git-commit-vandalism/t/t6401-merge-criss-cross.sh
Elijah Newren 919df31955 Collect merge-related tests to t64xx
The tests for the merge machinery are spread over several places.
Collect them into t64xx for simplicity.  Some notes:

t60[234]*.sh:
  Merge tests started in t602*, overgrew bisect and remote tracking
  tests in t6030, t6040, and t6041, and nearly overtook replace tests
  in t6050.  This made picking out relevant tests that I wanted to run
  in a tighter loop slightly more annoying for years.

t303*.sh:
  These started out as tests for the 'merge-recursive' toplevel command,
  but did not restrict to that and had lots of overlap with the
  underlying merge machinery.
t7405, t7613:
  submodule-specific merge logic started out in submodule.c but was
  moved to merge-recursive.c in commit 18cfc08866 ("submodule.c: move
  submodule merging to merge-recursive.c", 2018-05-15).  Since these
  tests are about the logic found in the merge machinery, moving these
  tests to be with the merge tests makes sense.

t7607, t7609:
  Having tests spread all over the place makes it more likely that
  additional tests related to a certain piece of logic grow in all those
  other places.  Much like t303*.sh, these two tests were about the
  underlying merge machinery rather than outer levels.

Tests that were NOT moved:

t76[01]*.sh:
  Other than the four tests mentioned above, the remaining tests in
  t76[01]*.sh are related to non-recursive merge strategies, parameter
  parsing, and other stuff associated with the highlevel builtin/merge.c
  rather than the recursive merge machinery.

t3[45]*.sh:
  The rebase testcases in t34*.sh also test the merge logic pretty
  heavily; sometimes changes I make only trigger failures in the rebase
  tests.  The rebase tests are already nicely coupled together, though,
  and I didn't want to mess that up.  Similar comments apply for the
  cherry-pick tests in t35*.sh.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-08-10 15:59:00 -07:00

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#!/bin/sh
#
# Copyright (c) 2005 Fredrik Kuivinen
#
# See https://lore.kernel.org/git/Pine.LNX.4.44.0504271254120.4678-100000@wax.eds.org/ for a
# nice description of what this is about.
test_description='Test criss-cross merge'
. ./test-lib.sh
test_expect_success 'prepare repository' '
test_write_lines 1 2 3 4 5 6 7 8 9 >file &&
git add file &&
git commit -m "Initial commit" file &&
git branch A &&
git branch B &&
git checkout A &&
test_write_lines 1 2 3 4 5 6 7 "8 changed in B8, branch A" 9 >file &&
git commit -m "B8" file &&
git checkout B &&
test_write_lines 1 2 "3 changed in C3, branch B" 4 5 6 7 8 9 >file &&
git commit -m "C3" file &&
git branch C3 &&
git merge -m "pre E3 merge" A &&
test_write_lines 1 2 "3 changed in E3, branch B. New file size" 4 5 6 7 "8 changed in B8, branch A" 9 >file &&
git commit -m "E3" file &&
git checkout A &&
git merge -m "pre D8 merge" C3 &&
test_write_lines 1 2 "3 changed in C3, branch B" 4 5 6 7 "8 changed in D8, branch A. New file size 2" 9 >file &&
git commit -m D8 file
'
test_expect_success 'Criss-cross merge' '
git merge -m "final merge" B
'
test_expect_success 'Criss-cross merge result' '
cat <<-\EOF >file-expect &&
1
2
3 changed in E3, branch B. New file size
4
5
6
7
8 changed in D8, branch A. New file size 2
9
EOF
test_cmp file-expect file
'
test_expect_success 'Criss-cross merge fails (-s resolve)' '
git reset --hard A^ &&
test_must_fail git merge -s resolve -m "final merge" B
'
test_done