t/t6030-bisect-porcelain.sh - git - Git at Google

 #!/bin/sh
 #
 # Copyright (c) 2007 Christian Couder
 #
 test_description='Tests git bisect functionality'

 exec </dev/null

 . ./test-lib.sh

 add_line_into_file()
 {
     _line=$1
     _file=$2

     if [ -f "$_file" ]; then
         echo "$_line" >> $_file || return $?
         MSG="Add <$_line> into <$_file>."
     else
         echo "$_line" > $_file || return $?
         git add $_file || return $?
         MSG="Create file <$_file> with <$_line> inside."
     fi

     test_tick
     git commit --quiet -m "$MSG" $_file
 }

 HASH1=
 HASH2=
 HASH3=
 HASH4=

 test_expect_success 'set up basic repo with 1 file (hello) and 4 commits' '
      add_line_into_file "1: Hello World" hello &&
      HASH1=$(git rev-parse --verify HEAD) &&
      add_line_into_file "2: A new day for git" hello &&
      HASH2=$(git rev-parse --verify HEAD) &&
      add_line_into_file "3: Another new day for git" hello &&
      HASH3=$(git rev-parse --verify HEAD) &&
      add_line_into_file "4: Ciao for now" hello &&
      HASH4=$(git rev-parse --verify HEAD)
 '

 test_expect_success 'bisect starts with only one bad' '
 	git bisect reset &&
 	git bisect start &&
 	git bisect bad $HASH4 &&
 	git bisect next
 '

 test_expect_success 'bisect does not start with only one good' '
 	git bisect reset &&
 	git bisect start &&
 	git bisect good $HASH1 || return 1

 	if git bisect next
 	then
 		echo Oops, should have failed.
 		false
 	else
 		:
 	fi
 '

 test_expect_success 'bisect start with one bad and good' '
 	git bisect reset &&
 	git bisect start &&
 	git bisect good $HASH1 &&
 	git bisect bad $HASH4 &&
 	git bisect next
 '

 test_expect_success 'bisect fails if given any junk instead of revs' '
 	git bisect reset &&
 	test_must_fail git bisect start foo $HASH1 -- &&
 	test_must_fail git bisect start $HASH4 $HASH1 bar -- &&
 	test -z "$(git for-each-ref "refs/bisect/*")" &&
 	test -z "$(ls .git/BISECT_* 2>/dev/null)" &&
 	git bisect start &&
 	test_must_fail git bisect good foo $HASH1 &&
 	test_must_fail git bisect good $HASH1 bar &&
 	test_must_fail git bisect bad frotz &&
 	test_must_fail git bisect bad $HASH3 $HASH4 &&
 	test_must_fail git bisect skip bar $HASH3 &&
 	test_must_fail git bisect skip $HASH1 foo &&
 	test -z "$(git for-each-ref "refs/bisect/*")" &&
 	git bisect good $HASH1 &&
 	git bisect bad $HASH4
 '

 test_expect_success 'bisect reset: back in the master branch' '
 	git bisect reset &&
 	echo "* master" > branch.expect &&
 	git branch > branch.output &&
 	cmp branch.expect branch.output
 '

 test_expect_success 'bisect reset: back in another branch' '
 	git checkout -b other &&
 	git bisect start &&
 	git bisect good $HASH1 &&
 	git bisect bad $HASH3 &&
 	git bisect reset &&
 	echo "  master" > branch.expect &&
 	echo "* other" >> branch.expect &&
 	git branch > branch.output &&
 	cmp branch.expect branch.output
 '

 test_expect_success 'bisect reset when not bisecting' '
 	git bisect reset &&
 	git branch > branch.output &&
 	cmp branch.expect branch.output
 '

 test_expect_success 'bisect reset removes packed refs' '
 	git bisect reset &&
 	git bisect start &&
 	git bisect good $HASH1 &&
 	git bisect bad $HASH3 &&
 	git pack-refs --all --prune &&
 	git bisect next &&
 	git bisect reset &&
 	test -z "$(git for-each-ref "refs/bisect/*")" &&
 	test -z "$(git for-each-ref "refs/heads/bisect")"
 '

 test_expect_success 'bisect start: back in good branch' '
 	git branch > branch.output &&
 	grep "* other" branch.output > /dev/null &&
 	git bisect start $HASH4 $HASH1 -- &&
 	git bisect good &&
 	git bisect start $HASH4 $HASH1 -- &&
 	git bisect bad &&
 	git bisect reset &&
 	git branch > branch.output &&
 	grep "* other" branch.output > /dev/null
 '

 test_expect_success 'bisect start: no ".git/BISECT_START" if junk rev' '
 	git bisect start $HASH4 $HASH1 -- &&
 	git bisect good &&
 	test_must_fail git bisect start $HASH4 foo -- &&
 	git branch > branch.output &&
 	grep "* other" branch.output > /dev/null &&
 	test_must_fail test -e .git/BISECT_START
 '

 test_expect_success 'bisect start: no ".git/BISECT_START" if mistaken rev' '
 	git bisect start $HASH4 $HASH1 -- &&
 	git bisect good &&
 	test_must_fail git bisect start $HASH1 $HASH4 -- &&
 	git branch > branch.output &&
 	grep "* other" branch.output > /dev/null &&
 	test_must_fail test -e .git/BISECT_START
 '

 test_expect_success 'bisect start: no ".git/BISECT_START" if checkout error' '
 	echo "temp stuff" > hello &&
 	test_must_fail git bisect start $HASH4 $HASH1 -- &&
 	git branch &&
 	git branch > branch.output &&
 	grep "* other" branch.output > /dev/null &&
 	test_must_fail test -e .git/BISECT_START &&
 	test -z "$(git for-each-ref "refs/bisect/*")" &&
 	git checkout HEAD hello
 '

