[PATCH 07 of 10] obsolescence: add test for the "branch replacement" logic during push, case B8

[Pierre-Yves David]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at ens-lyon.org>
# Date 1492217637 -7200
#      Sat Apr 15 02:53:57 2017 +0200
# Node ID 5943a09f9c1e4474b90dfd8a97f93c4003a5b94b
# Parent  6c94dcd038b845e72657ec7e01749562812bdaae
# EXP-Topic push.checkheads
# Available At https://www.mercurial-scm.org/repo/users/marmoute/mercurial/
#              hg pull https://www.mercurial-scm.org/repo/users/marmoute/mercurial/ -r 5943a09f9c1e
obsolescence: add test for the "branch replacement" logic during push, case B8

Mercurial checks for the introduction of new heads on push. Evolution comes
into play to detect if existing branches on the server are being replaced by
some of the new one we push.

This changeset adds test for the improved "branch replacement" logic introduce
in an earlier commits. This tests initially lived in the evolve extensions.
Since we now have the code handling this logic in core, it make sense to have
the tests in core too.

See inline documentation for details about the test case added in this
changeset.

diff --git a/tests/test-push-checkheads-pruned-B8.t b/tests/test-push-checkheads-pruned-B8.t
new file mode 100644
--- /dev/null
+++ b/tests/test-push-checkheads-pruned-B8.t
@@ -0,0 +1,98 @@
+====================================
+Testing head checking code: Case B-2
+====================================
+
+Mercurial checks for the introduction of new heads on push. Evolution comes
+into play to detect if existing branches on the server are being replaced by
+some of the new one we push.
+
+This case is part of a series of tests checking this behavior.
+
+Category B: simple case involving pruned changesets
+TestCase 2: multi-changeset branch, head is pruned, rest is superceeded, through other
+
+.. old-state:
+..
+.. * 2 changeset branch
+..
+.. new-state:
+..
+.. * old head is rewritten then pruned
+.. * 1 new branch succeeding to the other changeset in the old branch (through another obsolete branch)
+..
+.. expected-result:
+..
+.. * push allowed
+..
+.. graph-summary:
+..
+..   B ø⇠⊗ B'
+..     | | A'
+..   A ø⇠ø⇠◔ A''
+..     |/ /
+..     | /
+..     |/
+..     ●
+
+  $ . $TESTDIR/testlib/push-checkheads-util.sh
+
+Test setup
+----------
+
+  $ mkdir B8
+  $ cd B8
+  $ setuprepos
+  creating basic server and client repo
+  updating to branch default
+  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ cd server
+  $ mkcommit B0
+  $ cd ../client
+  $ hg pull
+  pulling from $TESTTMP/B8/server (glob)
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  (run 'hg update' to get a working copy)
+  $ hg up 0
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ mkcommit A1
+  created new head
+  $ mkcommit B1
+  $ hg up 0
+  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
+  $ mkcommit A2
+  created new head
+  $ hg debugobsolete `getid "desc(A0)" ` `getid "desc(A1)"`
+  $ hg debugobsolete `getid "desc(B0)" ` `getid "desc(B1)"`
+  $ hg debugobsolete --record-parents `getid "desc(B1)"`
+  $ hg debugobsolete `getid "desc(A1)" ` `getid "desc(A2)"`
+  $ hg log -G --hidden
+  @  c1f8d089020f (draft): A2
+  |
+  | x  262c8c798096 (draft): B1
+  | |
+  | x  f6082bc4ffef (draft): A1
+  |/
+  | x  d73caddc5533 (draft): B0
+  | |
+  | x  8aaa48160adc (draft): A0
+  |/
+  o  1e4be0697311 (public): root
+  
+
+Actual testing
+--------------
+
+  $ hg push
+  pushing to $TESTTMP/B8/server (glob)
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files (+1 heads)
+  4 new obsolescence markers
+
+  $ cd ../..