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import type { StoredChunk } from "@dispatch/wire";
import { describe, expect, it } from "vitest";
import { createConversationCache } from "./cache";
import type { ConversationCacheIndexEntry, ConversationChunkStore } from "./types";
const chunk = (seq: number, role: "user" | "assistant" = "user"): StoredChunk => ({
seq,
role,
chunk: { type: "text", text: `chunk-${seq}` },
});
/**
* In-memory fake ConversationChunkStore — the ONLY allowed fake.
* An outermost edge: simulates the storage port without any real I/O.
*/
function createFakeStore(): ConversationChunkStore {
const store = new Map<string, StoredChunk[]>();
return {
async load(conversationId) {
return store.get(conversationId) ?? [];
},
async append(conversationId, chunks) {
const existing = store.get(conversationId) ?? [];
const existingSeqs = new Set(existing.map((c) => c.seq));
const toAdd = chunks.filter((c) => !existingSeqs.has(c.seq));
store.set(
conversationId,
[...existing, ...toAdd].sort((a, b) => a.seq - b.seq),
);
},
async delete(conversationId) {
store.delete(conversationId);
},
async index() {
const entries: ConversationCacheIndexEntry[] = [];
for (const [id, chunks] of store) {
if (chunks.length === 0) continue;
let maxSeq = 0;
for (const c of chunks) {
if (c.seq > maxSeq) maxSeq = c.seq;
}
entries.push({
conversationId: id,
chunkCount: chunks.length,
maxSeq,
});
}
return entries;
},
};
}
describe("cache.load", () => {
it("returns stored chunks", async () => {
const store = createFakeStore();
const cache = createConversationCache(store);
await store.append("conv-1", [chunk(1), chunk(2)]);
const result = await cache.load("conv-1");
expect(result).toEqual([chunk(1), chunk(2)]);
});
it("returns empty array for absent conversation", async () => {
const store = createFakeStore();
const cache = createConversationCache(store);
const result = await cache.load("nonexistent");
expect(result).toEqual([]);
});
});
describe("cache.commit", () => {
it("appends only new chunks", async () => {
const store = createFakeStore();
const cache = createConversationCache(store);
await store.append("conv-1", [chunk(1), chunk(2)]);
const merged = await cache.commit("conv-1", [chunk(2), chunk(3)]);
expect(merged).toEqual([chunk(1), chunk(2), chunk(3)]);
// Verify store has all chunks
const stored = await store.load("conv-1");
expect(stored).toEqual([chunk(1), chunk(2), chunk(3)]);
});
it("returns full merged result", async () => {
const store = createFakeStore();
const cache = createConversationCache(store);
const merged = await cache.commit("conv-1", [chunk(3), chunk(1)]);
expect(merged).toEqual([chunk(1), chunk(3)]);
});
it("is idempotent — re-committing same chunks is a no-op", async () => {
const store = createFakeStore();
const cache = createConversationCache(store);
await cache.commit("conv-1", [chunk(1), chunk(2)]);
const merged = await cache.commit("conv-1", [chunk(1), chunk(2)]);
expect(merged).toEqual([chunk(1), chunk(2)]);
const stored = await store.load("conv-1");
expect(stored).toEqual([chunk(1), chunk(2)]);
});
});
describe("cache.sinceSeq", () => {
it("returns max seq from cache", async () => {
const store = createFakeStore();
const cache = createConversationCache(store);
await store.append("conv-1", [chunk(1), chunk(5), chunk(3)]);
expect(await cache.sinceSeq("conv-1")).toBe(5);
});
it("returns 0 for empty conversation", async () => {
const store = createFakeStore();
const cache = createConversationCache(store);
expect(await cache.sinceSeq("conv-1")).toBe(0);
});
});
describe("cache.evictIfOverBudget", () => {
it("deletes selected conversations", async () => {
const store = createFakeStore();
const cache = createConversationCache(store, { maxChunks: 5 });
await store.append("a", [chunk(1), chunk(2)]);
await store.append("b", [chunk(1), chunk(2)]);
await store.append("c", [chunk(1)]);
// Total = 5, max = 5, under budget
const evicted = await cache.evictIfOverBudget(null);
expect(evicted).toEqual([]);
// Add more to go over budget
await store.append("d", [chunk(1), chunk(2), chunk(3)]);
// Total = 8, max = 5, need to evict 3+ chunks
const evicted2 = await cache.evictIfOverBudget(null);
expect(evicted2.length).toBeGreaterThan(0);
// Verify evicted conversations are deleted
for (const id of evicted2) {
expect(await store.load(id)).toEqual([]);
}
});
it("never evicts the active conversation", async () => {
const store = createFakeStore();
const cache = createConversationCache(store, { maxChunks: 3 });
await store.append("active", [chunk(1), chunk(2), chunk(3)]);
await store.append("other", [chunk(1), chunk(2)]);
// Total = 5, max = 3, need to evict 2+ chunks
const evicted = await cache.evictIfOverBudget("active");
expect(evicted).not.toContain("active");
expect(evicted).toContain("other");
});
it("returns empty when under budget", async () => {
const store = createFakeStore();
const cache = createConversationCache(store, { maxChunks: 100 });
await store.append("a", [chunk(1)]);
await store.append("b", [chunk(1)]);
const evicted = await cache.evictIfOverBudget(null);
expect(evicted).toEqual([]);
});
});
describe("cache.delete", () => {
it("removes the conversation from the store", async () => {
const store = createFakeStore();
const cache = createConversationCache(store);
await store.append("conv-1", [chunk(1), chunk(2)]);
await cache.delete("conv-1");
const stored = await store.load("conv-1");
expect(stored).toEqual([]);
});
it("then load returns []", async () => {
const store = createFakeStore();
const cache = createConversationCache(store);
await cache.commit("conv-1", [chunk(1), chunk(2), chunk(3)]);
await cache.delete("conv-1");
const result = await cache.load("conv-1");
expect(result).toEqual([]);
});
});
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