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'use strict';
var should = require('chai').should();
var expect = require('chai').expect;
var bitcore = require('..');
var errors = bitcore.errors;
var Unit = bitcore.Unit;
describe('Unit', function() {
it('can be created from a number and unit', function() {
expect(function() {
return new Unit(1.2, 'BTC');
}).to.not.throw();
});
it('can be created from a number and exchange rate', function() {
expect(function() {
return new Unit(1.2, 350);
}).to.not.throw();
});
it('no "new" is required for creating an instance', function() {
expect(function() {
return Unit(1.2, 'BTC');
}).to.not.throw();
expect(function() {
return Unit(1.2, 350);
}).to.not.throw();
});
it('has property accesors "BTC", "mBTC", "uBTC", "bits", and "satoshis"', function() {
var unit = new Unit(1.2, 'BTC');
unit.BTC.should.equal(1.2);
unit.mBTC.should.equal(1200);
unit.uBTC.should.equal(1200000);
unit.bits.should.equal(1200000);
unit.satoshis.should.equal(120000000);
});
it('a string amount is allowed', function() {
var unit;
unit = Unit.fromBTC('1.00001');
unit.BTC.should.equal(1.00001);
unit = Unit.fromMilis('1.00001');
unit.mBTC.should.equal(1.00001);
unit = Unit.fromBits('100');
unit.bits.should.equal(100);
unit = Unit.fromSatoshis('8999');
unit.satoshis.should.equal(8999);
unit = Unit.fromFiat('43', 350);
unit.BTC.should.equal(0.12285714);
});
it('should have constructor helpers', function() {
var unit;
unit = Unit.fromBTC(1.00001);
unit.BTC.should.equal(1.00001);
unit = Unit.fromMilis(1.00001);
unit.mBTC.should.equal(1.00001);
unit = Unit.fromBits(100);
unit.bits.should.equal(100);
unit = Unit.fromSatoshis(8999);
unit.satoshis.should.equal(8999);
unit = Unit.fromFiat(43, 350);
unit.BTC.should.equal(0.12285714);
});
it('converts to satoshis correctly', function() {
/* jshint maxstatements: 25 */
var unit;
unit = Unit.fromBTC(1.3);
unit.mBTC.should.equal(1300);
unit.bits.should.equal(1300000);
unit.satoshis.should.equal(130000000);
unit = Unit.fromMilis(1.3);
unit.BTC.should.equal(0.0013);
unit.bits.should.equal(1300);
unit.satoshis.should.equal(130000);
unit = Unit.fromBits(1.3);
unit.BTC.should.equal(0.0000013);
unit.mBTC.should.equal(0.0013);
unit.satoshis.should.equal(130);
unit = Unit.fromSatoshis(3);
unit.BTC.should.equal(0.00000003);
unit.mBTC.should.equal(0.00003);
unit.bits.should.equal(0.03);
});
it('takes into account floating point problems', function() {
var unit = Unit.fromBTC(0.00000003);
unit.mBTC.should.equal(0.00003);
unit.bits.should.equal(0.03);
unit.satoshis.should.equal(3);
});
it('exposes unit codes', function() {
should.exist(Unit.BTC);
Unit.BTC.should.equal('BTC');
should.exist(Unit.mBTC);
Unit.mBTC.should.equal('mBTC');
should.exist(Unit.bits);
Unit.bits.should.equal('bits');
should.exist(Unit.satoshis);
Unit.satoshis.should.equal('satoshis');
});
it('exposes a method that converts to different units', function() {
var unit = new Unit(1.3, 'BTC');
unit.to(Unit.BTC).should.equal(unit.BTC);
unit.to(Unit.mBTC).should.equal(unit.mBTC);
unit.to(Unit.bits).should.equal(unit.bits);
unit.to(Unit.satoshis).should.equal(unit.satoshis);
});
it('exposes shorthand conversion methods', function() {
var unit = new Unit(1.3, 'BTC');
unit.toBTC().should.equal(unit.BTC);
unit.toMilis().should.equal(unit.mBTC);
unit.toBits().should.equal(unit.bits);
unit.toSatoshis().should.equal(unit.satoshis);
});
it('can convert to fiat', function() {
var unit = new Unit(1.3, 350);
unit.atRate(350).should.equal(1.3);
unit.to(350).should.equal(1.3);
unit = Unit.fromBTC(0.0123);
unit.atRate(10).should.equal(0.12);
});
it('toString works as expected', function() {
var unit = new Unit(1.3, 'BTC');
should.exist(unit.toString);
unit.toString().should.be.a('string');
});
it('can be imported and exported from/to JSON', function() {
var json = JSON.stringify({amount:1.3, code:'BTC'});
var unit = Unit.fromJSON(json);
unit.toJSON().should.deep.equal(json);
});
it('importing from invalid JSON fails quickly', function() {
expect(function() {
return Unit.fromJSON('¹');
}).to.throw();
});
it('inspect method displays nicely', function() {
var unit = new Unit(1.3, 'BTC');
unit.inspect().should.equal('<Unit: 130000000 satoshis>');
});
it('fails when the unit is not recognized', function() {
expect(function() {
return new Unit(100, 'USD');
}).to.throw(errors.Unit.UnknownCode);
expect(function() {
return new Unit(100, 'BTC').to('USD');
}).to.throw(errors.Unit.UnknownCode);
});
it('fails when the exchange rate is invalid', function() {
expect(function() {
return new Unit(100, -123);
}).to.throw(errors.Unit.InvalidRate);
expect(function() {
return new Unit(100, 'BTC').atRate(-123);
}).to.throw(errors.Unit.InvalidRate);
});
});