Bluetooth: Test: add unit tests for bt_str_to_uuid function

Add comprehensive unit tests for the new bt_str_to_uuid function to ensure proper conversion of string representations to Bluetooth UUID structures. Tests cover: - 16-bit UUID string conversion (e.g., "180d") - 32-bit UUID string conversion (e.g., "abcdef12") - 128-bit UUID string conversion with standard format - Invalid input cases (malformed strings, empty strings, wrong lengths) Includes proper validation of converted UUID values against expected results using bt_uuid_cmp(). Signed-off-by: Kai Cheng <chengkai@xiaomi.com>

Author: chengkai15

tests/bluetooth/uuid/src/test_bt_uuid_from_str.c

@@ -0,0 +1,64 @@
+/* Copyright (c) 2025 Xiaomi Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdint.h>
+#include <zephyr/ztest.h>
+#include <zephyr/bluetooth/uuid.h>
+
+ZTEST_SUITE(bt_uuid_from_str, NULL, NULL, NULL, NULL, NULL);
+
+ZTEST(bt_uuid_from_str, test_uuid_from_str_16)
+{
+struct bt_uuid_16 uuid = {0};
+int ret;
+
+ret = bt_uuid_from_str(&uuid.uuid, "180d");
+zassert_true(ret == 0, "Failed to parse 16-bit UUID");
+zassert_true(bt_uuid_cmp(&uuid.uuid, BT_UUID_DECLARE_16(0x180d)) == 0,
+ "Parsed UUID does not match expected 16-bit UUID");
+}
+
+ZTEST(bt_uuid_from_str, test_uuid_from_str_32)
+{
+struct bt_uuid_32 uuid = {0};
+int ret;
+
+ret = bt_uuid_from_str(&uuid.uuid, "abcdef12");
+zassert_true(ret == 0, "Failed to parse 32-bit UUID");
+zassert_true(bt_uuid_cmp(&uuid.uuid, BT_UUID_DECLARE_32(0xabcdef12)) == 0,
+ "Parsed UUID does not match expected 32-bit UUID");
+}
+
+ZTEST(bt_uuid_from_str, test_uuid_from_str_128)
+{
+struct bt_uuid_128 uuid = {0};
+int ret;
+
+ret = bt_uuid_from_str(&uuid.uuid, "00001101-0000-1000-8000-00805f9b34fb");
+zassert_true(ret == 0, "Failed to parse 128-bit UUID");
+struct bt_uuid_128 expected =
+BT_UUID_INIT_128(0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80, 0x00, 0x10, 0x00,
+ 0x00, 0x01, 0x11, 0x00, 0x00);
+zassert_true(bt_uuid_cmp(&uuid.uuid, &expected.uuid) == 0,
+ "Parsed UUID does not match expected 128-bit UUID");
+}
+
+ZTEST(bt_uuid_from_str, test_uuid_from_str_invalid)
+{
+struct bt_uuid_128 uuid = {0};
+int ret;
+
+ret = bt_uuid_from_str(&uuid.uuid, "not-a-uuid");
+zassert_true(ret < 0, "Invalid UUID string should fail");
+
+ret = bt_uuid_from_str(&uuid.uuid, "");
+zassert_true(ret < 0, "Empty string should fail");
+
+ret = bt_uuid_from_str(&uuid.uuid, "123");
+zassert_true(ret < 0, "Too short string should fail");
+
+ret = bt_uuid_from_str(&uuid.uuid, "00001101-0000-1000-8000-00805f9b34fb00");
+zassert_true(ret < 0, "Too long 128-bit string should fail");
+}