[PATCH 07 of 10] tests: introduce test for rebasing on named branches with closed heads

[Mads Kiilerich]

# HG changeset patch
# User Mads Kiilerich <madski at unity3d.com>
# Date 1384634789 18000
#      Sat Nov 16 15:46:29 2013 -0500
# Node ID 770c4cb0644a1347264f57b7a74e46fd04d59037
# Parent  f404860eafe23627a4bb17884125985c44ddfcfd
tests: introduce test for rebasing on named branches with closed heads
* * *
rebase: improve algorithm for finding other branch head to rebase to (bc)

This is primarily a bug fix. Before, rebase would fail to rebase a to a closed
tip-most branch head and it would fail to rebase a tip-most branch head to a
lower branch head revision. It would also just silently do "something" when the
branch had multiple other branch heads. That made this history modifying
command more dependent on the topological ordering than necessary.

This patch tweaks the behavior so it always and only will rebase if the branch
has one other branch head, no matter if it is closed or not or higher or lower.
It will show a notice if rebasing on top of a closed branch head. If there is
more than one other branch head it will fail and expect more clear
instructions.

diff --git a/tests/test-rebase-named-branches.t b/tests/test-rebase-named-branches.t
--- a/tests/test-rebase-named-branches.t
+++ b/tests/test-rebase-named-branches.t
@@ -240,3 +240,97 @@ Rebasing descendant onto ancestor across
   @  0: 'A'
   
   $ cd ..
+
+Rebase to other head on branch
+
+Set up a case:
+
+  $ hg init case1
+  $ cd case1
+  $ touch f
+  $ hg ci -qAm0
+  $ hg branch -q b
+  $ echo >> f
+  $ hg ci -qAm 'b1'
+  $ hg up -qr -2
+  $ hg branch -qf b
+  $ hg ci -qm 'b2'
+  $ hg up -qr -3
+  $ hg branch -q c
+  $ hg ci -m 'c1'
+
+  $ hg tglog
+  @  3: 'c1' c
+  |
+  | o  2: 'b2' b
+  |/
+  | o  1: 'b1' b
+  |/
+  o  0: '0'
+  
+  $ hg clone -q . ../case2
+
+rebase 'b2' to another lower branch head
+
+  $ hg up -qr 2
+  $ hg rebase
+  nothing to rebase - 792845bb77ee is both base and destination
+  [1]
+  $ hg tglog
+  o  3: 'c1' c
+  |
+  | @  2: 'b2' b
+  |/
+  | o  1: 'b1' b
+  |/
+  o  0: '0'
+  
+
+rebase 'b1' on top of the tip of the branch ('b2') - ignoring the tip branch ('c1')
+
+  $ cd ../case2
+  $ hg up -qr 1
+  $ hg rebase
+  saved backup bundle to $TESTTMP/case2/.hg/strip-backup/40039acb7ca5-backup.hg (glob)
+  $ hg tglog
+  @  3: 'b1' b
+  |
+  | o  2: 'c1' c
+  | |
+  o |  1: 'b2' b
+  |/
+  o  0: '0'
+  
+
+rebase 'c1' to the branch head 'c2' that is closed
+
+  $ hg branch -qf c
+  $ hg ci -qm 'c2 closed' --close
+  $ hg up -qr 2
+  $ hg tglog
+  o  4: 'c2 closed' c
+  |
+  o  3: 'b1' b
+  |
+  | @  2: 'c1' c
+  | |
+  o |  1: 'b2' b
+  |/
+  o  0: '0'
+  
+  $ hg rebase
+  nothing to rebase - c062e3ecd6c6 is both base and destination
+  [1]
+  $ hg tglog
+  o  4: 'c2 closed' c
+  |
+  o  3: 'b1' b
+  |
+  | @  2: 'c1' c
+  | |
+  o |  1: 'b2' b
+  |/
+  o  0: '0'
+  
+
+  $ cd ..