u-string-list: move "filter string" test to "u-string-list.c"

We use "test-tool string-list filter" to test the "filter_string_list"
function. As we have introduced the unit test, we'd better remove the
logic from shell script to C program to improve test speed and
readability.

Signed-off-by: shejialuo <shejialuo@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

3 files changed, 73 insertions, 32 deletions

diff --git a/t/helper/test-string-list.c b/t/helper/test-string-list.c
index 8a344347ad..262b28c599 100644
--- a/t/helper/test-string-list.c
+++ b/t/helper/test-string-list.c
@@ -31,29 +31,8 @@ static void write_list_compact(const struct string_list *list)
 	}
 }
 
-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);
-}
-
 int cmd__string_list(int argc, const char **argv)
 {
-	if (argc == 4 && !strcmp(argv[1], "filter")) {
-		/*
-		 * Retain only the items that have the specified prefix.
-		 * Arguments: list|- prefix
-		 */
-		struct string_list list = STRING_LIST_INIT_DUP;
-		const char *prefix = argv[3];
-
-		parse_string_list(&list, argv[2]);
-		filter_string_list(&list, 0, prefix_cb, (void *)prefix);
-		write_list_compact(&list);
-		string_list_clear(&list, 0);
-		return 0;
-	}
-
 	if (argc == 3 && !strcmp(argv[1], "remove_duplicates")) {
 		struct string_list list = STRING_LIST_INIT_DUP;
 
diff --git a/t/t0063-string-list.sh b/t/t0063-string-list.sh
index 1a9cf8bfcf..31fd62bba8 100755
--- a/t/t0063-string-list.sh
+++ b/t/t0063-string-list.sh
@@ -7,17 +7,6 @@ test_description='Test string list functionality'
 
 . ./test-lib.sh
 
-test_expect_success "test filter_string_list" '
-	test "x-" = "x$(test-tool string-list filter - y)" &&
-	test "x-" = "x$(test-tool string-list filter no y)" &&
-	test yes = "$(test-tool string-list filter yes y)" &&
-	test yes = "$(test-tool string-list filter no:yes y)" &&
-	test yes = "$(test-tool string-list filter yes:no y)" &&
-	test y1:y2 = "$(test-tool string-list filter y1:y2 y)" &&
-	test y2:y1 = "$(test-tool string-list filter y2:y1 y)" &&
-	test "x-" = "x$(test-tool string-list filter x1:x2 y)"
-'
-
 test_expect_success "test remove_duplicates" '
 	test "x-" = "x$(test-tool string-list remove_duplicates -)" &&
 	test "x" = "x$(test-tool string-list remove_duplicates "")" &&
diff --git a/t/unit-tests/u-string-list.c b/t/unit-tests/u-string-list.c
index d2761e1f2f..f061a3694b 100644
--- a/t/unit-tests/u-string-list.c
+++ b/t/unit-tests/u-string-list.c
@@ -13,6 +13,26 @@ static void t_vcreate_string_list_dup(struct string_list *list,
 		string_list_append(list, arg);
 }
 
+static void t_create_string_list_dup(struct string_list *list, int free_util, ...)
+{
+	va_list ap;
+
+	cl_assert(list->strdup_strings);
+
+	string_list_clear(list, free_util);
+	va_start(ap, free_util);
+	t_vcreate_string_list_dup(list, free_util, ap);
+	va_end(ap);
+}
+
+static void t_string_list_clear(struct string_list *list, int free_util)
+{
+	string_list_clear(list, free_util);
+	cl_assert_equal_p(list->items, NULL);
+	cl_assert_equal_i(list->nr, 0);
+	cl_assert_equal_i(list->alloc, 0);
+}
+
 static void t_string_list_equal(struct string_list *list,
 				struct string_list *expected_strings)
 {
@@ -90,3 +110,56 @@ void test_string_list__split_in_place(void)
 	t_string_list_split_in_place("foo:;:bar:;:", ":;", -1,
 				     "foo", "", "", "bar", "", "", "", NULL);
 }
+
+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, ...)
+{
+	struct string_list expected_strings = STRING_LIST_INIT_DUP;
+	const char *prefix = "y";
+	va_list ap;
+
+	va_start(ap, list);
+	t_vcreate_string_list_dup(&expected_strings, 0, ap);
+	va_end(ap);
+
+	filter_string_list(list, 0, prefix_cb, (void *)prefix);
+	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;
+
+	t_create_string_list_dup(&list, 0, NULL);
+	t_string_list_filter(&list, NULL);
+
+	t_create_string_list_dup(&list, 0, "no", NULL);
+	t_string_list_filter(&list, NULL);
+
+	t_create_string_list_dup(&list, 0, "yes", NULL);
+	t_string_list_filter(&list, "yes", NULL);
+
+	t_create_string_list_dup(&list, 0, "no", "yes", NULL);
+	t_string_list_filter(&list, "yes", NULL);
+
+	t_create_string_list_dup(&list, 0, "yes", "no", NULL);
+	t_string_list_filter(&list, "yes", NULL);
+
+	t_create_string_list_dup(&list, 0, "y1", "y2", NULL);
+	t_string_list_filter(&list, "y1", "y2", NULL);
+
+	t_create_string_list_dup(&list, 0, "y2", "y1", NULL);
+	t_string_list_filter(&list, "y2", "y1", NULL);
+
+	t_create_string_list_dup(&list, 0, "x1", "x2", NULL);
+	t_string_list_filter(&list, NULL);
+
+	t_string_list_clear(&list, 0);
+}