Add comprehensive unit tests for plugin packages with 90.1% coverage in special package#250

Draft

Copilot wants to merge 3 commits intomasterfrom

copilot/fix-d0e73756-1d4b-4ed7-b0c2-32902bc3b5cb

Commits on Aug 20, 2025

Initial plan
Copilot
committed
Complete comprehensive unit tests for plugin/special package with 90.1% coverage

Copilot
and
Loyalsoldier
committed
Add comprehensive unit tests for mihomo, v2ray, singbox, and plaintext plugin packages

Copilot
and
Loyalsoldier
committed