test(common): add unit tests for common and encodes modules

[pengfeixx]

Add tests for Config, Eventlogutils, IflytekAiAssistant, TextFileSaver and detectcode helper functions.

Log: 新增common和encodes模块的单元测试
Influence: 覆盖Config、Eventlogutils等类的未覆盖函数

Summary by Sourcery

Add unit tests to cover previously untested functionality in the common and encodes modules.

Tests:

• Add unit tests for UTF-8 and GB18030 encoding helper functions in the encodes module.
• Add unit tests for IflytekAiAssistant private and singleton behaviors, including DBus-related paths and destructor.
• Add unit tests for Config singleton lifecycle, configuration getters, and value-changed handling.
• Add unit tests for TextFileSaver saveAs success and failure paths.
• Add unit tests for Eventlogutils singleton access and log writing behavior with various JSON inputs.

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Reviewer's Guide

Add new GoogleTest-based unit tests for previously uncovered functionality in the common and encodes modules, targeting private/internal methods and file-scope helper functions via -fno-access-control and direct declarations.

File-Level Changes

Change	Details	Files
Add unit tests for detectcode.cpp file-scope helper functions to validate UTF-8 multi-byte counting and GB18030/UTF-8 error handling paths.	Declare utf8MultiByteCount, checkGB18030ToUtf8Error, and checkUTF8ToGB18030Error as extern functions to access file-scope helpers from detectcode.cpp. Add tests covering ASCII, valid multi-byte prefixes, continuation-byte sequences, and invalid leading bits for utf8MultiByteCount, including the internal lambda path. Add tests for checkGB18030ToUtf8Error that cover short buffers, non-matching 4-byte sequences, and a PUA mapping hit with replacement length and appendChar assertions. Add tests for checkUTF8ToGB18030Error for short buffers, PUA mapping hits from UTF-8 to GB18030, mapping of known 2005 error codes, and non-matching sequences with default replacement behavior.	tests/src/encodes/ut_detectcode_helpers.cpp
Add unit tests for IflytekAiAssistant to exercise private static and instance methods, status transitions, and destructor behavior.	Test launchCopilotChat with a QDBusInterface pointing at the copilot service, asserting the returned CallStatus is one of the known enum values regardless of DBus environment. Test stopTtsDirectlyInternal when the assistant is not enabled, confirming it returns the current status immediately. Force m_status to Enable and verify stopTtsDirectlyInternal follows the DBus success path and returns Success, then restore the previous status. Create and delete a standalone IflytekAiAssistant instance to cover the private defaulted destructor.	tests/src/common/ut_iflytek_ai_assistant.cpp
Add unit tests for Config singleton behavior, constructor/destructor coverage, configuration getters, and the DConfig valueChanged lambda.	Create and delete a Config instance via the private constructor to cover constructor and destructor using -fno-access-control. Verify Config::instance returns a non-null singleton and is stable across repeated calls. Exercise configuration getters such as defaultEncoding to ensure they return non-empty values. Conditionally invoke the DConfig valueChanged signal via QMetaObject on relevant keys to cover the lambda that updates internal state when DConfig is valid.	tests/src/common/ut_config.cpp
Add unit tests for TextFileSaver that cover both successful and failing saveAs paths, including error string handling.	Use a QTextDocument and QTemporaryDir to save content to a real temporary file via saveAs, asserting success and file existence. Set an initial file path, then call saveAs with an unwritable/nonexistent directory path to verify failure, restoration of original path semantics, and a non-empty errorString.	tests/src/common/ut_textfilesaver.cpp
Add unit tests for Eventlogutils singleton and writeLogs behavior with and without payload data.	Verify Eventlogutils::GetInstance returns a singleton instance and that repeated calls return the same pointer. Call writeLogs with a populated QJsonObject containing a StartUp tid and message, confirming the function executes regardless of writeEventLogFunc availability. Call writeLogs with an empty QJsonObject to ensure the early-return path is covered without errors.	tests/src/common/ut_eventlogutils.cpp

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: lzwind, pengfeixx

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