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Test Suites

This document describes how to write, update, run, disable, and enumerate tests that are in a Test Suite.

A test suite is a collection of tests, client and server side, that are run on a particular build to validate a larger system.

Test Suites build on the Autotest control file specification.

How to Create a new Test Suite

In order to create a valid suite the following two requirements need to be met:
  • A Suite control file (e.g. test_suites/control.bvt-inline)
  • At least one test with the 'suite:<your_suite_name>' tag in the ATTRIBUTES line of test control file.

We have a mechanism that allows suites of tests to be defined dynamically by a control file at runtime.  test_suites/control.bvt-inline in the autotest repo is a simple example of such a suite, and login_LoginSuccess is one test that's included in this suite. Looking at the control file for login_LoginSuccess, note the line ATTRIBUTES = "suite:bvt-inline, suite:push_to_prod, suite:smoke".  This is used in control.bvt-inline like this:

args_dict['name'] = 'bvt-inline'

The infrastructure finds login_LoginSuccess by matching the contents of the suite tags in ATTRIBUTES field in its control file against the suite name passed into dynamic_suite.reimage_and_run()

If one test should be in multiple suites,  the ATTRIBUTES field in the control file can be a comma delimited list of suite tags.

ATTRIBUTES = "suite:bvt-inline, suite:push_to_prod, suite:smoke"

For an end-to-end demonstration of the flow of creating a new suite, see Dynamic Suites Code Lab

How to Modify Suites

This section will go over adding, removing, and marking tests as experimental. 

Some suites have restrictions when it comes to adding tests to them. To read about the requirements of a particular test suite refer to its suite control under autotest/files/test_suites/control.suite_name.

For example: control.bvt-inline

How to Add tests to a Suite

Add the 'suite:<your_suite_name>' tag to the ATTRIBUTES field in the control file of the test you want to be run in the suite. If this test is new add it as an experimental test first, see below.

How to Disable Tests in Test Suite?

To disable a test remove the 'suite:<your_suite_name>' tag from the ATTRIBUTES field, if it is the only variable in the ATTRIBUTES field, remove the entire ATTRIBUTES line. 
You may consider marking a test as experimental to avoid closing of the tree but continue running tests.

Add new experimental tests?

Some times you may want to add tests that are experimental to start gathering some data but you do not want the tree to be closed. To do this use the EXPERIMENTAL control file variable. 

AUTHOR = "Autotest Team"
NAME = "Sleeptest"
TEST_CATEGORY = "Functional"
TEST_CLASS = "General"
TEST_TYPE = "client"
ATTRIBUTES = "suite:bvt-inline"
EXPERIMENTAL = "True"viarable

An example of a test marked experimental.

Suite Options

These are options that you can use to tweak the behavior in your suite control file.

Boolean, if the hosts required are not currently in good health fail the suite. You may want to let the suite sit around for a while and wait for the hosts to be repaired. Default: True

If you only want the suite to include non-experimental tests. Default: True

Whether or not bugs should be filed when tests fail (See below for a more detailed example)

Whether or not bugs should be filed when experimental tests fail

How long each job should be allowed to run in a suite. Default is 24 hours. (See below for an example)

If you want to apply a dependency across the whole suite (See below for a more detailed example)

What version_prefix to use. Currently we have two types of version_prefix CROS_VERSION_PREFIX and FW_VERSION_PREFIX, defined in autotest_lib.server.cros.provision
This tells our infrastructure how you would like to provision the allocateviarabled machines.  CROS_VERSION_PREFIX tells the infrastructure to provision the machines to the correct OS version.
FW_VERSION_PREFIX tells the infrastructure to provision the machines to the correct firmware version.

deprecated option: skip_reimage
This option has been deprecated. If you specify a build string when creating the suite, our infrastructure will automatically provision the allocated machines to the requested build.

Add a suite-level dependency?

