Change build path to "packages/app/Camera.apk". So that it will also

build the application code.

testrunner/test_defs.xml

@@ -192,13 +192,13 @@ Native tests:
     continuous="true" />
 
 <test name="camerastress"
-    build_path="packages/apps/Camera/tests"
+    build_path="packages/apps/Camera"
     package="com.android.camera.tests"
     class="com.android.camera.StressTests"
     coverage_target="Camera" />
 
 <test name="camera"
-    build_path="packages/apps/Camera/tests"
+    build_path="packages/apps/Camera"
     package="com.android.camera.tests"
     class="com.android.camera.UnitTests"
     continuous="true"