text: var assert = require('assert'),
      math = require('../../../index')(),
      approx = require('../../../tools/approx'),
      number = math.number;
  
  describe('number', function() {
  
    it('should be 0 if called with no argument', function() {
      approx.equal(number(), 0);
    });
  
    it('should convert a boolean to a number', function() {
      approx.equal(number(true), 1);
      approx.equal(number(false), 0);
    });
  
    it('should convert a bignumber to a number', function() {
      approx.equal(number(math.bignumber(0.1)), 0.1);
      approx.equal(number(math.bignumber('1.3e500')), Infinity);
    });
  
    it('should accept a number as argument', function() {
      approx.equal(number(3), 3);
      approx.equal(number(-3), -3);
    });
  
    it('should parse the string if called with a valid string', function() {
      approx.equal(number('2.1e3'), 2100);
      approx.equal(number(' 2.1e-3 '), 0.0021);
      approx.equal(number(''), 0);
      approx.equal(number(' '), 0);
    });
  
    it('should throw an error if called with an invalid string', function() {
      assert.throws(function () {number('2.3.4')}, SyntaxError);
      assert.throws(function () {number('23a')}, SyntaxError);
    });
  
    it('should convert the elements of a matrix to numbers', function() {
      assert.deepEqual(number(math.matrix(['123',true])), new math.type.Matrix([123, 1]));
    });
  
    it('should convert the elements of an array to numbers', function() {
      assert.deepEqual(number(['123',true]), [123, 1]);
    });
  
    it('should throw an error if called with a wrong number of arguments', function() {
      assert.throws(function () {number(1,2)}, math.error.ArgumentsError);
      assert.throws(function () {number(1,2,3)}, math.error.ArgumentsError);
    });
  
    it('should throw an error if called with a complex number', function() {
      assert.throws(function () {number(math.complex(2,3))}, TypeError);
    });
  
    it('should throw an error if called with a unit', function() {
      assert.throws(function () {number(math.unit('5cm'))}, TypeError);
    });
  });
  
  