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find_single_test.ts
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find_single_test.ts
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "@std/assert";
import { findSingle } from "./find_single.ts";
function findSingleTest<I>(
input: [Array<I>, (element: I) => boolean],
expected: I | undefined,
message?: string,
) {
const actual = findSingle(...input);
assertEquals(actual, expected, message);
}
Deno.test({
name: "findSingle() handles no mutation",
fn() {
const array = [1, 2, 3];
findSingle(array, (it) => it % 2 === 0);
assertEquals(array, [1, 2, 3]);
},
});
Deno.test({
name: "findSingle() handles empty input",
fn() {
findSingleTest(
[[], (_) => true],
undefined,
);
},
});
Deno.test({
name: "findSingle() handles only one element",
fn() {
findSingleTest(
[[42], (_it) => true],
42,
);
findSingleTest(
[["foo"], (_it) => true],
"foo",
);
findSingleTest(
[[null], (_it) => true],
null,
);
findSingleTest(
[[undefined], (_it) => true],
undefined,
);
},
});
Deno.test({
name: "findSingle() handles no matches",
fn() {
findSingleTest(
[[9, 11, 13], (it) => it % 2 === 0],
undefined,
);
findSingleTest(
[["foo", "bar"], (it) => it.startsWith("z")],
undefined,
);
findSingleTest(
[[{ done: false }], (it) => it.done],
undefined,
);
},
});
Deno.test({
name: "findSingle() handles only match",
fn() {
findSingleTest(
[[9, 12, 13], (it) => it % 2 === 0],
12,
);
findSingleTest(
[["zap", "foo", "bar"], (it) => it.startsWith("z")],
"zap",
);
findSingleTest(
[[{ done: false }, { done: true }], (it) => it.done],
{ done: true },
);
},
});
Deno.test({
name: "findSingle() handles multiple matches",
fn() {
findSingleTest(
[[9, 12, 13, 14], (it) => it % 2 === 0],
undefined,
);
findSingleTest(
[["zap", "foo", "bar", "zee"], (it) => it.startsWith("z")],
undefined,
);
},
});