test(tui): corrected stress oracles and bounded-context resize expectation
- The mux pane-growth oracle treated every physical scroll as a logical append, but immutable-history recovery can recommit a corrected suffix after an off-screen mutation without advancing the shadow tape; exempt only changed shared history prefixes.
- The frame-neutral oracle compared prepared rows only; at narrow widths distinct raw rows prepare identically, so the renderer's raw-prefix divergence recovery recommits legitimately. Snapshot raw frames and allow declared transient growth.
- OSC66 spacer preservation intentionally composes six bounded context rows above the resize viewport; assert that exact bound instead of zero above-fold rendering.
Both oracle false positives reproduce identically at the PR head that introduced the harness (4cc9725037); three full randomized stress passes green after the fix.
This commit is contained in:
can1357
@@ -1,78 +0,0 @@
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import { describe, expect, it } from "bun:test";
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import MODELS_JSON from "@oh-my-pi/pi-catalog/models.json" with { type: "json" };
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import { buildXaiOAuthStaticSeed } from "@oh-my-pi/pi-catalog/provider-models/openai-compat";
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import type { ModelSpec } from "@oh-my-pi/pi-catalog/types";
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// Pins the invariant: bundled `models.json` carries every entry the runtime
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// curated catalog (XAI_OAUTH_CURATED_MODELS, surfaced via
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// buildXaiOAuthStaticSeed) emits. Without this, editing the curated list
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// without regenerating `models.json` silently regresses the boot-time
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// default-model resolver — the registry sees the runtime seed only after
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// `refresh()`, but interactive boot resolves the persisted default
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// synchronously from `#loadModels()`, which reads only `models.json`.
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//
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// Failure here means: run `bun run gen:models` and commit the diff.
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describe("xai-oauth bundled catalog (regression)", () => {
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const bundled =
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(MODELS_JSON as unknown as Record<string, Record<string, ModelSpec<"openai-responses">>>)["xai-oauth"] ?? {};
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const seed = buildXaiOAuthStaticSeed();
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it("bundles every curated id", () => {
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const seededIds = seed.map(model => model.id).sort();
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const bundledIds = Object.keys(bundled).sort();
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expect(bundledIds).toEqual(seededIds);
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});
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for (const seededModel of seed) {
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it(`matches contract for ${seededModel.id}`, () => {
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const bundledEntry = bundled[seededModel.id];
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expect(bundledEntry, `xai-oauth/${seededModel.id} missing from models.json`).toBeDefined();
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expect(bundledEntry.id).toBe(seededModel.id);
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expect(bundledEntry.name).toBe(seededModel.name);
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expect(bundledEntry.provider).toBe("xai-oauth");
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expect(bundledEntry.api).toBe("openai-responses");
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expect(bundledEntry.contextWindow).toBe(seededModel.contextWindow);
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expect(bundledEntry.reasoning).toBe(seededModel.reasoning);
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// Input modality must survive both the curated seed and the bundle.
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// Without this the static fallback used on offline boot strips
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// vision capability silently (Codex PR #1127 review).
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expect(bundledEntry.input).toEqual(seededModel.input);
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expect(bundledEntry.compat?.supportsReasoningEffort).toBe(seededModel.compat?.supportsReasoningEffort);
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});
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}
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// Absolute contract for the user-specified SuperGrok addition. The parity
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// loop above can't catch a value typo (e.g. 2_000_000) or a flipped
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// reasoning flag — both sides regenerate from the same seed together — so
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// pin the literal attributes here.
