text: var assert     = require('assert');
  var utils      = require('./testutils');
  var BigInteger = require('../src/js/jsbn/jsbn').BigInteger;
  var Amount     = utils.load_module('amount').Amount;
  var UInt160    = utils.load_module('uint160').UInt160;
  var config     = utils.get_config();
  
  describe('Amount', function() {
    describe('Negatives', function() {
      it('Number 1', function () {
        assert.strictEqual(Amount.from_human('0').add(Amount.from_human('-1')).to_human(), '-1');
      });
    });
    describe('Positives', function() {
      it('Number 1', function() {
        assert(Amount.from_json('1').is_positive());
      });
    });
    describe('from_human', function() {
      it('1 XRP', function() {
        assert.strictEqual(Amount.from_human("1 XRP").to_text_full(), '1/XRP');
      });
      it('0.1 XRP', function() {
        assert.strictEqual(Amount.from_human("0.1 XRP").to_text_full(), '0.1/XRP');
      });
      it('0.1 USD', function() {
        assert.strictEqual(Amount.from_human("0.1 USD").to_text_full(), '0.1/USD/NaN');
      });
    });
    describe('from_json', function() {
      it('1 XRP', function() {
        assert.strictEqual(Amount.from_json("1/XRP").to_text_full(), "1/XRP/NaN");
      });
    });
    describe('from_number', function() {
      it('Number 1', function() {
        assert.strictEqual(Amount.from_number(1).to_text_full(), '1/1/rrrrrrrrrrrrrrrrrrrrBZbvji');
      });
      it('Number 2', function() {
        assert.strictEqual(Amount.from_number(2).to_text_full(), '2/1/rrrrrrrrrrrrrrrrrrrrBZbvji');
      });
      it('Multiply 2 "1" with 3 "1", by product_human', function () {
        assert.strictEqual(Amount.from_number(2).product_human(Amount.from_number(3)).to_text_full(), '6/1/rrrrrrrrrrrrrrrrrrrrBZbvji');
      });
      it('Multiply 3 USD with 3 "1"', function () {
        assert.strictEqual(Amount.from_json('3/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_number(3)).to_text_full(), '9/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh');
      });
      it('Multiply -1 "1" with 3 USD', function () {
        assert.strictEqual(Amount.from_number(-1).multiply(Amount.from_json('3/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full(), '-3/1/rrrrrrrrrrrrrrrrrrrrBZbvji');
      });
      it('Multiply -1 "1" with 3 USD, by product_human', function () {
        assert.strictEqual(Amount.from_number(-1).product_human(Amount.from_json('3/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full(), '-3/1/rrrrrrrrrrrrrrrrrrrrBZbvji');
      });
    });
    describe('text_full_rewrite', function() {
      it('Number 1', function() {
        assert.strictEqual('0.000001/XRP', Amount.text_full_rewrite(1));
      });
    });
    describe('json_rewrite', function() {
      it('Number 1', function() {
        assert.strictEqual('1', Amount.json_rewrite(1));
      });
    });
    describe('UInt160', function() {
      it('Parse 0', function () {
        assert.deepEqual(new BigInteger(), UInt160.from_generic('0')._value);
      });
      it('Parse 0 export', function () {
        assert.strictEqual(UInt160.ACCOUNT_ZERO, UInt160.from_generic('0').set_version(0).to_json());
      });
      it('Parse 1', function () {
        assert.deepEqual(new BigInteger([1]), UInt160.from_generic('1')._value);
      });
      it('Parse rrrrrrrrrrrrrrrrrrrrrhoLvTp export', function () {
        assert.strictEqual(UInt160.ACCOUNT_ZERO, UInt160.from_json('rrrrrrrrrrrrrrrrrrrrrhoLvTp').to_json());
      });
      it('Parse rrrrrrrrrrrrrrrrrrrrBZbvji export', function () {
        assert.strictEqual(UInt160.ACCOUNT_ONE, UInt160.from_json('rrrrrrrrrrrrrrrrrrrrBZbvji').to_json());
      });
      it('Parse mtgox export', function () {
        assert.strictEqual(config.accounts['mtgox'].account, UInt160.from_json('mtgox').to_json());
      });
      it('is_valid rrrrrrrrrrrrrrrrrrrrrhoLvTp', function () {
        assert(UInt160.is_valid('rrrrrrrrrrrrrrrrrrrrrhoLvTp'));
      });
      it('!is_valid rrrrrrrrrrrrrrrrrrrrrhoLvT', function () {
        assert(!UInt160.is_valid('rrrrrrrrrrrrrrrrrrrrrhoLvT'));
      });
    });
    describe('Amount validity', function() {
      it('is_valid 1', function() {
        assert(Amount.is_valid(1));
      });
      it('is_valid "1"', function() {
        assert(Amount.is_valid('1'));
      });
      it('is_valid "1/XRP"', function() {
        assert(Amount.is_valid('1/XRP'));
      });
      it('!is_valid NaN', function() {
        assert(!Amount.is_valid(NaN));
      });
      it('!is_valid "xx"', function() {
        assert(!Amount.is_valid('xx'));
      });
      it('!is_valid_full 1', function() {
        assert(!Amount.is_valid_full(1));
      });
      it('is_valid_full "1/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL"', function() {
        assert(Amount.is_valid_full('1/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL'));
      });
    });
    describe('Amount parsing', function() {
      it('Parse invalid string', function() {
        assert.strictEqual(Amount.from_json('x').to_text(), '0');
