29 wiersze
765 B
TypeScript
29 wiersze
765 B
TypeScript
import { Random } from "./random";
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describe("choice()", () => {
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it("works", () => {
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expect(new Random().choice([1])).toBe(1);
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expect(new Random(134).choice([1, 5, 9, 7])).toBe(5);
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});
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it("throws an error if passed an empty array", () => {
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expect(() => new Random().choice([])).toThrow(
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/Cannot choose randomly from an empty array/
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);
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});
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});
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describe("uniqueChoices()", () => {
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it("works", () => {
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expect(new Random(3).uniqueChoices([1, 2, 3], 2)).toEqual([1, 3]);
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});
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it("returns fewer choices than asked if necessary", () => {
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expect(new Random().uniqueChoices([1, 1, 1], 5)).toEqual([1]);
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});
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it("returns an empty array if needed", () => {
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expect(new Random().uniqueChoices([], 5)).toEqual([]);
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});
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});
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