tests: bluetooth: addr: Cover bt_addr_le_is_resolved() and copy_resolved()

Add a ZTEST suite for the two internal helpers that translate the
address types found in HCI LE events:

  - bt_addr_le_is_resolved() is true for the two identity types only,
    and false for public, random and the anonymous and unresolved
    sentinels
  - bt_addr_le_copy_resolved() maps an identity type to its base type
    and keeps the address bytes

Assisted-by: Claude:claude-fable-5-1
Signed-off-by: Johan Hedberg <johan.hedberg@silabs.com>

Author: jhedberg

tests/bluetooth/addr/CMakeLists.txt

@@ -13,4 +13,5 @@ target_sources(app PRIVATE
   src/test_bt_addr_le_eq.c
   src/test_bt_addr_from_str.c
   src/test_bt_addr_le_resolve.c
+  src/test_bt_addr_le_is_resolved.c
 )

tests/bluetooth/addr/src/test_bt_addr_le_is_resolved.c

@@ -0,0 +1,64 @@
+/* Copyright (c) 2026 Silicon Laboratories Inc.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/bluetooth/addr.h>
+#include <zephyr/ztest.h>
+
+#include <host/addr_internal.h>
+
+ZTEST_SUITE(bt_addr_le_is_resolved, NULL, NULL, NULL, NULL, NULL);
+
+static const bt_addr_t example = { { 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 } };
+
+static ZTEST(bt_addr_le_is_resolved, test_identity_types_are_resolved)
+{
+	bt_addr_le_t a = { .a = example };
+
+	a.type = BT_ADDR_LE_PUBLIC_ID;
+	zassert_true(bt_addr_le_is_resolved(&a));
+
+	a.type = BT_ADDR_LE_RANDOM_ID;
+	zassert_true(bt_addr_le_is_resolved(&a));
+}
+
+static ZTEST(bt_addr_le_is_resolved, test_plain_types_are_not_resolved)
+{
+	bt_addr_le_t a = { .a = example };
+
+	a.type = BT_ADDR_LE_PUBLIC;
+	zassert_false(bt_addr_le_is_resolved(&a));
+
+	a.type = BT_ADDR_LE_RANDOM;
+	zassert_false(bt_addr_le_is_resolved(&a));
+}
+
+static ZTEST(bt_addr_le_is_resolved, test_sentinels_are_not_resolved)
+{
+	/* The LE Extended Advertising Report sentinels have bit 1 set as well,
+	 * but neither is a Controller-resolved identity address.
+	 */
+	bt_addr_le_t a = { .a = example };
+
+	a.type = BT_ADDR_LE_UNRESOLVED;
+	zassert_false(bt_addr_le_is_resolved(&a));
+
+	a.type = BT_ADDR_LE_ANONYMOUS;
+	zassert_false(bt_addr_le_is_resolved(&a));
+}
+
+static ZTEST(bt_addr_le_is_resolved, test_copy_resolved_yields_base_type)
+{
+	bt_addr_le_t src = { .a = example };
+	bt_addr_le_t dst;
+
+	src.type = BT_ADDR_LE_PUBLIC_ID;
+	bt_addr_le_copy_resolved(&dst, &src);
+	zassert_equal(dst.type, BT_ADDR_LE_PUBLIC);
+	zassert_true(bt_addr_eq(&dst.a, &example));
+
+	src.type = BT_ADDR_LE_RANDOM_ID;
+	bt_addr_le_copy_resolved(&dst, &src);
+	zassert_equal(dst.type, BT_ADDR_LE_RANDOM);
+	zassert_true(bt_addr_eq(&dst.a, &example));
+}