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master @ 29 LINES
 
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import { describe, expect, it } from "vitest";
import { paginationItems, type PageItem } from "./Pagination";

const render = (items: PageItem[]) =>
  items.map((it) => (it.kind === "gap" ? "..." : it.current ? `[${it.n}]` : String
(it.n))).join(" ");

describe("paginationItems", () => {
  it("windows around the current page with edge pages pinned", () => {
    expect(render(paginationItems(6, 20))).toBe("1 ... 4 5 [6] 7 8 ... 20");
  });

  it("collapses gaps that would hide a single page", () => {
    expect(render(paginationItems(4, 20))).toBe("1 2 3 [4] 5 6 ... 20");
  });

  it("handles the first and last pages", () => {
    expect(render(paginationItems(1, 20))).toBe("[1] 2 3 4 5 ... 20");
    expect(render(paginationItems(20, 20))).toBe("1 ... 16 17 18 19 [20]");
  });

  it("shows every page when total fits the window", () => {
    expect(render(paginationItems(2, 4))).toBe("1 [2] 3 4");
  });

  it("clamps out-of-range current pages", () => {
    expect(render(paginationItems(99, 3))).toBe("1 2 [3]");
  });
});


import { describe, expect, it } from "vitest
";
import { paginationItems, type PageItem } fr
om "./Pagination";

const render = (items: PageItem[]) =>
  items.map((it) => (it.kind === "gap" ? "..
." : it.current ? `[${it.n}]` : String(it.n)
)).join(" ");

describe("paginationItems", () => {
  it("windows around the current page with e
dge pages pinned", () => {
    expect(render(paginationItems(6, 20))).t
oBe("1 ... 4 5 [6] 7 8 ... 20");
  });

  it("collapses gaps that would hide a singl
e page", () => {
    expect(render(paginationItems(4, 20))).t
oBe("1 2 3 [4] 5 6 ... 20");
  });

  it("handles the first and last pages", () 
=> {
    expect(render(paginationItems(1, 20))).t
oBe("[1] 2 3 4 5 ... 20");
    expect(render(paginationItems(20, 20))).
toBe("1 ... 16 17 18 19 [20]");
  });

  it("shows every page when total fits the w
indow", () => {
    expect(render(paginationItems(2, 4))).to
Be("1 [2] 3 4");
  });

  it("clamps out-of-range current pages", ()
 => {
    expect(render(paginationItems(99, 3))).t
oBe("1 2 [3]");
  });
});

 
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