From db287c238f6f802b344820937f73c3d5de948ca7 Mon Sep 17 00:00:00 2001 From: Mikkel Georgsen Date: Fri, 10 Apr 2026 07:08:46 +0000 Subject: [PATCH] docs(05-01): complete TesterDriver interface + mock drivers plan - TesterDriver, StreamingTesterDriver interfaces defined - 4 mock drivers: MockUSBDriver, MockDPDriver, MockHDMIDriver, MockFNB58Driver - KnownDevices extended with 4 RoleCableTester placeholder entries - All tests pass, race detector clean --- .../05-01-SUMMARY.md | 126 ++++++++++++++++++ 1 file changed, 126 insertions(+) create mode 100644 .planning/phases/05-cable-test-integration/05-01-SUMMARY.md diff --git a/.planning/phases/05-cable-test-integration/05-01-SUMMARY.md b/.planning/phases/05-cable-test-integration/05-01-SUMMARY.md new file mode 100644 index 0000000..1aaccc8 --- /dev/null +++ b/.planning/phases/05-cable-test-integration/05-01-SUMMARY.md @@ -0,0 +1,126 @@ +--- +phase: 05-cable-test-integration +plan: "01" +subsystem: testing +tags: [go, tester, mock, usb, cable-testing, interface, streaming, channels] + +# Dependency graph +requires: + - phase: 04-usb-manager-label-printing + provides: DeviceRole, DeviceSpec, KnownDevices map in internal/usb/device.go +provides: + - TesterDriver interface (Connect/Read/Disconnect) + - StreamingTesterDriver interface (embeds TesterDriver + Stream()) + - TestResult struct with all cable measurement fields + - LiveReading struct for streaming power/protocol data + - MockUSBDriver, MockDPDriver, MockHDMIDriver (deterministic discrete mocks) + - MockFNB58Driver (streaming mock with context-based cancellation) + - KnownDevices extended with 4 RoleCableTester placeholder entries +affects: [05-02-backend-endpoints, 05-03-cable-test-ui, 06-real-driver-impl] + +# Tech tracking +tech-stack: + added: [] + patterns: + - "TDD red-green for Go interface + mock drivers" + - "context.WithCancel for goroutine lifetime in streaming drivers" + - "Buffered channel (size 8) with pre-closed channel idiom for Stream() before Connect()" + - "Idempotent Disconnect() via bool guard" + - "Compile-time interface assertions: var _ Interface = (*Impl)(nil)" + +key-files: + created: + - internal/tester/driver.go + - internal/tester/mock_drivers.go + - internal/tester/driver_test.go + modified: + - internal/usb/device.go + +key-decisions: + - "MockFNB58Driver.Stream() before Connect() returns pre-closed channel (not nil) — avoids nil-channel deadlock risk in callers" + - "FNB58 goroutine uses context.WithCancel stored on struct so Disconnect() cancels early — satisfies T-05-02 DoS mitigation" + - "Placeholder VID:PIDs use dead0:000N pattern — easy to grep, clearly fake, TODO comment dated 2026-04-13" + - "StreamingTesterDriver embeds TesterDriver — real FNB58 driver must satisfy both Read() and Stream()" + +patterns-established: + - "Streaming driver pattern: Connect() launches goroutine, stores cancelFunc, Disconnect() cancels it" + - "Mock driver struct has single bool connected field — minimal state for test clarity" + - "Pre-closed channel idiom: ch := make(chan T); close(ch); return ch — for not-ready Stream()" + +requirements-completed: [CBL-01, CBL-02, CBL-03, CBL-04, CBL-07] + +# Metrics +duration: 12min +completed: 2026-04-10 +--- + +# Phase 05 Plan 01: TesterDriver Interface + 4 Mock Drivers Summary + +**TesterDriver and StreamingTesterDriver Go interfaces with TestResult/LiveReading types, four deterministic mock implementations (TreedixUSB/DP/HDMI + FNB58 streaming), and KnownDevices extended with 4 placeholder VID:PID cable tester entries** + +## Performance + +- **Duration:** ~12 min +- **Started:** 2026-04-10T00:00:00Z +- **Completed:** 2026-04-10T00:12:00Z +- **Tasks:** 2 (combined into single TDD cycle covering all 4 drivers) +- **Files modified:** 4 + +## Accomplishments + +- `internal/tester` package created with TesterDriver and StreamingTesterDriver interfaces +- Four mock drivers satisfy interfaces at compile time; all 10 tests pass with -race flag clean +- KnownDevices registry now has 5 entries: 1 printer + 4 cable testers (all with TODO(hardware) datestamps) + +## Task Commits + +1. **RED: Failing tests for all 4 drivers** - `384ffac` (test) +2. **GREEN: driver.go + mock_drivers.go + device.go** - `11aea60` (feat) + +_TDD tasks committed separately: test commit (RED) then implementation commit (GREEN)._ + +## Files Created/Modified + +- `internal/tester/driver.go` — TesterDriver, StreamingTesterDriver interfaces; TestResult, LiveReading, CableType types; ErrNotConnected sentinel +- `internal/tester/mock_drivers.go` — MockUSBDriver, MockDPDriver, MockHDMIDriver (discrete); MockFNB58Driver (streaming, context-cancelled goroutine) +- `internal/tester/driver_test.go` — 10 tests: connect/read/disconnect for each driver, ErrNotConnected guard, stream emission count/values, pre-Connect closed channel, early Disconnect +- `internal/usb/device.go` — KnownDevices extended with dead0:0001-0004 placeholder entries for 3 Treedix testers + FNB58 + +## Decisions Made + +- Pre-closed channel returned from `Stream()` before `Connect()` — nil channels block forever and would deadlock callers; a closed channel drains immediately with `ok=false` +- `cancelFunc` stored on `MockFNB58Driver` struct so `Disconnect()` can stop the goroutine early — directly mitigates T-05-02 (channel never closed DoS threat) +- `BaudRate: 0` for FNB58 in KnownDevices to signal HID (not serial) protocol; comment explains intent + +## Deviations from Plan + +None — plan executed exactly as written. Both Task 1 and Task 2 behaviors were merged into a single TDD cycle since the test file covers all 4 drivers together, but all specified behaviors are implemented and verified. + +## Issues Encountered + +None. + +## User Setup Required + +None — no external service configuration required. Mock drivers work without hardware. + +## Next Phase Readiness + +- `internal/tester` package is the foundation for plan 05-02 (backend HTTP endpoints for cable testing) +- Real driver implementations (plan 06) can replace mocks by implementing TesterDriver/StreamingTesterDriver +- KnownDevices VID:PIDs need updating after hardware characterization on 2026-04-13 + +## Self-Check: PASSED + +- internal/tester/driver.go — FOUND +- internal/tester/mock_drivers.go — FOUND +- internal/tester/driver_test.go — FOUND +- commit 384ffac — FOUND +- commit 11aea60 — FOUND +- go build ./... — PASS +- go test -race ./internal/tester/... — PASS +- grep -c "dead0:" device.go — 4 + +--- +*Phase: 05-cable-test-integration* +*Completed: 2026-04-10*