Re: [PATCH v2 7/8] u-string-list: move "filter string" test to "u-string-list.c"

[Patrick Steinhardt <ps@pks.im>]

On Sun, May 18, 2025 at 11:58:09PM +0800, shejialuo wrote:
> diff --git a/t/unit-tests/u-string-list.c b/t/unit-tests/u-string-list.c
> index e4b8e38fb8..be2bb5f103 100644
> --- a/t/unit-tests/u-string-list.c
> +++ b/t/unit-tests/u-string-list.c
> @@ -103,3 +115,57 @@ void test_string_list__split_in_place(void)
>  
>  	t_string_list_clear(&list, 0);
>  }
> +
> +static int prefix_cb(struct string_list_item *item, void *cb_data)
> +{
> +	const char *prefix = (const char *)cb_data;
> +	return starts_with(item->string, prefix);
> +}
> +
> +static void t_string_list_filter(struct string_list *list,
> +				 string_list_each_func_t want, void *cb_data, ...)
> +{
> +	struct string_list expected_strings = STRING_LIST_INIT_DUP;
> +	va_list ap;
> +
> +	va_start(ap, cb_data);
> +	t_vcreate_string_list_dup(&expected_strings, 0, ap);
> +	va_end(ap);
> +
> +	filter_string_list(list, 0, want, cb_data);
> +	t_string_list_equal(list, &expected_strings);
> +
> +	string_list_clear(&expected_strings, 0);
> +}
> +
> +void test_string_list__filter(void)
> +{
> +	struct string_list list = STRING_LIST_INIT_DUP;
> +	const char *prefix = "y";
> +
> +	t_create_string_list_dup(&list, 0, NULL);

Okay, here we have to manually create a list because you cannot pass two
vararg lists to `t_string_list_filter()`. It's not the prettiest and
feels a bit repetitive, but the alternatives I can think of aren't a lot
nicer, either.

> +	t_string_list_filter(&list, prefix_cb, (void*)prefix, NULL);

Both the `prefix_cb` and `prefix` are the same across all function
calls, so I wondered whether we might want to move them into the
wrapper function directly.

The `void *` casts are also all unnecessary.

Patrick