Themr breaks shouldComponentUpdate shallow equal optimization

Add failing test for javivelasco#25

Author: istarkov

package.json

@@ -39,11 +39,14 @@
     "eslint-plugin-babel": "^3.2.0",
     "eslint-plugin-react": "^5.0.1",
     "expect": "^1.18.0",
+    "fbjs": "^0.8.4",
     "jsdom": "^8.4.0",
     "mocha": "^2.4.5",
     "react": "^15.0.1",
     "react-addons-test-utils": "^15.0.1",
-    "rimraf": "^2.5.2"
+    "react-dom": "^15.3.2",
+    "rimraf": "^2.5.2",
+    "sinon": "^1.17.6"
   },
   "files": [
     "lib",

test/components/themr.spec.js

@@ -1,6 +1,9 @@
 import expect from 'expect'
 import React, { Children, PropTypes, Component } from 'react'
 import TestUtils from 'react-addons-test-utils'
+import sinon from 'sinon'
+import { render } from 'react-dom'
+import shallowEqual from 'fbjs/lib/shallowEqual'
 import { themr } from '../../src/index'
 
 describe('Themr decorator function', () => {
@@ -408,4 +411,33 @@ describe('Themr decorator function', () => {
       ...bar
     })
   })
+
+  it('should not update theme prop on rerender if nothing changed', () => {
+    const spy = sinon.stub().returns(<div />)
+    const div = document.createElement('div')
+
+    @themr('Container')
+    class Container extends Component {
+      shouldComponentUpdate(nextProps) {
+        return !shallowEqual(nextProps, this.props)
+      }
+
+      render() {
+        return spy()
+      }
+    }
+
+    render(
+      <Container />,
+      div
+    )
+
+    render(
+      <Container />,
+      div
+    )
+
+    expect(spy.calledOnce).toBe(true)
+
+  })
 })