Merge branch 'add-sentry-js-again-with-vue' into 'master'

Add sentry JS

See merge request !6764

19 files changed, 535 insertions, 9 deletions

diff --git a/app/assets/javascripts/raven/index.js b/app/assets/javascripts/raven/index.js
new file mode 100644
index 00000000000..5325e495815
--- /dev/null
+++ b/app/assets/javascripts/raven/index.js
@@ -0,0 +1,16 @@
+import RavenConfig from './raven_config';
+
+const index = function index() {
+  RavenConfig.init({
+    sentryDsn: gon.sentry_dsn,
+    currentUserId: gon.current_user_id,
+    whitelistUrls: [gon.gitlab_url],
+    isProduction: process.env.NODE_ENV,
+  });
+
+  return RavenConfig;
+};
+
+index();
+
+export default index;
diff --git a/app/assets/javascripts/raven/raven_config.js b/app/assets/javascripts/raven/raven_config.js
new file mode 100644
index 00000000000..c7fe1cacf49
--- /dev/null
+++ b/app/assets/javascripts/raven/raven_config.js
@@ -0,0 +1,100 @@
+import Raven from 'raven-js';
+
+const IGNORE_ERRORS = [
+  // Random plugins/extensions
+  'top.GLOBALS',
+  // See: http://blog.errorception.com/2012/03/tale-of-unfindable-js-error. html
+  'originalCreateNotification',
+  'canvas.contentDocument',
+  'MyApp_RemoveAllHighlights',
+  'http://tt.epicplay.com',
+  'Can\'t find variable: ZiteReader',
+  'jigsaw is not defined',
+  'ComboSearch is not defined',
+  'http://loading.retry.widdit.com/',
+  'atomicFindClose',
+  // Facebook borked
+  'fb_xd_fragment',
+  // ISP "optimizing" proxy - `Cache-Control: no-transform` seems to
+  // reduce this. (thanks @acdha)
+  // See http://stackoverflow.com/questions/4113268
+  'bmi_SafeAddOnload',
+  'EBCallBackMessageReceived',
+  // See http://toolbar.conduit.com/Developer/HtmlAndGadget/Methods/JSInjection.aspx
+  'conduitPage',
+];
+
+const IGNORE_URLS = [
+  // Facebook flakiness
+  /graph\.facebook\.com/i,
+  // Facebook blocked
+  /connect\.facebook\.net\/en_US\/all\.js/i,
+  // Woopra flakiness
+  /eatdifferent\.com\.woopra-ns\.com/i,
+  /static\.woopra\.com\/js\/woopra\.js/i,
+  // Chrome extensions
+  /extensions\//i,
+  /^chrome:\/\//i,
+  // Other plugins
+  /127\.0\.0\.1:4001\/isrunning/i,  // Cacaoweb
+  /webappstoolbarba\.texthelp\.com\//i,
+  /metrics\.itunes\.apple\.com\.edgesuite\.net\//i,
+];
+
+const SAMPLE_RATE = 95;
+
+const RavenConfig = {
+  IGNORE_ERRORS,
+  IGNORE_URLS,
+  SAMPLE_RATE,
+  init(options = {}) {
+    this.options = options;
+
+    this.configure();
+    this.bindRavenErrors();
+    if (this.options.currentUserId) this.setUser();
+  },
+
+  configure() {
+    Raven.config(this.options.sentryDsn, {
+      whitelistUrls: this.options.whitelistUrls,
+      environment: this.options.isProduction ? 'production' : 'development',
+      ignoreErrors: this.IGNORE_ERRORS,
+      ignoreUrls: this.IGNORE_URLS,
+      shouldSendCallback: this.shouldSendSample.bind(this),
+    }).install();
+  },
+
+  setUser() {
+    Raven.setUserContext({
+      id: this.options.currentUserId,
+    });
+  },
+
+  bindRavenErrors() {
+    window.$(document).on('ajaxError.raven', this.handleRavenErrors);
+  },
+
+  handleRavenErrors(event, req, config, err) {
+    const error = err || req.statusText;
+    const responseText = req.responseText || 'Unknown response text';
+
+    Raven.captureMessage(error, {
+      extra: {
+        type: config.type,
+        url: config.url,
+        data: config.data,
+        status: req.status,
+        response: responseText,
+        error,
+        event,
+      },
+    });
+  },
+
+  shouldSendSample() {
+    return Math.random() * 100 <= this.SAMPLE_RATE;
+  },
+};
+
+export default RavenConfig;
diff --git a/app/controllers/admin/application_settings_controller.rb b/app/controllers/admin/application_settings_controller.rb
index 643993d035e..152d7baad49 100644
--- a/app/controllers/admin/application_settings_controller.rb
+++ b/app/controllers/admin/application_settings_controller.rb
@@ -133,6 +133,8 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
       :signup_enabled,
       :sentry_dsn,
       :sentry_enabled,
+      :clientside_sentry_dsn,
+      :clientside_sentry_enabled,
       :send_user_confirmation_email,
       :shared_runners_enabled,
       :shared_runners_text,
diff --git a/app/models/application_setting.rb b/app/models/application_setting.rb
index cf042717c95..54f01f8637e 100644
--- a/app/models/application_setting.rb
+++ b/app/models/application_setting.rb
@@ -62,6 +62,10 @@ class ApplicationSetting < ActiveRecord::Base
             presence: true,
             if: :sentry_enabled
 
