tests: add test for rebase template showing wrong behavior

The output for template "{nodechanges % '{key}:{value}'}" does not contain the
output for value.

Differential Revision: https://phab.mercurial-scm.org/D1462

tests/test-rebase-templates.t

@@ -1,44 +1,58 b''
 Testing templating for rebase command
 
 Setup
 
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > rebase=
   > [experimental]
   > evolution=createmarkers
   > EOF
 
   $ hg init repo
   $ cd repo
   $ for ch in a b c d; do echo foo > $ch; hg commit -Aqm "Added "$ch; done
 
   $ hg log -G -T "{rev}:{node|short} {desc}"
   @  3:62615734edd5 Added d
   |
   o  2:28ad74487de9 Added c
   |
   o  1:29becc82797a Added b
   |
   o  0:18d04c59bb5d Added a
   
 Getting the JSON output for nodechanges
 
   $ hg rebase -s 2 -d 0 -q -Tjson
   [
    {
     "nodechanges": {"28ad74487de9599d00d81085be739c61fc340652": ["849767420fd5519cf0026232411a943ed03cc9fb"], "62615734edd52f06b6fb9c2beb429e4fe30d57b8": ["df21b32134ba85d86bca590cbe9b8b7cbc346c53"]}
    }
   ]
 
   $ hg log -G -T "{rev}:{node|short} {desc}"
   @  5:df21b32134ba Added d
   |
   o  4:849767420fd5 Added c
   |
   | o  1:29becc82797a Added b
   |/
   o  0:18d04c59bb5d Added a
   
   $ hg rebase -s 1 -d 5 -q -T "{nodechanges|json}"
   {"29becc82797a4bc11ec8880b58eaecd2ab3e7760": ["d9d6773efc831c274eace04bc13e8e6412517139"]} (no-eol)
+
+  $ hg log -G -T "{rev}:{node|short} {desc}"
+  o  6:d9d6773efc83 Added b
+  |
+  @  5:df21b32134ba Added d
+  |
+  o  4:849767420fd5 Added c
+  |
+  o  0:18d04c59bb5d Added a
+  
+
+  $ hg rebase -s 6 -d 4 -q -T "{nodechanges % '{oldnode}:{newnodes % ' {node} '}'}"
+  d9d6773efc831c274eace04bc13e8e6412517139: f48cd65c6dc3d2acb55da54402a5b029546e546f  (no-eol) (false !)
+  d9d6773efc831c274eace04bc13e8e6412517139 (no-eol)