--- a/tests/test-newbranch
+++ b/tests/test-newbranch
@@ -63,3 +63,11 @@ except ValueError, inst:
     else:
         print "ValueError: %s" % inst
 EOF
+
+echo % update with no arguments: tipmost revision of the current branch
+hg up -q -C 0
+hg up -q
+hg id
+hg up -q 1
+hg up -q
+hg id

--- a/tests/test-newbranch.out
+++ b/tests/test-newbranch.out
@@ -94,3 +94,6 @@ foo                            4:4909a37
 bar                            2:67ec16bde7f1575d523313b9bca000f6a6f12dca
 % test old hg reading branch cache with feature list
 ValueError raised correctly, good.
+% update with no arguments: tipmost revision of the current branch
+bf1bc2f45e83
+4909a3732169 (foo) tip