typed-utilities/src/__tests__/range.test.ts

Strongly typed general purpose utilities

import { inRange, range } from "..";

test(`range`, () => {
  const r1 = range(0);
  expect(r1).toEqual([]);
  expect(() => range(-1)).toThrow();
  expect(() => range(0.5)).toThrow();
  const r2 = range(5);
  expect(r2).toEqual([0, 1, 2, 3, 4]);
});

test(`inRange`, () => {
  expect(inRange(0, [-Infinity, +Infinity])).toBe(true);
  expect(inRange(0, [+Infinity, -Infinity])).toBe(false);
  expect(inRange(1, [1, Infinity])).toBe(true);
  expect(inRange(0, [1, Infinity])).toBe(false);
});