+  validates :clientside_sentry_dsn,
+            presence: true,
+            if: :clientside_sentry_enabled
+
   validates :akismet_api_key,
             presence: true,
             if: :akismet_enabled
diff --git a/app/views/admin/application_settings/_form.html.haml b/app/views/admin/application_settings/_form.html.haml
index 0dc1103eece..4b6628169ef 100644
--- a/app/views/admin/application_settings/_form.html.haml
+++ b/app/views/admin/application_settings/_form.html.haml
@@ -394,8 +394,6 @@
 
   %fieldset
     %legend Error Reporting and Logging
-    %p
-      These settings require a restart to take effect.
     .form-group
       .col-sm-offset-2.col-sm-10
         .checkbox
@@ -403,6 +401,7 @@
             = f.check_box :sentry_enabled
             Enable Sentry
           .help-block
+            %p This setting requires a restart to take effect.
             Sentry is an error reporting and logging tool which is currently not shipped with GitLab, get it here:
             %a{ href: 'https://getsentry.com', target: '_blank', rel: 'noopener noreferrer' } https://getsentry.com
 
@@ -411,6 +410,21 @@
       .col-sm-10
         = f.text_field :sentry_dsn, class: 'form-control'
 
+    .form-group
+      .col-sm-offset-2.col-sm-10
+        .checkbox
+          = f.label :clientside_sentry_enabled do
+            = f.check_box :clientside_sentry_enabled
+            Enable Clientside Sentry
+          .help-block
+            Sentry can also be used for reporting and logging clientside exceptions.
+            %a{ href: 'https://sentry.io/for/javascript/', target: '_blank', rel: 'noopener noreferrer' } https://sentry.io/for/javascript/
+
+    .form-group
+      = f.label :clientside_sentry_dsn, 'Clientside Sentry DSN', class: 'control-label col-sm-2'
+      .col-sm-10
+        = f.text_field :clientside_sentry_dsn, class: 'form-control'
+
   %fieldset
     %legend Repository Storage
     .form-group
diff --git a/app/views/layouts/_head.html.haml b/app/views/layouts/_head.html.haml
index 19473b6ab27..afcc2b6e4f3 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
+
   = webpack_bundle_tag "runtime"
   = webpack_bundle_tag "common"
   = webpack_bundle_tag "main"
+  = webpack_bundle_tag "raven" if current_application_settings.clientside_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 dc926a615c7..7e011ac3e75 100644
--- a/app/views/layouts/application.html.haml
+++ b/app/views/layouts/application.html.haml
@@ -2,8 +2,6 @@
 %html{ lang: I18n.locale, 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
 
