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random_test.ts
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random_test.ts
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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { assertSpyCall, assertSpyCalls, returnsNext, stub } from "../mock.ts";
import { assertEquals } from "../asserts.ts";
import { _internals, randomMultiple } from "./random.ts";
Deno.test("randomMultiple uses randomInt to generate random multiples between -10 and 10 times the value", () => {
const randomIntStub = stub(_internals, "randomInt", returnsNext([-3, 3]));
try {
assertEquals(randomMultiple(5), -15);
assertEquals(randomMultiple(5), 15);
} finally {
// unwraps the randomInt method on the _internals object
randomIntStub.restore();
}
// asserts that randomIntStub was called at least once and details about the first call.
assertSpyCall(randomIntStub, 0, {
args: [-10, 10],
returned: -3,
});
// asserts that randomIntStub was called at least twice and details about the second call.
assertSpyCall(randomIntStub, 1, {
args: [-10, 10],
returned: 3,
});
// asserts that randomIntStub was only called twice.
assertSpyCalls(randomIntStub, 2);
});