Merge branch 'ph-axios-2' into 'master'

More conversions to axios

See merge request gitlab-org/gitlab-ce!16800

app/assets/javascripts/issue.js

 /* eslint-disable func-names, space-before-function-paren, no-var, prefer-rest-params, wrap-iife, one-var, no-underscore-dangle, one-var-declaration-per-line, object-shorthand, no-unused-vars, no-new, comma-dangle, consistent-return, quotes, dot-notation, quote-props, prefer-arrow-callback, max-len */
 import 'vendor/jquery.waitforimages';
+import axios from './lib/utils/axios_utils';
 import { addDelimiter } from './lib/utils/text_utility';
-import Flash from './flash';
+import flash from './flash';
 import TaskList from './task_list';
 import CreateMergeRequestDropdown from './create_merge_request_dropdown';
 import IssuablesHelper from './helpers/issuables_helper';
@@ -42,12 +43,8 @@ export default class Issue {
       this.disableCloseReopenButton($button);
 
       url = $button.attr('href');
-      return $.ajax({
-        type: 'PUT',
-        url: url
-      })
-      .fail(() => new Flash(issueFailMessage))
-      .done((data) => {
+      return axios.put(url)
+      .then(({ data }) => {
         const isClosedBadge = $('div.status-box-issue-closed');
         const isOpenBadge = $('div.status-box-open');
         const projectIssuesCounter = $('.issue_counter');
@@ -74,9 +71,10 @@ export default class Issue {
             }
           }
         } else {
-          new Flash(issueFailMessage);
+          flash(issueFailMessage);
         }
       })
+      .catch(() => flash(issueFailMessage))
       .then(() => {
         this.disableCloseReopenButton($button, false);
       });
@@ -115,24 +113,22 @@ export default class Issue {
   static initMergeRequests() {
     var $container;
     $container = $('#merge-requests');
-    return $.getJSON($container.data('url')).fail(function() {
-      return new Flash('Failed to load referenced merge requests');
-    }).done(function(data) {
-      if ('html' in data) {
-        return $container.html(data.html);
-      }
-    });
+    return axios.get($container.data('url'))
+      .then(({ data }) => {
+        if ('html' in data) {
+          $container.html(data.html);
+        }
+      }).catch(() => flash('Failed to load referenced merge requests'));
   }
 
   static initRelatedBranches() {
     var $container;
     $container = $('#related-branches');
-    return $.getJSON($container.data('url')).fail(function() {
-      return new Flash('Failed to load related branches');
-    }).done(function(data) {
-      if ('html' in data) {
-        return $container.html(data.html);
-      }
-    });
+    return axios.get($container.data('url'))
+      .then(({ data }) => {
+        if ('html' in data) {
+          $container.html(data.html);
+        }
+      }).catch(() => flash('Failed to load related branches'));
   }
 }

app/assets/javascripts/job.js

 import _ from 'underscore';
+import axios from './lib/utils/axios_utils';
 import { visitUrl } from './lib/utils/url_utility';
 import bp from './breakpoints';
 import { numberToHumanSize } from './lib/utils/number_utils';
@@ -8,6 +9,7 @@ export default class Job {
   constructor(options) {
     this.timeout = null;
     this.state = null;
+    this.fetchingStatusFavicon = false;
     this.options = options || $('.js-build-options').data();
 
     this.pagePath = this.options.pagePath;
@@ -171,12 +173,23 @@ export default class Job {
   }
 
   getBuildTrace() {
-    return $.ajax({
-      url: `${this.pagePath}/trace.json`,
-      data: { state: this.state },
+    return axios.get(`${this.pagePath}/trace.json`, {
+      params: { state: this.state },
     })
-      .done((log) => {
-        setCiStatusFavicon(`${this.pagePath}/status.json`);
+      .then((res) => {
+        const log = res.data;
+
+        if (!this.fetchingStatusFavicon) {
+          this.fetchingStatusFavicon = true;
+
+          setCiStatusFavicon(`${this.pagePath}/status.json`)
+            .then(() => {
+              this.fetchingStatusFavicon = false;
+            })
+            .catch(() => {
+              this.fetchingStatusFavicon = false;
+            });
+        }
 
         if (log.state) {
           this.state = log.state;
@@ -217,7 +230,7 @@ export default class Job {
           visitUrl(this.pagePath);
         }
       })
-      .fail(() => {
+      .catch(() => {
         this.$buildRefreshAnimation.remove();
       })
       .then(() => {