        assert.strictEqual(typeof Amount.from_json('x').to_text(true), 'number');
        assert(isNaN(Amount.from_json('x').to_text(true)));
      });
      it('Parse 800/USD/mtgox', function () {
        assert.strictEqual('800/USD/'+config.accounts['mtgox'].account, Amount.from_json('800/USD/mtgox').to_text_full());
      });
      it('Parse native 0', function () {
        assert.strictEqual('0/XRP', Amount.from_json('0').to_text_full());
      });
      it('Parse native 0.0', function () {
        assert.strictEqual('0/XRP', Amount.from_json('0.0').to_text_full());
      });
      it('Parse native -0', function () {
        assert.strictEqual('0/XRP', Amount.from_json('-0').to_text_full());
      });
      it('Parse native -0.0', function () {
        assert.strictEqual('0/XRP', Amount.from_json('-0.0').to_text_full());
      });
      it('Parse native 1000', function () {
        assert.strictEqual('0.001/XRP', Amount.from_json('1000').to_text_full());
      });
      it('Parse native 12.3', function () {
        assert.strictEqual('12.3/XRP', Amount.from_json('12.3').to_text_full());
      });
      it('Parse native -12.3', function () {
        assert.strictEqual('-12.3/XRP', Amount.from_json('-12.3').to_text_full());
      });
      it('Parse 123./USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', function () {
        assert.strictEqual('123/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('123./USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').to_text_full());
      });
      it('Parse 12300/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', function () {
        assert.strictEqual('12300/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('12300/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').to_text_full());
      });
      it('Parse 12.3/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', function () {
        assert.strictEqual('12.3/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('12.3/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').to_text_full());
      });
      it('Parse 1.2300/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', function () {
        assert.strictEqual('1.23/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('1.2300/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').to_text_full());
      });
      it('Parse -0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', function () {
        assert.strictEqual('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('-0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').to_text_full());
      });
      it('Parse -0.0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', function () {
        assert.strictEqual('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('-0.0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').to_text_full());
      });
      it('Parse 0.0/111/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', function () {
        assert.strictEqual('0/111/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('0/111/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').to_text_full());
      });
      it('Parse 0.0/12D/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', function () {
        assert.strictEqual('0/XRP/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('0/12D/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').to_text_full());
      });
    });
    describe('Amount operations', function() {
      it('Negate native 123', function () {
        assert.strictEqual('-0.000123/XRP', Amount.from_json('123').negate().to_text_full());
      });
      it('Negate native -123', function () {
        assert.strictEqual('0.000123/XRP', Amount.from_json('-123').negate().to_text_full());
      });
      it('Negate non-native 123', function () {
        assert.strictEqual('-123/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('123/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').negate().to_text_full());
      });
      it('Negate non-native -123', function () {
        assert.strictEqual('123/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('-123/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').negate().to_text_full());
      });
      it('Clone non-native -123', function () {
        assert.strictEqual('-123/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('-123/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').clone().to_text_full());
      });
      it('Add XRP to XRP', function () {
        assert.strictEqual('0.0002/XRP', Amount.from_json('150').add(Amount.from_json('50')).to_text_full());
      });
      it('Add USD to USD', function () {
        assert.strictEqual('200.52/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('150.02/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').add(Amount.from_json('50.5/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Add 0 USD to 1 USD', function() {
        assert.strictEqual('1' , Amount.from_json('1/USD').add('0/USD').to_text());
      });
      it('Subtract USD from USD', function() {
