t/t7600-merge.sh - pub/scm/git/git - Git at Google

 #!/bin/sh
 #
 # Copyright (c) 2007 Lars Hjemli
 #

 test_description='git merge

 Testing basic merge operations/option parsing.

 ! [c0] commit 0
  ! [c1] commit 1
   ! [c2] commit 2
    ! [c3] commit 3
     ! [c4] c4
      ! [c5] c5
       ! [c6] c6
        * [master] Merge commit 'c1'
 --------
        - [master] Merge commit 'c1'
  +     * [c1] commit 1
       +  [c6] c6
      +   [c5] c5
     ++   [c4] c4
    ++++  [c3] commit 3
   +      [c2] commit 2
 +++++++* [c0] commit 0
 '

 . ./test-lib.sh

 test_expect_success 'set up test data and helpers' '
 	printf "%s\n" 1 2 3 4 5 6 7 8 9 >file &&
 	printf "%s\n" "1 X" 2 3 4 5 6 7 8 9 >file.1 &&
 	printf "%s\n" 1 2 3 4 "5 X" 6 7 8 9 >file.5 &&
 	printf "%s\n" 1 2 3 4 5 6 7 8 "9 X" >file.9 &&
 	printf "%s\n" "1 X" 2 3 4 5 6 7 8 9 >result.1 &&
 	printf "%s\n" "1 X" 2 3 4 "5 X" 6 7 8 9 >result.1-5 &&
 	printf "%s\n" "1 X" 2 3 4 "5 X" 6 7 8 "9 X" >result.1-5-9 &&

 	create_merge_msgs() {
 		echo "Merge commit '\''c2'\''" >msg.1-5 &&
 		echo "Merge commit '\''c2'\''; commit '\''c3'\''" >msg.1-5-9 &&
 		{
 			echo "Squashed commit of the following:" &&
 			echo &&
 			git log --no-merges ^HEAD c1
 		} >squash.1 &&
 		{
 			echo "Squashed commit of the following:" &&
 			echo &&
 			git log --no-merges ^HEAD c2
 		} >squash.1-5 &&
 		{
 			echo "Squashed commit of the following:" &&
 			echo &&
 			git log --no-merges ^HEAD c2 c3
 		} >squash.1-5-9 &&
 		echo >msg.nolog &&
 		{
 			echo "* commit '\''c3'\'':" &&
 			echo "  commit 3" &&
 			echo
 		} >msg.log
 	} &&

 	verify_merge() {
 		test_cmp "$2" "$1" &&
 		git update-index --refresh &&
 		git diff --exit-code &&
 		if test -n "$3"
 		then
 			git show -s --pretty=format:%s HEAD >msg.act &&
 			test_cmp "$3" msg.act
 		fi
 	} &&

 	verify_head() {
 		echo "$1" >head.expected &&
 		git rev-parse HEAD >head.actual &&
 		test_cmp head.expected head.actual
 	} &&

 	verify_parents() {
 		printf "%s\n" "$@" >parents.expected &&
 		>parents.actual &&
 		i=1 &&
 		while test $i -le $#
 		do
 			git rev-parse HEAD^$i >>parents.actual &&
 			i=$(expr $i + 1) ||
 			return 1
 		done &&
 		test_cmp parents.expected parents.actual
 	} &&

 	verify_mergeheads() {
 		printf "%s\n" "$@" >mergehead.expected &&
 		test_cmp mergehead.expected .git/MERGE_HEAD
 	} &&

 	verify_no_mergehead() {
 		! test -e .git/MERGE_HEAD
 	}
 '