 # $HASH1 is good, $HASH4 is bad, we skip $HASH3
 # but $HASH2 is bad,
 # so we should find $HASH2 as the first bad commit
 test_expect_success 'bisect skip: successfull result' '
 	git bisect reset &&
 	git bisect start $HASH4 $HASH1 &&
 	git bisect skip &&
 	git bisect bad > my_bisect_log.txt &&
 	grep "$HASH2 is first bad commit" my_bisect_log.txt &&
 	git bisect reset
 '

 # $HASH1 is good, $HASH4 is bad, we skip $HASH3 and $HASH2
 # so we should not be able to tell the first bad commit
 # among $HASH2, $HASH3 and $HASH4
 test_expect_success 'bisect skip: cannot tell between 3 commits' '
 	git bisect start $HASH4 $HASH1 &&
 	git bisect skip || return 1

 	if git bisect skip > my_bisect_log.txt
 	then
 		echo Oops, should have failed.
 		false
 	else
 		test $? -eq 2 &&
 		grep "first bad commit could be any of" my_bisect_log.txt &&
 		! grep $HASH1 my_bisect_log.txt &&
 		grep $HASH2 my_bisect_log.txt &&
 		grep $HASH3 my_bisect_log.txt &&
 		grep $HASH4 my_bisect_log.txt &&
 		git bisect reset
 	fi
 '

 # $HASH1 is good, $HASH4 is bad, we skip $HASH3
 # but $HASH2 is good,
 # so we should not be able to tell the first bad commit
 # among $HASH3 and $HASH4
 test_expect_success 'bisect skip: cannot tell between 2 commits' '
 	git bisect start $HASH4 $HASH1 &&
 	git bisect skip || return 1

 	if git bisect good > my_bisect_log.txt
 	then
 		echo Oops, should have failed.
 		false
 	else
 		test $? -eq 2 &&
 		grep "first bad commit could be any of" my_bisect_log.txt &&
 		! grep $HASH1 my_bisect_log.txt &&
 		! grep $HASH2 my_bisect_log.txt &&
 		grep $HASH3 my_bisect_log.txt &&
 		grep $HASH4 my_bisect_log.txt &&
 		git bisect reset
 	fi
 '

 # $HASH1 is good, $HASH4 is both skipped and bad, we skip $HASH3
 # and $HASH2 is good,
 # so we should not be able to tell the first bad commit
 # among $HASH3 and $HASH4
 test_expect_success 'bisect skip: with commit both bad and skipped' '
 	git bisect start &&
 	git bisect skip &&
 	git bisect bad &&
 	git bisect good $HASH1 &&
 	git bisect skip &&
 	if git bisect good > my_bisect_log.txt
 	then
 		echo Oops, should have failed.
 		false
 	else
 		test $? -eq 2 &&
 		grep "first bad commit could be any of" my_bisect_log.txt &&
 		! grep $HASH1 my_bisect_log.txt &&
 		! grep $HASH2 my_bisect_log.txt &&
 		grep $HASH3 my_bisect_log.txt &&
 		grep $HASH4 my_bisect_log.txt &&
 		git bisect reset
 	fi
 '

 # We want to automatically find the commit that
 # introduced "Another" into hello.
 test_expect_success \
     '"git bisect run" simple case' \
     'echo "#"\!"/bin/sh" > test_script.sh &&
      echo "grep Another hello > /dev/null" >> test_script.sh &&
      echo "test \$? -ne 0" >> test_script.sh &&
      chmod +x test_script.sh &&
      git bisect start &&
      git bisect good $HASH1 &&
      git bisect bad $HASH4 &&
      git bisect run ./test_script.sh > my_bisect_log.txt &&
      grep "$HASH3 is first bad commit" my_bisect_log.txt &&
      git bisect reset'

 # We want to automatically find the commit that
 # introduced "Ciao" into hello.
 test_expect_success \
     '"git bisect run" with more complex "git bisect start"' \
     'echo "#"\!"/bin/sh" > test_script.sh &&
      echo "grep Ciao hello > /dev/null" >> test_script.sh &&
      echo "test \$? -ne 0" >> test_script.sh &&
      chmod +x test_script.sh &&
      git bisect start $HASH4 $HASH1 &&
      git bisect run ./test_script.sh > my_bisect_log.txt &&
      grep "$HASH4 is first bad commit" my_bisect_log.txt &&
      git bisect reset'

