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Created September 9, 2020 09:16
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README.md

Testing randomness in Deno

Run tests

deno test random.test.ts

Run tests with seeded random (ensure same sequence for Math.random)

deno test random.test.ts --seed 100
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random.test.ts
import { assertEquals } from "https://deno.land/x/[email protected]/testing/asserts.ts";
function randomFrom<T>(list: T[]): T {
const r = Math.floor(Math.random() * list.length);
return list[r];
}
Deno.test("random results", () => {
const list = [1, 2, 3, 4, 5];
const results = [
randomFrom(list),
randomFrom(list),
randomFrom(list),
];
// seeded random (seed = 100)
assertEquals(results, [5, 5, 1]);
});
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antaranyan commented Sep 9, 2020

Assertion library reports pretty output with diffs
image

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