 test_expect_success 'setup' '
 	git add file &&
 	test_tick &&
 	git commit -m "commit 0" &&
 	git tag c0 &&
 	c0=$(git rev-parse HEAD) &&
 	cp file.1 file &&
 	git add file &&
 	test_tick &&
 	git commit -m "commit 1" &&
 	git tag c1 &&
 	c1=$(git rev-parse HEAD) &&
 	git reset --hard "$c0" &&
 	cp file.5 file &&
 	git add file &&
 	test_tick &&
 	git commit -m "commit 2" &&
 	git tag c2 &&
 	c2=$(git rev-parse HEAD) &&
 	git reset --hard "$c0" &&
 	cp file.9 file &&
 	git add file &&
 	test_tick &&
 	git commit -m "commit 3" &&
 	git tag c3 &&
 	c3=$(git rev-parse HEAD)
 	git reset --hard "$c0" &&
 	create_merge_msgs
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'test option parsing' '
 	test_must_fail git merge -$ c1 &&
 	test_must_fail git merge --no-such c1 &&
 	test_must_fail git merge -s foobar c1 &&
 	test_must_fail git merge -s=foobar c1 &&
 	test_must_fail git merge -m &&
 	test_must_fail git merge
 '

 test_expect_success 'merge -h with invalid index' '
 	mkdir broken &&
 	(
 		cd broken &&
 		git init &&
 		>.git/index &&
 		test_expect_code 129 git merge -h 2>usage
 	) &&
 	grep "[Uu]sage: git merge" broken/usage
 '

 test_expect_success 'reject non-strategy with a git-merge-foo name' '
 	test_must_fail git merge -s index c1
 '

 test_expect_success 'merge c0 with c1' '
 	echo "OBJID HEAD@{0}: merge c1: Fast-forward" >reflog.expected &&

 	git reset --hard c0 &&
 	git merge c1 &&
 	verify_merge file result.1 &&
 	verify_head "$c1" &&

 	git reflog -1 >reflog.actual &&
 	sed "s/$_x05[0-9a-f]*/OBJID/g" reflog.actual >reflog.fuzzy &&
 	test_cmp reflog.expected reflog.fuzzy
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c0 with c1 with --ff-only' '
 	git reset --hard c0 &&
 	git merge --ff-only c1 &&
 	git merge --ff-only HEAD c0 c1 &&
 	verify_merge file result.1 &&
 	verify_head "$c1"
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge from unborn branch' '
 	git checkout -f master &&
 	test_might_fail git branch -D kid &&

 	echo "OBJID HEAD@{0}: initial pull" >reflog.expected &&

 	git checkout --orphan kid &&
 	test_when_finished "git checkout -f master" &&
 	git rm -fr . &&
 	test_tick &&
 	git merge --ff-only c1 &&
 	verify_merge file result.1 &&
 	verify_head "$c1" &&

 	git reflog -1 >reflog.actual &&
 	sed "s/$_x05[0-9a-f][0-9a-f]/OBJID/g" reflog.actual >reflog.fuzzy &&
 	test_cmp reflog.expected reflog.fuzzy
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c2' '
 	git reset --hard c1 &&
 	test_tick &&
 	git merge c2 &&
 	verify_merge file result.1-5 msg.1-5 &&
 	verify_parents $c1 $c2
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c2 and c3' '
 	git reset --hard c1 &&
 	test_tick &&
 	git merge c2 c3 &&
 	verify_merge file result.1-5-9 msg.1-5-9 &&
 	verify_parents $c1 $c2 $c3
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'failing merges with --ff-only' '
 	git reset --hard c1 &&
 	test_tick &&
 	test_must_fail git merge --ff-only c2 &&
 	test_must_fail git merge --ff-only c3 &&
 	test_must_fail git merge --ff-only c2 c3
 '