 # $HASH1 is good, $HASH5 is bad, we skip $HASH3
 # but $HASH4 is good,
 # so we should find $HASH5 as the first bad commit
 HASH5=
 test_expect_success 'bisect skip: add line and then a new test' '
 	add_line_into_file "5: Another new line." hello &&
 	HASH5=$(git rev-parse --verify HEAD) &&
 	git bisect start $HASH5 $HASH1 &&
 	git bisect skip &&
 	git bisect good > my_bisect_log.txt &&
 	grep "$HASH5 is first bad commit" my_bisect_log.txt &&
 	git bisect log > log_to_replay.txt &&
 	git bisect reset
 '

 test_expect_success 'bisect skip and bisect replay' '
 	git bisect replay log_to_replay.txt > my_bisect_log.txt &&
 	grep "$HASH5 is first bad commit" my_bisect_log.txt &&
 	git bisect reset
 '

 HASH6=
 test_expect_success 'bisect run & skip: cannot tell between 2' '
 	add_line_into_file "6: Yet a line." hello &&
 	HASH6=$(git rev-parse --verify HEAD) &&
 	echo "#"\!"/bin/sh" > test_script.sh &&
 	echo "sed -ne \\\$p hello | grep Ciao > /dev/null && exit 125" >> test_script.sh &&
 	echo "grep line hello > /dev/null" >> test_script.sh &&
 	echo "test \$? -ne 0" >> test_script.sh &&
 	chmod +x test_script.sh &&
 	git bisect start $HASH6 $HASH1 &&
 	if git bisect run ./test_script.sh > my_bisect_log.txt
 	then
 		echo Oops, should have failed.
 		false
 	else
 		test $? -eq 2 &&
 		grep "first bad commit could be any of" my_bisect_log.txt &&
 		! grep $HASH3 my_bisect_log.txt &&
 		! grep $HASH6 my_bisect_log.txt &&
 		grep $HASH4 my_bisect_log.txt &&
 		grep $HASH5 my_bisect_log.txt
 	fi
 '

 HASH7=
 test_expect_success 'bisect run & skip: find first bad' '
 	git bisect reset &&
 	add_line_into_file "7: Should be the last line." hello &&
 	HASH7=$(git rev-parse --verify HEAD) &&
 	echo "#"\!"/bin/sh" > test_script.sh &&
 	echo "sed -ne \\\$p hello | grep Ciao > /dev/null && exit 125" >> test_script.sh &&
 	echo "sed -ne \\\$p hello | grep day > /dev/null && exit 125" >> test_script.sh &&
 	echo "grep Yet hello > /dev/null" >> test_script.sh &&
 	echo "test \$? -ne 0" >> test_script.sh &&
 	chmod +x test_script.sh &&
 	git bisect start $HASH7 $HASH1 &&
 	git bisect run ./test_script.sh > my_bisect_log.txt &&
 	grep "$HASH6 is first bad commit" my_bisect_log.txt
 '

 test_expect_success 'bisect skip only one range' '
 	git bisect reset &&
 	git bisect start $HASH7 $HASH1 &&
 	git bisect skip $HASH1..$HASH5 &&
 	test "$HASH6" = "$(git rev-parse --verify HEAD)" &&
 	test_must_fail git bisect bad > my_bisect_log.txt &&
 	grep "first bad commit could be any of" my_bisect_log.txt
 '

 test_expect_success 'bisect skip many ranges' '
 	git bisect start $HASH7 $HASH1 &&
 	test "$HASH4" = "$(git rev-parse --verify HEAD)" &&
 	git bisect skip $HASH2 $HASH2.. ..$HASH5 &&
 	test "$HASH6" = "$(git rev-parse --verify HEAD)" &&
 	test_must_fail git bisect bad > my_bisect_log.txt &&
 	grep "first bad commit could be any of" my_bisect_log.txt
 '

 test_expect_success 'bisect starting with a detached HEAD' '
 	git bisect reset &&
 	git checkout master^ &&
 	HEAD=$(git rev-parse --verify HEAD) &&
 	git bisect start &&
 	test $HEAD = $(cat .git/BISECT_START) &&
 	git bisect reset &&
 	test $HEAD = $(git rev-parse --verify HEAD)
 '

 test_expect_success 'bisect errors out if bad and good are mistaken' '
 	git bisect reset &&
 	test_must_fail git bisect start $HASH2 $HASH4 2> rev_list_error &&
 	grep "mistake good and bad" rev_list_error &&
 	git bisect reset
 '

 test_expect_success 'bisect does not create a "bisect" branch' '
 	git bisect reset &&
 	git bisect start $HASH7 $HASH1 &&
 	git branch bisect &&
 	rev_hash4=$(git rev-parse --verify HEAD) &&
 	test "$rev_hash4" = "$HASH4" &&
 	git branch -D bisect &&
 	git bisect good &&
 	git branch bisect &&
 	rev_hash6=$(git rev-parse --verify HEAD) &&
 	test "$rev_hash6" = "$HASH6" &&
 	git bisect good > my_bisect_log.txt &&
 	grep "$HASH7 is first bad commit" my_bisect_log.txt &&
 	git bisect reset &&
 	rev_hash6=$(git rev-parse --verify bisect) &&
 	test "$rev_hash6" = "$HASH6" &&
 	git branch -D bisect
 '

