tests: add a test case for busy lines

Run a scenario in which we try to request a line twice and verify that
the second attempt fails.

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>

diff --git a/tests/unit/tests-line.c b/tests/unit/tests-line.c
index 8ab4c1b95ce9537be1561e7cc33657b94795be24..a6b002655718941311e47f3327bb82b6da7d0579 100644 (file)
--- a/tests/unit/tests-line.c
+++ b/tests/unit/tests-line.c
@@ -40,6 +40,29 @@ GU_DEFINE_TEST(line_request_output,
               "gpiod_line_request_output() - good",
               GU_LINES_UNNAMED, { 8 });
 
+static void line_request_already_requested(void)
+{
+       GU_CLEANUP(gu_close_chip) struct gpiod_chip *chip = NULL;
+       struct gpiod_line *line;
+       int status;
+
+       chip = gpiod_chip_open(gu_chip_path(0));
+       GU_ASSERT_NOT_NULL(chip);
+
+       line = gpiod_chip_get_line(chip, 0);
+       GU_ASSERT_NOT_NULL(line);
+
+       status = gpiod_line_request_input(line, "gpiod-unit", false);
+       GU_ASSERT_RET_OK(status);
+
+       status = gpiod_line_request_input(line, "gpiod-unit", false);
+       GU_ASSERT_NOTEQ(status, 0);
+       GU_ASSERT_EQ(gpiod_errno(), GPIOD_ELINEBUSY);
+}
+GU_DEFINE_TEST(line_request_already_requested,
+              "gpiod_line_request() - already requested",
+              GU_LINES_UNNAMED, { 8 });
+
 static void line_request_bulk_output(void)
 {
        GU_CLEANUP(gu_close_chip) struct gpiod_chip *chipA = NULL;