        assert.strictEqual('99.52/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('150.02/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').subtract(Amount.from_json('50.5/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply 0 XRP with 0 XRP', function () {
        assert.strictEqual('0/XRP', Amount.from_json('0').multiply(Amount.from_json('0')).to_text_full());
      });
      it('Multiply 0 USD with 0 XRP', function () {
        assert.strictEqual('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_json('0')).to_text_full());
      });
      it('Multiply 0 XRP with 0 USD', function () {
        assert.strictEqual('0/XRP', Amount.from_json('0').multiply(Amount.from_json('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply 1 XRP with 0 XRP', function () {
        assert.strictEqual('0/XRP', Amount.from_json('1').multiply(Amount.from_json('0')).to_text_full());
      });
      it('Multiply 1 USD with 0 XRP', function () {
        assert.strictEqual('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('1/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_json('0')).to_text_full());
      });
      it('Multiply 1 XRP with 0 USD', function () {
        assert.strictEqual('0/XRP', Amount.from_json('1').multiply(Amount.from_json('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply 0 XRP with 1 XRP', function () {
        assert.strictEqual('0/XRP', Amount.from_json('0').multiply(Amount.from_json('1')).to_text_full());
      });
      it('Multiply 0 USD with 1 XRP', function () {
        assert.strictEqual('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_json('1')).to_text_full());
      });
      it('Multiply 0 XRP with 1 USD', function () {
        assert.strictEqual('0/XRP', Amount.from_json('0').multiply(Amount.from_json('1/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply XRP with USD', function () {
        assert.equal('0.002/XRP', Amount.from_json('200').multiply(Amount.from_json('10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply XRP with USD', function () {
        assert.strictEqual('0.2/XRP', Amount.from_json('20000').multiply(Amount.from_json('10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply XRP with USD', function () {
        assert.strictEqual('20/XRP', Amount.from_json('2000000').multiply(Amount.from_json('10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply XRP with USD, neg', function () {
        assert.strictEqual('-0.002/XRP', Amount.from_json('200').multiply(Amount.from_json('-10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply XRP with USD, neg, frac', function () {
        assert.strictEqual('-0.222/XRP', Amount.from_json('-6000').multiply(Amount.from_json('37/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply USD with USD', function () {
        assert.strictEqual('20000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('2000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_json('10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply USD with USD', function () {
        assert.strictEqual('200000000000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('2000000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_json('100000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply EUR with USD, result < 1', function () {
        assert.strictEqual('100000/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_json('1000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply EUR with USD, neg', function () {
        assert.strictEqual('-48000000/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('-24000/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_json('2000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply EUR with USD, neg, <1', function () {
        assert.strictEqual('-100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('0.1/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_json('-1000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply EUR with XRP, factor < 1', function () {
        assert.strictEqual('100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('0.05/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_json('2000')).to_text_full());
      });
      it('Multiply EUR with XRP, neg', function () {
        assert.strictEqual('-500/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('-100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_json('5')).to_text_full());
      });
      it('Multiply EUR with XRP, neg, <1', function () {
        assert.strictEqual('-100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('-0.05/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').multiply(Amount.from_json('2000')).to_text_full());
      });
      it('Multiply XRP with XRP', function () {
        assert.strictEqual('0.0001/XRP', Amount.from_json('10').multiply(Amount.from_json('10')).to_text_full());
      });
      it('Divide XRP by USD', function () {
        assert.strictEqual('0.00002/XRP', Amount.from_json('200').divide(Amount.from_json('10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Divide XRP by USD', function () {
