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internal/supervisor/auth_test.go defines authenticationManager, whose ClientState() returns a configurable clientIdentity; its Start(), StopAndWait(), Wait(), and CleanupOrphans() methods succeed without action, and Close() is empty.currentIdentity() in internal/supervisor/auth_test.go returns the current process PID with ActiveState: "active", SubState: "running", ControlGroup: expectedClientCgroup, and InvocationID: []byte("0123456789abcdef").authenticate() and peer.Recheck() accept the current Unix peer with the expected UID, GID, PID, active/running state, cgroup, and invocation ID. Rejection cases are tested separately for wrong UID, wrong GID, changed PID, ActiveState: "inactive", SubState: "exited", ControlGroup: "/wrong", and nil InvocationID (internal/supervisor/auth_test.go:38-80).TestRecheckRejectsChangedInvocation authenticates with invocation ID "0123456789abcdef", changes it to "fedcba9876543210", and requires peer.Recheck() to fail (internal/supervisor/auth_test.go:82-96).internal/supervisor/systemd_test.go verifies valid unit-name grammar with opencode-pty-0123456789abcdef0123456789abcdef.service; rejected forms include an empty ID, uppercase hexadecimal ID, .scope suffix, and .service/../x traversal suffix (internal/supervisor/systemd_test.go:13-28).waitForUnitSignal() tests require failure for a closed D-Bus signal channel and propagation of context.DeadlineExceeded from a 1ms timeout (internal/supervisor/systemd_test.go:30-41).waitForJobResult() tests require failure for a closed result channel and for non-"done" result "canceled", plus propagation of context.DeadlineExceeded from a 1ms timeout (internal/supervisor/systemd_test.go:43-59).TestUnitPropertiesAreFixed calls unitProperties() for unit opencode-pty-0123456789abcdef0123456789abcdef.service, command sh -c "echo ok", /dev/null streams, and runtime 60. It requires properties named User, Group, SupplementaryGroups, NoNewPrivileges, CapabilityBoundingSet, AmbientCapabilities, UMask, KillMode, KillSignal, FinalKillSignal, SendSIGKILL, TimeoutStopUSec, OOMPolicy, Delegate, Slice, BindsTo, After, StandardInputFileDescriptor, StandardOutputFileDescriptor, StandardErrorFileDescriptor, InaccessiblePaths, PrivateDevices, DevicePolicy, ProtectControlGroups, ProtectProc, ProcSubset, RestrictNamespaces, RestrictAddressFamilies, SystemCallArchitectures, SystemCallFilter, CPUAccounting, MemoryAccounting, TasksAccounting, IOAccounting, CPUQuotaPerSecUSec, MemoryHigh, MemoryMax, TasksMax, and RuntimeMaxUSec (internal/supervisor/systemd_test.go:61-91).User == "byk", Delegate == false, D-Bus signature "(bas)" for RestrictAddressFamilies and SystemCallFilter, and signature "as" for SupplementaryGroups (internal/supervisor/systemd_test.go:77-90).decodeUnitResult() is tested with {"Result":"exit-code","ExecMainCode":int32(1),"ExecMainStatus":int32(7)} and must return Result: "exit-code", ExecMainCode: 1, and ExecMainStatus: 7 (internal/supervisor/systemd_test.go:93-101).copyInput, detecting disconnect while input forwarding blocks, and an end-to-end TestTypeScriptTransportUsesHelperAndSplitsWrites; the visible transport test sends TypeStarted with unit opencode-pty-0123456789abcdef0123456789abcdef.service.internal/protocol/frame_test.go tests Start round-trip preservation with Device: 12, Inode: 34, RuntimeSec: 60, command "printf", and arguments ["%s", "hello world"]; it also tests a TypeInput frame round trip with payload "hello" (internal/protocol/frame_test.go:10-38).MarshalFrame() to return ErrFrameTooLarge for a payload of MaxFrameSize+1, and EncodeStart() to return ErrInvalidFrame for argument "a\x00b", a command of MaxCommandSize+1 bytes, an argument of MaxArgSize+1 bytes, aggregate arguments of MaxArgsSize+1 bytes, and an invalid UTF-8 command containing byte 0xff (internal/protocol/frame_test.go:40-67).FuzzParsePacket seeds fuzzing with a marshaled TypeInput frame carrying payload "seed" and passes arbitrary generated byte slices to ParsePacket() (internal/protocol/frame_test.go:69-78).cmd/client/main_test.go contains a Node integration test proving a connected Unix socket can be