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import { describe, test, expect, beforeEach, afterEach } from "bun:test";
import { mkdtemp, writeFile, rm, readFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import {
saveState,
loadState,
type RunState,
} from "./session/state.js";
import { sessionDir } from "./session/index.js";
const SESSION_ID = "test-session-001";
async function makeTempDir(prefix: string): Promise<string> {
return mkdtemp(join(tmpdir(), prefix));
}
const baseRunState: RunState = {
status: "running",
turnsUsed: 3,
task: "Fix the login bug",
startedAt: 1_700_000_000_000,
};
describe("state persistence", () => {
let cwd: string;
let home: string;
beforeEach(async () => {
cwd = await makeTempDir("state-test-cwd-");
home = await makeTempDir("state-test-home-");
});
afterEach(async () => {
await rm(cwd, { recursive: true, force: true });
await rm(home, { recursive: true, force: true });
});
const dir = () => sessionDir(cwd, SESSION_ID, home);
// ---------------------------------------------------------------------------
// 1. Round-trip: save then load returns an equal object
// ---------------------------------------------------------------------------
test("saveState then loadState returns an equal RunState", async () => {
await saveState(cwd, SESSION_ID, baseRunState, home);
const loaded = await loadState(cwd, SESSION_ID, home);
expect(loaded).toEqual(baseRunState);
});
test("saveState round-trips optional fields", async () => {
const state: RunState = {
...baseRunState,
status: "done",
finishedAt: 1_700_000_005_000,
};
await saveState(cwd, SESSION_ID, state, home);
const loaded = await loadState(cwd, SESSION_ID, home);
expect(loaded).toEqual(state);
});
// ---------------------------------------------------------------------------
// 2. Missing file returns null (ENOENT mapped, no throw)
// ---------------------------------------------------------------------------
test("loadState on missing file returns null", async () => {
const result = await loadState(cwd, "nonexistent-session", home);
expect(result).toBeNull();
});
// ---------------------------------------------------------------------------
// 3. Corrupt / truncated JSON returns null rather than throwing
// ---------------------------------------------------------------------------
test("loadState with truncated JSON returns null instead of throwing", async () => {
const stateDir = dir();
const { mkdir } = await import("node:fs/promises");
await mkdir(stateDir, { recursive: true });
await writeFile(join(stateDir, "run.json"), '{ "turnsUsed": ');
const result = await loadState(cwd, SESSION_ID, home);
expect(result).toBeNull();
});
// ---------------------------------------------------------------------------
// 4. Valid JSON but wrong shape returns null via the validators
// ---------------------------------------------------------------------------
test("loadState with turnsUsed as string returns null", async () => {
const stateDir = dir();
const { mkdir } = await import("node:fs/promises");
await mkdir(stateDir, { recursive: true });
await writeFile(
join(stateDir, "run.json"),
JSON.stringify({ status: "running", turnsUsed: "not-a-number", task: "x", startedAt: 0 }),
);
const result = await loadState(cwd, SESSION_ID, home);
expect(result).toBeNull();
});
// ---------------------------------------------------------------------------
// 5. Atomic write: saveState uses temp+rename
// ---------------------------------------------------------------------------
test("saveState leaves no .tmp file after successful write", async () => {
await saveState(cwd, SESSION_ID, baseRunState, home);
const stateDir = dir();
const { readdir } = await import("node:fs/promises");
const files = await readdir(stateDir);
const temps = files.filter((f) => f.includes(".tmp"));
expect(temps).toHaveLength(0);
});
test("saveState overwrites a pre-existing file with well-formed JSON", async () => {
await saveState(cwd, SESSION_ID, baseRunState, home);
const updated: RunState = { ...baseRunState, turnsUsed: 99, status: "done" };
await saveState(cwd, SESSION_ID, updated, home);
const raw = await readFile(join(dir(), "run.json"), "utf8");
expect(() => JSON.parse(raw)).not.toThrow();
expect(JSON.parse(raw)).toEqual(updated);
});
test("saveState produces a valid final file that round-trips", async () => {
await saveState(cwd, SESSION_ID, baseRunState, home);
const raw = await readFile(join(dir(), "run.json"), "utf8");
expect(() => JSON.parse(raw)).not.toThrow();
expect(JSON.parse(raw)).toEqual(baseRunState);
});
// ---------------------------------------------------------------------------
// 6. Identity fields: model and mcpServers round-trip and validate
// ---------------------------------------------------------------------------
test("saveState round-trips model and mcpServers", async () => {
const state: RunState = {
...baseRunState,
model: "openai:gpt-5",
mcpServers: [
{ name: "linear", toolCount: 12 },
{ name: "railway", toolCount: 4 },
],
};
await saveState(cwd, SESSION_ID, state, home);
const loaded = await loadState(cwd, SESSION_ID, home);
expect(loaded).toEqual(state);
});
test("loadState accepts a record with no model or mcpServers (pre-existing sessions)", async () => {
await saveState(cwd, SESSION_ID, baseRunState, home);
const loaded = await loadState(cwd, SESSION_ID, home);
expect(loaded?.model).toBeUndefined();
expect(loaded?.mcpServers).toBeUndefined();
});
test("loadState rejects a mcpServers entry missing toolCount", async () => {
const stateDir = dir();
const { mkdir } = await import("node:fs/promises");
await mkdir(stateDir, { recursive: true });
await writeFile(
join(stateDir, "run.json"),
JSON.stringify({
status: "running",
turnsUsed: 0,
task: "x",
startedAt: 0,
mcpServers: [{ name: "linear" }],
}),
);
const result = await loadState(cwd, SESSION_ID, home);
expect(result).toBeNull();
});
});