tests: Bluetooth: ISO: Add err test for bt_iso_cig_terminate

Add additional check in iso_disconnected to verify that
bt_iso_cig_terminate will fail if we have connected CIS.

Signed-off-by: Emil Gydesen <[email protected]>

Author: Thalley

tests/bsim/bluetooth/host/iso/cis/src/cis_central.c

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <errno.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ -30,6 +31,7 @@
 
 extern enum bst_result_t bst_result;
 static struct bt_iso_chan iso_chans[CONFIG_BT_ISO_MAX_CHAN];
+static size_t connected_channels;
 static struct bt_iso_chan *default_chan = &iso_chans[0];
 static struct bt_iso_cig *cig;
 static uint16_t seq_num;
@@ -129,6 +131,8 @@ static void iso_connected(struct bt_iso_chan *chan)
 	seq_num = 0U;
 	enqueue_cnt = ENQUEUE_COUNT;
 
+	connected_channels++;
+
 	if (chan == default_chan) {
 		/* Start send timer */
 		k_work_schedule(&iso_send_work, K_MSEC(0));
@@ -146,6 +150,10 @@ static void iso_disconnected(struct bt_iso_chan *chan, uint8_t reason)
 
 	printk("ISO Channel %p disconnected (reason 0x%02x)\n", chan, reason);
 
+	TEST_ASSERT(connected_channels > 0U, "Unexpected connected_channels: %zu",
+		    connected_channels);
+	connected_channels--;
+
 	if (chan == default_chan) {
 		k_work_cancel_delayable(&iso_send_work);
 
@@ -159,6 +167,14 @@ static void iso_disconnected(struct bt_iso_chan *chan, uint8_t reason)
 		printk("Channel disconnected early, bumping seq_num to 1000 to end test\n");
 		seq_num = 1000;
 	}
+
+	if (connected_channels >= 1U) {
+		/* Test if bt_iso_cig_terminate correctly fails when there are CIS connected */
+		err = bt_iso_cig_terminate(cig);
+		if (err != EINVAL) {
+			TEST_FAIL("Unexpected success for terminate CIG");
+		}
+	}
 }
 
 static void sdu_sent_cb(struct bt_iso_chan *chan)