Skip jazzicons in unit tests

package.json

@@ -57,6 +57,7 @@
     "debounce": "^1.0.0",
     "deep-extend": "^0.4.1",
     "denodeify": "^1.2.1",
+    "detect-node": "^2.0.3",
     "disc": "^1.3.2",
     "dnode": "^1.2.2",
     "end-of-stream": "^1.1.0",
@@ -169,6 +170,7 @@
     "qunit": "^0.9.1",
     "react-addons-test-utils": "^15.5.1",
     "react-dom": "^15.5.4",
+    "react-test-renderer": "^15.5.4",
     "react-testutils-additions": "^15.2.0",
     "sinon": "^1.17.3",
     "tape": "^4.5.1",

ui/app/components/identicon.js

@@ -1,6 +1,7 @@
 const Component = require('react').Component
 const h = require('react-hyperscript')
 const inherits = require('util').inherits
+const isNode = require('detect-node')
 const findDOMNode = require('react-dom').findDOMNode
 const jazzicon = require('jazzicon')
 const iconFactoryGen = require('../../lib/icon-factory')
@@ -40,9 +41,11 @@ IdenticonComponent.prototype.componentDidMount = function () {
 
   var container = findDOMNode(this)
   var diameter = props.diameter || this.defaultDiameter
+  if (!isNode) {
     var img = iconFactory.iconForAddress(address, diameter, false)
     container.appendChild(img)
   }
+}
 
 IdenticonComponent.prototype.componentDidUpdate = function () {
   var props = this.props
@@ -58,6 +61,8 @@ IdenticonComponent.prototype.componentDidUpdate = function () {
   }
 
   var diameter = props.diameter || this.defaultDiameter
+  if (!isNode) {
     var img = iconFactory.iconForAddress(address, diameter, false)
     container.appendChild(img)
   }
+}