 # This creates a "side" branch to test "siblings" cases.
 #
 # H1-H2-H3-H4-H5-H6-H7  <--other
 #            \
 #             S5-S6-S7  <--side
 #
 test_expect_success 'side branch creation' '
 	git bisect reset &&
 	git checkout -b side $HASH4 &&
 	add_line_into_file "5(side): first line on a side branch" hello2 &&
 	SIDE_HASH5=$(git rev-parse --verify HEAD) &&
 	add_line_into_file "6(side): second line on a side branch" hello2 &&
 	SIDE_HASH6=$(git rev-parse --verify HEAD) &&
 	add_line_into_file "7(side): third line on a side branch" hello2 &&
 	SIDE_HASH7=$(git rev-parse --verify HEAD)
 '

 test_expect_success 'good merge base when good and bad are siblings' '
 	git bisect start "$HASH7" "$SIDE_HASH7" > my_bisect_log.txt &&
 	grep "merge base must be tested" my_bisect_log.txt &&
 	grep $HASH4 my_bisect_log.txt &&
 	git bisect good > my_bisect_log.txt &&
 	test_must_fail grep "merge base must be tested" my_bisect_log.txt &&
 	grep $HASH6 my_bisect_log.txt &&
 	git bisect reset
 '
 test_expect_success 'skipped merge base when good and bad are siblings' '
 	git bisect start "$SIDE_HASH7" "$HASH7" > my_bisect_log.txt &&
 	grep "merge base must be tested" my_bisect_log.txt &&
 	grep $HASH4 my_bisect_log.txt &&
 	git bisect skip > my_bisect_log.txt 2>&1 &&
 	grep "Warning" my_bisect_log.txt &&
 	grep $SIDE_HASH6 my_bisect_log.txt &&
 	git bisect reset
 '

 test_expect_success 'bad merge base when good and bad are siblings' '
 	git bisect start "$HASH7" HEAD > my_bisect_log.txt &&
 	grep "merge base must be tested" my_bisect_log.txt &&
 	grep $HASH4 my_bisect_log.txt &&
 	test_must_fail git bisect bad > my_bisect_log.txt 2>&1 &&
 	grep "merge base $HASH4 is bad" my_bisect_log.txt &&
 	grep "fixed between $HASH4 and \[$SIDE_HASH7\]" my_bisect_log.txt &&
 	git bisect reset
 '

 # This creates a few more commits (A and B) to test "siblings" cases
 # when a good and a bad rev have many merge bases.
 #
 # We should have the following:
 #
 # H1-H2-H3-H4-H5-H6-H7
 #            \  \     \
 #             S5-A     \
 #              \        \
 #               S6-S7----B
 #
 # And there A and B have 2 merge bases (S5 and H5) that should be
 # reported by "git merge-base --all A B".
 #
 test_expect_success 'many merge bases creation' '
 	git checkout "$SIDE_HASH5" &&
 	git merge -m "merge HASH5 and SIDE_HASH5" "$HASH5" &&
 	A_HASH=$(git rev-parse --verify HEAD) &&
 	git checkout side &&
 	git merge -m "merge HASH7 and SIDE_HASH7" "$HASH7" &&
 	B_HASH=$(git rev-parse --verify HEAD) &&
 	git merge-base --all "$A_HASH" "$B_HASH" > merge_bases.txt &&
 	test $(wc -l < merge_bases.txt) = "2" &&
 	grep "$HASH5" merge_bases.txt &&
 	grep "$SIDE_HASH5" merge_bases.txt
 '

 test_expect_success 'good merge bases when good and bad are siblings' '
 	git bisect start "$B_HASH" "$A_HASH" > my_bisect_log.txt &&
 	grep "merge base must be tested" my_bisect_log.txt &&
 	git bisect good > my_bisect_log2.txt &&
 	grep "merge base must be tested" my_bisect_log2.txt &&
 	{
 		{
 			grep "$SIDE_HASH5" my_bisect_log.txt &&
 			grep "$HASH5" my_bisect_log2.txt
 		} || {
 			grep "$SIDE_HASH5" my_bisect_log2.txt &&
 			grep "$HASH5" my_bisect_log.txt
 		}
 	} &&
 	git bisect reset
 '

 check_trace() {
 	grep "$1" "$GIT_TRACE" | grep "\^$2" | grep "$3" >/dev/null
 }

 test_expect_success 'optimized merge base checks' '
 	GIT_TRACE="$(pwd)/trace.log" &&
 	export GIT_TRACE &&
 	git bisect start "$HASH7" "$SIDE_HASH7" > my_bisect_log.txt &&
 	grep "merge base must be tested" my_bisect_log.txt &&
 	grep "$HASH4" my_bisect_log.txt &&
 	check_trace "rev-list" "$HASH7" "$SIDE_HASH7" &&
 	git bisect good > my_bisect_log2.txt &&
 	test -f ".git/BISECT_ANCESTORS_OK" &&
 	test "$HASH6" = $(git rev-parse --verify HEAD) &&
 	: > "$GIT_TRACE" &&
 	git bisect bad > my_bisect_log3.txt &&
 	test_must_fail check_trace "rev-list" "$HASH6" "$SIDE_HASH7" &&
 	git bisect good "$A_HASH" > my_bisect_log4.txt &&
 	grep "merge base must be tested" my_bisect_log4.txt &&
 	test_must_fail test -f ".git/BISECT_ANCESTORS_OK" &&
 	check_trace "rev-list" "$HASH6" "$A_HASH" &&
 	unset GIT_TRACE
 '