 test_expect_success 'merge c0 with c1 (no-commit)' '
 	git reset --hard c0 &&
 	git merge --no-commit c1 &&
 	verify_merge file result.1 &&
 	verify_head $c1
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c2 (no-commit)' '
 	git reset --hard c1 &&
 	git merge --no-commit c2 &&
 	verify_merge file result.1-5 &&
 	verify_head $c1 &&
 	verify_mergeheads $c2
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c2 and c3 (no-commit)' '
 	git reset --hard c1 &&
 	git merge --no-commit c2 c3 &&
 	verify_merge file result.1-5-9 &&
 	verify_head $c1 &&
 	verify_mergeheads $c2 $c3
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c0 with c1 (squash)' '
 	git reset --hard c0 &&
 	git merge --squash c1 &&
 	verify_merge file result.1 &&
 	verify_head $c0 &&
 	verify_no_mergehead &&
 	test_cmp squash.1 .git/SQUASH_MSG
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c0 with c1 (squash, ff-only)' '
 	git reset --hard c0 &&
 	git merge --squash --ff-only c1 &&
 	verify_merge file result.1 &&
 	verify_head $c0 &&
 	verify_no_mergehead &&
 	test_cmp squash.1 .git/SQUASH_MSG
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c2 (squash)' '
 	git reset --hard c1 &&
 	git merge --squash c2 &&
 	verify_merge file result.1-5 &&
 	verify_head $c1 &&
 	verify_no_mergehead &&
 	test_cmp squash.1-5 .git/SQUASH_MSG
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'unsuccesful merge of c1 with c2 (squash, ff-only)' '
 	git reset --hard c1 &&
 	test_must_fail git merge --squash --ff-only c2
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c2 and c3 (squash)' '
 	git reset --hard c1 &&
 	git merge --squash c2 c3 &&
 	verify_merge file result.1-5-9 &&
 	verify_head $c1 &&
 	verify_no_mergehead &&
 	test_cmp squash.1-5-9 .git/SQUASH_MSG
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c2 (no-commit in config)' '
 	git reset --hard c1 &&
 	git config branch.master.mergeoptions "--no-commit" &&
 	git merge c2 &&
 	verify_merge file result.1-5 &&
 	verify_head $c1 &&
 	verify_mergeheads $c2
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c2 (squash in config)' '
 	git reset --hard c1 &&
 	git config branch.master.mergeoptions "--squash" &&
 	git merge c2 &&
 	verify_merge file result.1-5 &&
 	verify_head $c1 &&
 	verify_no_mergehead &&
 	test_cmp squash.1-5 .git/SQUASH_MSG
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'override config option -n with --summary' '
 	git reset --hard c1 &&
 	git config branch.master.mergeoptions "-n" &&
 	test_tick &&
 	git merge --summary c2 >diffstat.txt &&
 	verify_merge file result.1-5 msg.1-5 &&
 	verify_parents $c1 $c2 &&
 	if ! grep "^ file |  *2 +-$" diffstat.txt
 	then
 		echo "[OOPS] diffstat was not generated with --summary"
 		false
 	fi
 '

 test_expect_success 'override config option -n with --stat' '
 	git reset --hard c1 &&
 	git config branch.master.mergeoptions "-n" &&
 	test_tick &&
 	git merge --stat c2 >diffstat.txt &&
 	verify_merge file result.1-5 msg.1-5 &&
 	verify_parents $c1 $c2 &&
 	if ! grep "^ file |  *2 +-$" diffstat.txt
 	then
 		echo "[OOPS] diffstat was not generated with --stat"
 		false
 	fi
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'override config option --stat' '
 	git reset --hard c1 &&
 	git config branch.master.mergeoptions "--stat" &&
 	test_tick &&
 	git merge -n c2 >diffstat.txt &&
 	verify_merge file result.1-5 msg.1-5 &&
 	verify_parents $c1 $c2 &&
 	if grep "^ file |  *2 +-$" diffstat.txt
 	then
 		echo "[OOPS] diffstat was generated"
 		false
 	fi
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c2 (override --no-commit)' '
 	git reset --hard c1 &&
 	git config branch.master.mergeoptions "--no-commit" &&
 	test_tick &&
 	git merge --commit c2 &&
 	verify_merge file result.1-5 msg.1-5 &&
 	verify_parents $c1 $c2
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c2 (override --squash)' '
 	git reset --hard c1 &&
 	git config branch.master.mergeoptions "--squash" &&
 	test_tick &&
 	git merge --no-squash c2 &&
 	verify_merge file result.1-5 msg.1-5 &&
 	verify_parents $c1 $c2
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c0 with c1 (no-ff)' '
 	git reset --hard c0 &&
 	git config branch.master.mergeoptions "" &&
 	test_tick &&
 	git merge --no-ff c1 &&
 	verify_merge file result.1 &&
 	verify_parents $c0 $c1
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'combining --squash and --no-ff is refused' '
 	test_must_fail git merge --squash --no-ff c1 &&
 	test_must_fail git merge --no-ff --squash c1
 '

