import { describe, expect, it } from "vitest"; import { estimateTimelineMessageHeight } from "./timelineHeight"; describe("estimateTimelineMessageHeight", () => {  it("uses assistant sizing rules for assistant messages", () => {    expect(      estimateTimelineMessageHeight({        role: "assistant",        text: "a".repeat(144),      }),    ).toBe(122);  });   it("uses assistant sizing rules for system messages", () => {    expect(      estimateTimelineMessageHeight({        role: "system",        text: "a".repeat(144),      }),    ).toBe(122);  });   it("adds one attachment row for one or two user attachments", () => {    expect(      estimateTimelineMessageHeight({        role: "user",        text: "hello",        attachments: [{ id: "1" }],      }),    ).toBe(346);     expect(      estimateTimelineMessageHeight({        role: "user",        text: "hello",        attachments: [{ id: "1" }, { id: "2" }],      }),    ).toBe(346);  });   it("adds a second attachment row for three or four user attachments", () => {    expect(      estimateTimelineMessageHeight({        role: "user",        text: "hello",        attachments: [{ id: "1" }, { id: "2" }, { id: "3" }],      }),    ).toBe(574);     expect(      estimateTimelineMessageHeight({        role: "user",        text: "hello",        attachments: [{ id: "1" }, { id: "2" }, { id: "3" }, { id: "4" }],      }),    ).toBe(574);  });   it("does not cap long user message estimates", () => {    expect(      estimateTimelineMessageHeight({        role: "user",        text: "a".repeat(56 * 120),      }),    ).toBe(2736);  });   it("counts explicit newlines for user message estimates", () => {    expect(      estimateTimelineMessageHeight({        role: "user",        text: "first\nsecond\nthird",      }),    ).toBe(162);  });   it("uses narrower width to increase user line wrapping", () => {    const message = {      role: "user" as const,      text: "a".repeat(52),    };     expect(estimateTimelineMessageHeight(message, { timelineWidthPx: 320 })).toBe(140);    expect(estimateTimelineMessageHeight(message, { timelineWidthPx: 768 })).toBe(118);  });   it("does not clamp user wrapping too aggressively on very narrow layouts", () => {    const message = {      role: "user" as const,      text: "a".repeat(20),    };     expect(estimateTimelineMessageHeight(message, { timelineWidthPx: 100 })).toBe(184);    expect(estimateTimelineMessageHeight(message, { timelineWidthPx: 320 })).toBe(118);  });   it("uses narrower width to increase assistant line wrapping", () => {    const message = {      role: "assistant" as const,      text: "a".repeat(200),    };     expect(estimateTimelineMessageHeight(message, { timelineWidthPx: 320 })).toBe(188);    expect(estimateTimelineMessageHeight(message, { timelineWidthPx: 768 })).toBe(122);  });});