diff --git a/tests/test-largefiles-cache.t b/tests/test-largefiles-cache.t
--- a/tests/test-largefiles-cache.t
+++ b/tests/test-largefiles-cache.t
@@ -179,3 +179,25 @@ conditional above.
   $ find src/.hg/largefiles/* | egrep "(dirstate|$hash)" | sort
   src/.hg/largefiles/dirstate
   src/.hg/largefiles/e2fb5f2139d086ded2cb600d5a91a196e76bf020
+
+Inject corruption into the largefiles store and see how update handles that:
+
+  $ cd src
+  $ hg up -qC
+  $ cat large
+  modified
+  $ rm large
+  $ cat .hglf/large
+  e2fb5f2139d086ded2cb600d5a91a196e76bf020
+  $ mv .hg/largefiles/e2fb5f2139d086ded2cb600d5a91a196e76bf020 ..
+  $ echo corruption > .hg/largefiles/e2fb5f2139d086ded2cb600d5a91a196e76bf020
+(the following update will put the corrupted file into the working directory
+where it will show up as a change)
+  $ hg up -C
+  getting changed largefiles
+  1 largefiles updated, 0 removed
+  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ hg st
+  M large
+  ? z
+  $ rm .hg/largefiles/e2fb5f2139d086ded2cb600d5a91a196e76bf020