diff --git a/app/views/layouts/devise.html.haml b/app/views/layouts/devise.html.haml
index 3368a9beb29..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
diff --git a/app/views/layouts/devise_empty.html.haml b/app/views/layouts/devise_empty.html.haml
index 7466423a934..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
diff --git a/config/webpack.config.js b/config/webpack.config.js
index 3abdb6c2d76..a8ea57896c2 100644
--- a/config/webpack.config.js
+++ b/config/webpack.config.js
@@ -55,6 +55,7 @@ var config = {
     terminal:             './terminal/terminal_bundle.js',
     u2f:                  ['vendor/u2f'],
     users:                './users/users_bundle.js',
+    raven:                './raven/index.js',
   },
 
   output: {
diff --git a/db/migrate/20170504102911_add_clientside_sentry_to_application_settings.rb b/db/migrate/20170504102911_add_clientside_sentry_to_application_settings.rb
new file mode 100644
index 00000000000..141112f8b50
--- /dev/null
+++ b/db/migrate/20170504102911_add_clientside_sentry_to_application_settings.rb
@@ -0,0 +1,33 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddClientsideSentryToApplicationSettings < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  # When a migration requires downtime you **must** uncomment the following
+  # constant and define a short and easy to understand explanation as to why the
+  # migration requires downtime.
+  # DOWNTIME_REASON = ''
+
+  # When using "add_concurrent_index" or "remove_concurrent_index" methods make sure
+  # that either of them is the _only_ method called in the migration,
+  # any other changes should go in a separate migration.
+  # This ensures that upon failure _only_ the index creation or removing fails
+  # and can be retried or reverted easily.
+  #
+  # To disable transactions uncomment the following line and remove these
+  # comments:
+  disable_ddl_transaction!
+
+  def up
+    add_column_with_default :application_settings, :clientside_sentry_enabled, :boolean, default: false
+    add_column :application_settings, :clientside_sentry_dsn, :string
+  end
+
+  def down
+    remove_columns :application_settings, :clientside_sentry_enabled, :clientside_sentry_dsn
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 132549ab34c..588e2082ae0 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170503004425) do
+ActiveRecord::Schema.define(version: 20170504102911) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -121,6 +121,8 @@ ActiveRecord::Schema.define(version: 20170503004425) do
     t.integer "cached_markdown_version"
     t.boolean "usage_ping_enabled", default: true, null: false
     t.string "uuid"
+    t.boolean "clientside_sentry_enabled", default: false, null: false
+    t.string "clientside_sentry_dsn"
   end
 
   create_table "audit_events", force: :cascade do |t|
@@ -1413,4 +1415,4 @@ ActiveRecord::Schema.define(version: 20170503004425) do
   add_foreign_key "timelogs", "merge_requests", name: "fk_timelogs_merge_requests_merge_request_id", on_delete: :cascade
   add_foreign_key "trending_projects", "projects", on_delete: :cascade
   add_foreign_key "u2f_registrations", "users"
-end
+end
\ No newline at end of file
diff --git a/lib/api/settings.rb b/lib/api/settings.rb
index d01c7f2703b..82f513c984e 100644
--- a/lib/api/settings.rb
+++ b/lib/api/settings.rb
@@ -58,6 +58,7 @@ module API
         :restricted_visibility_levels,
         :send_user_confirmation_email,
         :sentry_enabled,
+        :clientside_sentry_enabled,
         :session_expire_delay,
         :shared_runners_enabled,
         :sidekiq_throttling_enabled,
@@ -138,6 +139,10 @@ module API
       given sentry_enabled: ->(val) { val } do
         requires :sentry_dsn, type: String, desc: 'Sentry Data Source Name'
       end
+      optional :clientside_sentry_enabled, type: Boolean, desc: 'Sentry can also be used for reporting and logging clientside exceptions. https://sentry.io/for/javascript/'
+      given clientside_sentry_enabled: ->(val) { val } do
+        requires :clientside_sentry_dsn, type: String, desc: 'Clientside Sentry Data Source Name'
+      end
       optional :repository_storage, type: String, desc: 'Storage paths for new projects'
       optional :repository_checks_enabled, type: Boolean, desc: "GitLab will periodically run 'git fsck' in all project and wiki repositories to look for silent disk corruption issues."
       optional :koding_enabled, type: Boolean, desc: 'Enable Koding'
diff --git a/lib/gitlab/gon_helper.rb b/lib/gitlab/gon_helper.rb
index 5ab84266b7d..26473f99bc3 100644
--- a/lib/gitlab/gon_helper.rb
+++ b/lib/gitlab/gon_helper.rb
@@ -10,6 +10,8 @@ module Gitlab
       gon.user_color_scheme      = Gitlab::ColorSchemes.for_user(current_user).css_class
       gon.katex_css_url          = ActionController::Base.helpers.asset_path('katex.css')
       gon.katex_js_url           = ActionController::Base.helpers.asset_path('katex.js')
+      gon.sentry_dsn             = current_application_settings.clientside_sentry_dsn if current_application_settings.clientside_sentry_enabled
+      gon.gitlab_url             = Gitlab.config.gitlab.url
 
