screenshots 1.2.0

pub package Build Status

alt text

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:
GitErDone GitErDone

See a demo of Screenshots in action: Screenshots demo

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:

  1. Snapshots
    This is used to capture screenshots on iOS using iOS UI Tests.
  2. Screengrab
    This captures screenshots on android using Android Espresso tests.
  3. 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:

  1. Works with your existing tests
    Add a single line for each screenshot.
  2. 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.
  3. 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)
  4. 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.
  5. One run for frames
    Optionally places images in device frames in same run.
    (as opposed to making separate FrameIt runs... which supports iOS only)
  6. 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)
  7. 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.
  8. Works with FrameIt
    Works with Fastlane's FrameIt text and background feature to add text, etc... to a framed screenshot generated by screenshots.
  9. Works with any attached real devices
    Use any number of real devices to capture screenshots.

Additional automation features:

  1. Screenshots runs in the cloud.
    For live demo of Screenshots running with the internationalized example app on macOS in cloud, see below
  2. 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

Note:
If pub is not found, add to PATH using:

export PATH="$PATH:<path to flutter installation directory>/bin/cache/dart-sdk/bin"

Usage #

$ screenshots

Or, if using a config file other than the default 'screenshots.yaml':

$ screenshots -c <path to config file>

Other options:

$ screenshots -h
usage: screenshots [-h] [-c <config file>] [-m <normal|recording|comparison|archive>]

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 archive, screenshots will be archived and cannot be uploaded via fastlane.
                                                    [normal (default), recording, comparison, archive]

-h, --help                                          Display this help information.

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:

  1. Include the Screenshots package in your pubspec.yaml's dev_dependencies section
      screenshots: ^<current version>
    
  2. In your tests
    1. Import the dependencies
      import 'package:screenshots/screenshots.dart';
      
    2. Create the config at start of test
           final configInfo = Config().configInfo;
      
    3. Throughout the test make calls to capture screenshots
          await screenshot(driver, configInfo, 'myscreenshot1');
      

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

Modifying tests based on screenshots environment #

In some cases it is useful to know what device, device type, screen size and locale you are currently testing with. To obtain this information in your test use:

final screenshotsEnv = config.screenshotsEnv;

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:
  - test_driver/main1.dart
  - test_driver/main2.dart

# Note: flutter driver expects a pair of files for testing
# For example:
#   main1.dart is the test app (that calls your app)
#   main1_test.dart is the matching test that flutter driver 
#   expects to find.

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

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

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

# Frame screenshots
frame: true

Device Parameters #

Individual devices can be configured in screenshots.yaml by specifying per device parameters.

ParameterValuesRequiredDescription
frametrue/falseoptionalControls whether screenshots generated on the device should be placed in a frame. Overrides the global frame setting (see example screenshots.yaml above).

Note: images generated for those devices where framing is disabled are probably not suitable for upload, but can be used for local review.

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:

  1. Add the location of your recording directory to a screenshots.yaml
     recording: /tmp/screenshots_record
    
  2. Run a recording to capture your screenshots:
     screenshots -m recording
    
  3. Run subsequent Screenshots with:
     screenshots -m comparison
    
    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:

  1. Add the location of your archive directory to screenshots.yaml:
     archive: /tmp/screenshots_archive
    
  2. Run Screenshots with:
     $ screenshots -m archive
    

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

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:

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

Config validation #

Screenshots will check your configuration before running for any errors and provide a guide on how to resolve.

Upgrading #

To upgrade, simply re-issue the install command

$ pub global activate screenshots

Note: the Screenshots version should be the same for both the command line and in your pubspec.yaml.

  1. If upgrading the command line version of Screenshots, also upgrade the version of Screenshots in your pubspec.yaml.
  2. 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

Sample run on Travis #

To view Screenshots running with the internationalized example app on macOS in the cloud see:
https://travis-ci.com/mmcc007/screenshots

To view the images generated by Screenshots during run on travis see:
https://github.com/mmcc007/screenshots/releases/

  • 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).

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.

