await fs.writeFile(flaky, "notes flaky", "utf-8");

const originalStat = fsCore.promises.stat.bind(fsCore.promises);

const statSpy = vi

.spyOn(fsCore.promises, "stat")

.mockImplementation(async (target, options) => {

if (String(target) === flaky) {

throw new Error("transient stat failure");

}

return originalStat(target, options);

});

const failedStatTargets: string[] = [];

vi.spyOn(fsCore.promises, "stat").mockImplementation(async (target, options) => {

if (String(target) === flaky) {

failedStatTargets.push(String(target));

throw new Error("transient stat failure");

}

return originalStat(target, options);

});

const prelude = await buildSessionStartupContextPrelude({

workspaceDir,

nowMs: Date.UTC(2026, 3, 11, 18, 0, 0),

});

expect(statSpy).toHaveBeenCalled();

expect(failedStatTargets).toEqual([flaky]);

expect(prelude).toContain("notes readable a");

expect(prelude).toContain("notes readable b");

expect(prelude).not.toContain("notes flaky");