I discovered a bit more:
adb install ./repository/testcases/CtsTestStubs.apk
adb install ./repository/testcases/CtsAppTestCases.apk
adb shell am instrument -w
com.android.cts.app/
android.test.InstrumentationCtsTestRunner
This starts the test suite. There are still the problems of selecting
the particular test that I see failing and of
providing the automated input event to the test.