       if current_user
         gon.current_user_id = current_user.id
diff --git a/package.json b/package.json
index 63b2c190269..dd73636121a 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
     "pikaday": "^1.5.1",
     "prismjs": "^1.6.0",
     "raphael": "^2.2.7",
+    "raven-js": "^3.14.0",
     "raw-loader": "^0.5.1",
     "react-dev-utils": "^0.5.2",
     "select2": "3.5.2-browserify",
diff --git a/spec/features/raven_js_spec.rb b/spec/features/raven_js_spec.rb
new file mode 100644
index 00000000000..e8fa49c18cb
--- /dev/null
+++ b/spec/features/raven_js_spec.rb
@@ -0,0 +1,23 @@
+require 'spec_helper'
+
+feature 'RavenJS', :feature, :js do
+  let(:raven_path) { '/raven.bundle.js' }
+
+  it 'should not load raven if sentry is disabled' do
+    visit new_user_session_path
+
+    expect(has_requested_raven).to eq(false)
+  end
+
+  it 'should load raven if sentry is enabled' do
+    stub_application_setting(clientside_sentry_dsn: 'https://key@domain.com/id', clientside_sentry_enabled: true)
+
+    visit new_user_session_path
+
+    expect(has_requested_raven).to eq(true)
+  end
+
+  def has_requested_raven
+    page.driver.network_traffic.one? {|request| request.url.end_with?(raven_path)}
+  end
+end
diff --git a/spec/javascripts/raven/index_spec.js b/spec/javascripts/raven/index_spec.js
new file mode 100644
index 00000000000..b5662cd0331
--- /dev/null
+++ b/spec/javascripts/raven/index_spec.js
@@ -0,0 +1,42 @@
+import RavenConfig from '~/raven/raven_config';
+import index from '~/raven/index';
+
+describe('RavenConfig options', () => {
+  let sentryDsn;
+  let currentUserId;
+  let gitlabUrl;
+  let isProduction;
+  let indexReturnValue;
+
+  beforeEach(() => {
+    sentryDsn = 'sentryDsn';
+    currentUserId = 'currentUserId';
+    gitlabUrl = 'gitlabUrl';
+    isProduction = 'isProduction';
+
+    window.gon = {
+      sentry_dsn: sentryDsn,
+      current_user_id: currentUserId,
+      gitlab_url: gitlabUrl,
+    };
+
+    process.env.NODE_ENV = isProduction;
+
+    spyOn(RavenConfig, 'init');
+
+    indexReturnValue = index();
+  });
+
+  it('should init with .sentryDsn, .currentUserId, .whitelistUrls and .isProduction', () => {
+    expect(RavenConfig.init).toHaveBeenCalledWith({
+      sentryDsn,
+      currentUserId,
+      whitelistUrls: [gitlabUrl],
+      isProduction,
+    });
+  });
+
+  it('should return RavenConfig', () => {
+    expect(indexReturnValue).toBe(RavenConfig);
+  });
+});
diff --git a/spec/javascripts/raven/raven_config_spec.js b/spec/javascripts/raven/raven_config_spec.js
new file mode 100644
index 00000000000..a2d720760fc
--- /dev/null
+++ b/spec/javascripts/raven/raven_config_spec.js
@@ -0,0 +1,276 @@
+import Raven from 'raven-js';
+import RavenConfig from '~/raven/raven_config';
+
+describe('RavenConfig', () => {
+  describe('IGNORE_ERRORS', () => {
+    it('should be an array of strings', () => {
+      const areStrings = RavenConfig.IGNORE_ERRORS.every(error => typeof error === 'string');
+
+      expect(areStrings).toBe(true);
+    });
+  });
+
+  describe('IGNORE_URLS', () => {
+    it('should be an array of regexps', () => {
+      const areRegExps = RavenConfig.IGNORE_URLS.every(url => url instanceof RegExp);
+
+      expect(areRegExps).toBe(true);
+    });
+  });
+
+  describe('SAMPLE_RATE', () => {
+    it('should be a finite number', () => {