In addition to DEPENDENCIES specified on a per-test level, a set of suite dependencies can be specified at the suite level. These dependencies will be appended to the dependency list of all tests when they are run through that suite. To add suite-level dependencies, pass in your desired dependencies to dynamic_suite.reimage_and_run with the suite_dependencies argument. For example:

args_dict['suite_dependencies'] = 'carrier:tmobile'

Multiple suite-level dependencies can be given as a comma separated string.

How do I enable automatic bug filing for my suite?

If your suite is already being run via suite_scheduler, you only need to edit the suite control file.
  • Drop an optional _BUG_TEMPLATE dictionary into your suite control file:
    'labels': ['OS-Chrome','Type-Bug', 'your-label'],
    'owner': '',
    'status': None,
    'summary': None,
    'title': None,
    'cc': ['','', '']

args_dict['bug_template'] = _BUG_TEMPLATE

How do I define bug template in test control file?

If you want to sign up (being owner or being cc-ed), or apply certain label to the bug when test failed, you only need to add an optional BUG_TEMPLATE dictionary into your test control file:


   'labels': ['your-label'],

   'owner': '',

   'status': None,

   'summary': None,

   'title': None,

   'cc': ['','', '']


The settings in this bug template will be merged to the bug template defined in suite control file. That is, labels and cc defined in both test and suite control files will be merged and applied to the bug filed.

How do I run jobs in a suite for longer than 24 hours?

In your suite control file pass the max_runtime_mins option:

An example to allow tests to run for 6 hours.

args_dict['max_runtime_mins'] = 60*6

How to enumerate what tests will run for a given Suite?

There is a tool under the autotest repo to enumerate tests that will run in a suite. 

From within the chroot the following command can be executed:

$~/trunk/src/third_party/autotest/files/site_utils/ -a ~/trunk/src/third_party/autotest/files bvt-inline

-a option is to specify what Autotest directory to look in.

The argument bvt-inline is the SUITE you are intersted in. 

How to enumerate what suites are available?

$~/trunk/src/third_party/autotest/files/site_utils/ -a ~/trunk/src/third_party/autotest/files -l 

How to run suites with test_that?

(chroot)$ test_that -b ${board} ${host} suite:bvt-inline

Note that if your suite contains multiple control files that are associated with the same autotest, you may get an error that says something like this:

TestError: <AUTOTEST_NAME> already exists; multiple tests cannot run with the same subdirectory

To fix this, add a "tag" parameter to the job.run_test() in the associated control files (e.g., job.run_test('foo', tag='some_tag')) to distinguish them and make the results get written into uniquely-named result directories.

Suite Scheduler (Running suites out of band)

Suite scheduler is the piece of software that is responsible for kicking off suites out of band based on a set of events as opposed to in a waterfall. If you are interested in running suites in a waterfall refer to the HW_Test section below. Below is a run down on how this works and what needs to happen to add new suites to this configuration.

How are suites handled on branches?

Suites are scheduled based off of build artifacts, the autotest tarball generated at build time is used to enumerate what control files belong to what suites and what version of those particular tests should be run. If updated a test on TOT it will need to be back ported to every branch that needs those updates just like any other change.

How do I schedule my suite using suite_scheduler?

If your suite is a part of bvt, kaen_bvt, or smoke it will automatically run and no further action must be taken. 

An out of band process runs on the Autotest server to schedule suite runs based on a number of events. The code lives under autotest/files/site_utils/suite_scheduler and it's configuration (a Python config file) can be created in autotest/files/suite_scheduler.ini.

For the test lab, the config file is located in chromeos-admin repo as suite_scheduler.ini (sample CL).

To add your suite send a code review with a new entry as outlined below.

Example Config Entry

run_on: weekly
suite: kernel_weekly_regression
day: 0
branch_specs: >=tot-1
pool: suites
boards: first_board,second_board

There are 7 parts to a configuration entry. 
  1. A [unique name] as the toplevel marker for the config [WeeklyKernelRegression]
  2. What events the suite should run_on
  3. What suite the config entry is for.
  4. What branch_specs to apply to the config entry. This supports specific releases like R21, or a string for (==tot, >=tot-1, >=tot-2)
  5. What pool should be used. 
  6. What boards the suite should run on (optional, defaults to all boards).
  7. Which day to schedule the weekly run (0 for Sunday). 

