diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 0630788608..246457ec2e 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -96,28 +96,6 @@ static char *resolve_relative_url(const char *rel_url, const char *up_path, int
 	return resolved_url;
 }
 
-static int resolve_relative_url_test(int argc, const char **argv, const char *prefix)
-{
-	char *remoteurl, *res;
-	const char *up_path, *url;
-
-	if (argc != 4)
-		die("resolve-relative-url-test only accepts three arguments: <up_path> <remoteurl> <url>");
-
-	up_path = argv[1];
-	remoteurl = xstrdup(argv[2]);
-	url = argv[3];
-
-	if (!strcmp(up_path, "(null)"))
-		up_path = NULL;
-
-	res = relative_url(remoteurl, url, up_path);
-	puts(res);
-	free(res);
-	free(remoteurl);
-	return 0;
-}
-
 /* the result should be freed by the caller. */
 static char *get_submodule_displaypath(const char *path, const char *prefix)
 {
@@ -3273,7 +3251,6 @@ static struct cmd_struct commands[] = {
 	{"clone", module_clone, SUPPORT_SUPER_PREFIX},
 	{"add", module_add, 0},
 	{"update", module_update, SUPPORT_SUPER_PREFIX},
-	{"resolve-relative-url-test", resolve_relative_url_test, 0},
 	{"foreach", module_foreach, SUPPORT_SUPER_PREFIX},
 	{"init", module_init, 0},
 	{"status", module_status, SUPPORT_SUPER_PREFIX},
diff --git a/t/helper/test-submodule.c b/t/helper/test-submodule.c
index 9f0eb44019..e0e0c53d38 100644
--- a/t/helper/test-submodule.c
+++ b/t/helper/test-submodule.c
@@ -2,6 +2,7 @@
 #include "test-tool-utils.h"
 #include "cache.h"
 #include "parse-options.h"
+#include "remote.h"
 #include "submodule-config.h"
 #include "submodule.h"
 
@@ -19,9 +20,17 @@ static const char *submodule_is_active_usage[] = {
 	NULL
 };
 
+#define TEST_TOOL_RESOLVE_RELATIVE_URL_USAGE \
+	"test-tool submodule resolve-relative-url <up_path> <remoteurl> <url>"
+static const char *submodule_resolve_relative_url_usage[] = {
+	TEST_TOOL_RESOLVE_RELATIVE_URL_USAGE,
+	NULL,
+};
+
 static const char *submodule_usage[] = {
 	TEST_TOOL_CHECK_NAME_USAGE,
 	TEST_TOOL_IS_ACTIVE_USAGE,
+	TEST_TOOL_RESOLVE_RELATIVE_URL_USAGE,
 	NULL
 };
 
@@ -76,9 +85,42 @@ static int cmd__submodule_is_active(int argc, const char **argv)
 	return !is_submodule_active(the_repository, argv[0]);
 }
 
+static int resolve_relative_url(int argc, const char **argv)
+{
+	char *remoteurl, *res;
+	const char *up_path, *url;
+
+	up_path = argv[0];
+	remoteurl = xstrdup(argv[1]);
+	url = argv[2];
+
+	if (!strcmp(up_path, "(null)"))
+		up_path = NULL;
+
+	res = relative_url(remoteurl, url, up_path);
+	puts(res);
+	free(res);
+	free(remoteurl);
+	return 0;
+}
+
+static int cmd__submodule_resolve_relative_url(int argc, const char **argv)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+	argc = parse_options(argc, argv, "test-tools", options,
+			     submodule_resolve_relative_url_usage, 0);
+	if (argc != 3)
+		usage_with_options(submodule_resolve_relative_url_usage, options);
+
+	return resolve_relative_url(argc, argv);
+}
+
 static struct test_cmd cmds[] = {
 	{ "check-name", cmd__submodule_check_name },
 	{ "is-active", cmd__submodule_is_active },
+	{ "resolve-relative-url", cmd__submodule_resolve_relative_url},
 };
 
 int cmd__submodule(int argc, const char **argv)
diff --git a/t/t0060-path-utils.sh b/t/t0060-path-utils.sh
index 1f2007e62b..68e29c904a 100755
--- a/t/t0060-path-utils.sh
+++ b/t/t0060-path-utils.sh
@@ -22,7 +22,7 @@ relative_path() {
 
 test_submodule_relative_url() {
 	test_expect_success "test_submodule_relative_url: $1 $2 $3 => $4" "
-		actual=\$(git submodule--helper resolve-relative-url-test '$1' '$2' '$3') &&
+		actual=\$(test-tool submodule resolve-relative-url '$1' '$2' '$3') &&
 		test \"\$actual\" = '$4'
 	"
 }