tests: drivers: can: api: Add negative test for can_send()

Check error codes when sending invalid frames:
- too big data payload;
- wrong set of flags.

Signed-off-by: Sebastian Głąb <[email protected]>

Author: nordic-segl

tests/drivers/can/api/src/canfd.c

@@ -238,6 +238,45 @@ ZTEST(canfd, test_canfd_get_capabilities)
 			  "CAN FD loopback mode not supported");
 }
 
+/**
+ * @brief Test sending CAN FD frame with too big payload.
+ */
+ZTEST(canfd, test_send_fd_dlc_out_of_range)
+{
+	struct can_frame frame = {
+		.flags = CAN_FRAME_FDF | CAN_FRAME_BRS,
+		.id = TEST_CAN_STD_ID_1,
+		.dlc = CANFD_MAX_DLC + 1U,
+	};
+	int err;
+
+	Z_TEST_SKIP_IFNDEF(CONFIG_RUNTIME_ERROR_CHECKS);
+
+	err = can_send(can_dev, &frame, TEST_SEND_TIMEOUT, NULL, NULL);
+	zassert_equal(err, -EINVAL, "wrong error on sending invalid frame (err %d)", err);
+}
+
+/**
+ * @brief Test error when CAN FD Error State Indicator (ESI) is send without FD format flag (FDF).
+ *
+ * CAN FD Error State Indicator (ESI) indicates that the transmitting node is
+ * in error-passive state. Only valid in combination with CAN_FRAME_FDF.
+ */
+ZTEST(canfd, test_send_fd_incorrect_esi)
+{
+	struct can_frame frame = {
+		.flags = CAN_FRAME_ESI,
+		.id = TEST_CAN_STD_ID_1,
+		.dlc = 0,
+	};
+	int err;
+
+	Z_TEST_SKIP_IFNDEF(CONFIG_RUNTIME_ERROR_CHECKS);
+
+	err = can_send(can_dev, &frame, TEST_SEND_TIMEOUT, NULL, NULL);
+	zassert_equal(err, -ENOTSUP, "wrong error on sending invalid frame (err %d)", err);
+}
+
 /**
  * @brief Test send/receive with standard (11-bit) CAN IDs and classic CAN frames.
  */

tests/drivers/can/api/src/classic.c

@@ -856,6 +856,33 @@ ZTEST(can_classic, test_send_ext_id_out_of_range)
 	send_invalid_frame(can_dev, &frame);
 }
 
+/**
+ * @brief Test sending standard (11-bit ID) CAN frame with too big payload.
+ */
+ZTEST(can_classic, test_send_std_id_dlc_of_range)
+{
+	struct can_frame frame = {
+		.id = TEST_CAN_STD_ID_1,
+		.dlc = CAN_MAX_DLC + 1U,
+	};
+
+	send_invalid_frame(can_dev, &frame);
+}
+
+/**
+ * @brief Test sending extended (29-bit ID) CAN frame with too big payload.
+ */
+ZTEST(can_classic, test_send_ext_id_dlc_of_range)
+{
+	struct can_frame frame = {
+		.flags = CAN_FRAME_IDE,
+		.id = TEST_CAN_EXT_ID_1,
+		.dlc = CAN_MAX_DLC + 1U,
+	};
+
+	send_invalid_frame(can_dev, &frame);
+}
+
 /**
  * @brief Test send/receive with standard (11-bit) CAN IDs.
  */