Add migration tests to ensure that bodies are erased properly in notices.

test/lib/migrations/004.json

@@ -48,6 +48,13 @@
             "title":"Ending Morden Support",
             "body":"Due to [recent events](https://blog.ethereum.org/2016/11/20/from-morden-to-ropsten/), MetaMask is now deprecating support for the Morden Test Network.\n\nUsers will still be able to access Morden through a locally hosted node, but we will no longer be providing hosted access to this network through [Infura](http://infura.io/).\n\nPlease use the new Ropsten Network as your new default test network.\n\nYou can fund your Ropsten account using the buy button on your account page.\n\nBest wishes!\nThe MetaMask Team\n\n",
             "id":0
+         },
+         {
+           "read":false,
+           "date":"Sat Dec 17 2016",
+           "title":"Keeping It Real",
+           "body":"nonempty",
+           "id":1
          }
       ],
       "conversionRate":12.66441492,

test/unit/migrations-test.js

@@ -15,6 +15,8 @@ const migration8 = require(path.join('..', '..', 'app', 'scripts', 'migrations',
 const migration9 = require(path.join('..', '..', 'app', 'scripts', 'migrations', '009'))
 const migration10 = require(path.join('..', '..', 'app', 'scripts', 'migrations', '010'))
 const migration11 = require(path.join('..', '..', 'app', 'scripts', 'migrations', '011'))
+const migration12 = require(path.join('..', '..', 'app', 'scripts', 'migrations', '012'))
+
 
 const oldTestRpc = 'https://rawtestrpc.metamask.io/'
 const newTestRpc = 'https://testrpc.metamask.io/'
@@ -91,6 +93,11 @@ describe('wallet1 is migrated successfully', () => {
     }).then((eleventhResult) => {
       assert.equal(eleventhResult.data.isDisclaimerConfirmed, null, 'isDisclaimerConfirmed should not exist')
       assert.equal(eleventhResult.data.TOSHash, null, 'TOSHash should not exist')
+
+      return migration12.migrate(eleventhResult)
+    }).then((twelfthResult) => {
+      assert.equal(twelfthResult.data.NoticeController.noticesList[0].body, '', 'notices that have been read should have an empty body.')
+      assert.equal(twelfthResult.data.NoticeController.noticesList[1].body, 'nonempty', 'notices that have not been read should not have an empty body.')
     })
 
   })