old_contents: var should = require('chai').should();
  var KDF = require('../lib/kdf');
  var Hash = require('../lib/hash');
  
  describe('KDF', function() {
    
    describe('#buf2keypair', function() {
  
      it('should compute these known values', function() {
        var buf = Hash.sha256(new Buffer('test'));
        var keypair = KDF.buf2keypair(buf);
        keypair.privkey.toString().should.equal('KxxVszVMFLGzmxpxR7sMSaWDmqMKLVhKebX5vZbGHyuR8spreQ7V');
        keypair.pubkey.toString().should.equal('03774f761ae89a0d2fda0d532bad62286ae8fcda9bc38c060036296085592a97c1');
      });
  
    });
  
    describe('#sha256hmac2keypair', function() {
  
      it('should compute these known values', function() {
        var buf = Hash.sha256(new Buffer('test'));
        var keypair = KDF.sha256hmac2keypair(buf);
        keypair.privkey.toString().should.equal('KxxVszVMFLGzmxpxR7sMSaWDmqMKLVhKebX5vZbGHyuR8spreQ7V');
        keypair.pubkey.toString().should.equal('03774f761ae89a0d2fda0d532bad62286ae8fcda9bc38c060036296085592a97c1');
      });
  
    });
  
    describe('#sha256hmac2privkey', function() {
  
      it('should compute this known privkey', function() {
        var buf = Hash.sha256(new Buffer('test'));
        var privkey = KDF.sha256hmac2privkey(buf);
        privkey.toString().should.equal('KxxVszVMFLGzmxpxR7sMSaWDmqMKLVhKebX5vZbGHyuR8spreQ7V');
      });
  
    });
  
  });
  
new_contents: 'use strict';
  
  var should = require('chai').should();
  var bitcore = require('bitcore');
  var KDF = bitcore.KDF;
  var Hash = bitcore.Hash;
  
  describe('KDF', function() {
  
    describe('#buf2keypair', function() {
  
      it('should compute these known values', function() {
        var buf = Hash.sha256(new Buffer('test'));
        var keypair = KDF.buf2keypair(buf);
        keypair.privkey.toString().should.equal('KxxVszVMFLGzmxpxR7sMSaWDmqMKLVhKebX5vZbGHyuR8spreQ7V');
        keypair.pubkey.toString().should.equal('03774f761ae89a0d2fda0d532bad62286ae8fcda9bc38c060036296085592a97c1');
      });
  
    });
  
    describe('#sha256hmac2keypair', function() {
  
      it('should compute these known values', function() {
        var buf = Hash.sha256(new Buffer('test'));
        var keypair = KDF.sha256hmac2keypair(buf);
        keypair.privkey.toString().should.equal('KxxVszVMFLGzmxpxR7sMSaWDmqMKLVhKebX5vZbGHyuR8spreQ7V');
        keypair.pubkey.toString().should.equal('03774f761ae89a0d2fda0d532bad62286ae8fcda9bc38c060036296085592a97c1');
      });
  
    });
  
    describe('#sha256hmac2privkey', function() {
  
      it('should compute this known privkey', function() {
        var buf = Hash.sha256(new Buffer('test'));
        var privkey = KDF.sha256hmac2privkey(buf);
        privkey.toString().should.equal('KxxVszVMFLGzmxpxR7sMSaWDmqMKLVhKebX5vZbGHyuR8spreQ7V');
      });
  
    });
  
  });
  
subject: fix tests for kdf