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/**
* Tests for `src/lib/cache-warming.svelte.ts` — the prompt-cache warming
* timer/orchestration store.
*
* Drives the REAL `$state`-backed store via `createCacheWarmingStore()` under
* fake timers, asserting the idle/turn/send lifecycle, the repeating 4-minute
* cadence, the warming-specific last-% capture, and error surfacing.
*/
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
// `config.ts` reads localStorage at import; mock it (mirrors chat-store.test).
vi.mock("../src/lib/config.js", () => ({
config: {
apiBase: "http://test.local:3000",
wsUrl: "ws://test.local:3000/ws",
defaultApiBase: "http://test.local:3000",
setApiBase: vi.fn(),
},
}));
function makeLocalStorageMock(): Storage {
const store = new Map<string, string>();
return {
getItem: (k: string) => store.get(k) ?? null,
setItem: (k: string, v: string) => {
store.set(k, v);
},
removeItem: (k: string) => {
store.delete(k);
},
clear: () => {
store.clear();
},
get length() {
return store.size;
},
key: (i: number) => Array.from(store.keys())[i] ?? null,
};
}
import { createCacheWarmingStore, WARM_INTERVAL_MS } from "../src/lib/cache-warming.svelte.js";
type WarmStore = ReturnType<typeof createCacheWarmingStore>;
function makeFetchOk(usage: { inputTokens: number; cacheReadTokens: number }): typeof fetch {
return vi.fn(() =>
Promise.resolve({
ok: true,
status: 200,
json: () => Promise.resolve({ usage }),
}),
) as unknown as typeof fetch;
}
/** Flush microtasks so awaited fetch `.json()` chains settle under fake timers. */
async function flush(): Promise<void> {
await Promise.resolve();
await Promise.resolve();
await Promise.resolve();
}
let store: WarmStore;
beforeEach(() => {
vi.useFakeTimers();
vi.stubGlobal("localStorage", makeLocalStorageMock());
store = createCacheWarmingStore();
});
afterEach(() => {
vi.useRealTimers();
vi.unstubAllGlobals();
});
describe("enable / disable lifecycle", () => {
it("arms a countdown when enabled and idle", () => {
store.setEnabled("tab-1", true);
const s = store.stateFor("tab-1");
expect(s.enabled).toBe(true);
expect(s.nextFireAt).not.toBeNull();
});
it("cancels the countdown when disabled", () => {
store.setEnabled("tab-1", true);
store.setEnabled("tab-1", false);
expect(store.stateFor("tab-1").nextFireAt).toBeNull();
});
it("does not arm a disabled tab", () => {
const s = store.stateFor("tab-2");
expect(s.enabled).toBe(false);
expect(s.nextFireAt).toBeNull();
});
});
describe("firing cadence", () => {
it("fires after the interval and captures the warming last-%", async () => {
const fetchMock = makeFetchOk({ inputTokens: 1000, cacheReadTokens: 900 });
vi.stubGlobal("fetch", fetchMock);
store.setRequestResolver(() => ({
keyId: "k",
modelId: "m",
agentModels: null,
reasoningEffort: "high",
}));
store.setEnabled("tab-1", true);
await vi.advanceTimersByTimeAsync(WARM_INTERVAL_MS);
await flush();
expect(fetchMock).toHaveBeenCalledTimes(1);
const [url, opts] = (fetchMock as unknown as { mock: { calls: unknown[][] } }).mock
.calls[0] as [string, { body: string }];
expect(url).toContain("/chat/warm");
// The request forwards the SAME effort the real turn uses — it's an
// Anthropic message-cache key, so warming must match it to refresh the
// bucket the next real message reads.
