optimize PrivateKey with cache

test/test.performance.js

@@ -0,0 +1,51 @@
+'use strict';
+
+var chai = chai || require('chai');
+var should = chai.should();
+
+var WebRTC = require('../js/models/network/WebRTC');
+var Insight = require('../js/models/blockchain/Insight');
+var FakeStorage = require('./mocks/FakeStorage');
+var PrivateKey = require('../js/models/core/PrivateKey');
+
+var WalletFactory = typeof copay === 'undefined' ? require('soop').load('../js/models/core/WalletFactory',{
+  Network: WebRTC,
+  Blockchain: Insight,
+  Storage: FakeStorage,
+}) : copay.WalletFactory;
+
+
+describe('Performance tests', function() {
+  var config = {
+    wallet: {
+      requiredCopayers: 1,
+      totalCopayers: 1,
+      spendUnconfirmed: 1,
+    },
+    networkName: 'testnet',
+  };
+
+  describe('PrivateKey', function() {
+    it('should optimize BIP32 private key gen time with cache', function() {
+      var k1 = new PrivateKey();
+      var generateN = 25;
+      var generated = [];
+      var start1 = new Date().getTime();
+      for (var i=0; i<generateN; i++) {
+        var k = JSON.stringify(k1.get(i, false).storeObj());
+        generated.push(k);
+      }
+      var delta1 = new Date().getTime() - start1;
+      var backup = k1.toObj();
+      var k2 = new PrivateKey(backup);
+      var start2 = new Date().getTime();
+      for (var i=0; i<generateN; i++) {
+        var k = JSON.stringify(k2.get(i, false).storeObj());
+        generated[i].should.equal(k);
+      }
+      var delta2 = new Date().getTime() - start2;
+      delta2.should.be.below(delta1);
+    });
+  });
+
+});