servo: add ControlUnavailableError, has_control()

This change adds its own error class for servo erros where the control is
unavailable on the servod side. This simplifies some of the code as the autotest
code occasionally requires bridges to ensure compatibility with older and newer
servod versions.

As the new error class inherits from TestFail, existing code should still work.

Additionally, it adds a has_control() function to servo.py

This now allows for two flows:
- if the control is likely available, and just some lab compatibility
issues i.e. slow updating of labstations are to be guarded against,
try/except is probably the way to go
- if the test should handle things differently whether a control is
available or not, has_control() is likely the way to go.

BUG=chromium:924434
TEST=test_that --autotest_dir . $DUP_IP power_ServoChargeStress.3loop

// This test uses servo (thus goes through initiation flow) and uses a few
// controls. To verify set/get still work as expected.

Change-Id: I75738fad629faa5c93318d30246c894dcf900227
Signed-off-by: Ruben Rodriguez Buchillon <coconutruben@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1749608
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@google.com>
Reviewed-by: Mary Ruthven <mruthven@chromium.org>
1 file changed
tree: f1a71e1f0010c39607fe1e3e6f459e38ce3d4b57
  1. apache/
  2. bin/
  3. cli/
  4. client/
  5. contrib/
  6. database/
  7. docs/
  8. frontend/
  9. leases/
  10. logs/
  11. results/
  12. scheduler/
  13. server/
  14. site_utils/
  15. test_suites/
  16. tko/
  17. utils/
  18. venv/
  19. .gitignore
  20. .quickmerge_sentinel
  21. .style.yapf
  22. __init__.py
  23. COMMIT-QUEUE-moblab-pre-cq-only.ini
  24. COMMIT-QUEUE.ini
  25. common.py
  26. ENGPROD_OWNERS
  27. FIRMWARE_OWNERS
  28. global_config.ini
  29. INFRA_OWNERS
  30. LGPL_LICENSE
  31. LICENSE
  32. metadata.chromium
  33. moblab_config.ini
  34. PRESUBMIT.cfg
  35. README.md
  36. ssp_deploy_config.json
README.md

Autotest: Automated integration testing for Android and Chrome OS Devices

Autotest is a framework for fully automated testing. It was originally designed to test the Linux kernel, and expanded by the Chrome OS team to validate complete system images of Chrome OS and Android.

Autotest is composed of a number of modules that will help you to do stand alone tests or setup a fully automated test grid, depending on what you are up to. A non extensive list of functionality is:

  • A body of code to run tests on the device under test. In this setup, test logic executes on the machine being tested, and results are written to files for later collection from a development machine or lab infrastructure.

  • A body of code to run tests against a remote device under test. In this setup, test logic executes on a development machine or piece of lab infrastructure, and the device under test is controlled remotely via SSH/adb/some combination of the above.

  • Developer tools to execute one or more tests. test_that for Chrome OS and test_droid for Android allow developers to run tests against a device connected to their development machine on their desk. These tools are written so that the same test logic that runs in the lab will run at their desk, reducing the number of configurations under which tests are run.

  • Lab infrastructure to automate the running of tests. This infrastructure is capable of managing and running tests against thousands of devices in various lab environments. This includes code for both synchronous and asynchronous scheduling of tests. Tests are run against this hardware daily to validate every build of Chrome OS.

  • Infrastructure to set up miniature replicas of a full lab. A full lab does entail a certain amount of administrative work which isn't appropriate for a work group interested in automated tests against a small set of devices. Since this scale is common during device bringup, a special setup, called Moblab, allows a natural progressing from desk -> mini lab -> full lab.

Run some autotests

See the guides to test_that and test_droid:

test_droid Basic Usage

test_that Basic Usage

Write some autotests

See the best practices guide, existing tests, and comments in the code.

Autotest Best Practices

Grabbing the latest source

git clone https://chromium.googlesource.com/chromiumos/third_party/autotest

Hacking and submitting patches

See the coding style guide for guidance on submitting patches.

Coding Style

Pre-upload hook dependencies

You need to run utils/build_externals.py to set up the dependencies for pre-upload hook tests.

Setting up Lucifer

Setting up Lucifer