expect(JSON.parse(opts.body)).toMatchObject({
tabId: "tab-1",
keyId: "k",
modelId: "m",
reasoningEffort: "high",
});
const s = store.stateFor("tab-1");
expect(s.lastPct).toBe(90); // 900 / 1000
expect(s.error).toBeNull();
});
it("re-arms repeatedly (not a one-shot)", async () => {
const fetchMock = makeFetchOk({ inputTokens: 1000, cacheReadTokens: 800 });
vi.stubGlobal("fetch", fetchMock);
store.setEnabled("tab-1", true);
await vi.advanceTimersByTimeAsync(WARM_INTERVAL_MS);
await flush();
expect(fetchMock).toHaveBeenCalledTimes(1);
// After the first fire it re-arms, so a second interval fires again.
expect(store.stateFor("tab-1").nextFireAt).not.toBeNull();
await vi.advanceTimersByTimeAsync(WARM_INTERVAL_MS);
await flush();
expect(fetchMock).toHaveBeenCalledTimes(2);
});
it("shows '-%' (null) before it has ever fired", () => {
store.setEnabled("tab-1", true);
expect(store.stateFor("tab-1").lastPct).toBeNull();
});
});
describe("turn-state gating", () => {
it("does NOT fire while a turn is active", async () => {
const fetchMock = makeFetchOk({ inputTokens: 10, cacheReadTokens: 5 });
vi.stubGlobal("fetch", fetchMock);
store.setEnabled("tab-1", true);
store.onTurnActive("tab-1");
expect(store.stateFor("tab-1").nextFireAt).toBeNull();
await vi.advanceTimersByTimeAsync(WARM_INTERVAL_MS * 2);
await flush();
expect(fetchMock).not.toHaveBeenCalled();
});
it("re-arms when the turn ends (idle)", () => {
store.setEnabled("tab-1", true);
store.onTurnActive("tab-1");
store.onTurnEnded("tab-1");
expect(store.stateFor("tab-1").nextFireAt).not.toBeNull();
});
it("a real user message disables+resets the pending timer", async () => {
const fetchMock = makeFetchOk({ inputTokens: 10, cacheReadTokens: 5 });
vi.stubGlobal("fetch", fetchMock);
store.setEnabled("tab-1", true);
store.onUserMessage("tab-1");
expect(store.stateFor("tab-1").nextFireAt).toBeNull();
await vi.advanceTimersByTimeAsync(WARM_INTERVAL_MS);
await flush();
// The pending fire was cancelled by onUserMessage; nothing fired.
expect(fetchMock).not.toHaveBeenCalled();
});
});
describe("error surfacing", () => {
it("captures a non-OK HTTP error into state.error", async () => {
const fetchMock = vi.fn(() =>
Promise.resolve({
ok: false,
status: 500,
json: () => Promise.resolve({ error: "provider exploded" }),
}),
) as unknown as typeof fetch;
vi.stubGlobal("fetch", fetchMock);
store.setEnabled("tab-1", true);
await vi.advanceTimersByTimeAsync(WARM_INTERVAL_MS);
await flush();
expect(store.stateFor("tab-1").error).toBe("provider exploded");
});
it("captures a network rejection into state.error", async () => {
const fetchMock = vi.fn(() =>
Promise.reject(new Error("network down")),
) as unknown as typeof fetch;
vi.stubGlobal("fetch", fetchMock);
store.setEnabled("tab-1", true);
await vi.advanceTimersByTimeAsync(WARM_INTERVAL_MS);
await flush();
expect(store.stateFor("tab-1").error).toBe("network down");
});
});
describe("forgetTab / removeTab", () => {
it("forgetTab clears state, timers, and persisted preference for a closed tab", async () => {
const fetchMock = makeFetchOk({ inputTokens: 10, cacheReadTokens: 5 });
vi.stubGlobal("fetch", fetchMock);
store.setEnabled("tab-1", true);
store.forgetTab("tab-1");
// A fresh stateFor after removal is a default-off entry.
expect(store.stateFor("tab-1").enabled).toBe(false);
await vi.advanceTimersByTimeAsync(WARM_INTERVAL_MS * 2);
await flush();
expect(fetchMock).not.toHaveBeenCalled();
});
});
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