+      expect(typeof RavenConfig.SAMPLE_RATE).toEqual('number');
+    });
+  });
+
+  describe('init', () => {
+    let options;
+
+    beforeEach(() => {
+      options = {
+        sentryDsn: '//sentryDsn',
+        ravenAssetUrl: '//ravenAssetUrl',
+        currentUserId: 1,
+        whitelistUrls: ['//gitlabUrl'],
+        isProduction: true,
+      };
+
+      spyOn(RavenConfig, 'configure');
+      spyOn(RavenConfig, 'bindRavenErrors');
+      spyOn(RavenConfig, 'setUser');
+
+      RavenConfig.init(options);
+    });
+
+    it('should set the options property', () => {
+      expect(RavenConfig.options).toEqual(options);
+    });
+
+    it('should call the configure method', () => {
+      expect(RavenConfig.configure).toHaveBeenCalled();
+    });
+
+    it('should call the error bindings method', () => {
+      expect(RavenConfig.bindRavenErrors).toHaveBeenCalled();
+    });
+
+    it('should call setUser', () => {
+      expect(RavenConfig.setUser).toHaveBeenCalled();
+    });
+
+    it('should not call setUser if there is no current user ID', () => {
+      RavenConfig.setUser.calls.reset();
+
+      RavenConfig.init({
+        sentryDsn: '//sentryDsn',
+        ravenAssetUrl: '//ravenAssetUrl',
+        currentUserId: undefined,
+        whitelistUrls: ['//gitlabUrl'],
+        isProduction: true,
+      });
+
+      expect(RavenConfig.setUser).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('configure', () => {
+    let options;
+    let raven;
+    let ravenConfig;
+
+    beforeEach(() => {
+      options = {
+        sentryDsn: '//sentryDsn',
+        whitelistUrls: ['//gitlabUrl'],
+        isProduction: true,
+      };
+
+      ravenConfig = jasmine.createSpyObj('ravenConfig', ['shouldSendSample']);
+      raven = jasmine.createSpyObj('raven', ['install']);
+
+      spyOn(Raven, 'config').and.returnValue(raven);
+
+      ravenConfig.options = options;
+      ravenConfig.IGNORE_ERRORS = 'ignore_errors';
+      ravenConfig.IGNORE_URLS = 'ignore_urls';
+
+      RavenConfig.configure.call(ravenConfig);
+    });
+
+    it('should call Raven.config', () => {
+      expect(Raven.config).toHaveBeenCalledWith(options.sentryDsn, {
+        whitelistUrls: options.whitelistUrls,
+        environment: 'production',
+        ignoreErrors: ravenConfig.IGNORE_ERRORS,
+        ignoreUrls: ravenConfig.IGNORE_URLS,
+        shouldSendCallback: jasmine.any(Function),
+      });
+    });
+
+    it('should call Raven.install', () => {
+      expect(raven.install).toHaveBeenCalled();
+    });
+
+    it('should set .environment to development if isProduction is false', () => {
+      ravenConfig.options.isProduction = false;
+
+      RavenConfig.configure.call(ravenConfig);
+
+      expect(Raven.config).toHaveBeenCalledWith(options.sentryDsn, {
+        whitelistUrls: options.whitelistUrls,
+        environment: 'development',
+        ignoreErrors: ravenConfig.IGNORE_ERRORS,
+        ignoreUrls: ravenConfig.IGNORE_URLS,
+        shouldSendCallback: jasmine.any(Function),
+      });
+    });
+  });
+
+  describe('setUser', () => {
+    let ravenConfig;
+
+    beforeEach(() => {
+      ravenConfig = { options: { currentUserId: 1 } };
+      spyOn(Raven, 'setUserContext');
+
+      RavenConfig.setUser.call(ravenConfig);
+    });
+
+    it('should call .setUserContext', function () {
