designed to work transparently across iOS and Android, capturing images using Screenshots is easy.
Features include:

Works with your existing tests
Add a single line for each screenshot.
Run your tests on any device
Select the devices you want to run on, using a convenient config file. Screenshots will find the devices (real or emulated) and run your tests.
One run for both platforms
Screenshots runs your tests on both iOS and Android in one run.
(as opposed to making separate Snapshots and Screengrab runs)
One run for multiple locales
If your app supports multiple locales, Screenshots will optionally set the locales listed in the config file before running each test.
One run for frames
Optionally places images in device frames in same run.
(as opposed to making separate FrameIt runs... which supports iOS only)
One run for clean status bars
Every image that Screenshots generates has a clean status bar.
(no need to run a separate stage to clean-up status bars)
Works with Fastlane
Screenshots drops-off images where Fastlane expects to find them. Fastlane's deliver and supply can then be used to upload to respective stores.
Works with FrameIt
Works with Fastlane's FrameIt text and background feature to add text, etc... to a framed screenshot generated by screenshots.
Works with any attached real devices
Use any number of real devices to capture screenshots.

Additional automation features:

Screenshots runs in the cloud.
For live demo of Screenshots running with the internationalized example app on macOS, linux and windows in cloud, see below
Screenshots works with any CI/CD tool.
For live demo of uploading images, generated by Screenshots, to both store consoles, see demo of Fledge at https://github.com/mmcc007/fledge#demo

Installation #
On macOS:
brew update && brew install imagemagick
pub global activate screenshots
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On linux:
# Debian, Ubuntu or Linux Mint
sudo apt-get install imagemagick
# Fedora, CentOS or RHEL
sudo yum install ImageMagick
# OpenSUSE
sudo zypper install imagemagick

pub global activate screenshots
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Note: on linux ImageMagick is often already installed.
On windows:
choco install imagemagick.app
pub global activate screenshots
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Note: ImageMagick v7 or later is recommended on windows.
If pub is not found, add to PATH using:
On macOS/Linux:
export PATH="<path to flutter installation directory>/bin/cache/dart-sdk/bin:$PATH"
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On windows:
set PATH=<path to flutter installation directory>\flutter\bin\cache\dart-sdk\bin;%APPDATA%\Pub\Cache\bin;%PATH%
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Note: if running on Windows or Linux, can only run android devices/emulators. To also run on macOS use a CI that supports macOS.
Usage #
screenshots
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Or, if using a config file other than the default 'screenshots.yaml':
screenshots -c <path to config file>
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Other options:
usage: screenshots [-h] [-c <config file>] [-m <normal|recording|comparison|archive>] [-f <flavor>] [-b <true|false>] [-v]

sample usage: screenshots

-c, --config=<screenshots.yaml> Path to config file.
(defaults to "screenshots.yaml")

-m, --mode=<normal|recording|comparison|archive> If mode is recording, screenshots will be saved for later comparison.
If mode is comparison, screenshots will be compared with recorded.
If mode is archive, screenshots will be archived (and cannot be uploaded via fastlane).
[normal (default), recording, comparison, archive]

-f, --flavor=<flavor name> Flavor name.
-b, --build=<true|false> Force build and install of app for all devices.
Override settings in screenshots.yaml (if any).
[true, false]

-v, --verbose Noisy logging, including all shell commands executed.
-h, --help Display this help information.
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Modifying your tests for Screenshots #
A special function is provided in the Screenshots package that is called by the test each time you want to capture a screenshot.
Screenshots will then process the images appropriately during a Screenshots run.
To capture screenshots in your tests:

Include the Screenshots package in your pubspec.yaml's dev_dependencies section
screenshots: ^<current version>
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In your tests

Import the dependencies
import 'package:screenshots/screenshots.dart';
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Create the config at start of test
final config = Config();
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Throughout the test make calls to capture screenshots
await screenshot(driver, config, 'myscreenshot1');
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Note: make sure your screenshot names are unique across all your tests.
Note: to turn off the debug banner on your screens, in your integration test's main(), call:
WidgetsApp.debugAllowBannerOverride = false; // remove debug banner for screenshots
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Modifying tests based on screenshots environment #
In some cases it is useful to know what device, device type, screen size, screen orientation and locale you are currently testing with. To obtain this information in your test use:
final screenshotsEnv = config.screenshotsEnv;
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See https://github.com/flutter/flutter/issues/31609 for related flutter driver issue.
Configuration #
Screenshots uses a configuration file to configure a run.
The default config filename is screenshots.yaml:
# A list of screen capture tests
tests:
# Note: flutter driver expects a pair of files eg, main1.dart and main1_test.dart
- test_driver/main1.dart
- test_driver/main2.dart

# Interim location of screenshots from tests
staging: /tmp/screenshots

# A list of locales supported by the app
locales:
- en-US
- de-DE

# A map of devices to emulate
devices:
ios:
iPhone XS Max:
frame: false
iPad Pro (12.9-inch) (3rd generation):
orientation: LandscapeRight
android:
Nexus 6P:

# Frame screenshots
frame: true
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Device Parameters #
Individual devices can be configured in screenshots.yaml by specifying per device parameters.



