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* feat(ltl): add Now/Next/Eventually/Implies/Or/And/Not formulas Replace the fold-with-latch evaluator with a residual-formula reducer. Each Observe() instantiates a fresh obligation from the root (stripping an outer Always), reduces each pending obligation against current state, latches Violated on first failure, and surfaces Pending verdicts for deferred obligations. Existing Always/Pure/Thunk tests continue to pass. * feat(ltl): support relative duration for eventually().within() * feat(proto): add Swipe, PressKey, RecentLogs RPCs * feat(verifier,runner): formula handles, new action kinds, rich state - verifier: add formula-spec registry; bindNow/bindNext/bindEventually with chainable .implies/.or/.and/.not and .within(n,unit) on eventually; bindFrom for uniform sampling. bindAlways keeps accepting plain predicates. - verifier: store lastTree, lastAction, step time, logs, exceptions on the Verifier; SnapshotInput replaces the (snapshots, tree) pair. stateObject now produces state.lastAction/time/logs/exceptions matching the TS State type. - verifier: make taps/swipes/waitOnce/pressKey built-in generators actually fire; taps picks a clickable, enabled element from the last hierarchy. - agent: add exceptions field to Message wire format. - driver: add Swipe/PressKey/RecentLogs to Driver interface; wire maestro client and mock driver. LogEntry exposed for runner consumption. - runner: apply Swipe/PressKey/Wait actions; collect logcat and exceptions; pass lastAction and step time into PushSnapshot. * feat(spec-api): LTL operators, new actions, richer State - ltl.ts exports now/next/eventually; always overload accepts a Formula - types.ts: Formula gains implies/or/and/not; EventuallyFormula adds .within; State gains lastAction/time/logs/exceptions; Swipe/PressKey/Wait action types - actions.ts: Swipe/PressKey/Wait/from constructors; waitOnce + pressKey default generators - tests exercise the chaining, sampling, and new actions through a recorded fake runtime * feat(sidecar): add swipe, pressKey, recentLogs RPC handlers * feat(sdk-android): capture uncaught exceptions Install a default uncaught handler on Uatu.start, chained with any existing handler so Android's crash reporter still runs. Expose Uatu.reportError for callers to forward caught throwables. A bounded circular buffer (default 50) drains into each STATE message's new exceptions field. Protocol.kt serializes/deserializes the field, matching the Go wire format added to internal/agent/protocol.go. * feat(spec-api): add @uatu/spec/defaults/properties bundle * feat(sample-app): exercise new LTL operators + defaults spec.ts now imports eventually/next/now/from from @uatu/spec and noUncaughtExceptions from @uatu/spec/defaults/properties. It declares three properties that exercise the new surface: - accountCountNonNegative: plain always() safety - addAccountAdvances: always(now(x).implies(next(y))) - eventuallyLoggedIn: eventually(p).within(30, "seconds") - noUncaughtExceptions: imported default The weighted actions root uses from() for random phone/name sampling and entries for taps/swipes/waitOnce/pressKey built-ins. SampleApplication gains a debug hook gated on the system property uatu.inject_error so the e2e run can synthesize an Uatu.reportError and verify noUncaughtExceptions violates. cmd/uatu/test_run.go adds a subpath alias so specs importing "@uatu/spec/defaults/properties" resolve against the in-tree source when running from the uatu checkout. The spec-integration tests swap the old click-counter fixtures for the new login hierarchy. * feat(trace): record swipe/key/wait details + exceptions trace.Step gains an Exceptions array so the trace captures the class/message/stackTrace for each SDK-reported throwable in a step. trace.Action gains FromX/FromY/ToX/ToY/Key/DurationMillis so the full payload of Swipe/PressKey/Wait actions is visible in trace.jsonl. sample-app's debug error hook now gates on ApplicationInfo.DEBUGGABLE instead of a system property (adb setprop fails on non-rooted emulators).
@uatu/spec
TypeScript spec API for uatu, a property-based UI fuzzer for mobile apps.
Spec authors write specs in TypeScript that describe what an app should always do (safety invariants), generate weighted actions to exercise the app, and extract structured state from the accessibility tree. The uatu CLI picks up the spec and drives the app under test.
Install
npm install --save-dev @uatu/spec
Usage
import { extract, always, actions, Tap, weighted } from "@uatu/spec";
export const spec = {
extract: extract((tree) => ({
onHomeScreen: tree.some((n) => n.text === "Home"),
})),
always: always(({ state }) => state.onHomeScreen || !state.startedOnHome),
actions: actions(({ tree }) =>
weighted([
[1, Tap(tree.first((n) => n.text === "Checkout"))],
]),
),
};
Version compatibility
@uatu/spec is released in lockstep with the uatu CLI. Pin the same major/minor version as your installed uatu binary.
License
Apache-2.0