import { appendCapped } from "./cap"

describe("appendCapped", () => {
  test("keeps all items when under max", () => {
    expect(appendCapped([1, 2], [3], 10)).toEqual([1, 2, 3])
  })

  test("drops from head when exceeding max", () => {
    expect(appendCapped([1, 2], [3, 4, 5], 3)).toEqual([3, 4, 5])
  })

  test("calls onDrop for dropped items", () => {
    const dropped: number[] = []
    const result = appendCapped([1, 2], [3, 4, 5], 3, (x) => dropped.push(x))
    expect(result).toEqual([3, 4, 5])
    expect(dropped).toEqual([1, 2])
  })
})