 test_expect_success 'combining --ff-only and --no-ff is refused' '
 	test_must_fail git merge --ff-only --no-ff c1 &&
 	test_must_fail git merge --no-ff --ff-only c1
 '

 test_expect_success 'merge c0 with c1 (ff overrides no-ff)' '
 	git reset --hard c0 &&
 	git config branch.master.mergeoptions "--no-ff" &&
 	git merge --ff c1 &&
 	verify_merge file result.1 &&
 	verify_head $c1
 '

 test_expect_success 'merge log message' '
 	git reset --hard c0 &&
 	git merge --no-log c2 &&
 	git show -s --pretty=format:%b HEAD >msg.act &&
 	test_cmp msg.nolog msg.act &&

 	git merge --log c3 &&
 	git show -s --pretty=format:%b HEAD >msg.act &&
 	test_cmp msg.log msg.act &&

 	git reset --hard HEAD^ &&
 	git config merge.log yes &&
 	git merge c3 &&
 	git show -s --pretty=format:%b HEAD >msg.act &&
 	test_cmp msg.log msg.act
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c0, c2, c0, and c1' '
        git reset --hard c1 &&
        git config branch.master.mergeoptions "" &&
        test_tick &&
        git merge c0 c2 c0 c1 &&
        verify_merge file result.1-5 &&
        verify_parents $c1 $c2
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c0, c2, c0, and c1' '
        git reset --hard c1 &&
        git config branch.master.mergeoptions "" &&
        test_tick &&
        git merge c0 c2 c0 c1 &&
        verify_merge file result.1-5 &&
        verify_parents $c1 $c2
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge c1 with c1 and c2' '
        git reset --hard c1 &&
        git config branch.master.mergeoptions "" &&
        test_tick &&
        git merge c1 c2 &&
        verify_merge file result.1-5 &&
        verify_parents $c1 $c2
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge fast-forward in a dirty tree' '
        git reset --hard c0 &&
        mv file file1 &&
        cat file1 >file &&
        rm -f file1 &&
        git merge c2
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'in-index merge' '
 	git reset --hard c0 &&
 	git merge --no-ff -s resolve c1 >out &&
 	grep "Wonderful." out &&
 	verify_parents $c0 $c1
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'refresh the index before merging' '
 	git reset --hard c1 &&
 	cp file file.n && mv -f file.n file &&
 	git merge c3
 '

 cat >expected.branch <<\EOF
 Merge branch 'c5-branch' (early part)
 EOF
 cat >expected.tag <<\EOF
 Merge commit 'c5~1'
 EOF

