# HG changeset patch
# User Sushil khanchi <sushilkhanchi97@gmail.com>
# Date 1550140783 -19800
# Node ID fc4b7a46fda1ffada5ff3deb8871b3dd94029182
# Parent  cbdd2b56d4c38b0ed1c72e891555aa7e4047c920
copies: add test that makes both the merging csets dirty and fails

This patch is a part of series which is about the case when both the merging
csets are not descendant of merge base. The existing code assumes if c1 is
dirty there shouldn't be any partial copies from c2 i.e both2['incomplete']
and same for c2, if c2 is dirty both1['incomplete'] should be empty,
but this is not the right assumption.
Now as we know we can have both c1 and c2 dirty at the same time, it
is possible that c1 is dirty and both2['incomplete'] has some value.
Or if c2 is dirty and both1['incomplete'] has some value.

Added test shows that because of this assumption it could fail.

Differential Revision: https://phab.mercurial-scm.org/D5962

diff -r cbdd2b56d4c3 -r fc4b7a46fda1 tests/test-copies.t
--- a/tests/test-copies.t	Thu Feb 14 17:11:35 2019 +0530
+++ b/tests/test-copies.t	Thu Feb 14 16:09:43 2019 +0530
@@ -1,6 +1,8 @@
 #testcases filelog compatibility
 
   $ cat >> $HGRCPATH << EOF
+  > [extensions]
+  > rebase=
   > [alias]
   > l = log -G -T '{rev} {desc}\n{files}\n'
   > EOF
@@ -552,3 +554,80 @@
       b
      +baba
   
+Test which demonstrate that fullcopytracing algorithm can fail to handle a case when both the csets are dirty
+----------------------------------------------------------------------------------------------------------
+
+  $ newrepo
+  $ echo a > a
+  $ hg add a
+  $ hg ci -m "added a"
+  $ echo b > b
+  $ hg add b
+  $ hg ci -m "added b"
+
+  $ echo foobar > willconflict
+  $ hg add willconflict
+  $ hg ci -m "added willconflict"
+  $ echo c > c
+  $ hg add c
+  $ hg ci -m "added c"
+
+  $ hg l
+  @  3 added c
+  |  c
+  o  2 added willconflict
+  |  willconflict
+  o  1 added b
+  |  b
+  o  0 added a
+     a
+
+  $ hg up ".^^"
+  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
+  $ echo d > d
+  $ hg add d
+  $ hg ci -m "added d"
+  created new head
+
+  $ echo barfoo > willconflict
+  $ hg add willconflict
+  $ hg ci --amend -m "added willconflict and d"
+
+  $ hg l
+  @  5 added willconflict and d
+  |  d willconflict
+  | o  3 added c
+  | |  c
+  | o  2 added willconflict
+  |/   willconflict
+  o  1 added b
+  |  b
+  o  0 added a
+     a
+
+  $ hg rebase -r . -d 2 -t :other
+  rebasing 5:5018b1509e94 "added willconflict and d" (tip)
+
+  $ hg up 3 -q
+  $ hg l --hidden
+  o  6 added willconflict and d
+  |  d willconflict
+  | x  5 added willconflict and d
+  | |  d willconflict
+  | | x  4 added d
+  | |/   d
+  +---@  3 added c
+  | |    c
+  o |  2 added willconflict
+  |/   willconflict
+  o  1 added b
+  |  b
+  o  0 added a
+     a
+
+Now if we trigger a merge between cset revision 3 and 6 using base revision 4, in this case
+both the merging csets will be dirty as no one is descendent of base revision:
+
+  $ hg graft -r 6 --base 4 --hidden 2>&1 | grep "AssertionError"
+  AssertionError
+