diff --git a/package.json b/package.json
index a2a6684c51..d549119332 100644
--- a/package.json
+++ b/package.json
@@ -21,13 +21,15 @@
   "devDependencies": {
     "babel-preset-react": "^6.5.0",
     "babelify": "^7.2.0",
+    "mocha": "^2.5.3",
+    "should": "^9.0.2",
     "standard": "^7.0.1",
     "standard-reporter": "^1.0.5"
   },
   "scripts": {
     "start_node": "eth --rpccorsdomain \"*\" -j -v 0",
     "build": "mkdir -p build; browserify -t [ babelify --presets [ react ] ] src/index.js -o build/app.js",
-    "test" : "standard"
+    "test": "standard && mocha"
   },
   "repository": {
     "type": "git",
diff --git a/src/codeManager.js b/src/code/codeManager.js
similarity index 94%
rename from src/codeManager.js
rename to src/code/codeManager.js
index da98f3f307..ed61b451be 100644
--- a/src/codeManager.js
+++ b/src/code/codeManager.js
@@ -1,8 +1,8 @@
 'use strict'
-var traceManagerUtil = require('./traceManagerUtil')
+var traceHelper = require('../helpers/traceHelper')
 var codeResolver = require('./codeResolver')
-var util = require('./util')
-var EventManager = require('./eventManager')
+var util = require('../helpers/global')
+var EventManager = require('../lib/eventManager')
 
 /*
   resolve contract code referenced by vmtrace in order to be used by asm listview.
@@ -42,7 +42,7 @@ CodeManager.prototype.resolveStep = function (stepIndex, tx) {
 CodeManager.prototype.ensureCodeLoaded = function (address, currentStep, tx) {
   var self = this
   if (address !== this.currentAddress) {
-    if (traceManagerUtil.isContractCreation(address)) {
+    if (traceHelper.isContractCreation(address)) {
       this.traceManager.getContractCreationCode(address, function (error, hexCode) {
         // contract creation
         if (error) {
diff --git a/src/codeResolver.js b/src/code/codeResolver.js
similarity index 100%
rename from src/codeResolver.js
rename to src/code/codeResolver.js
diff --git a/src/codeUtils.js b/src/code/codeUtils.js
similarity index 100%
rename from src/codeUtils.js
rename to src/code/codeUtils.js
diff --git a/src/opcodes.js b/src/code/opcodes.js
similarity index 100%
rename from src/opcodes.js
rename to src/code/opcodes.js
diff --git a/src/debugger.js b/src/debugger.js
index 84709b7374..8baa0b8a9a 100644
--- a/src/debugger.js
+++ b/src/debugger.js
@@ -4,8 +4,8 @@ var TxBrowser = require('./txBrowser')
 var StepManager = require('./stepManager')
 var VmDebugger = require('./vmDebugger')
 var style = require('./basicStyles')
-var util = require('./util')
-var EventManager = require('./eventManager')
+var util = require('./helpers/global')
+var EventManager = require('./lib/eventManager')
 
