diff --git a/app/views/layouts/_head.html.haml b/app/views/layouts/_head.html.haml
index f6d8bb08a64..00de3b506b4 100644
--- a/app/views/layouts/_head.html.haml
+++ b/app/views/layouts/_head.html.haml
@@ -28,9 +28,12 @@
   = stylesheet_link_tag "application", media: "all"
   = stylesheet_link_tag "print",       media: "print"
 
+  = Gon::Base.render_data
+
   = javascript_include_tag(*webpack_asset_paths("runtime"))
   = javascript_include_tag(*webpack_asset_paths("common"))
   = javascript_include_tag(*webpack_asset_paths("main"))
+  = javascript_include_tag(*webpack_asset_paths("raven")) if sentry_enabled?
 
   - if content_for?(:page_specific_javascripts)
     = yield :page_specific_javascripts
diff --git a/app/views/layouts/application.html.haml b/app/views/layouts/application.html.haml
index cfd9481e4b2..4c7f0b57d16 100644
--- a/app/views/layouts/application.html.haml
+++ b/app/views/layouts/application.html.haml
@@ -2,12 +2,8 @@
 %html{ lang: "en", class: "#{page_class}" }
   = render "layouts/head"
   %body{ class: @body_class, data: { page: body_data_page, project: "#{@project.path if @project}", group: "#{@group.path if @group}" } }
-    = Gon::Base.render_data
-
     = render "layouts/header/default", title: header_title
     = render 'layouts/page', sidebar: sidebar, nav: nav
 
     = yield :scripts_body
     = render "layouts/init_auto_complete" if @gfm_form
-
-    = javascript_include_tag(*webpack_asset_paths("raven")) if sentry_enabled?
diff --git a/app/views/layouts/devise.html.haml b/app/views/layouts/devise.html.haml
index 6274f6340ab..52fb46eb8c9 100644
--- a/app/views/layouts/devise.html.haml
+++ b/app/views/layouts/devise.html.haml
@@ -3,7 +3,6 @@
   = render "layouts/head"
   %body.ui_charcoal.login-page.application.navless{ data: { page: body_data_page } }
     .page-wrap
-      = Gon::Base.render_data
       = render "layouts/header/empty"
       = render "layouts/broadcast"
       .container.navless-container
@@ -35,5 +34,3 @@
           = link_to "Explore", explore_root_path
           = link_to "Help", help_path
           = link_to "About GitLab", "https://about.gitlab.com/"
-
-      = javascript_include_tag(*webpack_asset_paths("raven")) if sentry_enabled?
diff --git a/app/views/layouts/devise_empty.html.haml b/app/views/layouts/devise_empty.html.haml
index 120f7299fc9..ed6731bde95 100644
--- a/app/views/layouts/devise_empty.html.haml
+++ b/app/views/layouts/devise_empty.html.haml
@@ -2,7 +2,6 @@
 %html{ lang: "en" }
   = render "layouts/head"
   %body.ui_charcoal.login-page.application.navless
-    = Gon::Base.render_data
     = render "layouts/header/empty"
     = render "layouts/broadcast"
     .container.navless-container
@@ -16,5 +15,3 @@
         = link_to "Explore", explore_root_path
         = link_to "Help", help_path
         = link_to "About GitLab", "https://about.gitlab.com/"
-
-    = javascript_include_tag(*webpack_asset_paths("raven")) if sentry_enabled?
diff --git a/config/webpack.config.js b/config/webpack.config.js
index 62118522606..77d703e008a 100644
--- a/config/webpack.config.js
+++ b/config/webpack.config.js
@@ -61,7 +61,7 @@ var config = {
       {
         test: /\.js$/,
         exclude: /(node_modules|vendor\/assets)/,
-        loader: 'babel-loader'
+        loader: 'babel-loader?plugins=rewire'
       },
       {
         test: /\.svg$/,
diff --git a/package.json b/package.json
index 0b24c5b8b04..d05ae8f7658 100644
--- a/package.json
+++ b/package.json
@@ -44,6 +44,7 @@
   },
   "devDependencies": {
     "babel-plugin-istanbul": "^4.0.0",
+    "babel-plugin-rewire": "^1.1.0",
     "eslint": "^3.10.1",
     "eslint-config-airbnb-base": "^10.0.1",
     "eslint-import-resolver-webpack": "^0.8.1",
diff --git a/spec/javascripts/.eslintrc b/spec/javascripts/.eslintrc
index 3d922021978..a3a8bb050c9 100644
--- a/spec/javascripts/.eslintrc
+++ b/spec/javascripts/.eslintrc
@@ -27,6 +27,19 @@
     "jasmine/no-suite-dupes": [1, "branch"],
     "jasmine/no-spec-dupes": [1, "branch"],
     "no-console": 0,
-    "prefer-arrow-callback": 0
+    "prefer-arrow-callback": 0,
+    "no-underscore-dangle": [
+      2,
+      {
+        "allow": [
+          "__GetDependency__",
+          "__Rewire__",
+          "__ResetDependency__",
+          "__get__",
+          "__set__",
+          "__RewireAPI__"
+        ]
+      }
+    ]
   }
 }
diff --git a/spec/javascripts/raven/raven_config_spec.js b/spec/javascripts/raven/raven_config_spec.js
index 3885cfde6bf..b8bb558d22e 100644
--- a/spec/javascripts/raven/raven_config_spec.js
+++ b/spec/javascripts/raven/raven_config_spec.js
@@ -1,8 +1,7 @@
-import $ from 'jquery';
 import Raven from 'raven-js';
-import RavenConfig from '~/raven/raven_config';
+import RavenConfig, { __RewireAPI__ as RavenConfigRewire } from '~/raven/raven_config';
 