 #
 #
 test_done
	#!/bin/sh
	#
	# Copyright (c) 2007 Christian Couder
	#
	test_description='Tests git bisect functionality'

	exec </dev/null

	. ./test-lib.sh

	add_line_into_file()
	{
	_line=$1
	_file=$2

	if [ -f "$_file" ]; then
	echo "$_line" >> $_file \|\| return $?
	MSG="Add <$_line> into <$_file>."
	else
	echo "$_line" > $_file \|\| return $?
	git add $_file \|\| return $?
	MSG="Create file <$_file> with <$_line> inside."
	fi

	test_tick
	git commit --quiet -m "$MSG" $_file
	}

	HASH1=
	HASH2=
	HASH3=
	HASH4=

	test_expect_success 'set up basic repo with 1 file (hello) and 4 commits' '
	add_line_into_file "1: Hello World" hello &&
	HASH1=$(git rev-parse --verify HEAD) &&
	add_line_into_file "2: A new day for git" hello &&
	HASH2=$(git rev-parse --verify HEAD) &&
	add_line_into_file "3: Another new day for git" hello &&
	HASH3=$(git rev-parse --verify HEAD) &&
	add_line_into_file "4: Ciao for now" hello &&
	HASH4=$(git rev-parse --verify HEAD)
	'

	test_expect_success 'bisect starts with only one bad' '
	git bisect reset &&
	git bisect start &&
	git bisect bad $HASH4 &&
	git bisect next
	'

	test_expect_success 'bisect does not start with only one good' '
	git bisect reset &&
	git bisect start &&
	git bisect good $HASH1 \|\| return 1

	if git bisect next
	then
	echo Oops, should have failed.
	false
	else
	:
	fi
	'

	test_expect_success 'bisect start with one bad and good' '
	git bisect reset &&
	git bisect start &&
	git bisect good $HASH1 &&
	git bisect bad $HASH4 &&
	git bisect next
	'

	test_expect_success 'bisect fails if given any junk instead of revs' '
	git bisect reset &&
	test_must_fail git bisect start foo $HASH1 -- &&
	test_must_fail git bisect start $HASH4 $HASH1 bar -- &&
	test -z "$(git for-each-ref "refs/bisect/*")" &&
	test -z "$(ls .git/BISECT_* 2>/dev/null)" &&
	git bisect start &&
	test_must_fail git bisect good foo $HASH1 &&
	test_must_fail git bisect good $HASH1 bar &&
	test_must_fail git bisect bad frotz &&
	test_must_fail git bisect bad $HASH3 $HASH4 &&
	test_must_fail git bisect skip bar $HASH3 &&
	test_must_fail git bisect skip $HASH1 foo &&
	test -z "$(git for-each-ref "refs/bisect/*")" &&
	git bisect good $HASH1 &&
	git bisect bad $HASH4
	'

	test_expect_success 'bisect reset: back in the master branch' '
	git bisect reset &&
	echo "* master" > branch.expect &&
	git branch > branch.output &&
	cmp branch.expect branch.output
	'

	test_expect_success 'bisect reset: back in another branch' '
	git checkout -b other &&
	git bisect start &&
	git bisect good $HASH1 &&
	git bisect bad $HASH3 &&
	git bisect reset &&
	echo " master" > branch.expect &&
	echo "* other" >> branch.expect &&
	git branch > branch.output &&
	cmp branch.expect branch.output
	'

	test_expect_success 'bisect reset when not bisecting' '
	git bisect reset &&
	git branch > branch.output &&
	cmp branch.expect branch.output
	'

	test_expect_success 'bisect reset removes packed refs' '
	git bisect reset &&
	git bisect start &&
	git bisect good $HASH1 &&
	git bisect bad $HASH3 &&
	git pack-refs --all --prune &&
	git bisect next &&
	git bisect reset &&
	test -z "$(git for-each-ref "refs/bisect/*")" &&
	test -z "$(git for-each-ref "refs/heads/bisect")"
	'

	test_expect_success 'bisect start: back in good branch' '
	git branch > branch.output &&
	grep "* other" branch.output > /dev/null &&
	git bisect start $HASH4 $HASH1 -- &&
	git bisect good &&
	git bisect start $HASH4 $HASH1 -- &&
	git bisect bad &&
	git bisect reset &&
	git branch > branch.output &&
	grep "* other" branch.output > /dev/null
	'

	test_expect_success 'bisect start: no ".git/BISECT_START" if junk rev' '
	git bisect start $HASH4 $HASH1 -- &&
	git bisect good &&
	test_must_fail git bisect start $HASH4 foo -- &&
	git branch > branch.output &&
	grep "* other" branch.output > /dev/null &&
	test_must_fail test -e .git/BISECT_START
	'

	test_expect_success 'bisect start: no ".git/BISECT_START" if mistaken rev' '
	git bisect start $HASH4 $HASH1 -- &&
	git bisect good &&
	test_must_fail git bisect start $HASH1 $HASH4 -- &&
	git branch > branch.output &&
	grep "* other" branch.output > /dev/null &&
	test_must_fail test -e .git/BISECT_START
	'

	test_expect_success 'bisect start: no ".git/BISECT_START" if checkout error' '
	echo "temp stuff" > hello &&
	test_must_fail git bisect start $HASH4 $HASH1 -- &&
	git branch &&
	git branch > branch.output &&
	grep "* other" branch.output > /dev/null &&
	test_must_fail test -e .git/BISECT_START &&
	test -z "$(git for-each-ref "refs/bisect/*")" &&
	git checkout HEAD hello
	'

