tests: Bluetooth: CAP: Initiator unicast start unittests

Adds unittests for the CAP Initiator start procedure, simply
verifying that the procedure works as well as
testing invalid parameters.
This also allows us to remove the invalid behavior checks
from the babblesim test implementation.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>

Author: Thalley

subsys/bluetooth/audio/cap_initiator.c

@@ -978,7 +978,8 @@ void bt_cap_initiator_codec_configured(struct bt_cap_stream *cap_stream)
 		if (free_conn != NULL) {
 			*free_conn = stream_conn;
 		} else {
-			__ASSERT_PRINT("No free conns");
+			__ASSERT(false, "[%zu]: No free conns", i);
+			return;
 		}
 	}
 

tests/bluetooth/audio/cap_initiator/CMakeLists.txt

@@ -14,7 +14,7 @@ target_include_directories(testbinary PRIVATE include)
 
 target_sources(testbinary
   PRIVATE
-    ${ZEPHYR_BASE}/subsys/bluetooth/host/uuid.c
     src/main.c
     src/test_common.c
+    src/test_unicast_start.c
 )

tests/bluetooth/audio/cap_initiator/prj.conf

@@ -3,7 +3,6 @@ CONFIG_LOG=y
 
 CONFIG_BT=y
 CONFIG_BT_CENTRAL=y
-CONFIG_BT_MAX_CONN=2
 CONFIG_BT_AUDIO=y
 
 # Dependencies for CAP initiator unicast
@@ -13,6 +12,13 @@ CONFIG_BT_CSIP_SET_COORDINATOR=y
 CONFIG_BT_CAP_INITIATOR=y
 CONFIG_BT_CAP_INITIATOR_LOG_LEVEL_DBG=y
 
+# Support setting up a sink and source stream on 2 acceptors
+CONFIG_BT_MAX_CONN=2
+CONFIG_BT_ISO_MAX_CHAN=4
+CONFIG_BT_BAP_UNICAST_CLIENT_GROUP_STREAM_COUNT=4
+CONFIG_BT_BAP_UNICAST_CLIENT_ASE_SNK_COUNT=2
+CONFIG_BT_BAP_UNICAST_CLIENT_ASE_SRC_COUNT=2
+
 CONFIG_ASSERT=y
 CONFIG_ASSERT_LEVEL=2
 CONFIG_ASSERT_VERBOSE=y

tests/bluetooth/audio/cap_initiator/src/test_common.c

@@ -6,6 +6,9 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/hci_types.h>
+
 #include "cap_initiator.h"
 #include "conn.h"
 #include "test_common.h"
@@ -24,7 +27,7 @@ void test_conn_init(struct bt_conn *conn)
 {
 	conn->index = 0;
 	conn->info.type = BT_CONN_TYPE_LE;
-	conn->info.role = BT_CONN_ROLE_PERIPHERAL;
+	conn->info.role = BT_CONN_ROLE_CENTRAL;
 	conn->info.state = BT_CONN_STATE_CONNECTED;
 	conn->info.security.level = BT_SECURITY_L2;
 	conn->info.security.enc_key_size = BT_ENC_KEY_SIZE_MAX;