        assert.strictEqual('0.002/XRP', Amount.from_json('20000').divide(Amount.from_json('10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Divide XRP by USD', function () {
        assert.strictEqual('0.2/XRP', Amount.from_json('2000000').divide(Amount.from_json('10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Divide XRP by USD, neg', function () {
        assert.strictEqual('-0.00002/XRP', Amount.from_json('200').divide(Amount.from_json('-10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Divide XRP by USD, neg, frac', function () {
        assert.strictEqual('-0.000162/XRP', Amount.from_json('-6000').divide(Amount.from_json('37/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Divide USD by USD', function () {
        assert.strictEqual('200/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('2000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').divide(Amount.from_json('10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Divide USD by USD, fractional', function () {
        assert.strictEqual('57142.85714285714/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('2000000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').divide(Amount.from_json('35/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Divide USD by USD', function () {
        assert.strictEqual('20/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('2000000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').divide(Amount.from_json('100000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Divide EUR by USD, factor < 1', function () {
        assert.strictEqual('0.1/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').divide(Amount.from_json('1000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Divide EUR by USD, neg', function () {
        assert.strictEqual('-12/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('-24000/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').divide(Amount.from_json('2000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Divide EUR by USD, neg, <1', function () {
        assert.strictEqual('-0.1/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').divide(Amount.from_json('-1000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Divide EUR by XRP, result < 1', function () {
        assert.strictEqual('0.05/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').divide(Amount.from_json('2000')).to_text_full());
      });
      it('Divide EUR by XRP, neg', function () {
        assert.strictEqual('-20/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('-100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').divide(Amount.from_json('5')).to_text_full());
      });
      it('Divide EUR by XRP, neg, <1', function () {
        assert.strictEqual('-0.05/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('-100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').divide(Amount.from_json('2000')).to_text_full());
      });
      it('Divide by zero should throw', function() {
        assert.throws(function() {
          Amount.from_json(1).divide(Amount.from_json(0));
        });
      });
      it('Divide zero by number', function() {
        assert.strictEqual('0', Amount.from_json(0).divide(Amount.from_json(1)).to_text());
      });
      it('Divide invalid by number', function() {
        assert.throws(function() {
          Amount.from_json('x').divide(Amount.from_json('1'));
        });
      });
      it('Divide number by invalid', function() {
        assert.throws(function() {
          Amount.from_json('1').divide(Amount.from_json('x'));
        });
      });
      it('amount.abs -1 == 1', function() {
        assert.strictEqual('1', Amount.from_json(-1).abs().to_text());
      });
      it('amount.copyTo native', function() {
        assert(isNaN(Amount.from_json('x').copyTo(new Amount())._value));
      });
      it('amount.copyTo zero', function() {
        assert(!(Amount.from_json(0).copyTo(new Amount())._is_negative))
      });
    });
    describe('Amount comparisons', function() {
      it('0 USD == 0 USD amount.equals string argument', function() {
        var a = '0/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL';
        assert(Amount.from_json(a).equals(a));
      });
      it('0 USD == 0 USD', function () {
        var a = Amount.from_json('0/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('0/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        assert(a.equals(b));
        assert(!a.not_equals_why(b));
      });
      it('0 USD == -0 USD', function () {
        var a = Amount.from_json('0/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('-0/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        assert(a.equals(b));
        assert(!a.not_equals_why(b));
      });
      it('0 XRP == 0 XRP', function () {
        var a = Amount.from_json('0');
        var b = Amount.from_json('0.0');
        assert(a.equals(b));
        assert(!a.not_equals_why(b));
      });
      it('0 XRP == -0 XRP', function () {
        var a = Amount.from_json('0');
        var b = Amount.from_json('-0');