 test_expect_success 'merge early part of c2' '
 	git reset --hard c3 &&
 	echo c4 >c4.c &&
 	git add c4.c &&
 	git commit -m c4 &&
 	git tag c4 &&
 	echo c5 >c5.c &&
 	git add c5.c &&
 	git commit -m c5 &&
 	git tag c5 &&
 	git reset --hard c3 &&
 	echo c6 >c6.c &&
 	git add c6.c &&
 	git commit -m c6 &&
 	git tag c6 &&
 	git branch -f c5-branch c5 &&
 	git merge c5-branch~1 &&
 	git show -s --pretty=format:%s HEAD >actual.branch &&
 	git reset --keep HEAD^ &&
 	git merge c5~1 &&
 	git show -s --pretty=format:%s HEAD >actual.tag &&
 	test_cmp expected.branch actual.branch &&
 	test_cmp expected.tag actual.tag
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'merge --no-ff --no-commit && commit' '
 	git reset --hard c0 &&
 	git merge --no-ff --no-commit c1 &&
 	EDITOR=: git commit &&
 	verify_parents $c0 $c1
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_expect_success 'amending no-ff merge commit' '
 	EDITOR=: git commit --amend &&
 	verify_parents $c0 $c1
 '

 test_debug 'git log --graph --decorate --oneline --all'

 test_done
	#!/bin/sh
	#
	# Copyright (c) 2007 Lars Hjemli
	#

	test_description='git merge

	Testing basic merge operations/option parsing.

	! [c0] commit 0
	! [c1] commit 1
	! [c2] commit 2
	! [c3] commit 3
	! [c4] c4
	! [c5] c5
	! [c6] c6
	* [master] Merge commit 'c1'
	--------
	- [master] Merge commit 'c1'
	+ * [c1] commit 1
	+ [c6] c6
	+ [c5] c5
	++ [c4] c4
	++++ [c3] commit 3
	+ [c2] commit 2
	+++++++* [c0] commit 0
	'

	. ./test-lib.sh

	test_expect_success 'set up test data and helpers' '
	printf "%s\n" 1 2 3 4 5 6 7 8 9 >file &&
	printf "%s\n" "1 X" 2 3 4 5 6 7 8 9 >file.1 &&
	printf "%s\n" 1 2 3 4 "5 X" 6 7 8 9 >file.5 &&
	printf "%s\n" 1 2 3 4 5 6 7 8 "9 X" >file.9 &&
	printf "%s\n" "1 X" 2 3 4 5 6 7 8 9 >result.1 &&
	printf "%s\n" "1 X" 2 3 4 "5 X" 6 7 8 9 >result.1-5 &&
	printf "%s\n" "1 X" 2 3 4 "5 X" 6 7 8 "9 X" >result.1-5-9 &&

	create_merge_msgs() {
	echo "Merge commit '\''c2'\''" >msg.1-5 &&
	echo "Merge commit '\''c2'\''; commit '\''c3'\''" >msg.1-5-9 &&
	{
	echo "Squashed commit of the following:" &&
	echo &&
	git log --no-merges ^HEAD c1
	} >squash.1 &&
	{
	echo "Squashed commit of the following:" &&
	echo &&
	git log --no-merges ^HEAD c2
	} >squash.1-5 &&
	{
	echo "Squashed commit of the following:" &&
	echo &&
	git log --no-merges ^HEAD c2 c3
	} >squash.1-5-9 &&
	echo >msg.nolog &&
	{
	echo "* commit '\''c3'\'':" &&
	echo " commit 3" &&
	echo
	} >msg.log
	} &&

	verify_merge() {
	test_cmp "$2" "$1" &&
	git update-index --refresh &&
	git diff --exit-code &&
	if test -n "$3"
	then
	git show -s --pretty=format:%s HEAD >msg.act &&
	test_cmp "$3" msg.act
	fi
	} &&

	verify_head() {
	echo "$1" >head.expected &&
	git rev-parse HEAD >head.actual &&
	test_cmp head.expected head.actual
	} &&

	verify_parents() {
	printf "%s\n" "$@" >parents.expected &&
	>parents.actual &&
	i=1 &&
	while test $i -le $#
	do
	git rev-parse HEAD^$i >>parents.actual &&
	i=$(expr $i + 1) \|\|
	return 1
	done &&
	test_cmp parents.expected parents.actual
	} &&

