Test update to branch tip

tests/test-newbranch

@@ -63,3 +63,11 b' 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

tests/test-newbranch.out

@@ -94,3 +94,6 b' 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