[2857] Assert type of parameter

diff --git a/src/bin/memmgr/memmgr.py.in b/src/bin/memmgr/memmgr.py.in
index 9141d6b88b394acea2327a4ac83f2b7bc9b18a5c..889ce03abaf2d4731af8ff8dd7bfc20409f1c3f6 100755 (executable)
--- a/src/bin/memmgr/memmgr.py.in
+++ b/src/bin/memmgr/memmgr.py.in
@@ -128,6 +128,7 @@ class Memmgr(BIND10Server):
         """
         Send a command to the builder, with proper synchronization.
         """
+        assert isinstance(cmd, tuple)
         with self._builder_cv:
             self._builder_command_queue.append(cmd)
             self._builder_cv.notify_all()