+      expect(Raven.setUserContext).toHaveBeenCalledWith({
+        id: ravenConfig.options.currentUserId,
+      });
+    });
+  });
+
+  describe('bindRavenErrors', () => {
+    let $document;
+    let $;
+
+    beforeEach(() => {
+      $document = jasmine.createSpyObj('$document', ['on']);
+      $ = jasmine.createSpy('$').and.returnValue($document);
+
+      window.$ = $;
+
+      RavenConfig.bindRavenErrors();
+    });
+
+    it('should call .on', function () {
+      expect($document.on).toHaveBeenCalledWith('ajaxError.raven', RavenConfig.handleRavenErrors);
+    });
+  });
+
+  describe('handleRavenErrors', () => {
+    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,
+          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,
+            error: req.statusText,
+            event,
+          },
+        });
+      });
+    });
+
+    describe('if no req.responseText is provided', () => {
+      beforeEach(() => {
+        req.responseText = undefined;
+
+        Raven.captureMessage.calls.reset();
+
+        RavenConfig.handleRavenErrors(event, req, config, err);
+      });
+
+      it('should use `Unknown response text` as the response', () => {
+        expect(Raven.captureMessage).toHaveBeenCalledWith(err, {
+          extra: {
+            type: config.type,
+            url: config.url,
+            data: config.data,
+            status: req.status,
+            response: 'Unknown response text',
+            error: err,
+            event,
+          },
+        });
+      });
+    });
+  });
+
+  describe('shouldSendSample', () => {
+    let randomNumber;
+
+    beforeEach(() => {
+      RavenConfig.SAMPLE_RATE = 50;
+
+      spyOn(Math, 'random').and.callFake(() => randomNumber);
+    });
+
+    it('should call Math.random', () => {
+      RavenConfig.shouldSendSample();
+
+      expect(Math.random).toHaveBeenCalled();
+    });
+
+    it('should return true if the sample rate is greater than the random number * 100', () => {
+      randomNumber = 0.1;
+
+      expect(RavenConfig.shouldSendSample()).toBe(true);
+    });
+
+    it('should return false if the sample rate is less than the random number * 100', () => {
+      randomNumber = 0.9;
+
+      expect(RavenConfig.shouldSendSample()).toBe(false);
+    });
+
+    it('should return true if the sample rate is equal to the random number * 100', () => {
+      randomNumber = 0.5;
+
+      expect(RavenConfig.shouldSendSample()).toBe(true);
+    });
+  });
+});
diff --git a/yarn.lock b/yarn.lock
index 8c72f36af3a..7bfa1426ce0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3190,7 +3190,7 @@ json-stable-stringify@^1.0.0, json-stable-stringify@^1.0.1:
   dependencies:
     jsonify "~0.0.0"
 
-json-stringify-safe@~5.0.1:
+json-stringify-safe@^5.0.1, json-stringify-safe@~5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz#1296a2d58fd45f19a0f6ce01d65701e2c735b6eb"
 
@@ -4584,6 +4584,12 @@ raphael@^2.2.7:
   dependencies:
     eve-raphael "0.5.0"
 
+raven-js@^3.14.0:
+  version "3.14.0"
+  resolved "https://registry.yarnpkg.com/raven-js/-/raven-js-3.14.0.tgz#94dda81d975fdc4a42f193db437cf70021d654e0"
+  dependencies:
+    json-stringify-safe "^5.0.1"
+
 raw-body@~2.2.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/raw-body/-/raw-body-2.2.0.tgz#994976cf6a5096a41162840492f0bdc5d6e7fb96"