Added a basic name annotation test

c++/src/capnp/encoding-test.c++

@@ -1651,6 +1651,16 @@ TEST(Encoding, HasEmptyStructList) {
   EXPECT_EQ(2, root.totalSize().wordCount);
 }
 
+TEST(Encoding, NameAnnotation) {
+  MallocMessageBuilder message;
+  auto root = message.initRoot<test::RenamedStruct>();
+
+  root.setGoodFieldName(true);
+  root.setAnotherGoodFieldName(test::RenamedStruct::RenamedEnum::QUX);
+
+  EXPECT_EQ(2, static_cast<uint16_t>(test::RenamedStruct::RenamedEnum::QUX));
+}
+
 }  // namespace
 }  // namespace _ (private)
 }  // namespace capnp

c++/src/capnp/test.capnp

@@ -688,3 +688,18 @@ struct TestProvisionId {}
 struct TestRecipientId {}
 struct TestThirdPartyCapId {}
 struct TestJoinResult {}
+
+struct TestNameAnnotation $Cxx.name("RenamedStruct") {
+  union {
+    badFieldName @0 :Bool $Cxx.name("goodFieldName");
+    bar @1 :Int8;
+  }
+
+  enum BadlyNamedEnum $Cxx.name("RenamedEnum") {
+    foo @0;
+    bar @1;
+    baz @2 $Cxx.name("qux");
+  }
+
+  anotherBadFieldName @2 :BadlyNamedEnum $Cxx.name("anotherGoodFieldName");
+}