Re: [PATCH v3] t4150: fix broken test for am --scissors

> Tests for "git am --[no-]scissors" [1] work in the following way:
>
>  1. Create files with commit messages
>  2. Use these files to create expected commits
>  3. Generate eml file with patch from expected commits
>  4. Create commits using git am with these eml files
>  5. Compare these commits with expected
>
> The test for "git am --scissors" is supposed to take an e-mail with a
> scissors line and in-body "Subject:" header and demonstrate that the
> subject line from the e-mail itself is overridden by the in-body header
> and that only text below the scissors line is included in the commit
> message of the commit created by the invocation of "git am --scissors".
> However, the setup of the test incorrectly uses a commit without the
> scissors line and without the in-body header in the commit message,
> producing eml file not suitable for testing of "git am --scissors".
>
> This can be checked by intentionally breaking is_scissors_line function
> in mailinfo.c, for example, by changing string ">8", which is used by
> the test. With such change the test should fail, but does not.
>
> Fix broken test by generating eml file with scissors line and in-body
> header "Subject:". Since the two tests for --scissors and --no-scissors
> options are there to test cutting or keeping the commit message, update
> both tests to change the test file in the same way, which allows us to
> generate only one eml file to be passed to git am. To clarify the
> intention of the test, give files and tags more explicit names.
>
> [1]: introduced in bf72ac17d (t4150: tests for am --[no-]scissors,
>      2015-07-19)
>
> Signed-off-by: Andrei Rybak <rybak.a.v@gmail.com>
> ---
>
> Applies on top of 980a3d3dd (Merge branch 'pt/am-tests', 2015-08-03).
> This patch is also available at
>
>   https://github.com/rybak/git fix-am-scissors-test-v3
>
> Only changes since v2 are more clear tag names.

>  t/t4150-am.sh | 39 ++++++++++++++++++++-------------------
>  1 file changed, 20 insertions(+), 19 deletions(-)
>
> diff --git a/t/t4150-am.sh b/t/t4150-am.sh
> index e9b6f8158..a821dfda5 100755
> --- a/t/t4150-am.sh
> +++ b/t/t4150-am.sh
> @@ -67,13 +67,15 @@ test_expect_success 'setup: messages' '
>  
>  	EOF
>  
> -	cat >scissors-msg <<-\EOF &&
> -	Test git-am with scissors line
> +	cat >msg-without-scissors-line <<-\EOF &&
> +	Test that git-am --scissors cuts at the scissors line
>  
>  	This line should be included in the commit message.
>  	EOF
>  
> -	cat - scissors-msg >no-scissors-msg <<-\EOF &&
> +	printf "Subject: " >subject-prefix &&
> +
> +	cat - subject-prefix msg-without-scissors-line >msg-with-scissors-line <<-\EOF &&
>  	This line should not be included in the commit message with --scissors enabled.
>  
>  	 - - >8 - - remove everything above this line - - >8 - -
> @@ -150,18 +152,17 @@ test_expect_success setup '
>  	} >patch1-hg.eml &&
>  
>  
> -	echo scissors-file >scissors-file &&
> -	git add scissors-file &&
> -	git commit -F scissors-msg &&
> -	git tag scissors &&
> -	git format-patch --stdout scissors^ >scissors-patch.eml &&
> +	echo file >file &&
> +	git add file &&
> +	git commit -F msg-without-scissors-line &&
> +	git tag expected-for-scissors &&
>  	git reset --hard HEAD^ &&
>  
> -	echo no-scissors-file >no-scissors-file &&
> -	git add no-scissors-file &&
> -	git commit -F no-scissors-msg &&
> -	git tag no-scissors &&
> -	git format-patch --stdout no-scissors^ >no-scissors-patch.eml &&
> +	echo file >file &&
> +	git add file &&
> +	git commit -F msg-with-scissors-line &&
> +	git tag expected-for-no-scissors &&
> +	git format-patch --stdout expected-for-no-scissors^ >patch-with-scissors-line.eml &&
>  	git reset --hard HEAD^ &&
>  
>  	sed -n -e "3,\$p" msg >file &&
> @@ -418,10 +419,10 @@ test_expect_success 'am --scissors cuts the message at the scissors line' '
>  	rm -fr .git/rebase-apply &&
>  	git reset --hard &&
>  	git checkout second &&
> -	git am --scissors scissors-patch.eml &&
> +	git am --scissors patch-with-scissors-line.eml &&
>  	test_path_is_missing .git/rebase-apply &&
> -	git diff --exit-code scissors &&
> -	test_cmp_rev scissors HEAD
> +	git diff --exit-code expected-for-scissors &&
> +	test_cmp_rev expected-for-scissors HEAD
>  '
>  
>  test_expect_success 'am --no-scissors overrides mailinfo.scissors' '
> @@ -429,10 +430,10 @@ test_expect_success 'am --no-scissors overrides mailinfo.scissors' '
>  	git reset --hard &&
>  	git checkout second &&
>  	test_config mailinfo.scissors true &&
> -	git am --no-scissors no-scissors-patch.eml &&
> +	git am --no-scissors patch-with-scissors-line.eml &&
>  	test_path_is_missing .git/rebase-apply &&
> -	git diff --exit-code no-scissors &&
> -	test_cmp_rev no-scissors HEAD
> +	git diff --exit-code expected-for-no-scissors &&
> +	test_cmp_rev expected-for-no-scissors HEAD
>  '
>  
>  test_expect_success 'setup: new author and committer' '