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import type { ChatQueuedMessage } from "@dispatch/transport-contract";
import type { AgentEvent } from "@dispatch/wire";
import { describe, expect, it, vi } from "vitest";
import { createChatStore } from "./store.svelte";
import {
createFakeCache,
createFakeHistorySync,
createFakeMetricsSync,
createFakeTransport,
} from "./test-helpers";
const images = [
{ url: "data:image/png;base64,AAAA", mimeType: "image/png" },
{ url: "data:image/png;base64,BBBB" },
];
function fixture(batched = false) {
const transport = createFakeTransport();
const history = createFakeHistorySync();
let nextId = 0;
const scheduled: (() => void)[] = [];
const store = createChatStore({
conversationId: "c1",
createRequestId: () => `r${++nextId}`,
transport: transport.impl,
historySync: history.impl,
metricsSync: createFakeMetricsSync().impl,
cache: createFakeCache().impl,
...(batched ? { scheduleFlush: (flush: () => void) => scheduled.push(flush) } : {}),
});
function ack(requestId: string | undefined = "r1", conversationId = "c1") {
const msg: ChatQueuedMessage = {
type: "chat.queued",
conversationId,
reason: "compaction",
messageId: "q1",
...(requestId !== undefined ? { requestId } : {}),
};
store.handleDelta(msg);
}
function event(event: AgentEvent) {
store.handleDelta({ type: "chat.delta", event });
}
function start(text?: string, turnId = "t1") {
event({ type: "turn-start", conversationId: "c1", turnId });
if (text !== undefined) event({ type: "user-message", conversationId: "c1", turnId, text });
}
return { store, transport, history, scheduled, ack, event, start };
}
describe("compaction-deferred chat.send", () => {
it.each([
"hello",
"",
])("removes just the accepted local text/images for %j without error, retry or queue sends", (text) => {
const f = fixture();
f.store.send(text, images);
expect(f.store.chunks).toHaveLength(text ? 3 : 2);
f.ack();
f.ack();
expect(f.store.chunks).toEqual([]);
expect(f.store.generating).toBe(false);
expect(f.store.error).toBeNull();
expect(f.transport.sent).toHaveLength(1);
expect(f.transport.sent[0]).toMatchObject({ requestId: "r1", images, message: text });
expect(f.transport.sentQueue).toEqual([]);
f.store.dispose();
});
it("uses distinct request identities for identical sends and preserves unrelated content", () => {
const f = fixture();
f.start("another client's prompt");
f.event({ type: "text-delta", conversationId: "c1", turnId: "t1", delta: "working" });
f.store.send("identical", images);
f.store.send("identical", images);
expect(f.transport.sent.map((m) => m.requestId)).toEqual(["r1", "r2"]);
f.ack("r1");
f.ack("r1");
expect(f.store.chunks.map((c) => c.chunk)).toEqual([
{ type: "text", text: "another client's prompt" },
{ type: "text", text: "working" },
{ type: "text", text: "identical" },
...images.map((i) => ({ type: "image", ...i })),
]);
f.ack("r2");
expect(f.store.chunks.map((c) => c.chunk)).toEqual([
{ type: "text", text: "another client's prompt" },
{ type: "text", text: "working" },
]);
expect(f.store.generating).toBe(true);
f.store.dispose();
});
it.each([
"missing",
"unknown",
"wrong-conversation",
])("tolerates %s correlation without deleting any echo", (kind) => {
const f = fixture();
f.store.send("hello", images);
f.store.handleDelta({
type: "chat.queued",
conversationId: kind === "wrong-conversation" ? "c2" : "c1",
reason: "compaction",
messageId: "q1",
...(kind === "missing" ? {} : { requestId: kind === "unknown" ? "r999" : "r1" }),
});
expect(f.store.chunks).toHaveLength(3);
expect(f.store.error).toBeNull();
f.store.dispose();
});
it.each([
false,
true,
])("preserves a live confirmed prompt before delayed ack (batched=%s)", (batched) => {
const f = fixture(batched);
f.store.send("hello", images);
f.start("hello");
f.event({ type: "text-delta", conversationId: "c1", turnId: "t1", delta: "answer" });
f.ack();
f.ack();
for (const flush of f.scheduled) flush();
expect(f.store.chunks.map((c) => c.chunk)).toEqual([
{ type: "text", text: "hello" },
{ type: "text", text: "answer" },
]);
expect(f.store.generating).toBe(true);
expect(f.store.error).toBeNull();
f.store.dispose();
});
it("turn-start tagging alone does not protect a still-local echo", () => {
const f = fixture(true);
f.store.send("hello", images);
f.start();
f.ack();
expect(f.store.chunks).toEqual([]);
expect(f.store.generating).toBe(true);
f.event({ type: "user-message", conversationId: "c1", turnId: "t1", text: "hello" });
for (const flush of f.scheduled) flush();
expect(f.store.chunks.map((c) => c.chunk)).toEqual([{ type: "text", text: "hello" }]);
f.store.dispose();
});
it("keeps a combined queue opening and steering; removes only the original individual echoes", () => {
const f = fixture(true);
f.store.send("one", images);
f.store.send("two", images);
f.start("one\n\ntwo");
f.event({ type: "steering", conversationId: "c1", turnId: "t1", text: "steer" });
f.ack("r2");
f.ack("r1");
expect(f.store.chunks.map((c) => c.chunk)).toEqual([
{ type: "text", text: "one\n\ntwo" },
{ type: "text", text: "steer" },
]);
expect(f.store.generating).toBe(true);
f.store.dispose();
});
it.each([
"ack-first",
"reset-first",
"history-first",
])("handles epoch replacement idempotently: %s", async (order) => {
const f = fixture();
await f.store.load();
f.store.send("hello", images);
if (order === "ack-first") f.ack();
f.history.historyEpoch = 1;
f.history.returnChunks = [
{ seq: 1, role: "user", turnId: "t1", chunk: { type: "text", text: "hello" } },
{ seq: 2, role: "user", turnId: "t1", chunk: { type: "image", url: "/images/c1/saved.png" } },
];
f.store.resync(1);
if (order === "reset-first") f.ack();
await vi.waitFor(() => expect(f.store.pendingSync).toBe(false));
f.start("hello");
const before = f.store.chunks;
f.ack();
f.ack();
expect(f.store.chunks).toEqual(before);
expect(f.store.chunks.map((c) => c.chunk)).toEqual(f.history.returnChunks.map((c) => c.chunk));
expect(f.store.generating).toBe(true);
expect(f.store.error).toBeNull();
expect(f.transport.sent).toHaveLength(1);
f.store.dispose();
});
it("keeps normal immediate-send text/image deduplication and authoritative history", async () => {
const f = fixture();
f.store.send("hello", images);
f.start("hello");
expect(f.store.chunks).toHaveLength(3);
f.history.returnChunks = [
{ seq: 1, role: "user", turnId: "t1", chunk: { type: "text", text: "hello" } },
{ seq: 2, role: "user", turnId: "t1", chunk: { type: "image", url: "/images/c1/saved.png" } },
];
f.event({ type: "turn-sealed", conversationId: "c1", turnId: "t1" });
await vi.waitFor(() => expect(f.store.pendingSync).toBe(false));
expect(f.store.chunks.map((c) => c.chunk)).toEqual(f.history.returnChunks.map((c) => c.chunk));
expect(f.store.chunks.every((c) => !c.provisional)).toBe(true);
expect(f.transport.sent).toHaveLength(1);
f.store.dispose();
});
});
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