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map_values_test.ts
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map_values_test.ts
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";
import { mapValues } from "./map_values.ts";
function mapValuesTest<T, O>(
input: [Record<string, T>, (value: T) => O],
expected: Record<string, O>,
message?: string,
) {
const actual = mapValues(...input);
assertEquals(actual, expected, message);
}
Deno.test({
name: "[collections/mapValues] no mutation",
fn() {
const object = { a: 5, b: true };
mapValues(object, (it) => it ?? "nothing");
assertEquals(object, { a: 5, b: true });
},
});
Deno.test({
name: "[collections/mapValues] empty input",
fn() {
mapValuesTest(
[{}, (it) => it],
{},
);
},
});
Deno.test({
name: "[collections/mapValues] identity",
fn() {
mapValuesTest(
[
{
foo: true,
bar: "lorem",
1: -5,
},
(it) => it,
],
{
foo: true,
bar: "lorem",
1: -5,
},
);
},
});
Deno.test({
name: "[collections/mapValues] falsy values",
fn() {
mapValuesTest<number, null | undefined | string | boolean>(
[
{
"something": 0,
"yetanotherkey": 1,
"andonemore": 2,
"lastone": 3,
},
(it) => [null, undefined, "", false][it],
],
{
"something": null,
"yetanotherkey": undefined,
"andonemore": "",
"lastone": false,
},
);
},
});
Deno.test({
name: "[collections/mapValues] normal mappers",
fn() {
mapValuesTest(
[
{
"FoodFile": "/home/deno/food.txt",
"CalendarFile": "/home/deno/weekend.cal",
},
(path) => path.substr(path.lastIndexOf(".")),
],
{
"FoodFile": ".txt",
"CalendarFile": ".cal",
},
);
mapValuesTest(
[
{
"Curry": 20,
"Beans": 2,
"Rice": 3.5,
},
(price) => price.toFixed(2),
],
{
"Curry": "20.00",
"Beans": "2.00",
"Rice": "3.50",
},
);
},
});