 module.exports = React.createClass({
   ethDebuggerSelectedItem: -1,
diff --git a/src/util.js b/src/helpers/global.js
similarity index 100%
rename from src/util.js
rename to src/helpers/global.js
diff --git a/src/helpers/init.js b/src/helpers/init.js
new file mode 100644
index 0000000000..e4c93ae891
--- /dev/null
+++ b/src/helpers/init.js
@@ -0,0 +1,19 @@
+'use strict'
+var Web3 = require('web3')
+var Web3Admin = require('../util/web3Admin')
+var TraceManager = require('../trace/traceManager')
+var CodeManager = require('../code/codeManager')
+
+module.exports = {
+  loadContext: function () {
+    var web3 = new Web3()
+    web3.setProvider(new web3.providers.HttpProvider('http://localhost:8545'))
+    Web3Admin.extend(web3)
+    var traceManager = new TraceManager(web3)
+    return {
+      web3: web3,
+      traceManager: traceManager,
+      codeManager: new CodeManager(web3, traceManager)
+    }
+  }
+}
diff --git a/src/traceManagerUtil.js b/src/helpers/traceHelper.js
similarity index 100%
rename from src/traceManagerUtil.js
rename to src/helpers/traceHelper.js
diff --git a/src/helpers/ui.js b/src/helpers/ui.js
new file mode 100644
index 0000000000..615c9959ce
--- /dev/null
+++ b/src/helpers/ui.js
@@ -0,0 +1,35 @@
+'use strict'
+module.exports = {
+  formatMemory: function (mem, width) {
+    var ret = ''
+    if (!mem) {
+      return ret
+    }
+
+    if (!mem.substr) {
+      mem = mem.join('') // geth returns an array, eth return raw string
+    }
+
+    for (var k = 0; k < mem.length; k += (width * 2)) {
+      var memory = mem.substr(k, width * 2)
+      var content = this.tryConvertAsciiFormat(memory)
+      ret += '0x' + k.toString(16) + '   ' + content.raw + ' ' + content.ascii + '\n'
+    }
+    return ret
+  },
+
+  tryConvertAsciiFormat: function (memorySlot) {
+    var ret = { ascii: '', raw: '' }
+    for (var k = 0; k < memorySlot.length; k += 2) {
+      var raw = memorySlot.substr(k, 2)
+      var ascii = String.fromCharCode(parseInt(raw, 16))
+      ascii = ascii.replace(/\W/g, '?')
+      if (ascii === '') {
+        ascii = '?'
+      }
+      ret.ascii += ascii
+      ret.raw += ' ' + raw
+    }
+    return ret
+  }
+}
diff --git a/src/index.js b/src/index.js
index 3b970a9867..a3b608a91f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,26 +1,10 @@
 'use strict'
 var ReactDOM = require('react-dom')
 var React = require('react')
-var Web3 = require('web3')
-var Web3Admin = require('./web3Admin')
-var TraceManager = require('./traceManager')
-var CodeManager = require('./codeManager')
-
-function loadContext () {
-  var web3 = new Web3()
-  web3.setProvider(new web3.providers.HttpProvider('http://localhost:8545'))
-  Web3Admin.extend(web3)
-  var traceManager = new TraceManager(web3)
-  return {
-    web3: web3,
-    traceManager: traceManager,
-    codeManager: new CodeManager(web3, traceManager)
-  }
-}
-
+var util = require('./helpers/init')
 var Debugger = require('./debugger')
 
 ReactDOM.render(
-  <Debugger context={loadContext()} />,
+  <Debugger context={util.loadContext()} />,
   document.getElementById('app')
 )
diff --git a/src/eventManager.js b/src/lib/eventManager.js
similarity index 100%
rename from src/eventManager.js
rename to src/lib/eventManager.js
diff --git a/src/memoryPanel.js b/src/memoryPanel.js
index 4a656309d2..804055ec0b 100644
--- a/src/memoryPanel.js
+++ b/src/memoryPanel.js
@@ -1,6 +1,7 @@
 'use strict'
 var React = require('react')
 var BasicPanel = require('./basicPanel')
+var util = require('./helpers/ui')
 
 module.exports = React.createClass({
   contextTypes: {
@@ -33,43 +34,10 @@ module.exports = React.createClass({
           console.log(error)
         } else if (self.context.root.ethDebuggerSelectedItem === index) {
           self.setState({
-            data: self.formatMemory(memory, 16)
+            data: util.formatMemory(memory, 16)
           })
         }
       })
     })
-  },
-
-  formatMemory: function (mem, width) {
-    var ret = ''
-    if (!mem) {
-      return ret
-    }
-
-    if (!mem.substr) {
-      mem = mem.join('') // geth returns an array, eth return raw string
-    }
-
-    for (var k = 0; k < mem.length; k += (width * 2)) {
-      var memory = mem.substr(k, width * 2)
-      var content = this.tryAsciiFormat(memory)
-      ret += this.context.web3.toHex(k) + '   ' + content.raw + ' ' + content.ascii + '\n'
-    }
-    return ret
-  },
-
-  tryAsciiFormat: function (memorySlot) {
-    var ret = { ascii: '', raw: '' }
-    for (var k = 0; k < memorySlot.length; k += 2) {
-      var raw = memorySlot.substr(k, 2)
-      var ascii = String.fromCharCode(parseInt(raw, 16))
-      ascii = ascii.replace(/\W/g, '?')
-      if (ascii === '') {
-        ascii = '?'
-      }
-      ret.ascii += ascii
-      ret.raw += ' ' + raw
-    }
-    return ret
   }
 })
diff --git a/src/traceAnalyser.js b/src/trace/traceAnalyser.js
similarity index 77%
rename from src/traceAnalyser.js
rename to src/trace/traceAnalyser.js
index 2e7f67a9c4..b482ae86d3 100644
--- a/src/traceAnalyser.js
+++ b/src/trace/traceAnalyser.js
@@ -1,5 +1,5 @@
 'use strict'
-var traceManagerUtil = require('./traceManagerUtil')
+var traceHelper = require('../helpers/traceHelper')
 