        assert(a.equals(b));
        assert(!a.not_equals_why(b));
      });
      it('10 USD == 10 USD', function () {
        var a = Amount.from_json('10/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('10/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        assert(a.equals(b));
        assert(!a.not_equals_why(b));
      });
      it('123.4567 USD == 123.4567 USD', function () {
        var a = Amount.from_json('123.4567/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('123.4567/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        assert(a.equals(b));
        assert(!a.not_equals_why(b));
      });
      it('10 XRP == 10 XRP', function () {
        var a = Amount.from_json('10');
        var b = Amount.from_json('10');
        assert(a.equals(b));
        assert(!a.not_equals_why(b));
      });
      it('1.1 XRP == 1.1 XRP', function () {
        var a = Amount.from_json('1.1');
        var b = Amount.from_json('11.0').ratio_human(10);
        assert(a.equals(b));
        assert(!a.not_equals_why(b));
      });
      it('0 USD == 0 USD (ignore issuer)', function () {
        var a = Amount.from_json('0/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('0/USD/rH5aWQJ4R7v4Mpyf4kDBUvDFT5cbpFq3XP');
        assert(a.equals(b, true));
        assert(!a.not_equals_why(b, true));
      });
      it('1.1 USD == 1.10 USD (ignore issuer)', function () {
        var a = Amount.from_json('1.1/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('1.10/USD/rH5aWQJ4R7v4Mpyf4kDBUvDFT5cbpFq3XP');
        assert(a.equals(b, true));
        assert(!a.not_equals_why(b, true));
      });
      // Exponent mismatch
      it('10 USD != 100 USD', function () {
        var a = Amount.from_json('10/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('100/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        assert(!a.equals(b));
        assert.strictEqual(a.not_equals_why(b), 'Non-XRP value differs.');
      });
      it('10 XRP != 100 XRP', function () {
        var a = Amount.from_json('10');
        var b = Amount.from_json('100');
        assert(!a.equals(b));
        assert.strictEqual(a.not_equals_why(b), 'XRP value differs.');
      });
      // Mantissa mismatch
      it('1 USD != 2 USD', function () {
        var a = Amount.from_json('1/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('2/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        assert(!a.equals(b));
        assert.strictEqual(a.not_equals_why(b), 'Non-XRP value differs.');
      });
      it('1 XRP != 2 XRP', function () {
        var a = Amount.from_json('1');
        var b = Amount.from_json('2');
        assert(!a.equals(b));
        assert.strictEqual(a.not_equals_why(b), 'XRP value differs.');
      });
      it('0.1 USD != 0.2 USD', function () {
        var a = Amount.from_json('0.1/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('0.2/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        assert(!a.equals(b));
        assert.strictEqual(a.not_equals_why(b), 'Non-XRP value differs.');
      });
      // Sign mismatch
      it('1 USD != -1 USD', function () {
        var a = Amount.from_json('1/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('-1/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        assert(!a.equals(b));
        assert.strictEqual(a.not_equals_why(b), 'Non-XRP sign differs.');
      });
      it('1 XRP != -1 XRP', function () {
        var a = Amount.from_json('1');
        var b = Amount.from_json('-1');
        assert(!a.equals(b));
        assert.strictEqual(a.not_equals_why(b), 'XRP sign differs.');
      });
      it('1 USD != 1 USD (issuer mismatch)', function () {
        var a = Amount.from_json('1/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('1/USD/rH5aWQJ4R7v4Mpyf4kDBUvDFT5cbpFq3XP');
        assert(!a.equals(b));
        assert.strictEqual(a.not_equals_why(b), 'Non-XRP issuer differs: rH5aWQJ4R7v4Mpyf4kDBUvDFT5cbpFq3XP/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
      });
      it('1 USD != 1 EUR', function () {
        var a = Amount.from_json('1/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('1/EUR/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        assert(!a.equals(b));
        assert.strictEqual(a.not_equals_why(b), 'Non-XRP currency differs.');
      });
      it('1 USD != 1 XRP', function () {
        var a = Amount.from_json('1/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        var b = Amount.from_json('1');
        assert(!a.equals(b));
        assert.strictEqual(a.not_equals_why(b), 'Native mismatch.');
      });
      it('1 XRP != 1 USD', function () {
        var a = Amount.from_json('1');
        var b = Amount.from_json('1/USD/rNDKeo9RrCiRdfsMG8AdoZvNZxHASGzbZL');
        assert(!a.equals(b));
        assert.strictEqual(a.not_equals_why(b), 'Native mismatch.');
      });
    });
  
    describe('product_human', function() {
      it('Multiply 0 XRP with 0 XRP', function () {
        assert.strictEqual('0/XRP', Amount.from_json('0').product_human(Amount.from_json('0')).to_text_full());