Parameter
Values
Required
Description




frame
true/false
optional
Controls whether screenshots generated on the device should be placed in a frame. Overrides the global frame setting (see example screenshots.yaml above).


orientation
Portrait | LandscapeRight | PortraitUpsideDown | LandscapeLeft
optional
Controls orientation of device during test. Disables framing resulting in a raw screenshot. Ignored for real devices.


build
true(default)/false
optional
Builds and installs app. When set to false, can be used for pre-installed apps that need to be configured before running tests.



frame parameter notes:

images generated for devices where framing is disabled may not be suitable for upload.
set to true for devices unknown to screenshots.

orientation parameter notes:

orientation on iOS simulators is implemented using an AppleScript script which requires granting permission on first use.

Test Options #
In addition to using the default flutter driver mode, tests can also be specified using flutter driver parameters. For example:
tests:
- --target=test_driver/main1.dart --driver=test_driver/main1_test1.dart
- --target=test_driver/main2.dart --driver=test_driver/main2_test1.dart
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Record/Compare Mode #
Screenshots can be used to monitor any unexpected changes to the UI by comparing the new screenshots to previously recorded screenshots. Any differences will be highlighted in a 'diff' image for review.
To use this feature:

Add the location of your recording directory to a screenshots.yaml
recording: /tmp/screenshots_record
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Run a recording to capture your screenshots:
screenshots -m recording
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Run subsequent Screenshots with:
screenshots -m comparison
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Screenshots will compare the new screenshots with the recorded screenshots and generate a 'diff' image for each screenshot that does not compare. The diff image highlights the differences in red.

Archive Mode #
To generate screenshots for local use, such as generating reports of changes to UI over time, etc... use 'archive' mode.
To enable this mode:

Add the location of your archive directory to screenshots.yaml:
archive: /tmp/screenshots_archive
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Run Screenshots with:
$ screenshots -m archive
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Integration with Fastlane #
Since Screenshots is intended to be used with Fastlane, after Screenshots completes, the images can be found in your project at:
android/fastlane/metadata/android
ios/fastlane/screenshots
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Images are in a format suitable for upload via deliver
and supply.
Tip: One way to use Screenshots with Fastlane is to call Screenshots before calling Fastlane (or optionally call from Fastlane). Fastlane (for either iOS or Android) will then find the images in the appropriate place.
(For a live demo of using Fastlane to upload screenshot images to both store consoles, see demo of Fledge at https://github.com/mmcc007/fledge#demo)
Fastlane FrameIt #
iOS images generated by Screenshots can also be further processed using FrameIt's text and background feature.
Changing devices #
To change the devices to run your tests on, just change the list of devices in screenshots.yaml.
Make sure each device you select has a supported screen and a
corresponding attached device or installed emulator/simulator. To bypass
the supported screen requirement use frame: false for each related device in your
screenshots.yaml.
For each selected device:

Confirm device is present in screens.yaml.
Add device to the list of devices in screenshots.yaml.
Confirm a real device is attached, or install an emulator/simulator for device.

If your device is not found in screens.yaml but matches a screen size in screens.yaml, please create an issue or PR to add the device to screens.yaml.
Config validation #
Screenshots will check your configuration before running for any errors and provide a guide on how to resolve.
Adding new screens #
If your device does not have a screen in screens.yaml please create an issue to request a new screen.
If you want to submit a new screen please see related README.
Upgrading #
To upgrade, simply re-issue the install command
$ pub global activate screenshots
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Note: the Screenshots version should be the same for both the command line and in your pubspec.yaml.

If upgrading the command line version of Screenshots, also upgrade
the version of Screenshots in your pubspec.yaml.
If upgrading the version of Screenshots in your pubspec.yaml, also upgrade the command line version.

To check the version of Screenshots currently installed:
pub global list
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Sample run on Travis and Appveyor #
To view Screenshots running with the internationalized example app on macOS and linux in the cloud see:
https://travis-ci.com/mmcc007/screenshots
To view the images generated by Screenshots during a run on travis see:
https://github.com/mmcc007/screenshots/releases/
To view a similar run on windows see:
https://ci.appveyor.com/project/mmcc007/screenshots

Running Screenshots in the cloud is useful for automating the generation of your screenshots in a CI/CD environment.
Running Screenshots on macOS in the cloud can be used to generate your screenshots when developing on Linux and/or Windows (if not using locally attached iOS devices).

Related projects #
To run integration tests on real devices in cloud:
https://github.com/mmcc007/sylph
To automate releases to both stores:
https://github.com/mmcc007/fledge
Issues and Pull Requests #
Issues and
pull requests are welcome.
Your feedback is welcome and is used to guide where development effort is focused. So feel free to create as many issues and pull requests as you want. You should expect a timely and considered response.