[nrf fromtree] Bluetooth: testlib: Add addr string macro

Adds a macro returning a string representation of a Bluetooth address.
This allows you to print multiple addresses in a single printk or
LOG... call.

Signed-off-by: Håvard Reierstad <[email protected]>
(cherry picked from commit 997814c)

Author: HaavardRei

tests/bluetooth/common/testlib/include/testlib/addr.h

@@ -17,4 +17,18 @@
 		.a = {{last, 0x00, 0x00, 0x00, 0x00, 0xc0}},                                       \
 	})
 
+static inline char *bt_testlib_get_addr_str(const bt_addr_le_t *addr,
+					    char addr_str[BT_ADDR_LE_STR_LEN])
+{
+	bt_addr_le_to_str(addr, addr_str, BT_ADDR_LE_STR_LEN);
+
+	return addr_str;
+}
+
+/** Macro to simplify printing of addresses. The returned pointer is valid until the end of the
+ *  scope this was called from, due to the use of a compound literal.
+ */
+#define bt_testlib_addr_to_str(addr)                                                               \
+	bt_testlib_get_addr_str((addr), (char[BT_ADDR_LE_STR_LEN]) {0})
+
 #endif /* ZEPHYR_TESTS_BLUETOOTH_COMMON_TESTLIB_INCLUDE_TESTLIB_ADDR_H_ */