	# $HASH1 is good, $HASH4 is bad, we skip $HASH3
	# but $HASH2 is bad,
	# so we should find $HASH2 as the first bad commit
	test_expect_success 'bisect skip: successfull result' '
	git bisect reset &&
	git bisect start $HASH4 $HASH1 &&
	git bisect skip &&
	git bisect bad > my_bisect_log.txt &&
	grep "$HASH2 is first bad commit" my_bisect_log.txt &&
	git bisect reset
	'

	# $HASH1 is good, $HASH4 is bad, we skip $HASH3 and $HASH2
	# so we should not be able to tell the first bad commit
	# among $HASH2, $HASH3 and $HASH4
	test_expect_success 'bisect skip: cannot tell between 3 commits' '
	git bisect start $HASH4 $HASH1 &&
	git bisect skip \|\| return 1

	if git bisect skip > my_bisect_log.txt
	then
	echo Oops, should have failed.
	false
	else
	test $? -eq 2 &&
	grep "first bad commit could be any of" my_bisect_log.txt &&
	! grep $HASH1 my_bisect_log.txt &&
	grep $HASH2 my_bisect_log.txt &&
	grep $HASH3 my_bisect_log.txt &&
	grep $HASH4 my_bisect_log.txt &&
	git bisect reset
	fi
	'

	# $HASH1 is good, $HASH4 is bad, we skip $HASH3
	# but $HASH2 is good,
	# so we should not be able to tell the first bad commit
	# among $HASH3 and $HASH4
	test_expect_success 'bisect skip: cannot tell between 2 commits' '
	git bisect start $HASH4 $HASH1 &&
	git bisect skip \|\| return 1

	if git bisect good > my_bisect_log.txt
	then
	echo Oops, should have failed.
	false
	else
	test $? -eq 2 &&
	grep "first bad commit could be any of" my_bisect_log.txt &&
	! grep $HASH1 my_bisect_log.txt &&
	! grep $HASH2 my_bisect_log.txt &&
	grep $HASH3 my_bisect_log.txt &&
	grep $HASH4 my_bisect_log.txt &&
	git bisect reset
	fi
	'

	# $HASH1 is good, $HASH4 is both skipped and bad, we skip $HASH3
	# and $HASH2 is good,
	# so we should not be able to tell the first bad commit
	# among $HASH3 and $HASH4
	test_expect_success 'bisect skip: with commit both bad and skipped' '
	git bisect start &&
	git bisect skip &&
	git bisect bad &&
	git bisect good $HASH1 &&
	git bisect skip &&
	if git bisect good > my_bisect_log.txt
	then
	echo Oops, should have failed.
	false
	else
	test $? -eq 2 &&
	grep "first bad commit could be any of" my_bisect_log.txt &&
	! grep $HASH1 my_bisect_log.txt &&
	! grep $HASH2 my_bisect_log.txt &&
	grep $HASH3 my_bisect_log.txt &&
	grep $HASH4 my_bisect_log.txt &&
	git bisect reset
	fi
	'

	# We want to automatically find the commit that
	# introduced "Another" into hello.
	test_expect_success \
	'"git bisect run" simple case' \
	'echo "#"\!"/bin/sh" > test_script.sh &&
	echo "grep Another hello > /dev/null" >> test_script.sh &&
	echo "test \$? -ne 0" >> test_script.sh &&
	chmod +x test_script.sh &&
	git bisect start &&
	git bisect good $HASH1 &&
	git bisect bad $HASH4 &&
	git bisect run ./test_script.sh > my_bisect_log.txt &&
	grep "$HASH3 is first bad commit" my_bisect_log.txt &&
	git bisect reset'

	# We want to automatically find the commit that
	# introduced "Ciao" into hello.
	test_expect_success \
	'"git bisect run" with more complex "git bisect start"' \
	'echo "#"\!"/bin/sh" > test_script.sh &&
	echo "grep Ciao hello > /dev/null" >> test_script.sh &&
	echo "test \$? -ne 0" >> test_script.sh &&
	chmod +x test_script.sh &&
	git bisect start $HASH4 $HASH1 &&
	git bisect run ./test_script.sh > my_bisect_log.txt &&
	grep "$HASH4 is first bad commit" my_bisect_log.txt &&
	git bisect reset'

