[PATCH 4 of 4 V3] strip: add a --keep test related to removing files from dirstate

[cdelahousse at fb.com]

# HG changeset patch
# User Christian Delahousse <cdelahousse at fb.com>
# Date 1448911395 28800
#      Mon Nov 30 11:23:15 2015 -0800
# Node ID 19e4c306faa890d082c3059e249d07f609025f6a
# Parent  ed45ba0f6b36e931b1a0dcbacc9fa7e5c60c2c05
strip: add a --keep test related to removing files from dirstate

When strip builds the list of changedfiles to pass into dirstate.rebuild, it adds
files blindly, including those that have been removed. This tests ensures that
rebuild can handle this case.

diff --git a/tests/test-strip.t b/tests/test-strip.t
--- a/tests/test-strip.t
+++ b/tests/test-strip.t
@@ -552,12 +552,19 @@
   $ echo b > b
   $ echo d > d
   $ hg strip --keep tip
-  saved backup bundle to $TESTTMP/test/.hg/strip-backup/57e364c8a475-4cfed93c-backup.hg (glob)
+  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
   $ hg status
   M b
   ! bar
   ? c
   ? d
+
+... after updating the dirstate
+  $ hg add c
+  $ hg commit -mc
+  $ hg rm c
+  $ hg commit -mc
+  $ hg strip --keep '.^' -q
   $ cd ..
 
 stripping many nodes on a complex graph (issue3299)