MUST USE for C#/.NET deterministic tests that require the smallest production seam for DateTime/Task.Delay/File/Environment/Guid/Random, static API preservation, nested/parallel overrides, or no real I/O. USE ONLY when the target workspace contains C# source plus a .csproj or .sln.
安装
npx skills add dotnet/skills --skill testability-obstaclenpx skills add dotnet/skills --skill testability-obstacle -a claude-code -gnpx skills add dotnet/skills --skill testability-obstacle -a codex -ggemini skills install https://github.com/dotnet/skills.git --path plugins/dotnet-test/skills/testability-obstaclegh skill install dotnet/skills testability-obstaclegit clone --depth 1 https://github.com/dotnet/skills /tmp/dotnet__skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/dotnet__skills/plugins/dotnet-test/skills/testability-obstacle ~/.claude/skills/testability-obstacle # Claude Code
cp -R /tmp/dotnet__skills/plugins/dotnet-test/skills/testability-obstacle ~/.agents/skills/testability-obstacle # Codex, Cursor, Gemini CLI, Copilot, OpenCode