      });
      it('Multiply 0 USD with 0 XRP', function () {
        assert.strictEqual('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').product_human(Amount.from_json('0')).to_text_full());
      });
      it('Multiply 0 XRP with 0 USD', function () {
        assert.strictEqual('0/XRP', Amount.from_json('0').product_human(Amount.from_json('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply 1 XRP with 0 XRP', function () {
        assert.strictEqual('0/XRP', Amount.from_json('1').product_human(Amount.from_json('0')).to_text_full());
      });
      it('Multiply 1 USD with 0 XRP', function () {
        assert.strictEqual('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('1/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').product_human(Amount.from_json('0')).to_text_full());
      });
      it('Multiply 1 XRP with 0 USD', function () {
        assert.strictEqual('0/XRP', Amount.from_json('1').product_human(Amount.from_json('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply 0 XRP with 1 XRP', function () {
        assert.strictEqual('0/XRP', Amount.from_json('0').product_human(Amount.from_json('1')).to_text_full());
      });
      it('Multiply 0 USD with 1 XRP', function () {
        assert.strictEqual('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('0/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').product_human(Amount.from_json('1')).to_text_full());
      });
      it('Multiply 0 XRP with 1 USD', function () {
        assert.strictEqual('0/XRP', Amount.from_json('0').product_human(Amount.from_json('1/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply XRP with USD', function () {
        assert.equal('0.002/XRP', Amount.from_json('200').product_human(Amount.from_json('10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply XRP with USD', function () {
        assert.strictEqual('0.2/XRP', Amount.from_json('20000').product_human(Amount.from_json('10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply XRP with USD', function () {
        assert.strictEqual('20/XRP', Amount.from_json('2000000').product_human(Amount.from_json('10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply XRP with USD, neg', function () {
        assert.strictEqual('-0.002/XRP', Amount.from_json('200').product_human(Amount.from_json('-10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply XRP with USD, neg, frac', function () {
        assert.strictEqual('-0.222/XRP', Amount.from_json('-6000').product_human(Amount.from_json('37/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply USD with USD', function () {
        assert.strictEqual('20000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('2000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').product_human(Amount.from_json('10/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply USD with USD', function () {
        assert.strictEqual('200000000000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('2000000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').product_human(Amount.from_json('100000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply EUR with USD, result < 1', function () {
        assert.strictEqual('100000/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh', Amount.from_json('100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').product_human(Amount.from_json('1000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full());
      });
      it('Multiply EUR with USD, neg', function () {
        assert.strictEqual(Amount.from_json('-24000/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').product_human(Amount.from_json('2000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full(), '-48000000/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh');
      });
      it('Multiply EUR with USD, neg, <1', function () {
        assert.strictEqual(Amount.from_json('0.1/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').product_human(Amount.from_json('-1000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh')).to_text_full(), '-100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh');
      });
      it('Multiply EUR with XRP, factor < 1', function () {
        assert.strictEqual(Amount.from_json('0.05/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').product_human(Amount.from_json('2000')).to_text_full(), '0.0001/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh');
      });
      it('Multiply EUR with XRP, neg', function () {
        assert.strictEqual(Amount.from_json('-100/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').product_human(Amount.from_json('5')).to_text_full(), '-0.0005/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh');
      });
      it('Multiply EUR with XRP, neg, <1', function () {
        assert.strictEqual(Amount.from_json('-0.05/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').product_human(Amount.from_json('2000')).to_text_full(), '-0.0001/EUR/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh');
      });
      it('Multiply XRP with XRP', function () {
