diff --git a/test/unit/app/controllers/metamask-controller-test.js b/test/unit/app/controllers/metamask-controller-test.js
index a798d41e2..85c78fe1e 100644
--- a/test/unit/app/controllers/metamask-controller-test.js
+++ b/test/unit/app/controllers/metamask-controller-test.js
@@ -814,6 +814,77 @@ describe('MetaMaskController', function () {
     })
   })
 
+  describe('#_onKeyringControllerUpdate', function () {
+    it('should do nothing if there are no keyrings in state', async function () {
+      const addAddresses = sinon.fake()
+      const syncWithAddresses = sinon.fake()
+      sandbox.replace(metamaskController, 'preferencesController', {
+        addAddresses,
+      })
+      sandbox.replace(metamaskController, 'accountTracker', {
+        syncWithAddresses,
+      })
+
+      const oldState = metamaskController.getState()
+      await metamaskController._onKeyringControllerUpdate({keyrings: []})
+
+      assert.ok(addAddresses.notCalled)
+      assert.ok(syncWithAddresses.notCalled)
+      assert.deepEqual(metamaskController.getState(), oldState)
+    })
+
+    it('should update selected address if keyrings was locked', async function () {
+      const addAddresses = sinon.fake()
+      const getSelectedAddress = sinon.fake.returns('0x42')
+      const setSelectedAddress = sinon.fake()
+      const syncWithAddresses = sinon.fake()
+      sandbox.replace(metamaskController, 'preferencesController', {
+        addAddresses,
+        getSelectedAddress,
+        setSelectedAddress,
+      })
+      sandbox.replace(metamaskController, 'accountTracker', {
+        syncWithAddresses,
+      })
+
+      const oldState = metamaskController.getState()
+      await metamaskController._onKeyringControllerUpdate({
+        isUnlocked: false,
+        keyrings: [{
+          accounts: ['0x1', '0x2'],
+        }],
+      })
+
+      assert.deepEqual(addAddresses.args, [[['0x1', '0x2']]])
+      assert.deepEqual(syncWithAddresses.args, [[['0x1', '0x2']]])
+      assert.deepEqual(setSelectedAddress.args, [['0x1']])
+      assert.deepEqual(metamaskController.getState(), oldState)
+    })
+
+    it('should NOT update selected address if already unlocked', async function () {
+      const addAddresses = sinon.fake()
+      const syncWithAddresses = sinon.fake()
+      sandbox.replace(metamaskController, 'preferencesController', {
+        addAddresses,
+      })
+      sandbox.replace(metamaskController, 'accountTracker', {
+        syncWithAddresses,
+      })
+
+      const oldState = metamaskController.getState()
+      await metamaskController._onKeyringControllerUpdate({
+        isUnlocked: true,
+        keyrings: [{
+          accounts: ['0x1', '0x2'],
+        }],
+      })
+
+      assert.deepEqual(addAddresses.args, [[['0x1', '0x2']]])
+      assert.deepEqual(syncWithAddresses.args, [[['0x1', '0x2']]])
+      assert.deepEqual(metamaskController.getState(), oldState)
+    })
+  })
+
 })
 
 function deferredPromise () {