	# $HASH1 is good, $HASH5 is bad, we skip $HASH3
	# but $HASH4 is good,
	# so we should find $HASH5 as the first bad commit
	HASH5=
	test_expect_success 'bisect skip: add line and then a new test' '
	add_line_into_file "5: Another new line." hello &&
	HASH5=$(git rev-parse --verify HEAD) &&
	git bisect start $HASH5 $HASH1 &&
	git bisect skip &&
	git bisect good > my_bisect_log.txt &&
	grep "$HASH5 is first bad commit" my_bisect_log.txt &&
	git bisect log > log_to_replay.txt &&
	git bisect reset
	'

	test_expect_success 'bisect skip and bisect replay' '
	git bisect replay log_to_replay.txt > my_bisect_log.txt &&
	grep "$HASH5 is first bad commit" my_bisect_log.txt &&
	git bisect reset
	'

	HASH6=
	test_expect_success 'bisect run & skip: cannot tell between 2' '
	add_line_into_file "6: Yet a line." hello &&
	HASH6=$(git rev-parse --verify HEAD) &&
	echo "#"\!"/bin/sh" > test_script.sh &&
	echo "sed -ne \\\$p hello \| grep Ciao > /dev/null && exit 125" >> test_script.sh &&
	echo "grep line hello > /dev/null" >> test_script.sh &&
	echo "test \$? -ne 0" >> test_script.sh &&
	chmod +x test_script.sh &&
	git bisect start $HASH6 $HASH1 &&
	if git bisect run ./test_script.sh > my_bisect_log.txt
	then
	echo Oops, should have failed.
	false
	else
	test $? -eq 2 &&
	grep "first bad commit could be any of" my_bisect_log.txt &&
	! grep $HASH3 my_bisect_log.txt &&
	! grep $HASH6 my_bisect_log.txt &&
	grep $HASH4 my_bisect_log.txt &&
	grep $HASH5 my_bisect_log.txt
	fi
	'

	HASH7=
	test_expect_success 'bisect run & skip: find first bad' '
	git bisect reset &&
	add_line_into_file "7: Should be the last line." hello &&
	HASH7=$(git rev-parse --verify HEAD) &&
	echo "#"\!"/bin/sh" > test_script.sh &&
	echo "sed -ne \\\$p hello \| grep Ciao > /dev/null && exit 125" >> test_script.sh &&
	echo "sed -ne \\\$p hello \| grep day > /dev/null && exit 125" >> test_script.sh &&
	echo "grep Yet hello > /dev/null" >> test_script.sh &&
	echo "test \$? -ne 0" >> test_script.sh &&
	chmod +x test_script.sh &&
	git bisect start $HASH7 $HASH1 &&
	git bisect run ./test_script.sh > my_bisect_log.txt &&
	grep "$HASH6 is first bad commit" my_bisect_log.txt
	'

	test_expect_success 'bisect skip only one range' '
	git bisect reset &&
	git bisect start $HASH7 $HASH1 &&
	git bisect skip $HASH1..$HASH5 &&
	test "$HASH6" = "$(git rev-parse --verify HEAD)" &&
	test_must_fail git bisect bad > my_bisect_log.txt &&
	grep "first bad commit could be any of" my_bisect_log.txt
	'

	test_expect_success 'bisect skip many ranges' '
	git bisect start $HASH7 $HASH1 &&
	test "$HASH4" = "$(git rev-parse --verify HEAD)" &&
	git bisect skip $HASH2 $HASH2.. ..$HASH5 &&
	test "$HASH6" = "$(git rev-parse --verify HEAD)" &&
	test_must_fail git bisect bad > my_bisect_log.txt &&
	grep "first bad commit could be any of" my_bisect_log.txt
	'

	test_expect_success 'bisect starting with a detached HEAD' '
	git bisect reset &&
	git checkout master^ &&
	HEAD=$(git rev-parse --verify HEAD) &&
	git bisect start &&
	test $HEAD = $(cat .git/BISECT_START) &&
	git bisect reset &&
	test $HEAD = $(git rev-parse --verify HEAD)
	'

	test_expect_success 'bisect errors out if bad and good are mistaken' '
	git bisect reset &&
	test_must_fail git bisect start $HASH2 $HASH4 2> rev_list_error &&
	grep "mistake good and bad" rev_list_error &&
	git bisect reset
	'

	test_expect_success 'bisect does not create a "bisect" branch' '
	git bisect reset &&
	git bisect start $HASH7 $HASH1 &&
	git branch bisect &&
	rev_hash4=$(git rev-parse --verify HEAD) &&
	test "$rev_hash4" = "$HASH4" &&
	git branch -D bisect &&
	git bisect good &&
	git branch bisect &&
	rev_hash6=$(git rev-parse --verify HEAD) &&
	test "$rev_hash6" = "$HASH6" &&
	git bisect good > my_bisect_log.txt &&
	grep "$HASH7 is first bad commit" my_bisect_log.txt &&
	git bisect reset &&
	rev_hash6=$(git rev-parse --verify bisect) &&
	test "$rev_hash6" = "$HASH6" &&
	git branch -D bisect
	'

