Additional tests for enum iteration.

Bug: 68715899
Test: hidl_test
Change-Id: I78ca51568a5380839782ead5698f4d0ac0a3a7dd

tests/foo/1.0/types.hal

@@ -38,3 +38,30 @@ struct Outer {
 struct Unrelated {
     Outer.Inner great;
 };
+
+// structs to test enum iterators in hidl_test
+struct EnumIterators {
+    enum Empty : uint32_t {};
+
+    enum Parent : uint32_t {
+        A,
+    };
+    enum EmptyChild : Parent {};
+    enum Grandchild : EmptyChild {
+        B,
+    };
+
+    enum SkipsValues : uint32_t {
+        A = 7,
+        B,
+        C = 100,
+        D,
+        E
+    };
+    enum MultipleValues : uint32_t {
+        A = 7,
+        B = 7,
+        C = 8,
+        D = 7,
+    };
+};