diff -r 3bb7a080da4d -r 3f5db977d46f tests/test-evolve.t
--- a/tests/test-evolve.t	Thu Jun 04 13:35:12 2015 -0700
+++ b/tests/test-evolve.t	Tue Jun 02 15:23:50 2015 -0700
@@ -22,10 +22,25 @@
   >    hg ci -m "add $1"
   > }
 
+  $ mkstack() {
+  >    # Creates a stack of commit based on $1 with messages from $2, $3 ..
+  >    hg update $1 -C
+  >    shift
+  >    mkcommits $*
+  > }
+
   $ glog() {
   >   hg glog --template '{rev}:{node|short}@{branch}({phase}) {desc|firstline}\n' "$@"
   > }
 
+  $ shaof() {
+  >   hg log -T {node} -r "first(desc($1))"
+  > }
+
+  $ mkcommits() {
+  >   for i in $@; do mkcommit $i ; done
+  > }
+
 various init
 
   $ hg init local
@@ -1078,3 +1093,65 @@
   atop:[26] add j2
   working directory is now at 928e4c317356
 
+Cleanup to make the tree cleaner
+
+  $ hg prune 20
+  1 changesets pruned
+  $ hg prune 26::
+  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
+  working directory now at 4c0bc042ef3b
+  2 changesets pruned
+
+evolve --rev reorders the rev to solve instability. Harder case, obsolescence
+accross three stacks in growing rev numbers. 
+  $ hg up -C 25
+  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ mkstack 25 s1_ s2_ s3_ >/dev/null
+  $ mkstack 25 s1prime s2prime >/dev/null
+  $ mkstack 25 s1second >/dev/null
+  $ hg prune `shaof s1_` -s `shaof s1prime`
+  1 changesets pruned
+  2 new unstable changesets
+  $ hg prune `shaof s1prime` -s `shaof s1second`
+  1 changesets pruned
+  1 new unstable changesets
+  $ hg prune `shaof s2_` -s `shaof s2prime`
+  1 changesets pruned
+
+  $ glog -r "25::"
+  @  33:17b5b6ab3f43@default(draft) add s1second
+  |
+  | o  32:d694d85de729@default(draft) add s2prime
+  | |
+  | x  31:1ae988394dc5@default(draft) add s1prime
+  |/
+  | o  30:819245647e79@default(draft) add s3_
+  | |
+  | x  29:07a5fc5c1502@default(draft) add s2_
+  | |
+  | x  28:5ccaf4765b80@default(draft) add s1_
+  |/
+  o  25:4c0bc042ef3b@default(draft) add j1
+  |
+
+  $ hg evolve --rev "25::"
+  move:[32] add s2prime
+  atop:[33] add s1second
+  move:[30] add s3_
+  atop:[34] add s2prime
+  working directory is now at dc79646e43b4
+  $ glog -r "25::"
+  @  35:dc79646e43b4@default(draft) add s3_
+  |
+  o  34:96f3ff6b7106@default(draft) add s2prime
+  |
+  o  33:17b5b6ab3f43@default(draft) add s1second
+  |
+  o  25:4c0bc042ef3b@default(draft) add j1
+  |
+
+  $ hg prune 33::
+  0 files updated, 0 files merged, 3 files removed, 0 files unresolved
+  working directory now at 4c0bc042ef3b
+  3 changesets pruned
+