Band MCP Server

import { emulatePagination, encodeCursor } from "../pagination/adapter"; describe("emulatePagination", () => { test("empty items returns empty page and no cursor", () => { const res = emulatePagination([], undefined, 10); expect(res.pageItems).toEqual([]); expect(res.nextCursor).toBeNull(); }); test("returns first page and nextCursor when more items exist", () => { const items = Array.from({ length: 25 }, (_, i) => i + 1); const res = emulatePagination(items, undefined, 10); expect(res.pageItems.length).toBe(10); expect(res.pageItems[0]).toBe(1); expect(res.nextCursor).toBeTruthy(); }); test("invalid cursor falls back to offset 0", () => { const items = [1, 2, 3, 4, 5]; const res = emulatePagination(items, "not-a-valid-cursor", 2); expect(res.pageItems).toEqual([1, 2]); expect(res.nextCursor).toBeTruthy(); }); test("cursor at end returns empty page and no nextCursor", () => { const items = [1, 2, 3]; const cursor = encodeCursor({ offset: 3 }); const res = emulatePagination(items, cursor, 5); expect(res.pageItems).toEqual([]); expect(res.nextCursor).toBeNull(); }); test("throws when upstream exceeds maxUpstream", () => { const items = Array.from({ length: 300 }, (_, i) => i); expect(() => emulatePagination(items, undefined, 10, 200)).toThrow( /exceeding maxUpstream/ ); }); });