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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { assertEquals, assertThrows } from "../testing/asserts.ts";import { chunk } from "./chunk.ts";
function chunkTest<I>(  input: [Array<I>, number],  expected: Array<Array<I>>,  message?: string,) {  const actual = chunk(...input);  assertEquals(actual, expected, message);}
const testArray = [1, 2, 3, 4, 5, 6];
Deno.test({  name: "[collections/chunk] no mutation",  fn() {    const array = [1, 2, 3, 4];    chunk(array, 2);
    assertEquals(array, [1, 2, 3, 4]);  },});
Deno.test({  name: "[collections/chunk] throws on non naturals",  fn() {    assertThrows(() => chunk([], +.5));    assertThrows(() => chunk([], -4.7));    assertThrows(() => chunk([], -2));    assertThrows(() => chunk([], +0));    assertThrows(() => chunk([], -0));  },});
Deno.test({  name: "[collections/chunk] empty input",  fn() {    chunkTest(      [[], 1],      [],    );  },});
Deno.test({  name: "[collections/chunk] single element chunks",  fn() {    chunkTest(      [testArray, 1],      testArray.map((it) => [it]),    );    chunkTest(      [["foo"], 1],      [["foo"]],    );  },});
Deno.test({  name: "[collections/chunk] n chunks fitting",  fn() {    chunkTest(      [testArray, 2],      [[1, 2], [3, 4], [5, 6]],    );    chunkTest(      [testArray, 3],      [[1, 2, 3], [4, 5, 6]],    );  },});
Deno.test({  name: "[collections/chunk] n chunks not fitting",  fn() {    chunkTest(      [testArray, 4],      [[1, 2, 3, 4], [5, 6]],    );    chunkTest(      [testArray, 5],      [[1, 2, 3, 4, 5], [6]],    );  },});
Deno.test({  name: "[collections/chunk] chunks equal to length",  fn() {    chunkTest(      [testArray, testArray.length],      [testArray],    );    chunkTest(      [["foo"], 1],      [["foo"]],    );  },});