diff --git a/test/ThriftTest.thrift b/test/ThriftTest.thrift
index 2be53fa..be000b6 100644
--- a/test/ThriftTest.thrift
+++ b/test/ThriftTest.thrift
@@ -35,6 +35,12 @@
 namespace php ThriftTest
 namespace delphi Thrift.Test
 namespace cocoa ThriftTest
+
+// Presence of namespaces and sub-namespaces for which there is
+// no generator should compile with warnings only
+namespace noexist ThriftTest
+namespace cpp.noexist ThriftTest
+
 namespace * thrift.test
 
 /**
@@ -368,4 +374,4 @@
 struct StructB {
   1: optional StructA aa;
   2: required StructA ab;
-}
\ No newline at end of file
+}