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diff --git a/test/unit/keyrings/simple-test.js b/test/unit/keyrings/simple-test.js
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+++ b/test/unit/keyrings/simple-test.js
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+const assert = require('assert')
+const extend = require('xtend')
+const Web3 = require('web3')
+const web3 = new Web3()
+const ethUtil = require('ethereumjs-util')
+const SimpleKeyring = require('../../../app/scripts/keyrings/simple')
+const TYPE_STR = 'Simple Key Pair'
+
+// Sample account:
+const privKeyHex = 'b8a9c05beeedb25df85f8d641538cbffedf67216048de9c678ee26260eb91952'
+
+describe('simple-keyring', function() {
+
+  let keyring
+  beforeEach(function() {
+    keyring = new SimpleKeyring()
+  })
+
+  describe('Keyring.type', function() {
+    it('is a class property that returns the type string.', function() {
+      const type = SimpleKeyring.type
+      assert.equal(type, TYPE_STR)
+    })
+  })
+
+  describe('#type', function() {
+    it('returns the correct value', function() {
+      const type = keyring.type
+      assert.equal(type, TYPE_STR)
+    })
+  })
+
+  describe('#serialize empty wallets.', function() {
+    it('serializes an empty array', function(done) {
+      keyring.serialize()
+      .then((output) => {
+        assert.deepEqual(output, [])
+        done()
+      })
+    })
+  })
+
+  describe('#deserialize a private key', function() {
+    it('serializes what it deserializes', function() {
+      keyring.deserialize([privKeyHex])
+      .then(() => {
+        assert.equal(keyring.wallets.length, 1, 'has one wallet')
+        const serialized = keyring.serialize()
+        assert.equal(serialized[0], privKeyHex)
+      })
+    })
+  })
+
+  describe('#signMessage', function() {
+    const address = '0x9858e7d8b79fc3e6d989636721584498926da38a'
+    const message = '0x879a053d4800c6354e76c7985a865d2922c82fb5b3f4577b2fe08b998954f2e0'
+    const privateKey = '0x7dd98753d7b4394095de7d176c58128e2ed6ee600abe97c9f6d9fd65015d9b18'
+    const expectedResult = '0x28fcb6768e5110144a55b2e6ce9d1ea5a58103033632d272d2b5cf506906f7941a00b539383fd872109633d8c71c404e13dba87bc84166ee31b0e36061a69e161c'
+
+    it('passes the dennis test', function(done) {
+      keyring.deserialize([ privateKey ])
+      .then(() => {
+        return keyring.signMessage(address, message)
+      })
+      .then((result) => {
+        assert.equal(result, expectedResult)
+        done()
+      })
+    })
+
+    it('reliably can decode messages it signs', function (done) {
+
+      const message = 'hello there!'
+      const msgHashHex = web3.sha3(message)
+      let address
+      let addresses = []
+
+      keyring.deserialize([ privateKey ])
+      .then(() => {
+        keyring.addAccounts(9)
+      })
+      .then(() => {
+        return keyring.getAccounts()
+      })
+      .then((addrs) => {
+        addresses = addrs
+        return Promise.all(addresses.map((address) => {
+          return keyring.signMessage(address, msgHashHex)
+        }))
+      })
+      .then((signatures) => {
+
+        signatures.forEach((sgn, index) => {
+          const address = addresses[index]
+
+          var r = ethUtil.toBuffer(sgn.slice(0,66))
+          var s = ethUtil.toBuffer('0x' + sgn.slice(66,130))
+          var v = ethUtil.bufferToInt(ethUtil.toBuffer('0x' + sgn.slice(130,132)))
+          var m = ethUtil.toBuffer(msgHashHex)
+          var pub = ethUtil.ecrecover(m, v, r, s)
+          var adr = '0x' + ethUtil.pubToAddress(pub).toString('hex')
+
+          assert.equal(adr, address, 'recovers address from signature correctly')
+        })
+        done()
+      })
+    })
+  })
+
+  describe('#addAccounts', function() {
+    describe('with no arguments', function() {
+      it('creates a single wallet', function() {
+        keyring.addAccounts()
+        .then(() => {
+          assert.equal(keyring.wallets.length, 1)
+        })
+      })
+    })
+
+    describe('with a numeric argument', function() {
+      it('creates that number of wallets', function() {
+        keyring.addAccounts(3)
+        .then(() => {
+          assert.equal(keyring.wallets.length, 3)
+        })
+      })
+    })
+  })
+
+  describe('#getAccounts', function() {
+    it('calls getAddress on each wallet', function(done) {
+
+      // Push a mock wallet
+      const desiredOutput = '0x18a3462427bcc9133bb46e88bcbe39cd7ef0e761'
+      keyring.wallets.push({
+        getAddress() {
+          return ethUtil.toBuffer(desiredOutput)
+        }
+      })
+
+      keyring.getAccounts()
+      .then((output) => {
+        assert.equal(output[0], desiredOutput)
+        assert.equal(output.length, 1)
+        done()
+      })
+    })
+  })
+})