        assert.strictEqual(Amount.from_json('10000000').product_human(Amount.from_json('10')).to_text_full(), '0.0001/XRP');
      });
      it('Multiply USD with XAU (dem)', function () {
        assert.strictEqual(Amount.from_json('2000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').product_human(Amount.from_json('10/015841551A748AD2C1F76FF6ECB0CCCD00000000/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh'), {reference_date: 443845330 + 31535000}).to_text_full(), '19900.00316303882/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh');
      });
    });
  
    describe('ratio_human', function() {
      it('Divide USD by XAU (dem)', function () {
        assert.strictEqual(Amount.from_json('2000/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').ratio_human(Amount.from_json('10/015841551A748AD2C1F76FF6ECB0CCCD00000000/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh'), {reference_date: 443845330 + 31535000}).to_text_full(), '201.0049931765529/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh');
      });
    });
  
    describe('_invert', function() {
      it('Invert 1', function () {
        assert.strictEqual(Amount.from_json('1/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').invert().to_text_full(), '1/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh');
      });
      it('Invert 20', function () {
        assert.strictEqual(Amount.from_json('20/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').invert().to_text_full(), '0.05/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh');
      });
      it('Invert 0.02', function () {
        assert.strictEqual(Amount.from_json('0.02/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh').invert().to_text_full(), '50/USD/rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh');
      });
    });
  
    describe('from_quality', function() {
      it('BTC/XRP', function () {
        assert.strictEqual(Amount.from_quality('7B73A610A009249B0CC0D4311E8BA7927B5A34D86634581C5F0FF9FF678E1000', 'XRP', NaN, {base_currency: 'BTC'}).to_text_full(), '44,970/XRP');
      });
      it('BTC/XRP inverse', function () {
        assert.strictEqual(Amount.from_quality('37AAC93D336021AE94310D0430FFA090F7137C97D473488C4A0918D0DEF8624E', 'XRP', NaN, {inverse: true, base_currency: 'BTC'}).to_text_full(), '39,053.954453/XRP');
      });
      it('XRP/USD', function () {
        assert.strictEqual(Amount.from_quality('DFA3B6DDAB58C7E8E5D944E736DA4B7046C30E4F460FD9DE4D05DCAA8FE12000', 'USD', 'rvYAfWj5gh67oV6fW32ZzP3Aw4Eubs59B', {base_currency: 'XRP'}).to_text_full(), '0.0165/USD/rvYAfWj5gh67oV6fW32ZzP3Aw4Eubs59B');
      });
      it('XRP/USD inverse', function () {
        assert.strictEqual(Amount.from_quality('4627DFFCFF8B5A265EDBD8AE8C14A52325DBFEDAF4F5C32E5C22A840E27DCA9B', 'USD', 'rvYAfWj5gh67oV6fW32ZzP3Aw4Eubs59B', {inverse: true, base_currency: 'XRP'}).to_text_full(), '0.010251/USD/rvYAfWj5gh67oV6fW32ZzP3Aw4Eubs59B');
      });
      it('BTC/USD', function () {
        assert.strictEqual(Amount.from_quality('6EAB7C172DEFA430DBFAD120FDC373B5F5AF8B191649EC9858038D7EA4C68000', 'USD', 'rvYAfWj5gh67oV6fW32ZzP3Aw4Eubs59B', {base_currency: 'BTC'}).to_text_full(), '1000/USD/rvYAfWj5gh67oV6fW32ZzP3Aw4Eubs59B');
      });
      it('BTC/USD inverse', function () {
        assert.strictEqual(Amount.from_quality('20294C923E80A51B487EB9547B3835FD483748B170D2D0A455071AFD498D0000', 'USD', 'rvYAfWj5gh67oV6fW32ZzP3Aw4Eubs59B', {inverse: true, base_currency: 'BTC'}).to_text_full(), '0.5/USD/rvYAfWj5gh67oV6fW32ZzP3Aw4Eubs59B');
      });
      it('XAU(dem)/XRP', function () {
        assert.strictEqual(Amount.from_quality('587322CCBDE0ABD01704769A73A077C32FB39057D813D4165F1FF973CAF997EF', 'XRP', NaN, {base_currency: '015841551A748AD2C1F76FF6ECB0CCCD00000000', reference_date: 443845330 + 31535000}).to_text_full(), '90,452.246928/XRP');
      });
      it('XAU(dem)/XRP inverse', function () {
        assert.strictEqual(Amount.from_quality('F72C7A9EAE4A45ED1FB547AD037D07B9B965C6E662BEBAFA4A03F2A976804235', 'XRP', NaN, {inverse: true, base_currency: '015841551A748AD2C1F76FF6ECB0CCCD00000000', reference_date: 443845330 + 31535000}).to_text_full(), '90,442.196677/XRP');
      });
      it('USD/XAU(dem)', function () {
        assert.strictEqual(Amount.from_quality('4743E58E44974B325D42FD2BB683A6E36950F350EE46DD3A521B644B99782F5F', '015841551A748AD2C1F76FF6ECB0CCCD00000000', 'rUyPiNcSFFj6uMR2gEaD8jUerQ59G1qvwN', {base_currency: 'USD', reference_date: 443845330 + 31535000}).to_text_full(), '0.007710100231303007/XAU (-0.5%pa)/rUyPiNcSFFj6uMR2gEaD8jUerQ59G1qvwN');
      });
      it('USD/XAU(dem) inverse', function () {
        assert.strictEqual(Amount.from_quality('CDFD3AFB2F8C5DBEF75B081F7C957FF5509563266F28F36C5704A0FB0BAD8800', '015841551A748AD2C1F76FF6ECB0CCCD00000000', 'rUyPiNcSFFj6uMR2gEaD8jUerQ59G1qvwN', {inverse: true, base_currency: 'USD', reference_date: 443845330 + 31535000}).to_text_full(), '0.007675186123263489/XAU (-0.5%pa)/rUyPiNcSFFj6uMR2gEaD8jUerQ59G1qvwN');
      });
    });
  });
  