 function TraceAnalyser (_cache) {
   this.traceCache = _cache
@@ -18,7 +18,7 @@ TraceAnalyser.prototype.analyse = function (trace, tx, callback) {
     callStack: callStack.slice(0)
   })
 
-  if (traceManagerUtil.isContractCreation(tx.to)) {
+  if (traceHelper.isContractCreation(tx.to)) {
     this.traceCache.pushContractCreation(tx.to, tx.input)
   }
 
@@ -45,17 +45,17 @@ TraceAnalyser.prototype.buildMemory = function (index, step) {
 }
 
 TraceAnalyser.prototype.buildStorage = function (index, step, context) {
-  if (traceManagerUtil.newContextStorage(step)) {
-    var calledAddress = traceManagerUtil.resolveCalledAddress(index, this.trace)
+  if (traceHelper.newContextStorage(step)) {
+    var calledAddress = traceHelper.resolveCalledAddress(index, this.trace)
     if (calledAddress) {
       context.currentStorageAddress = calledAddress
     } else {
       console.log('unable to build storage changes. ' + index + ' does not match with a CALL. storage changes will be corrupted')
     }
     this.traceCache.pushStoreChanges(index + 1, context.currentStorageAddress)
-  } else if (traceManagerUtil.isSSTOREInstruction(step)) {
+  } else if (traceHelper.isSSTOREInstruction(step)) {
     this.traceCache.pushStoreChanges(index + 1, context.currentStorageAddress, step.stack[step.stack.length - 1], step.stack[step.stack.length - 2])
-  } else if (traceManagerUtil.isReturnInstruction(step)) {
+  } else if (traceHelper.isReturnInstruction(step)) {
     context.currentStorageAddress = context.previousStorageAddress
     this.traceCache.pushStoreChanges(index + 1, context.currentStorageAddress)
   }
@@ -63,14 +63,14 @@ TraceAnalyser.prototype.buildStorage = function (index, step, context) {
 }
 
