Add test for autoFillMode view attribute

Test: Ran the ViewAttributesTest
Bug: 34077687
Change-Id: Id01286d643ef77d4310206c6516a1bcbc59f2940
diff --git a/tests/autofillservice/Android.mk b/tests/autofillservice/Android.mk
index 5ccc277..e4b80d8 100644
--- a/tests/autofillservice/Android.mk
+++ b/tests/autofillservice/Android.mk
@@ -24,7 +24,8 @@
     ctstestrunner \
     guava \
     truth-prebuilt \
-    ub-uiautomator
+    ub-uiautomator \
+    testng
 
 LOCAL_SRC_FILES := $(call all-java-files-under, src)