@technobuddha/library/src/compare.test.ts

A large library of useful functions

import { compare } from './compare.ts';

describe('compare', () => {
  test('should compare strings', () => {
    expect(compare('a', 'a')).toBe(0);
    expect(compare('a', 'b')).toBe(-1);
    expect(compare('b', 'a')).toBe(1);
  });

  test('should compare numbers', () => {
    expect(compare(0, 0)).toBe(0);
    expect(compare(0, 1)).toBe(-1);
    expect(compare(1, 0)).toBe(1);
  });

  test('should coerce boolean to number', () => {
    expect(compare(false, false)).toBe(0);
    expect(compare(false, true)).toBe(-1);
    expect(compare(true, false)).toBe(1);

    expect(compare(false, 0)).toBe(0);
    expect(compare(0, true)).toBe(-1);
    expect(compare(true, 0)).toBe(1);
  });

  test('should coerce object to number', () => {
    expect(compare(new Date(1900, 1, 0), new Date(1900, 1, 0))).toBe(0);
    expect(compare(new Date(1900, 1, 0), new Date(1999, 1, 0))).toBe(-1);
    expect(compare(new Date(1999, 1, 0), new Date(1900, 1, 0))).toBe(1);

    expect(compare(new Date(1900, 1, 0), -2206378800000)).toBe(0);
    expect(compare(-2206378800000, new Date(1999, 1, 0))).toBe(-1);
    expect(compare(new Date(1999, 1, 0), -2206378800000)).toBe(1);
  });

  test('should compare undefined', () => {
    expect(compare(undefined, undefined)).toBe(0);
    expect(compare(undefined, 0)).toBe(-1);
    expect(compare(0, undefined)).toBe(1);
  });

  test('should compare null', () => {
    expect(compare(null, null)).toBe(0);
    expect(compare(null, 0)).toBe(-1);
    expect(compare(0, null)).toBe(1);
  });

  test('should compare NaN', () => {
    expect(compare(Number.NaN, Number.NaN)).toBe(0);
    expect(compare(Number.NaN, 0)).toBe(-1);
    expect(compare(0, Number.NaN)).toBe(1);
  });
});