mathjs/test/type/fraction/Fraction.test.js

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.

var assert = require('assert');
var math = require('../../../index');


describe('Fraction', function () {

  it('should have a property isFraction', function () {
    var a = new math.type.Fraction(1,3);
    assert.strictEqual(a.isFraction, true);
  });

  it('should have a property type', function () {
    var a = new math.type.Fraction(1,3);
    assert.strictEqual(a.type, 'Fraction');
  });

  it('should have a valueOf method', function () {
    var a = new math.type.Fraction(1,2);
    assert.strictEqual(a.valueOf(), 0.5);
  });

  it('toJSON', function () {
    assert.deepEqual(new math.type.Fraction(0.375).toJSON(), {'mathjs': 'Fraction', n: 3, d: 8});
    assert.deepEqual(new math.type.Fraction(-0.375).toJSON(), {'mathjs': 'Fraction', n: -3, d: 8});
  });

  it('fromJSON', function () {
    var b = math.type.Fraction.fromJSON({n: 3, d: 8});
    assert.ok(b instanceof math.type.Fraction);
    assert.strictEqual(b.toString(), '0.375');

    var c = math.type.Fraction.fromJSON({n: -3, d: 8});
    assert.ok(c instanceof math.type.Fraction);
    assert.strictEqual(c.toString(), '-0.375');

    var d = math.type.Fraction.fromJSON({n: 3, d: -8});
    assert.ok(d instanceof math.type.Fraction);
    assert.strictEqual(d.toString(), '-0.375');
  });

});