Subject: [PATCH v3 5/8] u-string-list: move "test_split" into "u-string-list.c"

From: shejialuo <[email-masked]>
Date: Sun, 29 Jun 2025 12:28:14 +0800

We rely on "test-tool string-list" command to test the functionality of
the "string-list". However, as we have introduced clar test framework,
we'd better move the shell script into C program to improve speed and
readability.

Create a new file "u-string-list.c" under "t/unit-tests", then update
the Makefile and "meson.build" to build the file. And let's first move
"test_split" into unit test and gradually convert the shell script into
C program.

In order to create `string_list` easily by simply specifying strings in
the function call, create "t_vcreate_string_list_dup" function to do
this.

Then port the shell script tests to C program and remove unused
"test-tool" code and tests.

Signed-off-by: shejialuo <[email-masked]>
---
 Makefile                     |  1 +
 t/helper/test-string-list.c  | 14 ---------
 t/meson.build                |  1 +
 t/t0063-string-list.sh       | 53 ----------------------------------
 t/unit-tests/u-string-list.c | 55 ++++++++++++++++++++++++++++++++++++
 5 files changed, 57 insertions(+), 67 deletions(-)
 create mode 100644 t/unit-tests/u-string-list.c

diff --git a/Makefile b/Makefile
index 70d1543b6b..744f060e53 100644
--- a/Makefile
+++ b/Makefile
@@ -1367,6 +1367,7 @@ CLAR_TEST_SUITES += u-prio-queue
 CLAR_TEST_SUITES += u-reftable-tree
 CLAR_TEST_SUITES += u-strbuf
 CLAR_TEST_SUITES += u-strcmp-offset
+CLAR_TEST_SUITES += u-string-list
 CLAR_TEST_SUITES += u-strvec
 CLAR_TEST_SUITES += u-trailer
 CLAR_TEST_SUITES += u-urlmatch-normalization
diff --git a/t/helper/test-string-list.c b/t/helper/test-string-list.c
index 6f10c5a435..17c18c30f6 100644
--- a/t/helper/test-string-list.c
+++ b/t/helper/test-string-list.c
@@ -46,20 +46,6 @@ static int prefix_cb(struct string_list_item *item, void *cb_data)
 
 int cmd__string_list(int argc, const char **argv)
 {
-	if (argc == 5 && !strcmp(argv[1], "split")) {
-		struct string_list list = STRING_LIST_INIT_DUP;
-		int i;
-		const char *s = argv[2];
-		int delim = *argv[3];
-		int maxsplit = atoi(argv[4]);
-
-		i = string_list_split(&list, s, delim, maxsplit);
-		printf("%d\n", i);
-		write_list(&list);
-		string_list_clear(&list, 0);
-		return 0;
-	}
-
 	if (argc == 5 && !strcmp(argv[1], "split_in_place")) {
 		struct string_list list = STRING_LIST_INIT_NODUP;
 		int i;
diff --git a/t/meson.build b/t/meson.build
index 50e89e764a..d3b3916580 100644
--- a/t/meson.build
+++ b/t/meson.build
@@ -11,6 +11,7 @@ clar_test_suites = [
   'unit-tests/u-reftable-tree.c',
   'unit-tests/u-strbuf.c',
   'unit-tests/u-strcmp-offset.c',
+  'unit-tests/u-string-list.c',
   'unit-tests/u-strvec.c',
   'unit-tests/u-trailer.c',
   'unit-tests/u-urlmatch-normalization.c',
diff --git a/t/t0063-string-list.sh b/t/t0063-string-list.sh
index aac63ba506..6b20ffd206 100755
--- a/t/t0063-string-list.sh
+++ b/t/t0063-string-list.sh
@@ -7,16 +7,6 @@ test_description='Test string list functionality'
 
