/
distinct_test.ts
58 lines (49 loc) · 1.28 KB
/
distinct_test.ts
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";
import { distinct } from "./distinct.ts";
function distinctTest<I>(
input: Array<I>,
expected: Array<I>,
message?: string,
) {
const actual = distinct(input);
assertEquals(actual, expected, message);
}
Deno.test({
name: "[collections/distinct] identities on empty array",
fn() {
distinctTest([], []);
},
});
Deno.test({
name: "[collections/distinct] removes duplicates and preserves order",
fn() {
distinctTest(
[true, "asdf", 4, "asdf", true],
[true, "asdf", 4],
);
distinctTest(
[null, undefined, null, "foo", undefined],
[null, undefined, "foo"],
);
distinctTest(
[true, "asdf", 4, "asdf", true],
[true, "asdf", 4],
);
},
});
Deno.test({
name: "[collections/distinct] does not check for deep equality",
fn() {
const objects = [{ foo: "bar" }, { foo: "bar" }];
distinctTest(objects, objects);
const arrays = [[], []];
distinctTest(arrays, arrays);
const nans = [NaN, NaN];
distinctTest(nans, [nans[0]]);
const noops = [() => {}, () => {}];
distinctTest(noops, noops);
const sets = [new Set(), new Set()];
distinctTest(sets, sets);
},
});