	# This creates a "side" branch to test "siblings" cases.
	#
	# H1-H2-H3-H4-H5-H6-H7 <--other
	# \
	# S5-S6-S7 <--side
	#
	test_expect_success 'side branch creation' '
	git bisect reset &&
	git checkout -b side $HASH4 &&
	add_line_into_file "5(side): first line on a side branch" hello2 &&
	SIDE_HASH5=$(git rev-parse --verify HEAD) &&
	add_line_into_file "6(side): second line on a side branch" hello2 &&
	SIDE_HASH6=$(git rev-parse --verify HEAD) &&
	add_line_into_file "7(side): third line on a side branch" hello2 &&
	SIDE_HASH7=$(git rev-parse --verify HEAD)
	'

	test_expect_success 'good merge base when good and bad are siblings' '
	git bisect start "$HASH7" "$SIDE_HASH7" > my_bisect_log.txt &&
	grep "merge base must be tested" my_bisect_log.txt &&
	grep $HASH4 my_bisect_log.txt &&
	git bisect good > my_bisect_log.txt &&
	test_must_fail grep "merge base must be tested" my_bisect_log.txt &&
	grep $HASH6 my_bisect_log.txt &&
	git bisect reset
	'
	test_expect_success 'skipped merge base when good and bad are siblings' '
	git bisect start "$SIDE_HASH7" "$HASH7" > my_bisect_log.txt &&
	grep "merge base must be tested" my_bisect_log.txt &&
	grep $HASH4 my_bisect_log.txt &&
	git bisect skip > my_bisect_log.txt 2>&1 &&
	grep "Warning" my_bisect_log.txt &&
	grep $SIDE_HASH6 my_bisect_log.txt &&
	git bisect reset
	'

	test_expect_success 'bad merge base when good and bad are siblings' '
	git bisect start "$HASH7" HEAD > my_bisect_log.txt &&
	grep "merge base must be tested" my_bisect_log.txt &&
	grep $HASH4 my_bisect_log.txt &&
	test_must_fail git bisect bad > my_bisect_log.txt 2>&1 &&
	grep "merge base $HASH4 is bad" my_bisect_log.txt &&
	grep "fixed between $HASH4 and \[$SIDE_HASH7\]" my_bisect_log.txt &&
	git bisect reset
	'

	# This creates a few more commits (A and B) to test "siblings" cases
	# when a good and a bad rev have many merge bases.
	#
	# We should have the following:
	#
	# H1-H2-H3-H4-H5-H6-H7
	# \ \ \
	# S5-A \
	# \ \
	# S6-S7----B
	#
	# And there A and B have 2 merge bases (S5 and H5) that should be
	# reported by "git merge-base --all A B".
	#
	test_expect_success 'many merge bases creation' '
	git checkout "$SIDE_HASH5" &&
	git merge -m "merge HASH5 and SIDE_HASH5" "$HASH5" &&
	A_HASH=$(git rev-parse --verify HEAD) &&
	git checkout side &&
	git merge -m "merge HASH7 and SIDE_HASH7" "$HASH7" &&
	B_HASH=$(git rev-parse --verify HEAD) &&
	git merge-base --all "$A_HASH" "$B_HASH" > merge_bases.txt &&
	test $(wc -l < merge_bases.txt) = "2" &&
	grep "$HASH5" merge_bases.txt &&
	grep "$SIDE_HASH5" merge_bases.txt
	'

	test_expect_success 'good merge bases when good and bad are siblings' '
	git bisect start "$B_HASH" "$A_HASH" > my_bisect_log.txt &&
	grep "merge base must be tested" my_bisect_log.txt &&
	git bisect good > my_bisect_log2.txt &&
	grep "merge base must be tested" my_bisect_log2.txt &&
	{
	{
	grep "$SIDE_HASH5" my_bisect_log.txt &&
	grep "$HASH5" my_bisect_log2.txt
	} \|\| {
	grep "$SIDE_HASH5" my_bisect_log2.txt &&
	grep "$HASH5" my_bisect_log.txt
	}
	} &&
	git bisect reset
	'

	check_trace() {
	grep "$1" "$GIT_TRACE" \| grep "\^$2" \| grep "$3" >/dev/null
	}

	test_expect_success 'optimized merge base checks' '
	GIT_TRACE="$(pwd)/trace.log" &&
	export GIT_TRACE &&
	git bisect start "$HASH7" "$SIDE_HASH7" > my_bisect_log.txt &&
	grep "merge base must be tested" my_bisect_log.txt &&
	grep "$HASH4" my_bisect_log.txt &&
	check_trace "rev-list" "$HASH7" "$SIDE_HASH7" &&
	git bisect good > my_bisect_log2.txt &&
	test -f ".git/BISECT_ANCESTORS_OK" &&
	test "$HASH6" = $(git rev-parse --verify HEAD) &&
	: > "$GIT_TRACE" &&
	git bisect bad > my_bisect_log3.txt &&
	test_must_fail check_trace "rev-list" "$HASH6" "$SIDE_HASH7" &&
	git bisect good "$A_HASH" > my_bisect_log4.txt &&
	grep "merge base must be tested" my_bisect_log4.txt &&
	test_must_fail test -f ".git/BISECT_ANCESTORS_OK" &&
	check_trace "rev-list" "$HASH6" "$A_HASH" &&
	unset GIT_TRACE
	'

	#
	#
	test_done