 . ./test-lib.sh
 
-test_split () {
-	cat >expected &&
-	test_expect_success "split $1 at $2, max $3" "
-		test-tool string-list split '$1' '$2' '$3' >actual &&
-		test_cmp expected actual &&
-		test-tool string-list split_in_place '$1' '$2' '$3' >actual &&
-		test_cmp expected actual
-	"
-}
-
 test_split_in_place() {
 	cat >expected &&
 	test_expect_success "split (in place) $1 at $2, max $3" "
@@ -25,49 +15,6 @@ test_split_in_place() {
 	"
 }
 
-test_split "foo:bar:baz" ":" "-1" <<EOF
-3
-[0]: "foo"
-[1]: "bar"
-[2]: "baz"
-EOF
-
-test_split "foo:bar:baz" ":" "0" <<EOF
-1
-[0]: "foo:bar:baz"
-EOF
-
-test_split "foo:bar:baz" ":" "1" <<EOF
-2
-[0]: "foo"
-[1]: "bar:baz"
-EOF
-
-test_split "foo:bar:baz" ":" "2" <<EOF
-3
-[0]: "foo"
-[1]: "bar"
-[2]: "baz"
-EOF
-
-test_split "foo:bar:" ":" "-1" <<EOF
-3
-[0]: "foo"
-[1]: "bar"
-[2]: ""
-EOF
-
-test_split "" ":" "-1" <<EOF
-1
-[0]: ""
-EOF
-
-test_split ":" ":" "-1" <<EOF
-2
-[0]: ""
-[1]: ""
-EOF
-
 test_split_in_place "foo:;:bar:;:baz:;:" ":;" "-1" <<EOF
 10
 [0]: "foo"
diff --git a/t/unit-tests/u-string-list.c b/t/unit-tests/u-string-list.c
new file mode 100644
index 0000000000..881720ed6e
--- /dev/null
+++ b/t/unit-tests/u-string-list.c
@@ -0,0 +1,55 @@
+#include "unit-test.h"
+#include "string-list.h"
+
+static void t_vcreate_string_list_dup(struct string_list *list,
+				      int free_util, va_list ap)
+{
+	const char *arg;
+
+	cl_assert(list->strdup_strings);
+
+	string_list_clear(list, free_util);
+	while ((arg = va_arg(ap, const char *)))
+		string_list_append(list, arg);
+}
+
+static void t_string_list_equal(struct string_list *list,
+				struct string_list *expected_strings)
+{
+	cl_assert_equal_i(list->nr, expected_strings->nr);
+	cl_assert(list->nr <= list->alloc);
+	for (size_t i = 0; i < expected_strings->nr; i++)
+		cl_assert_equal_s(list->items[i].string,
+				  expected_strings->items[i].string);
+}
+
+static void t_string_list_split(const char *data, int delim, int maxsplit, ...)
+{
+	struct string_list expected_strings = STRING_LIST_INIT_DUP;
+	struct string_list list = STRING_LIST_INIT_DUP;
+	va_list ap;
+	int len;
+
+	va_start(ap, maxsplit);
+	t_vcreate_string_list_dup(&expected_strings, 0, ap);
+	va_end(ap);
+
+	string_list_clear(&list, 0);
+	len = string_list_split(&list, data, delim, maxsplit);
+	cl_assert_equal_i(len, expected_strings.nr);
+	t_string_list_equal(&list, &expected_strings);
+
+	string_list_clear(&expected_strings, 0);
+	string_list_clear(&list, 0);
+}
+
+void test_string_list__split(void)
+{
+	t_string_list_split("foo:bar:baz", ':', -1, "foo", "bar", "baz", NULL);
+	t_string_list_split("foo:bar:baz", ':', 0, "foo:bar:baz", NULL);
+	t_string_list_split("foo:bar:baz", ':', 1, "foo", "bar:baz", NULL);
+	t_string_list_split("foo:bar:baz", ':', 2, "foo", "bar", "baz", NULL);
+	t_string_list_split("foo:bar:", ':', -1, "foo", "bar", "", NULL);
+	t_string_list_split("", ':', -1, "", NULL);
+	t_string_list_split(":", ':', -1, "", "", NULL);
+}
-- 
2.50.0