The top level unique name marker is part of the Python config format and must be unique and it should reflect what suite is being configured. 

Supported run_on events

  • nightly - At trigger time the latest image available on the devserver is used to schedule jobs against.
  • new_build - When a new build is marked as PASS in manifest-versions (Happens via the build process) a suite will be kicked off with this build. 
  • weekly - Once a week on sunday the latest image available will be used to schedule jobs against. 
Pending implementation: new_chrome
*If there are other events you would like to have available please file a bug

Options for suite line 

The suite line can only be used to describe one individual suite. The name used pertains to the suite added under autotest/files/test_suites/control.suite_name. The above example would invoke the control.kernel_weekly_regression suite file. 

Valid branch_specs options

There are three different branch specs that can be used to ensure your suite runs on a particular branch:

  • factory - Any factory branch that is producing images will cause this event to fire. 
  • firmware - Any firmware branch that is producing images will cause this event to fire.  
  • >=R21 - Any release branch that is greater than or equal to R21. 
    • The >= is required and is used to avoid trying to run tests on branches that do not have the proper control files. 

What pool should I select?

A pool is a label on a machine like pool:bvt. We are using pools extensively currently as our dependency support is not quite there yet. Unless you are doing something out of the ordinary with extra hardware required to be attached to the DUT you should always use pool: suites which is a general pool for suite runs.

If you are doing things that require extra hardware chances are there is already a precedent for this in the suite_scheduler.ini file and you should reference those. When in doubt ask

How do I specify bug filing options?

Bug filing is optional, and defaults to False. If file_bugs is set to true in the ini section of the suite each test failure will either result in a new bug or a comment on an existing open bug, on the chromium bug tracker. Deduplication of bugs happens based on the test name, the suite name and the reason for failure. You can specify more bug filing options through the bug_template in the suite control file.

Running suites in BuildBot (HW_Test Stage)

Suites can also be run as a step in the buildbot waterfall. This assumes you are running your builds via cbuildbot, if you are not please file a bug with your need and the Lab team can look at how to best direct you.

*Note when running the HW_Test step you are blocking your waterfall on actual hardware tests. If you do not want your builders to block on this consider using Suite Scheduler as described above.
*Note if your build master is not on the master2 vlan you will need to file a bug with the Chrome OS lab team so a proxy connection can be set up.

Adding a HW_Test step to your cbuildbot config is as easy as editing in the chromite repo and adding a hw_test entry like the following:

Example running the bvt suite for a lumpy build:

  paladin_builder_name='lumpy paladin',

You need to specify upload_hw_test_artifacts so that Autotest has access to the image and the build artifacts via Google Storage and specify what suite(s) you want to run via a list called hw_tests.

Format of job names for running suites in Autotest

For suite jobs:

For sub-jobs run from the suite:

If a particular test is set with EXPERIMENTAL = True it is prefaced with experimental_test_name.


*How to force the scheduling of an event suite via

*This is not a typical use case for users. 

Suite scheduler lives under autotest/files/site_utils/suite_scheduler/

An example of forcing all nightly suites for stumpy to be kicked off.

site_utils/suite_scheduler/ -i  stumpy-release/R21-2270.0.0 -e nightly

*How to schedule an individual suite?

If you need to run an individual suite for a particular build but not all of the suites that would be kicked off by a particular event you can use the same command the buildbots use,

site_utils/ -b parrot -p parrot_2gb -s kernel_weekly_regression -i parrot-release/R23-1913.156.1 -u 1

Where can I see results from suite runs?

Other than the BVT suite no other suite results are displayed on the buildbot waterfall. To see your results you need to refer to the Wmatrix dashboard at

From there, select "Suite list" --> select your suite name, e.g. "bvt". You will see a matrix where the column represents boards and the rows represents builds. Each cell shows the test results available for that (build, board).