Here's a first draft of a bot script for running the DDC tests.

tools/bots/ddc_tests.py

Index: tools/bots/ddc_tests.py
diff --git a/tools/bots/ddc_tests.py b/tools/bots/ddc_tests.py
index 73f8f4a6f852198a12863069022b01bd472c6f5a..6799a5bd6806c299d4a4faf6899af42735d27f5f 100644
--- a/tools/bots/ddc_tests.py
+++ b/tools/bots/ddc_tests.py
@@ -21,6 +21,12 @@ BUILD_OS = utils.GuessOS()
 CHANNEL = bot_utils.GetChannelFromName(bot_name)
 
 if __name__ == '__main__':
-  print "This step should run dartdevc tests"
-  print "Current directory when running on a bot should be"
-  print "/b/build/slave/[builder name]/build/sdk"
+  with utils.ChangedWorkingDirectory('pkg/dev_compiler'):
+    with bot.BuildStep('npm install'):
+      bot.RunProcess(['npm', 'install'])
+
+    with bot.BuildStep('Compile tests and run unit tests'):
+      bot.RunProcess(['dart', 'test/all_tests.dart'])

[Bill Hesse, 2016/11/10 18:25:45]

You need to say which dart executable you want to use.  There is a helper
function to get the checked in dart executable from the SDK repo.

utils.CheckedInSdkExecutable()

The utils object is created by import bot_utils.

+
+    with bot.BuildStep('Execute compiled tests'):
+      bot.RunProcess(['npm', 'test'])