test(dconfig): add unit tests for dconfig-center

[MyLeeJiEun]

Summary

补充 dde-app-services dconfig-center 单元测试代码，提升测试覆盖率。

Multica Issue: DDE-207

Changes

• 新增 ut_dconfig_global.cpp — 全局工具函数测试（formatDBusObjectPath / getUserNameByUid 等）
• 新增 ut_helper.cpp — 缓存管理器及辅助函数测试（ConfigSyncRequestCache / RefManager 等）
• 扩展 ut_dconfigconn.cpp — 新增 8 个测试用例，修复 save 断言路径匹配问题
• 扩展 ut_dconfigserver.cpp — 新增 9 个测试用例，修复 reload_withFileChange 路径解析
• 改进 test_helper.hpp — 新增 MetaFileGuard RAII，EnvGuard 改用 rmpath 递归清理
• 更新 CMakeLists.txt — ENABLE_COVERAGE 选项条件控制覆盖率，新增测试源文件

Test Results

• 202 passed / 0 failed / 6 skipped
• Coverage: 行 86.3% / 函数 96.9%（均 > 80%）

License

文件头版权声明年份已更新为 2026。

Summary by Sourcery

Expand dconfig-center unit-test coverage and improve test infrastructure for reliable isolation and coverage reporting.

Enhancements:

• Expand dconfig-center unit-test coverage across global utilities, helpers, connections, resources, and server behavior.
• Improve test isolation and cleanup with environment and metadata RAII guards and process-specific temporary paths.

Build:

• Make coverage instrumentation opt-in through ENABLE_COVERAGE and add a coverage report target.

Tests:

• Add comprehensive unit tests for dconfig-center utility functions, cache helpers, connection behavior, resource lifecycle, configuration reparsing, synchronization, and server operations.
• Update existing connection and server tests to cover additional branches, persistence, reload behavior, permission changes, and user-data removal.

Chores:

• Update test file copyright years through 2026.

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: MyLeeJiEun

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[deepin-ci-robot]

Hi @MyLeeJiEun. Thanks for your PR. 😃

[github-actions]

Warning

[Debian检查]

• 检测到敏感词unset变动

详情

    {
    "unset": {
        "dconfig-center/tests/test_helper.hpp": {
            "b": [
                "            qunsetenv(m_name);"
            ]
        },
        "dconfig-center/tests/ut_dconfigconn.cpp": {
            "b": [
                "        qunsetenv(\"STATE_DIRECTORY\");",
                "        qunsetenv(\"STATE_DIRECTORY\");",
                "// Branch: isDefaultValue() returns true for unset key (default)"
            ]
        },
        "dconfig-center/tests/ut_helper.cpp": {
            "b": [
                "        qunsetenv(\"DSG_CONFIG_CONNECTION_DISABLE_DBUS\");"
            ]
        }
    }
}

[deepin-ci-robot]

Hi @MyLeeJiEun. Thanks for your PR.

I'm waiting for a linuxdeepin member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[sourcery-ai]

Reviewer's Guide

This PR substantially broadens dconfig-center unit coverage by adding utility/helper suites and extensive connection, resource, and server branch tests, while improving fixture isolation and introducing opt-in lcov report generation; the reported result is 202 passing, 0 failing, and 6 skipped tests with 86.3% line and 96.9% function coverage.

File-Level Changes

Change	Details	Files
Expanded dconfig-center unit-test coverage across global utilities, helper functions, connection/resource behavior, and server lifecycle, synchronization, cache, and reload paths.	Added focused tests for path/key conversion, configuration ID parsing, user/process lookup, object pooling, filesystem discovery, QVariant/DBus conversion, validation, translation, and user enumeration. Added connection/resource assertions for metadata access, permissions, signals, cache behavior, persistence, reparsing, resource queries, and branch/error handling. Added server tests for user-data removal, lifecycle and exit behavior, path validation, reload/update/sync handling, cache synchronization, resource release, and invalid inputs.	dconfig-center/tests/ut_dconfig_global.cpp dconfig-center/tests/ut_helper.cpp dconfig-center/tests/ut_dconfigconn.cpp dconfig-center/tests/ut_dconfigserver.cpp
Improved test isolation and cleanup for environment variables, temporary state, and modified metadata files.	Added MetaFileGuard RAII restoration for metadata fixtures. Updated EnvGuard to restore unset variables correctly and recursively remove directories created by tests. Moved tests to per-process temporary paths and cleaned state after test suites.	dconfig-center/tests/test_helper.hpp dconfig-center/tests/ut_dconfigconn.cpp dconfig-center/tests/ut_dconfigserver.cpp dconfig-center/tests/ut_helper.cpp
Made coverage instrumentation opt-in and added a CMake coverage-report target.	Replaced the unconditional unit-test coverage flag with ENABLE_COVERAGE. Added lcov filtering and genhtml report generation when tools are available. Registered the new test sources and enabled private/protected member access for tests.	dconfig-center/tests/CMakeLists.txt
Updated SPDX copyright year ranges in the modified test infrastructure and sources.	Updated file headers through 2026.	dconfig-center/tests/CMakeLists.txt dconfig-center/tests/test_helper.hpp dconfig-center/tests/ut_dconfig_global.cpp dconfig-center/tests/ut_dconfigconn.cpp dconfig-center/tests/ut_dconfigserver.cpp dconfig-center/tests/ut_helper.cpp

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