diff --git a/tests/test-manifest.t b/tests/test-manifest.t
index 1e75311d78f7720392dc5d614cb5c2634dc1b331_dGVzdHMvdGVzdC1tYW5pZmVzdC50..99eb9f269a5a390aed2f3aaa7a999e863db76581_dGVzdHMvdGVzdC1tYW5pZmVzdC50 100644
--- a/tests/test-manifest.t
+++ b/tests/test-manifest.t
@@ -116,3 +116,11 @@
   cache contains 1 manifest entries, in order of most to least recent:
   id: 1e01206b1d2f72bd55f2a33fa8ccad74144825b7, size 133 bytes
   total cache data size 157 bytes, on-disk 157 bytes
+
+Check we don't duplicated entry (added from the debug command)
+
+  $ hg debugmanifestfulltextcache --add 1e01206b1d2f72bd55f2a33fa8ccad74144825b7
+  $ hg debugmanifestfulltextcache
+  cache contains 1 manifest entries, in order of most to least recent:
+  id: 1e01206b1d2f72bd55f2a33fa8ccad74144825b7, size 133 bytes
+  total cache data size 157 bytes, on-disk 157 bytes