Re: [PATCH v2 23/27] userdiff tests: test hunk header selection with -U0

> The userdiff tests have used a custom -U1 context since
> f12c66b9bb (userdiff/perl: anchor "sub" and "package" patterns on the
> left, 2011-05-21). Changing it to -U0 doesn't change the results for
> any of the tests, except one.
> 
> Let's test for this case explicitly. I.e. that we go "beyond" the
> selected context to find our hunk header. In many cases the desired
> hunk header is part of the diff itself under -U1.

> 
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
> ---
>   t/t4018-diff-funcname.sh | 13 +++++++++++++
>   t/t4018/custom.sh        |  1 +
>   2 files changed, 14 insertions(+)
> 
> diff --git a/t/t4018-diff-funcname.sh b/t/t4018-diff-funcname.sh
> index 8b4500037f..d41aed9ba2 100755
> --- a/t/t4018-diff-funcname.sh
> +++ b/t/t4018-diff-funcname.sh
> @@ -57,6 +57,7 @@ test_diff_funcname () {
>   	cat <&8 >arg.header &&
>   	cat <&9 >arg.test &&
>   	what=$(cat arg.what) &&
> +	arg_diff_U0=$2 &&
>   
>   	test_expect_success "setup: $desc" '
>   		cp arg.test "$what" &&
> @@ -78,6 +79,18 @@ test_diff_funcname () {
>   		test_cmp expected actual
>   	' &&
>   
> +	test_expect_success "$desc -U0" '
> +		git diff -U0 "$what" >diff &&
> +		last_diff_context_line diff >actual &&
> +		if test -n "$arg_diff_U0"
> +		then
> +			echo "$arg_diff_U0" >new-expected &&
> +			test_cmp new-expected actual
> +		else
> +			test_cmp expected actual
> +		fi
> +	' &&
> +
>   	test_expect_success "$desc (accumulated)" '
>   		git diff -U1 "$what".acc >diff &&
>   		last_diff_context_line diff >actual.lines &&
> diff --git a/t/t4018/custom.sh b/t/t4018/custom.sh
> index 886de9cddb..a090f7bfc2 100755
> --- a/t/t4018/custom.sh
> +++ b/t/t4018/custom.sh
> @@ -10,6 +10,7 @@ test_expect_success 'custom: setup non-trivial custom' '
>   '
>   
>   test_diff_funcname 'custom: non-trivial custom pattern' \
> +	'System.out.print(x + " bottles of beer on the wall "' \
>   	8<<\EOF_HUNK 9<<\EOF_TEST
>   int special, RIGHT;
>   EOF_HUNK
>