app/assets/javascripts/labels_select.js

@@ -2,9 +2,12 @@
 /* global Issuable */
 /* global ListLabel */
 import _ from 'underscore';
+import { __ } from './locale';
+import axios from './lib/utils/axios_utils';
 import IssuableBulkUpdateActions from './issuable_bulk_update_actions';
 import DropdownUtils from './filtered_search/dropdown_utils';
 import CreateLabelDropdown from './create_label';
+import flash from './flash';
 
 export default class LabelsSelect {
   constructor(els, options = {}) {
@@ -82,99 +85,96 @@ export default class LabelsSelect {
         }
         $loading.removeClass('hidden').fadeIn();
         $dropdown.trigger('loading.gl.dropdown');
-        return $.ajax({
-          type: 'PUT',
-          url: issueUpdateURL,
-          dataType: 'JSON',
-          data: data
-        }).done(function(data) {
-          var labelCount, template, labelTooltipTitle, labelTitles;
-          $loading.fadeOut();
-          $dropdown.trigger('loaded.gl.dropdown');
-          $selectbox.hide();
-          data.issueURLSplit = issueURLSplit;
-          labelCount = 0;
-          if (data.labels.length) {
-            template = labelHTMLTemplate(data);
-            labelCount = data.labels.length;
-          }
-          else {
-            template = labelNoneHTMLTemplate;
-          }
-          $value.removeAttr('style').html(template);
-          $sidebarCollapsedValue.text(labelCount);
+        axios.put(issueUpdateURL, data)
+          .then(({ data }) => {
+            var labelCount, template, labelTooltipTitle, labelTitles;
+            $loading.fadeOut();
+            $dropdown.trigger('loaded.gl.dropdown');
+            $selectbox.hide();
+            data.issueURLSplit = issueURLSplit;
+            labelCount = 0;
+            if (data.labels.length) {
+              template = labelHTMLTemplate(data);
+              labelCount = data.labels.length;
+            }
+            else {
+              template = labelNoneHTMLTemplate;
+            }
+            $value.removeAttr('style').html(template);
+            $sidebarCollapsedValue.text(labelCount);
 
-          if (data.labels.length) {
-            labelTitles = data.labels.map(function(label) {
-              return label.title;
-            });
+            if (data.labels.length) {
+              labelTitles = data.labels.map(function(label) {
+                return label.title;
+              });
 
-            if (labelTitles.length > 5) {
-              labelTitles = labelTitles.slice(0, 5);
-              labelTitles.push('and ' + (data.labels.length - 5) + ' more');
-            }
+              if (labelTitles.length > 5) {
+                labelTitles = labelTitles.slice(0, 5);
+                labelTitles.push('and ' + (data.labels.length - 5) + ' more');
+              }
 
-            labelTooltipTitle = labelTitles.join(', ');
-          }
-          else {
-            labelTooltipTitle = '';
-            $sidebarLabelTooltip.tooltip('destroy');
-          }
+              labelTooltipTitle = labelTitles.join(', ');
+            }
+            else {
+              labelTooltipTitle = '';
+              $sidebarLabelTooltip.tooltip('destroy');
+            }
 
-          $sidebarLabelTooltip
-            .attr('title', labelTooltipTitle)
-            .tooltip('fixTitle');
+            $sidebarLabelTooltip
+              .attr('title', labelTooltipTitle)
+              .tooltip('fixTitle');
 
-          $('.has-tooltip', $value).tooltip({
-            container: 'body'
-          });
-        });
+            $('.has-tooltip', $value).tooltip({
+              container: 'body'
+            });
+          })
+          .catch(() => flash(__('Error saving label update.')));
       };
       $dropdown.glDropdown({
         showMenuAbove: showMenuAbove,
         data: function(term, callback) {
-          return $.ajax({
-            url: labelUrl
-          }).done(function(data) {
-            data = _.chain(data).groupBy(function(label) {
-              return label.title;
-            }).map(function(label) {
-              var color;
-              color = _.map(label, function(dup) {
-                return dup.color;
-              });
-              return {
-                id: label[0].id,
-                title: label[0].title,
-                color: color,
-                duplicate: color.length > 1
-              };
-            }).value();
-            if ($dropdown.hasClass('js-extra-options')) {
-              var extraData = [];
-              if (showNo) {
-                extraData.unshift({
-                  id: 0,
-                  title: 'No Label'
+          axios.get(labelUrl)
+            .then((res) => {
+              let data = _.chain(res.data).groupBy(function(label) {
+                return label.title;
+              }).map(function(label) {
+                var color;
+                color = _.map(label, function(dup) {
+                  return dup.color;
                 });
+                return {
+                  id: label[0].id,
+                  title: label[0].title,
+                  color: color,
+                  duplicate: color.length > 1
+                };
+              }).value();
+              if ($dropdown.hasClass('js-extra-options')) {
+                var extraData = [];
+                if (showNo) {
+                  extraData.unshift({
+                    id: 0,
+                    title: 'No Label'
+                  });
+                }
+                if (showAny) {
+                  extraData.unshift({
+                    isAny: true,
+                    title: 'Any Label'
+                  });
+                }
+                if (extraData.length) {
+                  extraData.push('divider');
+                  data = extraData.concat(data);
+                }
               }
-              if (showAny) {
-                extraData.unshift({
-                  isAny: true,
-                  title: 'Any Label'
-                });
-              }
-              if (extraData.length) {
-                extraData.push('divider');
-                data = extraData.concat(data);
-              }
-            }
 
