Style improvements (#2475)

* HooksRouter is enabled by default

* Adds middleswares on PromiseRouter, fixes #2410

* Move testing line to helper

* Modernize middlewares.js

* Moves DB uniqueness initialization to DBController, modernize

* Moves testing related code to spec folder

* remove unused _removeHook function

* Adds tests, docs for Analytics and improvements

* nit

* moves back TestUtils

spec/Analytics.spec.js

@@ -0,0 +1,61 @@
+const analyticsAdapter = {
+  appOpened: function(parameters, req) {}, 
+  trackEvent: function(eventName, parameters, req) {}
+}
+
+describe('AnalyticsController', () => {
+  it('should track a simple event', (done) => {
+    
+    spyOn(analyticsAdapter, 'trackEvent').and.callThrough();
+    reconfigureServer({
+      analyticsAdapter
+    }).then(() => {
+      return Parse.Analytics.track('MyEvent', {
+        key: 'value',
+        count: '0'
+      })
+    }).then(() => {
+      expect(analyticsAdapter.trackEvent).toHaveBeenCalled();
+      var lastCall = analyticsAdapter.trackEvent.calls.first();
+      let args = lastCall.args;
+      expect(args[0]).toEqual('MyEvent');
+      expect(args[1]).toEqual({
+        dimensions: {
+          key: 'value',
+          count: '0'
+        }
+      });
+      done();
+    }, (err) => {
+      fail(JSON.stringify(err));
+      done();
+    })
+  });
+  
+  it('should track a app opened event', (done) => {
+    
+    spyOn(analyticsAdapter, 'appOpened').and.callThrough();
+    reconfigureServer({
+      analyticsAdapter
+    }).then(() => {
+      return Parse.Analytics.track('AppOpened', {
+        key: 'value',
+        count: '0'
+      })
+    }).then(() => {
+      expect(analyticsAdapter.appOpened).toHaveBeenCalled();
+      var lastCall = analyticsAdapter.appOpened.calls.first();
+      let args = lastCall.args;
+      expect(args[0]).toEqual({
+        dimensions: {
+          key: 'value',
+          count: '0'
+        }
+      });
+      done();
+    }, (err) => {
+      fail(JSON.stringify(err));
+      done();
+    })
+  })
+})