Re: [PATCH v5 2/4] format-patch: add '--base' option to record base tree info

>Xiaolong Ye <xiaolong.ye@intel.com> writes:
>
>> +test_expect_success 'format-patch --base' '
>> +	git checkout side &&
>> +	git format-patch --stdout --base=HEAD~~~ -1 >patch &&
>> +	grep -e "^base-commit:" -A3 patch >actual &&
>
>The -A3 is GNUism.  To do this portably, perhaps you can do
>
>	sed -n -e "/^base-commit:/,+3p"
>
>or something like that.
>
>But more importantly, grabbing 3 lines (and always 3 lines) will not
>catch a future bug that somebody else may introduce to this code
>that shows extra "prerequisite-patch-id:" after them.

>
>> +	echo "base-commit: $(git rev-parse HEAD~~~)" >expected &&
>> +	echo "prerequisite-patch-id: $(git show --patch HEAD~~ | git patch-id --stable | awk "{print \$1}")" >>expected &&
>> +	echo "prerequisite-patch-id: $(git show --patch HEAD~ | git patch-id --stable | awk "{print \$1}")" >>expected &&
>> +	test_cmp expected actual
>> +'