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agessaman
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Fork-owned, host-tested MQTT bridge lifecycle state machine and the narrow dependency seam to drive it deterministically, plus the cross-core ownership model. This is the Phase 4 "ownership and teardown test seams" safety net that must land before the Phase 5 cooperative-shutdown refactor. - src/helpers/MQTTLifecycle.h: pure state machine (Stopped->Starting->Running->StopRequested->Stopping->Stopped) + injected Ops seam (clock / task / resource owner / OTA barrier) + Coordinator with a bounded stop timeout. No Arduino/FreeRTOS/WiFi deps. - test/test_mqtt_lifecycle/: 18 GoogleTest cases covering the phase's teardown matrix (stop during every activity, callback timing, duplicate/early stop, restart, timeout fallback, no-access-after-release) and the OTA-barrier scenarios. - MQTT_OWNERSHIP.md: one owner per mutable runtime domain, current cross-core hazards with file:line references, target primitives, and Phase-0-pending (hardware-characterization) items. - STABILITY_TESTABILITY_HANDOFF.md: Phase 4 status and verified premise refinements. Scope: MQTTBridge.cpp is intentionally untouched. The production rewiring (plain-data snapshot publication, volatile-handshake replacement, cooperative shutdown) is deferred to Phase 5.
Host unit tests
Fast, hardware-free unit tests for the fork's pure logic, run on the host with
GoogleTest via PlatformIO's native environment. They cover the extractable
observer/WebConfig logic (validation, preset table, topic templates, key
parsing) — the parts that don't depend on the ESP32, radio, or network stack.
Integration behavior (AsyncTCP transport, WiFi/MQTT, SoftAP) is exercised
separately; see "Local testing without hardware" in MQTT_IMPLEMENTATION.md.
Running
pio test -e native # all suites
pio test -e native -f test_webconfig_keys # a single suite
A green [PASSED] per suite means GoogleTest returned 0 (all assertions
passed). PlatformIO's "0 test cases" line is just its Unity-style counter and
does not reflect the GoogleTest count — run the built binary directly
(.pio/build/native/program) to see the per-assertion breakdown.
Suites
| Suite | Source under test | Covers |
|---|---|---|
test_mqtt_presets |
src/helpers/MQTTPresets.h |
preset lookup; table integrity (unique names, non-empty URLs, JWT-audience invariant, names fit the slot buffer); mqttPresetNeedsSlotCredentials; slot-count constants |
test_observer_validation |
src/helpers/MQTTObserverValidation.h |
IATA (exactly 3 alphanumerics), owner key (64 hex), NTP hostname, and the buffer-fit check behind the #17 length validation — including boundaries and nulls |
test_webconfig_keys |
src/helpers/WebConfigKeys.h |
POST-key allowlist, secret detection, slot-index bounds, and the short-key out-of-bounds guard (attacker-supplied keys) |
test_topic_template |
src/helpers/MQTTTopicTemplate.h |
{iata}/{device}/{token}/{type} expansion, overflow/NUL-termination, and a buffer-size fuzz |
test_mqtt_topic_router |
src/helpers/MQTTTopicRouter.h |
complete preset/custom topic-routing contract; MeshRank packets-only behavior; required identifiers; invalid inputs/slots; exact buffer boundaries |
test_mqtt_connection_policy |
src/helpers/MQTTConnectionPolicy.h |
reconnect guard/backoff/stagger and breaker transitions; stable reset; JWT lifetime/renewal policy; exact timing boundaries and 32-bit millis() rollover |
test_mqtt_packet_queue_policy |
src/helpers/MQTTPacketQueuePolicy.h |
queue-full eviction; stale-disconnect flush; adaptive drain limits; bounded QoS0 retries; exact timing boundaries and 32-bit millis() rollover |
test_mqtt_runtime_buffer_lifecycle |
src/helpers/MQTTRuntimeBufferLifecycle.h |
idempotent allocation/release; partial-allocation degradation; retry of only missing buffers |
test_mqtt_prefs_codec |
src/helpers/MQTTPrefsStorage.h, src/helpers/MQTTPrefsCodec.h |
binary pre-slot/3-slot/6-slot migration fixtures; v1 header integrity; downgrade preservation |
test_mqtt_prefs_atomic_store |
src/helpers/MQTTPrefsAtomicStore.h |
transactional MQTT writes and legacy /node_prefs handoff; exact short-write detection; begin/finish/rename failure cleanup; original-file preservation |
test_mqtt_payload_builder |
src/helpers/MQTTPayloadBuilder.cpp |
status/packet/raw JSON contracts; optional fields; escaping; RX metrics and path; score handling; exact buffer bounds; maximum representative payloads |
test_utils |
src/Utils.cpp |
Utils::toHex (upstream) |
Conventions (and how to add a suite)
- Each
test/test_<name>/directory builds into its own GoogleTest program and must define its ownmain()(::testing::InitGoogleTest+RUN_ALL_TESTS). - Tests are host-only: include only pure headers. Arduino/crypto stubs live
in
test/mocks/(on the include path via-I test/mocks). - Firmware headers are included from
src(via-I src, e.g.#include "helpers/MQTTPresets.h"). Some are guarded or ESP-flavored, so a suite may need shims before the include — e.g.test_mqtt_presetsdoes#define WITH_MQTT_BRIDGE 1(the preset table is behind that flag) and#define PROGMEM(the embedded CA-cert strings are PROGMEM-qualified). - To add a suite: create
test/test_<name>/test_<name>.cppwith amain(), and add any host-only source it links to thenativeenv'sbuild_src_filterinplatformio.ini(header-only code needs no source entry). No other wiring. - Keep logic testable by extracting pure functions into headers (as
MQTTObserverValidation.h/WebConfigKeys.h/MQTTTopicTemplate.hdo) and having the firmware call the same functions.