Distributing instrumentation tests to all your Androids


Android's ever-expanding ecosystem of devices creates a unique challenge to testing applications. Spoon aims to simplify this task by distributing instrumentation test execution and displaying the results in a meaningful way.

Instead of attempting to be a new form of testing, Spoon makes existing instrumentation tests more useful. Using the application APK and instrumentation APK, Spoon runs the tests on multiple devices simultaneously. Once all tests have completed, a static HTML summary is generated with detailed information about each device and test.

Example output

With the high-level output you can immediately see whether or not a test failure is specific to a single device or all devices. This view is designed to be displayed on a dedicated monitor or TV.

Spoon will run on all targets which are visible to adb devices. Plug in multiple different phones and tablets, start different configurations of emulators, or use some combination of both!

The greater diversity of the targets in use, the more useful the output will be in visualizing your applications.

Device View

The device view outlines the results of each test one a single device. This is useful for tracking down device-specific failures of individual tests.

Example device view

Test View

The test view shows the results of a single test across all of the devices it was executed on.

Example test view


In addition to simply running instrumentation tests, Spoon has the ability to snap screenshots at key points during your tests which are then included in the output. This allows for visual inspection of test executions across different devices.

Taking screenshots requires that you include the spoon-client JAR in your instrumentation app. In your tests call the screenshot method with a human-readable tag.

Spoon.screenshot(activity, "initial_state");
/* Normal test code... */
Spoon.screenshot(activity, "after_login");

The tag specified will be used to identify and compare screenshots taken across multiple test runs.

Screenshots are displayed in order in both the device view and the test view:

Sample output with screenshots

You can also view each test's screenshots as an animated GIF to gauge the actual sequence of interaction.


Latest Runner JAR Latest Client JAR

The source code to the runner, client library, and sample applications as well as this website is available on GitHub.


If you are using Maven for compilation you can declare the screenshot library as a dependency.

  <version>(insert latest version)</version>


Included with Spoon is a sample application and instrumentation tests to demonstrate both the usage as well as provide an example of the output.

The sample shows a simple login screen and an ordering wizard run on a few devices. The application and tests have been constructed so that some have broken styles or will fail on various devices. This was done to give a better idea of what the real-world output looks like.

View sample execution output »


Spoon was designed to be run both as a standalone tool or directly as part of your build system.

Command Line

You can run Spoon as a standalone tool with your application and instrumentation APKs.

java -jar spoon-runner-(insert latest version)-jar-with-dependencies.jar \
    --apk example-app.apk \
    --test-apk example-tests.apk

By default the output will be placed in a spoon-output/ folder of the current directory. You can control additional parameters of the execution using other flags.

    --apk               Application APK
    --fail-on-failure   Non-zero exit code on failure
    --output            Output path
    --sdk               Path to Android SDK
    --test-apk          Test application APK
    --title             Execution title
    --class-name        Test class name to run (fully-qualified)
    --method-name       Test method name to run (must also use --class-name)
    --no-animations     Disable animated gif generation
    --size              Only run test methods annotated by testSize (small, medium, large)
    --adb-timeout       Set maximum execution time per test in seconds (10min default)


If you are using Maven for compilation, a plugin is provided for easy execution. Declare the plugin in the pom.xml for the instrumentation test module.

  <version>(insert latest version)</version>

The plugin will look for an apk dependency for the corresponding application. Typically this is specified in parallel with the jar dependency on the application.


You can invoke the plugin by running mvn spoon:run. The execution result will be placed in the target/spoon-output/ folder. If you want to specify a test class to run, add -Dspoon.test.class=fully.qualified.ClassName. If you only want to run a single test in that class, add -Dspoon.test.method=testAllTheThings.

For a working example see the sample application and instrumentation tests in the spoon-sample/ folder.


If you would like to contribute code you can do so through GitHub by forking the repository and sending a pull request.

When submitting code, please make every effort to follow existing conventions and style in order to keep the code as readable as possible. Please also make sure your code compiles by running mvn clean verify.

Before your code can be accepted into the project you must also sign the Individual Contributor License Agreement (CLA).


Copyright 2013 Square, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
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