text: 'use strict';
  
  var digicore = require('../..');
  var should = require('chai').should();
  var BufferWriter = digicore.encoding.BufferWriter;
  var BufferReader = digicore.encoding.BufferReader;
  var BN = digicore.crypto.BN;
  
  describe('BufferWriter', function() {
  
    it('should create a new buffer writer', function() {
      var bw = new BufferWriter();
      should.exist(bw);
    });
  
    describe('#set', function() {
      
      it('set bufs', function() {
        var buf1 = new Buffer([0]);
        var buf2 = new Buffer([1]);
        var bw = new BufferWriter().set({bufs: [buf1, buf2]});
        bw.concat().toString('hex').should.equal('0001');
      });
  
    });
  
    describe('#toBuffer', function() {
      
      it('should concat these two bufs', function() {
        var buf1 = new Buffer([0]);
        var buf2 = new Buffer([1]);
        var bw = new BufferWriter({bufs: [buf1, buf2]});
        bw.toBuffer().toString('hex').should.equal('0001');
      });
  
    });
  
    describe('#concat', function() {
      
      it('should concat these two bufs', function() {
        var buf1 = new Buffer([0]);
        var buf2 = new Buffer([1]);
        var bw = new BufferWriter({bufs: [buf1, buf2]});
        bw.concat().toString('hex').should.equal('0001');
      });
  
    });
  
    describe('#write', function() {
  
      it('should write a buffer', function() {
        var buf = new Buffer([0]);
        var bw = new BufferWriter();
        bw.write(buf);
        bw.concat().toString('hex').should.equal('00');
      });
  
    });
  
    describe('#writeUInt8', function() {
      
      it('should write 1', function() {
        var bw = new BufferWriter();
        bw.writeUInt8(1).concat().toString('hex').should.equal('01');
      });
  
    });
  
    describe('#writeUInt16BE', function() {
      
      it('should write 1', function() {
        var bw = new BufferWriter();
        bw.writeUInt16BE(1).concat().toString('hex').should.equal('0001');
      });
  
    });
  
    describe('#writeUInt16LE', function() {
      
      it('should write 1', function() {
        var bw = new BufferWriter();
        bw.writeUInt16LE(1).concat().toString('hex').should.equal('0100');
      });
  
    });
  
    describe('#writeUInt32BE', function() {
      
      it('should write 1', function() {
        var bw = new BufferWriter();
        bw.writeUInt32BE(1).concat().toString('hex').should.equal('00000001');
      });
  
    });
  
    describe('#writeUInt32LE', function() {
      
      it('should write 1', function() {
        var bw = new BufferWriter();
        bw.writeUInt32LE(1).concat().toString('hex').should.equal('01000000');
      });
  
    });
  
    describe('#writeUInt64BEBN', function() {
      
      it('should write 1', function() {
        var bw = new BufferWriter();
        bw.writeUInt64BEBN(new BN(1)).concat().toString('hex').should.equal('0000000000000001');
      });
  
    });
  
    describe('#writeUInt64LEBN', function() {
      
      it('should write 1', function() {
        var bw = new BufferWriter();
        bw.writeUInt64LEBN(new BN(1)).concat().toString('hex').should.equal('0100000000000000');
      });
  
    });
  
    describe('#writeVarint', function() {
      
      it('should write a 1 byte varint', function() {
        var bw = new BufferWriter();
        bw.writeVarintNum(1);
        bw.concat().length.should.equal(1);
      });
  
      it('should write a 3 byte varint', function() {
        var bw = new BufferWriter();
        bw.writeVarintNum(1000);
        bw.concat().length.should.equal(3);
      });
  
      it('should write a 5 byte varint', function() {
        var bw = new BufferWriter();
        bw.writeVarintNum(Math.pow(2, 16 + 1));
        bw.concat().length.should.equal(5);
      });
  
      it('should write a 9 byte varint', function() {
        var bw = new BufferWriter();
        bw.writeVarintNum(Math.pow(2, 32 + 1));
        bw.concat().length.should.equal(9);
      });
  
      it('should read back the same value it wrote for a 9 byte varint', function() {
        var bw = new BufferWriter();
        var n = Math.pow(2, 53);
        n.should.equal(n + 1); //javascript number precision limit
        bw.writeVarintNum(n);
        var br = new BufferReader({buf: bw.concat()});
        br.readVarintBN().toNumber().should.equal(n);
      });
  
    });
  
    describe('#writeVarintBN', function() {
      
      it('should write a 1 byte varint', function() {
        var bw = new BufferWriter();
        bw.writeVarintBN(new BN(1));
        bw.concat().length.should.equal(1);
      });
  
      it('should write a 3 byte varint', function() {
        var bw = new BufferWriter();
        bw.writeVarintBN(new BN(1000));
        bw.concat().length.should.equal(3);
      });
  
      it('should write a 5 byte varint', function() {
        var bw = new BufferWriter();
        bw.writeVarintBN(new BN(Math.pow(2, 16 + 1)));
        bw.concat().length.should.equal(5);
      });
  
      it('should write a 9 byte varint', function() {
        var bw = new BufferWriter();
        bw.writeVarintBN(new BN(Math.pow(2, 32 + 1)));
        bw.concat().length.should.equal(9);
      });
  
    });
  
  });
  