 TraceAnalyser.prototype.buildDepth = function (index, step, callStack) {
-  if (traceManagerUtil.isCallInstruction(step) && !traceManagerUtil.isCallToPrecompiledContract(index, this.trace)) {
-    if (traceManagerUtil.isCreateInstruction(step)) {
-      var contractToken = traceManagerUtil.contractCreationToken(index)
+  if (traceHelper.isCallInstruction(step) && !traceHelper.isCallToPrecompiledContract(index, this.trace)) {
+    if (traceHelper.isCreateInstruction(step)) {
+      var contractToken = traceHelper.contractCreationToken(index)
       callStack.push(contractToken)
       var lastMemoryChange = this.traceCache.memoryChanges[this.traceCache.memoryChanges.length - 1]
       this.traceCache.pushContractCreationFromMemory(index, contractToken, this.trace, lastMemoryChange)
     } else {
-      var newAddress = traceManagerUtil.resolveCalledAddress(index, this.trace)
+      var newAddress = traceHelper.resolveCalledAddress(index, this.trace)
       if (newAddress) {
         callStack.push(newAddress)
       } else {
@@ -81,7 +81,7 @@ TraceAnalyser.prototype.buildDepth = function (index, step, callStack) {
     this.traceCache.pushCallStack(index + 1, {
       callStack: callStack.slice(0)
     })
-  } else if (traceManagerUtil.isReturnInstruction(step)) {
+  } else if (traceHelper.isReturnInstruction(step)) {
     callStack.pop()
     this.traceCache.pushCallChanges(step, index + 1)
     this.traceCache.pushCallStack(index + 1, {
diff --git a/src/traceCache.js b/src/trace/traceCache.js
similarity index 100%
rename from src/traceCache.js
rename to src/trace/traceCache.js
diff --git a/src/traceManager.js b/src/trace/traceManager.js
similarity index 92%
rename from src/traceManager.js
rename to src/trace/traceManager.js
index 8c33bdf6c4..f736d9afb9 100644
--- a/src/traceManager.js
+++ b/src/trace/traceManager.js
@@ -3,7 +3,7 @@ var TraceAnalyser = require('./traceAnalyser')
 var TraceRetriever = require('./traceRetriever')
 var TraceCache = require('./traceCache')
 var TraceStepManager = require('./traceStepManager')
-var traceManagerUtil = require('./traceManagerUtil')
+var traceHelper = require('../helpers/traceHelper')
 
 function TraceManager (_web3) {
   this.web3 = _web3
@@ -74,7 +74,7 @@ TraceManager.prototype.getStorageAt = function (stepIndex, tx, callback) {
   if (check) {
     return callback(check, null)
   }
-  var stoChange = traceManagerUtil.findLowerBound(stepIndex, this.traceCache.storageChanges)
+  var stoChange = traceHelper.findLowerBound(stepIndex, this.traceCache.storageChanges)
   if (stoChange === undefined) return callback('no storage found', null)
   var self = this
   if (this.traceRetriever.debugStorageAtAvailable()) {
@@ -98,7 +98,7 @@ TraceManager.prototype.getCallDataAt = function (stepIndex, callback) {
   if (check) {
     return callback(check, null)
   }
-  var callDataChange = traceManagerUtil.findLowerBound(stepIndex, this.traceCache.callDataChanges)
+  var callDataChange = traceHelper.findLowerBound(stepIndex, this.traceCache.callDataChanges)
   if (callDataChange === undefined) return callback('no calldata found', null)
   callback(null, [this.trace[callDataChange].calldata])
 }
@@ -108,7 +108,7 @@ TraceManager.prototype.getCallStackAt = function (stepIndex, callback) {
   if (check) {
     return callback(check, null)
   }
-  var callStackChange = traceManagerUtil.findLowerBound(stepIndex, this.traceCache.callChanges)
+  var callStackChange = traceHelper.findLowerBound(stepIndex, this.traceCache.callChanges)
   if (callStackChange === undefined) return callback('no callstack found', null)
   callback(null, this.traceCache.callStack[callStackChange].callStack)
 }
@@ -133,7 +133,7 @@ TraceManager.prototype.getLastCallChangeSince = function (stepIndex, callback) {
   if (check) {
     return callback(check, null)
   }
-  var callChange = traceManagerUtil.findLowerBound(stepIndex, this.traceCache.callChanges)
+  var callChange = traceHelper.findLowerBound(stepIndex, this.traceCache.callChanges)
   if (callChange === undefined) {
     callback(null, 0)
   } else {
@@ -179,7 +179,7 @@ TraceManager.prototype.getMemoryAt = function (stepIndex, callback) {
   if (check) {
     return callback(check, null)
   }
-  var lastChanges = traceManagerUtil.findLowerBound(stepIndex, this.traceCache.memoryChanges)
+  var lastChanges = traceHelper.findLowerBound(stepIndex, this.traceCache.memoryChanges)
   if (lastChanges === undefined) return callback('no memory found', null)
   callback(null, this.trace[lastChanges].memory)
 }
@@ -225,7 +225,7 @@ TraceManager.prototype.getRemainingGas = function (stepIndex, callback) {
 }
 
