/
group_by_test.ts
87 lines (79 loc) · 1.57 KB
/
group_by_test.ts
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";
import { groupBy } from "./group_by.ts";
function groupByTest<T>(
input: [Array<T>, (el: T) => string],
expected: { [x: string]: Array<T> },
message?: string,
) {
const actual = groupBy(...input);
assertEquals(actual, expected, message);
}
Deno.test({
name: "[collections/groupBy] no mutation",
fn() {
const arrayA = [1.1, 4.2, 4.5];
groupBy(arrayA, () => "test");
assertEquals(arrayA, [1.1, 4.2, 4.5]);
},
});
Deno.test({
name: "[collections/groupBy] empty input",
fn() {
groupByTest(
[[], () => "a"],
{},
);
},
});
Deno.test({
name: "[collections/groupBy] constant key",
fn() {
groupByTest(
[[1, 3, 5, 6], () => "a"],
{ a: [1, 3, 5, 6] },
);
},
});
Deno.test({
name: "[collections/groupBy] empty key",
fn() {
groupByTest(
[
["Foo", "b"],
(it) => it.charAt(1),
],
{
"o": ["Foo"],
"": ["b"],
},
);
},
});
Deno.test({
name: "[collections/groupBy] groups",
fn() {
groupByTest(
[
["Anna", "Marija", "Karl", "Arnold", "Martha"],
(it) => it.charAt(0),
],
{
"A": ["Anna", "Arnold"],
"M": ["Marija", "Martha"],
"K": ["Karl"],
},
);
groupByTest(
[
[1.2, 2, 2.3, 6.3, 6.9, 6],
(it) => Math.floor(it).toString(),
],
{
"1": [1.2],
"2": [2, 2.3],
"6": [6.3, 6.9, 6],
},
);
},
});