	verify_mergeheads() {
	printf "%s\n" "$@" >mergehead.expected &&
	test_cmp mergehead.expected .git/MERGE_HEAD
	} &&

	verify_no_mergehead() {
	! test -e .git/MERGE_HEAD
	}
	'

	test_expect_success 'setup' '
	git add file &&
	test_tick &&
	git commit -m "commit 0" &&
	git tag c0 &&
	c0=$(git rev-parse HEAD) &&
	cp file.1 file &&
	git add file &&
	test_tick &&
	git commit -m "commit 1" &&
	git tag c1 &&
	c1=$(git rev-parse HEAD) &&
	git reset --hard "$c0" &&
	cp file.5 file &&
	git add file &&
	test_tick &&
	git commit -m "commit 2" &&
	git tag c2 &&
	c2=$(git rev-parse HEAD) &&
	git reset --hard "$c0" &&
	cp file.9 file &&
	git add file &&
	test_tick &&
	git commit -m "commit 3" &&
	git tag c3 &&
	c3=$(git rev-parse HEAD)
	git reset --hard "$c0" &&
	create_merge_msgs
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'test option parsing' '
	test_must_fail git merge -$ c1 &&
	test_must_fail git merge --no-such c1 &&
	test_must_fail git merge -s foobar c1 &&
	test_must_fail git merge -s=foobar c1 &&
	test_must_fail git merge -m &&
	test_must_fail git merge
	'

	test_expect_success 'merge -h with invalid index' '
	mkdir broken &&
	(
	cd broken &&
	git init &&
	>.git/index &&
	test_expect_code 129 git merge -h 2>usage
	) &&
	grep "[Uu]sage: git merge" broken/usage
	'

	test_expect_success 'reject non-strategy with a git-merge-foo name' '
	test_must_fail git merge -s index c1
	'

	test_expect_success 'merge c0 with c1' '
	echo "OBJID HEAD@{0}: merge c1: Fast-forward" >reflog.expected &&

	git reset --hard c0 &&
	git merge c1 &&
	verify_merge file result.1 &&
	verify_head "$c1" &&

	git reflog -1 >reflog.actual &&
	sed "s/$_x05[0-9a-f]*/OBJID/g" reflog.actual >reflog.fuzzy &&
	test_cmp reflog.expected reflog.fuzzy
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c0 with c1 with --ff-only' '
	git reset --hard c0 &&
	git merge --ff-only c1 &&
	git merge --ff-only HEAD c0 c1 &&
	verify_merge file result.1 &&
	verify_head "$c1"
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge from unborn branch' '
	git checkout -f master &&
	test_might_fail git branch -D kid &&

	echo "OBJID HEAD@{0}: initial pull" >reflog.expected &&

	git checkout --orphan kid &&
	test_when_finished "git checkout -f master" &&
	git rm -fr . &&
	test_tick &&
	git merge --ff-only c1 &&
	verify_merge file result.1 &&
	verify_head "$c1" &&

	git reflog -1 >reflog.actual &&
	sed "s/$_x05[0-9a-f][0-9a-f]/OBJID/g" reflog.actual >reflog.fuzzy &&
	test_cmp reflog.expected reflog.fuzzy
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c2' '
	git reset --hard c1 &&
	test_tick &&
	git merge c2 &&
	verify_merge file result.1-5 msg.1-5 &&
	verify_parents $c1 $c2
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c2 and c3' '
	git reset --hard c1 &&
	test_tick &&
	git merge c2 c3 &&
	verify_merge file result.1-5-9 msg.1-5-9 &&
	verify_parents $c1 $c2 $c3
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'failing merges with --ff-only' '
	git reset --hard c1 &&
	test_tick &&
	test_must_fail git merge --ff-only c2 &&
	test_must_fail git merge --ff-only c3 &&
	test_must_fail git merge --ff-only c2 c3
	'

