Added tests for jeromegn#177

I'm not able to test the reaction to the storage event as it only fires on the window that's _not_ doing the `setItem` call.

test/localstorage.test.js

@@ -170,6 +170,30 @@ describe('LocalStorage Model', function() {
     });
   });
 
+  describe('with storage updated from elsewhere', function() {
+    let newModel;
+    beforeEach(function() {
+      newModel = new SavedModel({
+        id: 10
+      });
+      newModel.fetch();
+      mySavedModel.save({
+        string: 'Brand new string'
+      });
+    });
+
+    afterEach(function() {
+      root.localStorage.clear();
+      newModel = null;
+    });
+
+    it('will re-fetch new data', function() {
+      newModel.fetch();
+
+      expect(newModel.get('string')).to.eql('Brand new string');
+    });
+  });
+
   describe('using ajaxSync: true', function() {
     beforeEach(function() {
       stub(Bb, 'ajax');
@@ -399,4 +423,30 @@ describe('LocalStorage Collection', function() {
       expect(mySavedCollection.length).to.be(0);
     });
   });
+
+  describe('will fetch from localStorage if updated separately', function() {
+    let newCollection = null;
+
+    beforeEach(function() {
+      mySavedCollection.create(attributes);
+      newCollection = new SavedCollection();
+      newCollection.fetch();
+    });
+
+    afterEach(function() {
+      newCollection = null;
+    });
+
+    it('fetches the items from the original collection', function() {
+      expect(newCollection.length).to.equal(1);
+    });
+
+    it('will update future changes', function() {
+      const newAttributes = clone(attributes);
+      newAttributes.number = 1338;
+      mySavedCollection.create(newAttributes);
+      newCollection.fetch();
+      expect(newCollection.length).to.equal(2);
+    });
+  });
 });