-fdescribe('RavenConfig', () => {
+describe('RavenConfig', () => {
   describe('init', () => {
     let options;
 
@@ -116,21 +115,78 @@ fdescribe('RavenConfig', () => {
   });
 
   describe('bindRavenErrors', () => {
+    let $document;
+    let $;
+
     beforeEach(() => {
+      $document = jasmine.createSpyObj('$document', ['on']);
+      $ = jasmine.createSpy('$').and.returnValue($document);
+
+      RavenConfigRewire.__set__('$', $);
+
       RavenConfig.bindRavenErrors();
     });
 
     it('should query for document using jquery', () => {
-      console.log($, 'or', $.fn);
-      // expect($).toHaveBeenCalledWith()
+      expect($).toHaveBeenCalledWith(document);
     });
 
     it('should call .on', function () {
-      // expect($document.on).toHaveBeenCalledWith('ajaxError.raven', RavenConfig.handleRavenErrors);
+      expect($document.on).toHaveBeenCalledWith('ajaxError.raven', RavenConfig.handleRavenErrors);
     });
   });
 
   describe('handleRavenErrors', () => {
-    beforeEach(() => {});
+    let event;
+    let req;
+    let config;
+    let err;
+
+    beforeEach(() => {
+      event = {};
+      req = { status: 'status', responseText: 'responseText', statusText: 'statusText' };
+      config = { type: 'type', url: 'url', data: 'data' };
+      err = {};
+
+      spyOn(Raven, 'captureMessage');
+
+      RavenConfig.handleRavenErrors(event, req, config, err);
+    });
+
+    it('should call Raven.captureMessage', () => {
+      expect(Raven.captureMessage).toHaveBeenCalledWith(err, {
+        extra: {
+          type: config.type,
+          url: config.url,
+          data: config.data,
+          status: req.status,
+          response: req.responseText.substring(0, 100),
+          error: err,
+          event,
+        },
+      });
+    });
+
+    describe('if no err is provided', () => {
+      beforeEach(() => {
+        Raven.captureMessage.calls.reset();
+
+        RavenConfig.handleRavenErrors(event, req, config);
+      });
+
+      it('should use req.statusText as the error value', () => {
+        expect(Raven.captureMessage).toHaveBeenCalledWith(req.statusText, {
+          extra: {
+            type: config.type,
+            url: config.url,
+            data: config.data,
+            status: req.status,
+            response: req.responseText.substring(0, 100),
+            error: req.statusText,
+            event,
+          },
+        });
+      });
+    });
   });
 });
diff --git a/yarn.lock b/yarn.lock
index 46f528f0bec..6e9b9bd9cec 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -406,6 +406,10 @@ babel-plugin-istanbul@^4.0.0:
     istanbul-lib-instrument "^1.4.2"
     test-exclude "^4.0.0"
 
+babel-plugin-rewire@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-rewire/-/babel-plugin-rewire-1.1.0.tgz#a6b966d9d8c06c03d95dcda2eec4e2521519549b"
+
 babel-plugin-syntax-async-functions@^6.8.0:
   version "6.13.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-syntax-async-functions/-/babel-plugin-syntax-async-functions-6.13.0.tgz#cad9cad1191b5ad634bf30ae0872391e0647be95"