	test_expect_success 'merge c0 with c1 (no-commit)' '
	git reset --hard c0 &&
	git merge --no-commit c1 &&
	verify_merge file result.1 &&
	verify_head $c1
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c2 (no-commit)' '
	git reset --hard c1 &&
	git merge --no-commit c2 &&
	verify_merge file result.1-5 &&
	verify_head $c1 &&
	verify_mergeheads $c2
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c2 and c3 (no-commit)' '
	git reset --hard c1 &&
	git merge --no-commit c2 c3 &&
	verify_merge file result.1-5-9 &&
	verify_head $c1 &&
	verify_mergeheads $c2 $c3
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c0 with c1 (squash)' '
	git reset --hard c0 &&
	git merge --squash c1 &&
	verify_merge file result.1 &&
	verify_head $c0 &&
	verify_no_mergehead &&
	test_cmp squash.1 .git/SQUASH_MSG
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c0 with c1 (squash, ff-only)' '
	git reset --hard c0 &&
	git merge --squash --ff-only c1 &&
	verify_merge file result.1 &&
	verify_head $c0 &&
	verify_no_mergehead &&
	test_cmp squash.1 .git/SQUASH_MSG
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c2 (squash)' '
	git reset --hard c1 &&
	git merge --squash c2 &&
	verify_merge file result.1-5 &&
	verify_head $c1 &&
	verify_no_mergehead &&
	test_cmp squash.1-5 .git/SQUASH_MSG
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'unsuccesful merge of c1 with c2 (squash, ff-only)' '
	git reset --hard c1 &&
	test_must_fail git merge --squash --ff-only c2
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c2 and c3 (squash)' '
	git reset --hard c1 &&
	git merge --squash c2 c3 &&
	verify_merge file result.1-5-9 &&
	verify_head $c1 &&
	verify_no_mergehead &&
	test_cmp squash.1-5-9 .git/SQUASH_MSG
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c2 (no-commit in config)' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "--no-commit" &&
	git merge c2 &&
	verify_merge file result.1-5 &&
	verify_head $c1 &&
	verify_mergeheads $c2
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c2 (squash in config)' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "--squash" &&
	git merge c2 &&
	verify_merge file result.1-5 &&
	verify_head $c1 &&
	verify_no_mergehead &&
	test_cmp squash.1-5 .git/SQUASH_MSG
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'override config option -n with --summary' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "-n" &&
	test_tick &&
	git merge --summary c2 >diffstat.txt &&
	verify_merge file result.1-5 msg.1-5 &&
	verify_parents $c1 $c2 &&
	if ! grep "^ file \| *2 +-$" diffstat.txt
	then
	echo "[OOPS] diffstat was not generated with --summary"
	false
	fi
	'

	test_expect_success 'override config option -n with --stat' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "-n" &&
	test_tick &&
	git merge --stat c2 >diffstat.txt &&
	verify_merge file result.1-5 msg.1-5 &&
	verify_parents $c1 $c2 &&
	if ! grep "^ file \| *2 +-$" diffstat.txt
	then
	echo "[OOPS] diffstat was not generated with --stat"
	false
	fi
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'override config option --stat' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "--stat" &&
	test_tick &&
	git merge -n c2 >diffstat.txt &&
	verify_merge file result.1-5 msg.1-5 &&
	verify_parents $c1 $c2 &&
	if grep "^ file \| *2 +-$" diffstat.txt
	then
	echo "[OOPS] diffstat was generated"
	false
	fi
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c2 (override --no-commit)' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "--no-commit" &&
	test_tick &&
	git merge --commit c2 &&
	verify_merge file result.1-5 msg.1-5 &&
	verify_parents $c1 $c2
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c2 (override --squash)' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "--squash" &&
	test_tick &&
	git merge --no-squash c2 &&
	verify_merge file result.1-5 msg.1-5 &&
	verify_parents $c1 $c2
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c0 with c1 (no-ff)' '
	git reset --hard c0 &&
	git config branch.master.mergeoptions "" &&
	test_tick &&
	git merge --no-ff c1 &&
	verify_merge file result.1 &&
	verify_parents $c0 $c1
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'combining --squash and --no-ff is refused' '
	test_must_fail git merge --squash --no-ff c1 &&
	test_must_fail git merge --no-ff --squash c1
	'

