diff --git a/tests/foo/1.0/IFoo.hal b/tests/foo/1.0/IFoo.hal
index 42e9c170ad..8491cb0f50 100644
--- a/tests/foo/1.0/IFoo.hal
+++ b/tests/foo/1.0/IFoo.hal
@@ -38,7 +38,7 @@ interface IFoo {
     doSomethingElse(int32_t[15] param) generates (int32_t[32] something);
     doStuffAndReturnAString() generates (string something);
     mapThisVector(vec<int32_t> param) generates (vec<int32_t> something);
-    callMe(IFooCallback cb);
+    oneway callMe(IFooCallback cb);
     useAnEnum(SomeEnum zzz) generates (SomeEnum sleepy);
 
     haveAGooberVec(vec<Goober> param);
diff --git a/tests/foo/1.0/IFooCallback.hal b/tests/foo/1.0/IFooCallback.hal
index 2bc6c104b4..0e34266c04 100644
--- a/tests/foo/1.0/IFooCallback.hal
+++ b/tests/foo/1.0/IFooCallback.hal
@@ -1,5 +1,10 @@
 package android.hardware.tests.foo@1.0;
 
+//import IFoo;
+
 interface IFooCallback {
-    heyItsMe(IFooCallback cb);
+    //heyItsMe(IFoo cb);
+    heyItsYou(IFooCallback cb);
+    heyItsYouIsntIt(IFooCallback cb) generates (uint8_t yesOrNo);
+    oneway heyItsTheMeaningOfLife(uint8_t tmol);
 };