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A utility for running Flutter integration tests on pools of real devices in cloud. Works with AWS Device Farms.

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A sylph is a mythological invisible being of the air. Wikipedia

Sylph #

Sylph is a command line utility for running Flutter integration and end-to-end tests on pools of real iOS and Android devices in the cloud. Sylph runs on mac, linux and windows and also in a CI environment.

Sylph works with AWS Device Farm for up to hundreds of Android and iOS devices in a single run.

Installation #

pub global activate sylph

Usage #


or, if not using the default config file:

sylph -c <path to config file>

General usage:

usage: sylph [--help] [--config <config file>] [--devices <all|android|ios>] [--verbose]

sample usage: sylph

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

-d, --devices=<all|android|ios>    List devices available in cloud.
                                   [all, android, ios]

-v, --verbose                      Noisy logging, including all shell commands executed.
-h, --help                         Display this help information.

Dependencies #


Install AWS Command Line Interface (AWS CLI)


curl "" -o ""
sudo ./awscli-bundle/install -i /usr/local/aws -b /usr/local/bin/aws


pip install  awscli 

For alternative install options see:

AWS CLI Credentials #

Configure the AWS CLI credentials:

$ aws configure
AWS Secret Access Key [None]: wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
Default region name [None]: us-west-2
Default output format [None]: json

For alternative configuration options see:

Test AWS CLI #

Confirm AWS CLI is installed and configured correctly by running an AWS command. For example, the following command should generate output:

aws devicefarm list-projects

Configuration #

Configuration information is passed to Sylph using a configuration file. The default config file is called sylph.yaml:

# Config file for Flutter tests on real device pools.
# Auto-creates projects and device pools if needed.
# Configures android and ios test runs.
# Builds app, uploads and runs tests.
# Then monitors tests, returns final pass/fail result and downloads artifacts.
# Note: assumes the 'aws' command line utility is logged-in.
# Note: to build the debug iOS app, certain environment variables are required.

# sylph config
tmp_dir: /tmp/sylph
artifacts_dir: /tmp/sylph_artifacts
# local timeout per device farm run
sylph_timeout: 720 # seconds approx
# run on ios and android pools concurrently (for faster results)
concurrent_runs: true

# device farm config
project_name: App Integration Tests
default_job_timeout: 10 # minutes, set at project creation


  - pool_name: android pool 1
    pool_type: android
      - name: Google Pixel 2
        model: Google Pixel 2
        os: 8.0.0

  - pool_name: ios pool 1
    pool_type: ios
      - name: Apple iPhone X
        model: A1865
        os: 11.4


  - test_suite: example tests 1
    main: test_driver/main.dart
      - test_driver/main_test.dart
      - android pool 1
      - ios pool 1
    job_timeout: 15 # minutes, set per job, over-rides default job timeout above

Multiple test suites, consisting of multiple tests, can be run on each device in each device pool. The 'main' app must include a call to enableFlutterDriverExtension().

Device pools can consist of multiple devices. Devices in a device pool must be of the same type, iOS or Android.

Note: If running on linux or windows, tests can only be run on Android devices. To run tests on both Android and iOS use a mac CI provider.

Building an iOS debug app #

To build a testable iOS app locally, that can run on any real device in the cloud, the following environment variable must be present:

    This is the Developer Portal Team ID. It is of the form 'ABCDEFGHIJ'.

A check is made before the start of a run to confirm this environment variable is present.

Note: if not running on an iOS pool this environment variable is not required.

Populating a device pool #

To add devices to a device pool, pick devices from the list provided by

sylph -d android
sylph -d ios

and add to the appropriate pool type in sylph.yaml. The listed devices are devices currently available on Device Farm.

Configuration Validation #

The sylph.yaml is validated to confirm the devices are available on Device Farm and tests are present before starting a run.

If running on an iOS pool, the iOS-related environment variables must be defined.

Configuring Flavors #

A reference flavor app can be found in example/flavors. It is taken from and works for android and iOS. It is currently recommended that you follow this pattern when implementing flavors in your app.

To enable testing on a flavor add the following to your sylph.yaml:

flavor: <name of flavor>

Configuring a CI Environment for Sylph #

In addition to running from the command line, Sylph also runs in a CI environment.

AWS CLI Credentials for CI #

The following AWS CLI credentials are required in a CI environment:


For details on other credentials see:

iOS builds #

To build the iOS app, the provisioning profile and certificate must be installed on the CI build machine. To install these dependencies, Fastlane's match is used. Sylph will detect it is running in a CI environment (using the 'CI' environment variable), and will install fastlane and fastlane scripts. The scripts are used to install the dependencies using Fastlane's match. The iOS build can then complete as normal.

The following environment variables are required by a CI build to use Fastlane match:

    This is the location of the private match repo. It expects an ssh-based url. For example, ssh://
    This is the password that was used to encrypt the git repo's contents during match setup.

For details on how to setup Match see:

The following are required by sylph in a CI environment to connect to the match host. The match host is running a ssh server that connects to the git server which serves the match repo. This configuration is required so that PUBLISHING_MATCH_CERTIFICATE_REPO will work via ssh:

    This is used to configure the CI's ssh client to find the match host. For example,
    This is used to configure the CI's ssh client to find the match host's ssh port. For example, 22.

As with running from the command line, the following environment variable is also required by Sylph in a CI environment:

    This is the Developer Portal Team ID. It is of the form 'ABCDEFGHIJ'.

Note: if not running on an iOS pool all iOS-related environment variables are not required.

Sample environment variables for Travis-CI #

For example, when Sylph is run on Travis-CI the following environment variables are used:

secret variables

See .travis.yml for running Sylph on Travis-CI.

Note: the Travis-CI build uses pre-configured AWS CLI values in .aws/config.

Upgrade #

To upgrade, simply re-issue the install command

$ pub global activate sylph

To check the version of Sylph currently installed:

pub global list

Live demo #

To see Sylph in action in a CI environment, a demo of the example app is available.

The log of the live run on mac and linux is here:

The resulting artifacts are here:
(includes a video of test running on device)

To view a similar run on windows:

Contributing #

When contributing to this repository, please feel free to discuss via issue or pull request.

Issues and pull requests are welcome.

Your feedback 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.

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A utility for running Flutter integration tests on pools of real devices in cloud. Works with AWS Device Farms.

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GPL-3.0 (license)


args, collection, duration, isolate, path, process, resource, sprintf, tool_base, version, yaml, yamlicious


Packages that depend on sylph