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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../assert/mod.ts";import { associateBy } from "./associate_by.ts";
function associateByTest<T>(  input: [Array<T>, (el: T) => string],  expected: { [x: string]: T },  message?: string,) {  const actual = associateBy(...input);  assertEquals(actual, expected, message);}
Deno.test({  name: "associateBy() handles no mutation",  fn() {    const arrayA = ["Foo", "Bar"];    associateBy(arrayA, (it) => it.charAt(0));
    assertEquals(arrayA, ["Foo", "Bar"]);  },});
Deno.test({  name: "associateBy() handles empty input",  fn() {    associateByTest(      [[], () => "a"],      {},    );  },});
Deno.test({  name: "associateBy() handles constant key",  fn() {    associateByTest(      [[1, 3, 5, 6], () => "a"],      { a: 6 },    );  },});
Deno.test({  name: "associateBy() handles empty key",  fn() {    associateByTest(      [        ["Foo", "b"],        (it) => it.charAt(1),      ],      {        "o": "Foo",        "": "b",      },    );  },});
Deno.test({  name: "associateBy() handles duplicate keys",  fn() {    associateByTest(      [        ["Anna", "Marija", "Karl", "Arnold", "Martha"],        (it) => it.charAt(0),      ],      {        "A": "Arnold",        "M": "Martha",        "K": "Karl",      },    );    associateByTest(      [        [1.2, 2, 2.3, 6.3, 6.9, 6],        (it) => Math.floor(it).toString(),      ],      {        "1": 1.2,        "2": 2.3,        "6": 6,      },    );  },});
Deno.test({  name: "associateBy() handles associates",  fn() {    associateByTest(      [        [          { name: "test", done: false },          { name: "build", done: true },          { name: "deploy", done: false },          { name: "audit", done: true },        ],        (it) => it.name,      ],      {        "test": { name: "test", done: false },        "build": { name: "build", done: true },        "deploy": { name: "deploy", done: false },        "audit": { name: "audit", done: true },      },    );    associateByTest(      [        [          "anna@example.org",          "josh@example.org",          "kim@example.org",        ],        (it) => it.substring(0, it.indexOf("@")),      ],      {        "anna": "anna@example.org",        "josh": "josh@example.org",        "kim": "kim@example.org",      },    );  },});