113 lines
3.2 KiB
JavaScript
113 lines
3.2 KiB
JavaScript
var chai = chai || require('chai');
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var should = chai.should();
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var assert = chai.assert;
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var BN = require('../lib/bn');
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describe('bn', function() {
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it('should create a bn', function() {
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var bn = new BN(50);
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should.exist(bn);
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bn.toString().should.equal('50');
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});
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it('should parse this number', function() {
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var bn = new BN(999970000);
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bn.toString().should.equal('999970000');
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});
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it('should parse numbers below and at bn.js internal word size', function() {
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var bn = new BN(Math.pow(2, 26) - 1);
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bn.toString().should.equal((Math.pow(2, 26) - 1).toString());
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var bn = new BN(Math.pow(2, 26));
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bn.toString().should.equal((Math.pow(2, 26)).toString());
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});
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describe('#add', function() {
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it('should add two small numbers together', function() {
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var bn1 = new BN(50);
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var bn2 = new BN(75);
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var bn3 = bn1.add(bn2);
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bn3.toString().should.equal('125');
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});
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});
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describe('#sub', function() {
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it('should subtract a small number', function() {
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var bn1 = new BN(50);
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var bn2 = new BN(25);
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var bn3 = bn1.sub(bn2);
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bn3.toString().should.equal('25');
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});
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});
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describe('#gt', function() {
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it('should say 1 is greater than 0', function() {
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var bn1 = new BN(1);
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var bn0 = new BN(0);
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bn1.gt(bn0).should.equal(true);
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});
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it('should say a big number is greater than a small big number', function() {
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var bn1 = new BN('24023452345398529485723980457');
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var bn0 = new BN('34098234283412341234049357');
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bn1.gt(bn0).should.equal(true);
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});
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it('should say a big number is great than a standard number', function() {
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var bn1 = new BN('24023452345398529485723980457');
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var bn0 = new BN(5);
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bn1.gt(bn0).should.equal(true);
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});
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});
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describe('#fromBuffer', function() {
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it('should work with big endian', function() {
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var bn = BN.fromBuffer(new Buffer('0001', 'hex'), {endian: 'big'});
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bn.toString().should.equal('1');
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});
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it('should work with big endian 256', function() {
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var bn = BN.fromBuffer(new Buffer('0100', 'hex'), {endian: 'big'});
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bn.toString().should.equal('256');
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});
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it('should work with little endian if we specify the size', function() {
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var bn = BN.fromBuffer(new Buffer('0100', 'hex'), {size: 2, endian: 'little'});
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bn.toString().should.equal('1');
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});
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});
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describe('#toBuffer', function() {
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it('should create a 4 byte buffer', function() {
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var bn = new BN(1);
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bn.toBuffer({size: 4}).toString('hex').should.equal('00000001');
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});
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it('should create a 4 byte buffer in little endian', function() {
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var bn = new BN(1);
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bn.toBuffer({size: 4, endian: 'little'}).toString('hex').should.equal('01000000');
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});
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it('should create a 2 byte buffer even if you ask for a 1 byte', function() {
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var bn = new BN('ff00', 16);
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bn.toBuffer({size: 1}).toString('hex').should.equal('ff00');
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});
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it('should create a 4 byte buffer even if you ask for a 1 byte', function() {
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var bn = new BN('ffffff00', 16);
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bn.toBuffer({size: 4}).toString('hex').should.equal('ffffff00');
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});
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});
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});
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