	test_expect_success 'combining --ff-only and --no-ff is refused' '
	test_must_fail git merge --ff-only --no-ff c1 &&
	test_must_fail git merge --no-ff --ff-only c1
	'

	test_expect_success 'merge c0 with c1 (ff overrides no-ff)' '
	git reset --hard c0 &&
	git config branch.master.mergeoptions "--no-ff" &&
	git merge --ff c1 &&
	verify_merge file result.1 &&
	verify_head $c1
	'

	test_expect_success 'merge log message' '
	git reset --hard c0 &&
	git merge --no-log c2 &&
	git show -s --pretty=format:%b HEAD >msg.act &&
	test_cmp msg.nolog msg.act &&

	git merge --log c3 &&
	git show -s --pretty=format:%b HEAD >msg.act &&
	test_cmp msg.log msg.act &&

	git reset --hard HEAD^ &&
	git config merge.log yes &&
	git merge c3 &&
	git show -s --pretty=format:%b HEAD >msg.act &&
	test_cmp msg.log msg.act
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c0, c2, c0, and c1' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "" &&
	test_tick &&
	git merge c0 c2 c0 c1 &&
	verify_merge file result.1-5 &&
	verify_parents $c1 $c2
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c0, c2, c0, and c1' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "" &&
	test_tick &&
	git merge c0 c2 c0 c1 &&
	verify_merge file result.1-5 &&
	verify_parents $c1 $c2
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge c1 with c1 and c2' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "" &&
	test_tick &&
	git merge c1 c2 &&
	verify_merge file result.1-5 &&
	verify_parents $c1 $c2
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge fast-forward in a dirty tree' '
	git reset --hard c0 &&
	mv file file1 &&
	cat file1 >file &&
	rm -f file1 &&
	git merge c2
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'in-index merge' '
	git reset --hard c0 &&
	git merge --no-ff -s resolve c1 >out &&
	grep "Wonderful." out &&
	verify_parents $c0 $c1
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'refresh the index before merging' '
	git reset --hard c1 &&
	cp file file.n && mv -f file.n file &&
	git merge c3
	'

	cat >expected.branch <<\EOF
	Merge branch 'c5-branch' (early part)
	EOF
	cat >expected.tag <<\EOF
	Merge commit 'c5~1'
	EOF

	test_expect_success 'merge early part of c2' '
	git reset --hard c3 &&
	echo c4 >c4.c &&
	git add c4.c &&
	git commit -m c4 &&
	git tag c4 &&
	echo c5 >c5.c &&
	git add c5.c &&
	git commit -m c5 &&
	git tag c5 &&
	git reset --hard c3 &&
	echo c6 >c6.c &&
	git add c6.c &&
	git commit -m c6 &&
	git tag c6 &&
	git branch -f c5-branch c5 &&
	git merge c5-branch~1 &&
	git show -s --pretty=format:%s HEAD >actual.branch &&
	git reset --keep HEAD^ &&
	git merge c5~1 &&
	git show -s --pretty=format:%s HEAD >actual.tag &&
	test_cmp expected.branch actual.branch &&
	test_cmp expected.tag actual.tag
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'merge --no-ff --no-commit && commit' '
	git reset --hard c0 &&
	git merge --no-ff --no-commit c1 &&
	EDITOR=: git commit &&
	verify_parents $c0 $c1
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_expect_success 'amending no-ff merge commit' '
	EDITOR=: git commit --amend &&
	verify_parents $c0 $c1
	'

	test_debug 'git log --graph --decorate --oneline --all'

	test_done