inherited by the Go helper without changing the socket peer’s main PID: Node opens cwd, spawns the helper with the socket as fd 3 and cwd as fd 4, and the server verifies SO_PEERCRED.Pid equals the Node process PID rather than the helper PID (cmd/client/main_test.go:20-83).MSG_TRUNC or MSG_CTRUNC. After helper exit, an unrelated /bin/sh child checks that /proc/self/fd/3 and /proc/self/fd/4 do not exist, guarding against descriptor leakage into later children (cmd/client/main_test.go:45-110).TestSendStartTransfersExactlyOneCloexecDirectoryDescriptor uses a SOCK_STREAM|SOCK_CLOEXEC Unix socket pair, sends runtime "60", command "/bin/printf", and argument "ok", receives with MSG_CMSG_CLOEXEC, and requires exactly one SCM_RIGHTS descriptor with FD_CLOEXEC, no truncation, and a decoded start command/argument matching "/bin/printf" and ["ok"] (cmd/client/main_test.go:126-179).protocol.MaxCommandSize+1; one argument of protocol.MaxArgSize+1; and aggregate arguments consisting of four protocol.MaxArgSize strings plus "x" (cmd/client/main_test.go:181-192).cmd/launcher/main_test.go verifies decodeArguments() preserves the exact decoded sequence ["printf", "%s\\n", "a'b; $(id)", ""], including shell metacharacters and an empty final argument; encoded input "bad=" must be rejected (cmd/launcher/main_test.go:13-34).scriptArguments() to equal exactly ["script", "-q", "-e", "-f", "-c", "/bin/sh -i -c 'exec /proc/self/fd/3 --exec'", "/dev/null"] (cmd/launcher/main_test.go:36-42).TestLauncherExecutesInDescriptorDirectory builds the launcher, passes a temporary directory handle through the child’s stderr/fd 2, runs encoded /usr/bin/pwd, and requires normalized PTY output to contain that temporary directory followed by a newline (cmd/launcher/main_test.go:44-62)./bin/sh -c "exit 7" and /bin/sh -c "kill -TERM $$" and require resulting exit codes 7 and 143, respectively (cmd/launcher/main_test.go:64-95).TestLauncherPreservesMetacharactersAndNewlinesWithoutEvaluation passes the literal value "a'b; $(id)\nsecond line" to /usr/bin/printf "%s\n" and requires exact output after removing PTY carriage returns, proving metacharacters and embedded newlines are not shell-evaluated (cmd/launcher/main_test.go:97-116).go build -trimpath -o <temporary-path>/opencode-pty-launcher . (cmd/launcher/main_test.go:118-126).opencode-pty-supervisor.service defines Description=OpenCode PTY supervisor, starts after and requires dbus.service, uses Type=exec, runs as User=root and Group=byk with empty SupplementaryGroups, and executes /usr/local/libexec/opencode-pty-supervisor.opencode-pty-supervisor.service creates RuntimeDirectory=opencode-pty with mode 0750 and RuntimeDirectoryPreserve=no; process controls are NoNewPrivileges=yes, empty CapabilityBoundingSet and AmbientCapabilities, UMask=0077, KillMode=control-group, KillSignal=SIGTERM, FinalKillSignal=SIGKILL, SendSIGKILL=yes, TimeoutStopSec=20s, OOMPolicy=kill, and Delegate=no.opencode-pty-supervisor.service isolation settings are RestrictAddressFamilies=AF_UNIX, PrivateTmp=yes, PrivateDevices=yes, PrivateMounts=yes, PrivateNetwork=yes, ProtectSystem=strict, ProtectHome=yes, ProtectKernelTunables=yes, ProtectKernelModules=yes, ProtectKernelLogs=yes, ProtectControlGroups=yes, ProtectClock=yes, ProtectHostname=yes, ProtectProc=invisible, and ProcSubset=pid.opencode-pty-supervisor.service hardening uses RestrictNamespaces=yes, RestrictSUIDSGID=yes, LockPersonality=yes, MemoryDenyWriteExecute=yes, SystemCallArchitectures=native, SystemCallFilter=~@clock @cpu-emulation @debug @module @mount @obsolete @privileged @raw-io @reboot @resources @swap, RestrictRealtime=yes, and DevicePolicy=closed.opencode-pty-supervisor.service makes /run/docker.sock, /run/user/1000/bus, and /var/run/docker.sock inaccessible. Resource controls enable CPU, memory, task, and I/O accounting with MemoryHigh=192M, MemoryMax=256M, and TasksMax=64; installation target is multi-user.target.opencode-pty.slice defines Description=OpenCode isolated PTY sessions, orders itself Before=slices.target, enables CPU, memory, task, and I/O accounting, and sets CPUQuota=800%, IOWeight=100, MemoryHigh=1536M, MemoryMax=2G, and TasksMax=512.