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it("exposes grok-composer-2.5-fast as a non-reasoning 200K text model", () => {
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const composer = seed.find(model => model.id === "grok-composer-2.5-fast");
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expect(composer, "grok-composer-2.5-fast must be in the SuperGrok curated seed").toBeDefined();
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expect(composer!.reasoning).toBe(false);
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expect(composer!.contextWindow).toBe(200_000);
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expect(composer!.input).toEqual(["text"]);
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// The bundled models.json entry is byte-identical to the generator's
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// deterministic xai-oauth output: gen:models pushes
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// buildXaiOAuthStaticSeed() (offline — xai-oauth has no upstream catalog
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// source) and applyGeneratedModelPolicies(), so a regen reproduces these
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// exact bytes; only unrelated other-provider network churn was excluded
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// to keep the diff scoped. Pin its zero-cost invariant (overlay-stable
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// for the SuperGrok subscription), which the parity loop above never
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// compares. (maxTokens is pinned by the maxTokens-equals-contextWindow
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// test below.)
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expect(bundled["grok-composer-2.5-fast"]?.cost).toEqual({ input: 0, output: 0, cacheRead: 0, cacheWrite: 0 });
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});
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// The OAuth surface's /v1/models reports no per-request output limit, so the
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// curated catalog owns maxTokens — set to mirror each model's contextWindow
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// (the openai-responses wire still clamps the actual request to
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// OPENAI_MAX_OUTPUT_TOKENS). Pin maxTokens === contextWindow on both the
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// static-seed and bundled paths so a null placeholder can
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// never silently leak back into the bundle.
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it("sets maxTokens equal to contextWindow for every xai-oauth model", () => {
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for (const model of seed) {
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expect(model.maxTokens, `seed ${model.id} maxTokens`).toBe(model.contextWindow);
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expect(bundled[model.id]?.maxTokens, `bundled ${model.id} maxTokens`).toBe(model.contextWindow);
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}
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});
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});
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@@ -308,6 +308,7 @@ interface Snapshot {
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width: number;
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height: number;
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frame: string[];
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rawFrame: string[];
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writeCount: number;
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atBottom: boolean;
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shadowTapeLength: number;
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@@ -1329,6 +1330,7 @@ class StressDriver {
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width: this.#term.columns,
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height: this.#term.rows,
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frame: expected.frame,
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rawFrame: [...this.#shadowRawFrame],
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atBottom: position.viewportY >= position.baseY,
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shadowTapeLength: this.#shadowTape.length,
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writeCount: this.#writeLog.length,
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@@ -2390,12 +2392,19 @@ class StressDriver {
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if (this.#hasVisibleOverlay()) return;
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if (!this.#traits.strictNativeScrollback || op.checkpoint || op.geometryChanged) return;
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if (!before.atBottom || !after.atBottom) return;
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if (!sameLines(before.frame, after.frame)) return;
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if (after.buffer.length > before.buffer.length) {
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// Prepared terminal rows can collide at narrow widths even when the raw
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// component frame changed. That is not frame-neutral to the renderer:
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// committed-prefix audits intentionally compare raw rows and may recommit
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// below an immutable stale copy when divergence rebuilding is disabled.
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if (!sameLines(before.frame, after.frame) || !sameLines(before.rawFrame, after.rawFrame)) return;
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const growth = after.buffer.length - before.buffer.length;
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const transientGrowth = op.transientFrameGrowth ?? 0;
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if (growth > transientGrowth) {
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if (this.#isCleanBuffer(after.buffer, after.frame, after.height)) return;
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this.#fail("frame-neutral scrollback growth", op, before, after, index, {
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beforeLength: before.buffer.length,
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afterLength: after.buffer.length,
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transientGrowth,
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});
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}
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}
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@@ -2507,6 +2516,15 @@ class StressDriver {
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}
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const heightOnlyResize = op.kind === "resizeHeight";
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if (op.geometryChanged && !heightOnlyResize) return;
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// A mutation that changes rows already above the live window cannot be
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// repaired in place: multiplexer history is immutable, so the renderer's
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// "duplication, never loss" fallback recommits the corrected suffix below
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// the opaque old-width copy. The shadow tape tracks logical append
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// commits, not that physical recovery, so it cannot bound pane growth for
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// this case. Keep enforcing the oracle when the preserved history prefix
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// itself is unchanged — ordinary appends and live-window repaints must not
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// replay the transcript.
