[PATCH 4/5] u-string-list: move "filter string" test to "u-string-list.c"

[shejialuo <shejialuo@gmail.com>]

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>
---
 t/helper/test-string-list.c  | 21 ---------------
 t/t0063-string-list.sh       | 11 --------
 t/unit-tests/u-string-list.c | 51 ++++++++++++++++++++++++++++++++++++
 3 files changed, 51 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 44ec8de3d0..e02a15ac04 100644
--- a/t/unit-tests/u-string-list.c
+++ b/t/unit-tests/u-string-list.c
@@ -123,3 +123,54 @@ void test_string_list__split_in_place(void)
 
 	t_string_list_clear(&expected_strings, 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)
+{
+	filter_string_list(list, 0, want, cb_data);
+	t_check_string_list(list, expected_strings);
+}
+
+void test_string_list__filter(void)
+{
+	struct string_list expected_strings = STRING_LIST_INIT_DUP;
+	struct string_list list = STRING_LIST_INIT_DUP;
+	const char *prefix = "y";
+
+	t_string_list_filter(&list, prefix_cb, (void*)prefix, &expected_strings);
+
+	t_create_string_list_dup(&list, 0, "no", NULL);
+	t_string_list_filter(&list, prefix_cb, (void*)prefix, &expected_strings);
+
+	t_create_string_list_dup(&list, 0, "yes", NULL);
+	t_create_string_list_dup(&expected_strings, 0, "yes", NULL);
+	t_string_list_filter(&list, prefix_cb, (void*)prefix, &expected_strings);
+
+	t_create_string_list_dup(&list, 0, "no", "yes", NULL);
+	t_string_list_filter(&list, prefix_cb, (void*)prefix, &expected_strings);
+
+	t_create_string_list_dup(&list, 0, "yes", "no", NULL);
+	t_string_list_filter(&list, prefix_cb, (void*)prefix, &expected_strings);
+
+	t_create_string_list_dup(&list, 0, "y1", "y2", NULL);
+	t_create_string_list_dup(&expected_strings, 0, "y1", "y2", NULL);
+	t_string_list_filter(&list, prefix_cb, (void*)prefix, &expected_strings);
+
+	t_create_string_list_dup(&list, 0, "y2", "y1", NULL);
+	t_create_string_list_dup(&expected_strings, 0, "y2", "y1", NULL);
+	t_string_list_filter(&list, prefix_cb, (void*)prefix, &expected_strings);
+
+	t_create_string_list_dup(&list, 0, "x1", "x2", NULL);
+	t_create_string_list_dup(&expected_strings, 0, NULL);
+	t_string_list_filter(&list, prefix_cb, (void*)prefix, &expected_strings);
+
+	t_string_list_clear(&list, 0);
+	t_string_list_clear(&expected_strings, 0);
+}
-- 
2.49.0