mathjs/test/function/arithmetic/cube.test.js

// test cube
var assert = require('assert'),
    math = require('../../../index'),
    error = require('../../../lib/error/index'),
    unit = math.unit,
    bignumber = math.bignumber,
    matrix = math.matrix,
    range = math.range,
    cube = math.cube;

describe('cube', function() {
  it('should return the cube of a boolean', function () {
    assert.equal(cube(true), 1);
    assert.equal(cube(false), 0);
  });

  it('should return the cube of null', function () {
    assert.equal(math.ceil(null), 0);
  });

  it('should return the cube of a number', function() {
    assert.equal(cube(4), 64);
    assert.equal(cube(-2), -8);
    assert.equal(cube(0), 0);
  });

  it('should return the cube of a big number', function() {
    assert.deepEqual(cube(bignumber(4)), bignumber(64));
    assert.deepEqual(cube(bignumber(-2)), bignumber(-8));
    assert.deepEqual(cube(bignumber(0)), bignumber(0));
  });

  it('should return the cube of a complex number', function() {
    assert.deepEqual(cube(math.complex('2i')), math.complex('-8i'));
    assert.deepEqual(cube(math.complex('2+3i')), math.complex('-46+9i'));
    assert.deepEqual(cube(math.complex('2')), math.complex('8'));
  });

  it('should throw an error with strings', function() {
    assert.throws(function () {cube('text')});
  });

  it('should throw an error with units', function() {
    assert.throws(function () {cube(unit('5cm'))});
  });

  it('should throw an error if there\'s wrong number of args', function() {
    assert.throws(function () {cube()}, error.ArgumentsError);
    assert.throws(function () {cube(1, 2)}, error.ArgumentsError);
  });

  it('should cube each element in a matrix, array or range', function() {
    // array, matrix, range
    // arrays are evaluated element wise
    assert.deepEqual(cube([2,3,4,5]), [8,27,64,125]);
    assert.deepEqual(cube(matrix([2,3,4,5])), matrix([8,27,64,125]));
    assert.deepEqual(cube(matrix([[1,2],[3,4]])), matrix([[1,8],[27,64]]));
  });

});