[PATCH 1 of 2] tests: add missing 'test-push-checkheads-partial-C1.t'

[Pierre-Yves David]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at octobus.net>
# Date 1495154670 -7200
#      Fri May 19 02:44:30 2017 +0200
# Node ID 6859efcbf87d071d2c8afab08936bb3995031dcb
# Parent  8a87bfc5bebbbe0ac996ac8e047a029eb931af45
# EXP-Topic checkhead-test
# Available At https://www.mercurial-scm.org/repo/users/marmoute/mercurial/
#              hg pull https://www.mercurial-scm.org/repo/users/marmoute/mercurial/ -r 6859efcbf87d
tests: add missing 'test-push-checkheads-partial-C1.t'

For some reason, this one test case did not made it with the others as they got
upstreamed during the 4.2 cycle.

diff --git a/tests/test-push-checkheads-partial-C1.t b/tests/test-push-checkheads-partial-C1.t
new file mode 100644
--- /dev/null
+++ b/tests/test-push-checkheads-partial-C1.t
@@ -0,0 +1,82 @@
+====================================
+Testing head checking code: Case C-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 C: checking case were the branch is only partially obsoleted.
+TestCase 1: 2 changeset branch, only the head is rewritten
+
+.. old-state:
+..
+.. * 2 changeset branch
+..
+.. new-state:
+..
+.. * 1 new changesets branches superceeding only the head of the old one
+.. * base of the old branch is still alive
+..
+.. expected-result:
+..
+.. * push denied
+..
+.. graph-summary:
+..
+..   B ø⇠◔ B'
+..     | |
+..   A â—‹ |
+..     |/
+..     â—‹
+
+  $ . $TESTDIR/testlib/push-checkheads-util.sh
+
+Test setup
+----------
+
+  $ mkdir C1
+  $ cd C1
+  $ 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/C1/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 B1
+  created new head
+  $ hg debugobsolete `getid "desc(B0)" ` `getid "desc(B1)"`
+  $ hg log -G --hidden
+  @  25c56d33e4c4 (draft): B1
+  |
+  | x  d73caddc5533 (draft): B0
+  | |
+  | o  8aaa48160adc (draft): A0
+  |/
+  o  1e4be0697311 (public): root
+  
+
+Actual testing
+--------------
+
+  $ hg push
+  pushing to $TESTTMP/C1/server (glob)
+  searching for changes
+  abort: push creates new remote head 25c56d33e4c4!
+  (merge or see 'hg help push' for details about pushing new heads)
+  [255]
+
+  $ cd ../..