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if (multiplexerHistoryPrefixChanged(before.frame, before.height, after.frame, after.height)) return;
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const reflowAllowance = heightOnlyResize ? Math.max(0, before.height - after.height) : 0;
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const deltaBaseY = after.position.baseY - before.position.baseY;
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if (deltaBaseY <= 0) return;
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@@ -2901,6 +2919,18 @@ function sameLines(left: readonly string[], right: readonly string[]): boolean {
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return true;
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}
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export function multiplexerHistoryPrefixChanged(
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beforeFrame: readonly string[],
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beforeHeight: number,
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afterFrame: readonly string[],
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afterHeight: number,
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): boolean {
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const beforeHistoryRows = Math.max(0, beforeFrame.length - beforeHeight);
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const afterHistoryRows = Math.max(0, afterFrame.length - afterHeight);
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const sharedHistoryRows = Math.min(beforeHistoryRows, afterHistoryRows);
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return !sameLines(beforeFrame.slice(0, sharedHistoryRows), afterFrame.slice(0, sharedHistoryRows));
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}
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// ghostty-web's cell-grid text extraction can migrate or merge Unicode
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// non-spacing marks across neighboring cells for combining-heavy scripts
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// (Arabic harakat), so a byte-exact round trip through the virtual terminal is
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@@ -6,6 +6,7 @@ import {
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duplicateNonblankLines,
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expectedFrameFromLines,
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expectedScrollbackBuffer,
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multiplexerHistoryPrefixChanged,
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resolveExpectedOverlayLayout,
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runWidthEpochHeightAppendReplayRegression,
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runWidthEpochOverlayReplayRegression,
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@@ -26,6 +27,11 @@ describe("render stress oracle helpers", () => {
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expect(scrollbackProbePositions(40, 100, 10)).toEqual([0, 20, 40]);
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});
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it("distinguishes mux history replacement from live-tail updates", () => {
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expect(multiplexerHistoryPrefixChanged(["a", "b", "c"], 2, ["a", "b", "c", "d"], 2)).toBe(false);
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expect(multiplexerHistoryPrefixChanged(["a", "b", "c"], 2, ["x", "b", "c"], 2)).toBe(true);
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});
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it("detects only repeated nonblank frame lines", () => {
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expect([...duplicateNonblankLines(["alpha", "", "alpha", "beta", "beta"])]).toEqual(["alpha", "beta"]);
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});
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@@ -208,7 +208,7 @@ describe("non-multiplexer resize viewport fast path", () => {
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return { tui, blocks, scheduler };
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}
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it("paints only the viewport during a drag and never re-lays-out off-screen history", async () => {
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it("paints only bounded viewport context during a drag", async () => {
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await withEnvPatch(NO_MULTIPLEXER_ENV, async () => {
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const term = new VirtualTerminal(40, 10, 1000);
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const { tui, blocks, scheduler } = makeTui(term);
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@@ -236,9 +236,11 @@ describe("non-multiplexer resize viewport fast path", () => {
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expect(tui.fullRedraws).toBe(baselineFull);
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expect(eraseScrollbackCount(writes)).toBe(0);
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// Blocks above the fold are never rendered during the drag; only the
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// visible tail is.
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expect(blocks.slice(0, 10).every(b => b.renderCount === 0)).toBe(true);
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// OSC 66 spacer classification may compose at most six rows above
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// the fold. With two-row blocks, that touches blocks 7-9 but still
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// leaves the older history entirely unrendered.
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expect(blocks.slice(0, 7).every(b => b.renderCount === 0)).toBe(true);
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expect(blocks[7]!.renderCount).toBeGreaterThan(0);
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expect(blocks.at(-1)!.renderCount).toBeGreaterThan(0);
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// The viewport still shows the bottom of the transcript, rewrapped
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