 TraceManager.prototype.isCreationStep = function (stepIndex) {
-  return traceManagerUtil.isCreateInstruction(stepIndex, this.trace)
+  return traceHelper.isCreateInstruction(stepIndex, this.trace)
 }
 
 // step section
diff --git a/src/traceRetriever.js b/src/trace/traceRetriever.js
similarity index 90%
rename from src/traceRetriever.js
rename to src/trace/traceRetriever.js
index 2c2956c34f..88859facbb 100644
--- a/src/traceRetriever.js
+++ b/src/trace/traceRetriever.js
@@ -1,5 +1,6 @@
 'use strict'
-var traceManagerUtil = require('./traceManagerUtil')
+var traceHelper = require('../helpers/traceHelper')
+
 function TraceRetriever (_web3) {
   this.web3 = _web3
   this.storages = {} // contains all intial storage (by addresses)
@@ -18,7 +19,7 @@ TraceRetriever.prototype.getTrace = function (txHash, callback) {
 }
 
 TraceRetriever.prototype.getStorage = function (tx, address, callback) {
-  if (traceManagerUtil.isContractCreation(address)) {
+  if (traceHelper.isContractCreation(address)) {
     callback(null, {})
   } else if (this.storages[address]) {
     callback(null, this.storages[address])
diff --git a/src/traceStepManager.js b/src/trace/traceStepManager.js
similarity index 92%
rename from src/traceStepManager.js
rename to src/trace/traceStepManager.js
index 74fb033622..5f20aa25d2 100644
--- a/src/traceStepManager.js
+++ b/src/trace/traceStepManager.js
@@ -1,5 +1,5 @@
 'use strict'
-var traceManagerUtil = require('./traceManagerUtil')
+var traceHelper = require('../helpers/traceHelper')
 
 function TraceStepManager (_traceAnalyser) {
   this.traceAnalyser = _traceAnalyser
@@ -7,12 +7,12 @@ function TraceStepManager (_traceAnalyser) {
 
 TraceStepManager.prototype.isCallInstruction = function (index) {
   var state = this.traceAnalyser.trace[index]
-  return traceManagerUtil.isCallInstruction(state)
+  return traceHelper.isCallInstruction(state)
 }
 
 TraceStepManager.prototype.isReturnInstruction = function (index) {
   var state = this.traceAnalyser.trace[index]
-  return traceManagerUtil.isReturnInstruction(state)
+  return traceHelper.isReturnInstruction(state)
 }
 
 TraceStepManager.prototype.findStepOverBack = function (currentStep) {
diff --git a/src/txBrowser.js b/src/txBrowser.js
index f4ff916b9a..945ed8c552 100644
--- a/src/txBrowser.js
+++ b/src/txBrowser.js
@@ -1,7 +1,7 @@
 'use strict'
 var React = require('react')
 var style = require('./basicStyles')
-var traceManagerUtil = require('./traceManagerUtil')
+var traceHelper = require('./helpers/traceHelper')
 
 module.exports = React.createClass({
   contextTypes: {
@@ -31,7 +31,7 @@ module.exports = React.createClass({
     }
     if (tx) {
       if (!tx.to) {
-        tx.to = traceManagerUtil.contractCreationToken('0')
+        tx.to = traceHelper.contractCreationToken('0')
       }
       this.setState({from: tx.from, to: tx.to, hash: tx.hash})
       this.props.onNewTxRequested(this.state.blockNumber, parseInt(this.state.txNumber), tx)
diff --git a/src/web3Admin.js b/src/util/web3Admin.js
similarity index 100%
rename from src/web3Admin.js
rename to src/util/web3Admin.js
diff --git a/test/index.js b/test/index.js
new file mode 100644
index 0000000000..1542d841f9
--- /dev/null
+++ b/test/index.js
@@ -0,0 +1,12 @@
+/* global describe it*/
+var should = require('should')
+
+var init = require('../src/helpers/init')
+describe('index', function () {
+  describe('loadContext', function () {
+    it('web3', function () {
+      var context = init.loadContext()
+      should.exist(context.web3)
+    })
+  })
+})