1.2.0 #

  • Added archive feature to collect screenshots of all runs for reporting, etc... #77 #81
  • Improved detection of adb path #85

1.1.1 #

  • Fixed localization issue in test #19, #20
  • Improved handling of locale for emulators and real devices

1.1.0 #

  • Added record/compare feature to compare screenshots with previously recorded screenshots during a run. #65

1.0.2 #

  • Fixed bug with parsing ios simulator info #73

1.0.1 #

  • Fixed pedantic lint errors

1.0.0 #

  • Added support for running on any device (real, emulator or simulator), whether booted or not, even if there are no supported screens (this requires marking unsupported devices with 'frame: false').
  • Added support for FrameIt 'text and background' feature #61
  • Removed requirement that no devices/emulators be running at startup #63
  • Allow screenshots to be configured with multiple locales and deliberately run into flutter driver bug (with warning) #20
  • Added feature to use running emulators/simulators or boot required ones #56
  • Added flutter tools daemon to manage real devices, android emulators, and manage boot state of emulators and ios simulators
  • Added wait-for-event to daemon client (for use in waiting for emulator to shutdown)
  • Added wait-for-locale-change using syslog
  • Re-organized as library
  • Changed from using positional optional params to named optional params in public API (breaking change)

0.2.1 #

  • Added support for iPhone Xs and iPhone Xs Max

0.2.0 #

  • Added option to control framing at device level
    (breaking change)
  • Added screen for iPad Pro (12.9-inch) (3rd generation)

0.1.8 #

  • Added support default screen for android tablet
  • Added feature to make screenshots environment available to tests
  • Improved messaging in validator
  • Added feature to auto-select black/white color of statusbar
  • Added feature to set default background color
  • Fixed problem with selecting simulators when no default available

0.1.7 #

  • Added check for highest available android emulator for a device
  • Added check for 'adb' in PATH

0.1.6 #

  • Improved handling of iOS simulator info provided by Apple

0.1.5 #

  • Updated parser for iOS simulators to work with all Apple machines
  • Added check for no running emulators and simulators on startup
  • Added check to wait for emulator to stop

0.1.4 #

0.1.3 #

  • Added support for multiple locales and additional screens for devices

0.1.2 #

  • Added configuration validation

0.1.1 #

  • Fixed parsing of simulator info on some MacOS's

0.1.0 #

  • Cleanup and release

0.0.2 #

  • Added support for iPad screenshots

0.0.1 #

  • Initial version

example/README.md

example #

The default counter app with internationalization support.

Getting Started with screenshots.

This is an app that demonstrates screenshots.

First confirm devices are attached or emulators/simulators are installed for the following devices:

# A list of devices to run tests on
devices:
  ios:
    iPhone XS Max:
    iPad Pro (12.9-inch) (2nd generation):
      frame: false
  android:
    Nexus 6P:

Then run with:

$ screenshots

The generated screenshots can be found in:

android/fastlane/metadata/android
ios/fastlane/screenshots

See screenshots in action!

To view screenshots running with this example app on travis see:
https://travis-ci.com/mmcc007/screenshots

To download the images generated by screenshots during run on travis see:
https://github.com/mmcc007/screenshots/releases/

Use this package as an executable

1. Install it

You can install the package from the command line:


$ pub global activate screenshots

2. Use it

The package has the following executables:


$ screenshots

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:


dependencies:
  screenshots: ^1.2.0

2. Install it

You can install packages from the command line:

with pub:


$ pub get

with Flutter:


$ flutter pub get

Alternatively, your editor might support pub get or flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:


import 'package:screenshots/screenshots.dart';
  
Popularity:
Describes how popular the package is relative to other packages. [more]
78
Health:
Code health derived from static analysis. [more]
100
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
100
Overall:
Weighted score of the above. [more]
89
Learn more about scoring.

We analyzed this package on Jul 17, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.4.0
  • pana: 0.12.19

Platforms

Detected platforms: Flutter, other

Primary library: package:screenshots/screenshots.dart with components: io, isolate.

Health suggestions

Fix lib/src/archive.dart. (-0.50 points)

Analysis of lib/src/archive.dart reported 1 hint:

line 8 col 9: The value of the field '_stagingTestDir' isn't used.

Format lib/src/fastlane.dart.

Run dartfmt to format lib/src/fastlane.dart.

Format lib/src/image_processor.dart.

Run dartfmt to format lib/src/image_processor.dart.

Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.2.2 <3.0.0
archive ^2.0.9 2.0.10
args ^1.5.1 1.5.2
file ^5.0.7 5.0.8+1
meta ^1.1.6 1.1.7
path ^1.6.2 1.6.2
platform ^2.2.0 2.2.0
process ^3.0.9 3.0.9
resource ^2.1.5 2.1.6
yaml ^2.1.15 2.1.16
Transitive dependencies
charcode 1.1.2
collection 1.14.11
convert 2.1.1
crypto 2.0.6
intl 0.15.8
source_span 1.5.5
string_scanner 1.0.4
term_glyph 1.1.0
typed_data 1.1.6
Dev dependencies
mockito ^4.1.0
pedantic ^1.8.0+1
test ^1.5.1+1
test_api ^0.2.5

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