const messages = [userMessage("hello"), bedrockAssistant([], "error")];

const out = normalizeAssistantReplayContent(messages);

expect(out).not.toBe(messages);

expect(out).toHaveLength(1);

expect(out[0]).toBe(messages[0]);

expect(out).toStrictEqual([messages[0]]);

});

it("drops a trailing zero-usage empty stop assistant turn (#77228)", () => {

const falseSuccessStop = bedrockAssistant([], "stop");

const messages = [userMessage("hello"), falseSuccessStop];

const out = normalizeAssistantReplayContent(messages);

expect(out).toHaveLength(1);

expect(out[0]).toBe(messages[0]);

expect(out).toStrictEqual([messages[0]]);

});

it("drops a trailing assistant turn that already carries the persisted sentinel content (#77228)", () => {

const persistedSentinel = bedrockAssistant([{ type: "text", text: FALLBACK_TEXT }], "error");

const messages = [userMessage("hello"), persistedSentinel];

const out = normalizeAssistantReplayContent(messages);

expect(out).toHaveLength(1);

expect(out[0]).toBe(messages[0]);

expect(out).toStrictEqual([messages[0]]);

});

it("drops several consecutive trailing sentinel/empty-error turns at the tail", () => {

);

const messages = [userMessage("hi"), persistedZeroUsageSentinel];

const out = normalizeAssistantReplayContent(messages);

expect(out).toHaveLength(1);

expect(out[0]).toBe(messages[0]);

expect(out).toStrictEqual([messages[0]]);

});

});