[libgpiod][PATCH 3/7] tests: event: extend test coverage for reading multiple line events at once

[Bartosz Golaszewski <brgl@xxxxxxxx>]

From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>

Add test cases for new helpers allowing users to read multiple events
at once.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
---
 tests/tests-event.c | 83 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/tests/tests-event.c b/tests/tests-event.c
index d425d1a..1f4a2eb 100644
--- a/tests/tests-event.c
+++ b/tests/tests-event.c
@@ -552,3 +552,86 @@ GPIOD_TEST_CASE(invalid_fd, 0, { 8 })
 	g_assert_cmpint(ret, ==, -1);
 	g_assert_cmpint(errno, ==, EINVAL);
 }
+
+GPIOD_TEST_CASE(read_multiple_events, 0, { 8 })
+{
+	g_autoptr(gpiod_chip_struct) chip = NULL;
+	struct gpiod_line_event events[3];
+	struct timespec ts = { 1, 0 };
+	struct gpiod_line *line;
+	gint ret;
+
+	chip = gpiod_chip_open(gpiod_test_chip_path(0));
+	g_assert_nonnull(chip);
+	gpiod_test_return_if_failed();
+
+	line = gpiod_chip_get_line(chip, 4);
+	g_assert_nonnull(line);
+	gpiod_test_return_if_failed();
+
+	ret = gpiod_line_request_both_edges_events(line, GPIOD_TEST_CONSUMER);
+	g_assert_cmpint(ret, ==, 0);
+
+	gpiod_test_chip_set_pull(0, 4, 1);
+	usleep(10000);
+	gpiod_test_chip_set_pull(0, 4, 0);
+	usleep(10000);
+	gpiod_test_chip_set_pull(0, 4, 1);
+	usleep(10000);
+
+	ret = gpiod_line_event_wait(line, &ts);
+	g_assert_cmpint(ret, ==, 1);
+
+	ret = gpiod_line_event_read_multiple(line, events, 3);
+	g_assert_cmpint(ret, ==, 3);
+
+	g_assert_cmpint(events[0].event_type, ==,
+			GPIOD_LINE_EVENT_RISING_EDGE);
+	g_assert_cmpint(events[1].event_type, ==,
+			GPIOD_LINE_EVENT_FALLING_EDGE);
+	g_assert_cmpint(events[2].event_type, ==,
+			GPIOD_LINE_EVENT_RISING_EDGE);
+}
+
+GPIOD_TEST_CASE(read_multiple_events_fd, 0, { 8 })
+{
+	g_autoptr(gpiod_chip_struct) chip = NULL;
+	struct gpiod_line_event events[3];
+	struct timespec ts = { 1, 0 };
+	struct gpiod_line *line;
+	gint ret, fd;
+
+	chip = gpiod_chip_open(gpiod_test_chip_path(0));
+	g_assert_nonnull(chip);
+	gpiod_test_return_if_failed();
+
+	line = gpiod_chip_get_line(chip, 4);
+	g_assert_nonnull(line);
+	gpiod_test_return_if_failed();
+
+	ret = gpiod_line_request_both_edges_events(line, GPIOD_TEST_CONSUMER);
+	g_assert_cmpint(ret, ==, 0);
+
+	gpiod_test_chip_set_pull(0, 4, 1);
+	usleep(10000);
+	gpiod_test_chip_set_pull(0, 4, 0);
+	usleep(10000);
+	gpiod_test_chip_set_pull(0, 4, 1);
+	usleep(10000);
+
+	ret = gpiod_line_event_wait(line, &ts);
+	g_assert_cmpint(ret, ==, 1);
+
+	fd = gpiod_line_event_get_fd(line);
+	g_assert_cmpint(fd, >=, 0);
+
+	ret = gpiod_line_event_read_fd_multiple(fd, events, 3);
+	g_assert_cmpint(ret, ==, 3);
+
+	g_assert_cmpint(events[0].event_type, ==,
+			GPIOD_LINE_EVENT_RISING_EDGE);
+	g_assert_cmpint(events[1].event_type, ==,
+			GPIOD_LINE_EVENT_FALLING_EDGE);
+	g_assert_cmpint(events[2].event_type, ==,
+			GPIOD_LINE_EVENT_RISING_EDGE);
+}
-- 
2.23.0