32 lines
1.0 KiB
TypeScript
32 lines
1.0 KiB
TypeScript
import { expect, it } from "vitest";
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import { PageHeights } from "../src/lib/virt";
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it("估算高度:offset/total/pageAt/range(带 overscan、夹边)", () => {
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const ph = new PageHeights(10, 100);
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expect(ph.offset(3)).toBe(300);
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expect(ph.total()).toBe(1000);
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expect(ph.pageAt(350)).toBe(3);
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expect(ph.pageAt(-10)).toBe(0);
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expect(ph.pageAt(99_999)).toBe(9);
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expect(ph.range(0, 100, 2)).toEqual([0, 3]);
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expect(ph.range(950, 100, 2)).toEqual([7, 10]);
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});
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it("set 修正高度并平移后续 offset;返回增量;幂等", () => {
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const ph = new PageHeights(10, 100);
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expect(ph.set(2, 150)).toBe(50);
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expect(ph.offset(2)).toBe(200); // 自身 offset 不受自己影响
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expect(ph.offset(3)).toBe(350); // 后续整体 +50
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expect(ph.total()).toBe(1050);
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expect(ph.pageAt(349)).toBe(2);
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expect(ph.pageAt(351)).toBe(3);
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expect(ph.set(2, 150)).toBe(0);
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});
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it("n=0 时一切归空", () => {
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const ph = new PageHeights(0, 100);
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expect(ph.total()).toBe(0);
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expect(ph.range(0, 100, 2)).toEqual([0, 0]);
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expect(ph.set(0, 50)).toBe(0);
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});
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