# test\_droid: Quick Primer

## References

[Autotest Best Practices](best-practices.md)

[test\_that Basic Usage](test-that.md)

## Objective
This document contains instructions for Brillo/Android developers interested in
running automated integration tests at their desk.

## Usage
The autotest repository, the `test_droid` tool, and all tests are checked out
in both AOSP and internal Android trees at external/autotest.  You need a copy
of the autotest source code and an `adb` binary in your PATH to run tests.

### Running tests against a single local device under test
Once you have a local copy of the autotest source, you can easily run tests
against a DUT connected directly to your workstation via a USB cable. Please
note your first time running `test_droid` it will download and install a number
of required packages locally into your autotest checkout.

Run site\_utils/test\_droid.py from your autotest checkout to launch a test
against a given DUT:

```
 $ ./site_utils/test_droid.py 
```

For example, to run the brillo\_WhitelistedGtests test:

```
 $ ./site_utils/test_droid.py brillo_WhitelistedGtests
```

`test_droid` can run multiple tests at once:

```
 $ ./site_utils/test_droid.py brillo_WhitelistedGtests brillo_KernelVersionTest
```

As well as test suites:

```
 $ ./site_utils/test_droid.py suite:brillo-bvt
```

#### Selecting a specific device
If you have more than one device connected, you'll have to specify its serial
number.  First, look it up:

```
 $ adb devices
* daemon started successfully *
List of devices attached
7d52318 device
```

Then use it when running:

```
 $ ./site_utils/test_droid.py -s 7d52318 brillo_WhitelistedGtests
```

### Running tests that require multiple devices under test
Autotest now supports the concept of testbeds, which are multiple devices being
controlled by a single test. `test_droid` supports running these tests
by specifying a comma separated list of serials as the test device:

```
 $ adb devices
List of devices attached
emulator-5554 device
7d52318 device

 $ ./site_utils/test_droid.py -s emulator-5554,7d52318 testbed_DummyTest
```

### Running tests against a remote device under test
`test_droid` can run tests against devices connected to a remote server.  This
requires passwordless SSH access from the workstation to the remote server.
If no username is specified, `test_droid` will try the root and adb users.
If using the adb user, make sure it has passwordless sudo
rights to run the adb and fastboot commands. You can specify a
different user in the remote host name (the same passwordless requirement
applies).

The easiest way to set this up is to use the
[Chrome OS testing keys](https://www.chromium.org/chromium-os/testing/autotest-developer-faq/ssh-test-keys-setup).
Add to your SSH config an entry that looks like the following:

```
HostName 
  Port 9222
  User root
  CheckHostIP no
  StrictHostKeyChecking no
  IdentityFile ~/.ssh/testing_rsa
  Protocol 2
```

To run the test:

```
 $ ./site_utils/test_droid.py \
       -r  \
       

 $ ./site_utils/test_droid.py \
       -r @ \
       

 $ ./site_utils/test_droid.py -r 100.96.48.119 suite:brillo-bvt
```

### Advanced: Uploading Commits for Review
Currently Autotest in AOSP is read-only, so you cannot use repo upload to
upload code changes. If you do edit or add a new test, make a commit and upload
it to https://chromium-review.googlesource.com.

Due to the way Android does its automerging, the AOSP mirror of Autotest cannot
be uploaded directly back to the Chromium upstream because the upstream does not
contain the merge commits.  It will also reject the automerge committer ID.
To work around this, if you need to upload a commit to Autotest, you first have
to fetch and check out the upstream branch before making your changes:

```
 $ git remote add -t master cros \
     https://chromium.googlesource.com/chromiumos/third_party/autotest
 $ git fetch cros
 $ git checkout cros/master
 $ git checkout -b 
 $ git branch --set-upstream-to=cros/master
```

Be sure to run pylint on every file you touch:

```
 $ ./utils/run_pylint.py 
```

Run autotest unittests (which usually requires external packages):

```
 $ utils/build_externals.py  # install any missing os packages with apt-get
 $ utils/unittest_suite.py
```

Then upload your commit for review:

```
 $ git push cros :refs/for/master
```

## Limitations

Testing on Brillo/Android (and `test_droid` by extension) is currently limited
to server-side tests, which run on an autotest server and control a
Brillo/Android DUT (device under test) via remote command execution.  In the
context of `test_droid`, the test logic is running on your development machine,
and controlling devices with commands executed via `adb`.

`test_droid` does not support the autoupdate end-to-end test. For instructions
on how to run this test please refer to the Running Brillo/Android Autoupdate
End-to-End Test doc.