Compiler can not find AndroidInstrumentationTestCase2 when building Android app test code with Android makefile build system

Question

I have a project with some Android test code in it (with the appropriate elements, <uses-library> and <instrumentation>, added to AndroidManifest.xml). This works fine in Eclipse. However, it fails to build with mm, claiming that it can't find the test-runner classes:

/home/orospakr/code/my-android/packages/apps/MyApp/src/ca/orospakr/myapp/test/functional/MyActivityTest.java:5: cannot find symbol
symbol  : class ActivityInstrumentationTestCase2
location: package android.test
import android.test.ActivityInstrumentationTestCase2;
                   ^