-            callback(data);
-            if (showMenuAbove) {
-              $dropdown.data('glDropdown').positionMenuAbove();
-            }
-          });
+              callback(data);
+              if (showMenuAbove) {
+                $dropdown.data('glDropdown').positionMenuAbove();
+              }
+            })
+            .catch(() => flash(__('Error fetching labels.')));
         },
         renderRow: function(label, instance) {
           var $a, $li, color, colorEl, indeterminate, removesAll, selectedClass, spacing, i, marked, dropdownName, dropdownValue;

app/assets/javascripts/lib/utils/ajax_cache.js

+import axios from './axios_utils';
 import Cache from './cache';
 
 class AjaxCache extends Cache {
@@ -18,25 +19,18 @@ class AjaxCache extends Cache {
     let pendingRequest = this.pendingRequests[endpoint];
 
     if (!pendingRequest) {
-      pendingRequest = new Promise((resolve, reject) => {
-        // jQuery 2 is not Promises/A+ compatible (missing catch)
-        $.ajax(endpoint) // eslint-disable-line promise/catch-or-return
-        .then(data => resolve(data),
-          (jqXHR, textStatus, errorThrown) => {
-            const error = new Error(`${endpoint}: ${errorThrown}`);
-            error.textStatus = textStatus;
-            reject(error);
-          },
-        );
-      })
-      .then((data) => {
-        this.internalStorage[endpoint] = data;
-        delete this.pendingRequests[endpoint];
-      })
-      .catch((error) => {
-        delete this.pendingRequests[endpoint];
-        throw error;
-      });
+      pendingRequest = axios.get(endpoint)
+        .then(({ data }) => {
+          this.internalStorage[endpoint] = data;
+          delete this.pendingRequests[endpoint];
+        })
+        .catch((e) => {
+          const error = new Error(`${endpoint}: ${e.message}`);
+          error.textStatus = e.message;
+
+          delete this.pendingRequests[endpoint];
+          throw error;
+        });
 
       this.pendingRequests[endpoint] = pendingRequest;
     }

app/assets/javascripts/lib/utils/axios_utils.js

@@ -19,6 +19,10 @@ axios.interceptors.response.use((config) => {
   window.activeVueResources -= 1;
 
   return config;
+}, (e) => {
+  window.activeVueResources -= 1;
+
+  return Promise.reject(e);
 });
 
 export default axios;

app/assets/javascripts/lib/utils/common_utils.js

-import { getLocationHash } from './url_utility';
 import axios from './axios_utils';
+import { getLocationHash } from './url_utility';
 
 export const getPagePath = (index = 0) => $('body').attr('data-page').split(':')[index];
 
@@ -28,16 +28,11 @@ export const isInIssuePage = () => {
   return page === 'issues' && action === 'show';
 };
 
-export const ajaxGet = url => $.ajax({
-  type: 'GET',
-  url,
-  dataType: 'script',
-});
-
-export const ajaxPost = (url, data) => $.ajax({
-  type: 'POST',
-  url,
-  data,
+export const ajaxGet = url => axios.get(url, {
+  params: { format: 'js' },
+  responseType: 'text',
+}).then(({ data }) => {
+  $.globalEval(data);
 });
 
 export const rstrip = (val) => {
@@ -412,7 +407,6 @@ window.gl.utils = {
   getGroupSlug,
   isInIssuePage,
   ajaxGet,
-  ajaxPost,
   rstrip,
   updateTooltipTitle,
   disableButtonIfEmptyField,

app/assets/javascripts/merge_conflicts/merge_conflict_service.js

 /* eslint-disable no-param-reassign, comma-dangle */
+import axios from '../lib/utils/axios_utils';
 
 ((global) => {
   global.mergeConflicts = global.mergeConflicts || {};
@@ -10,20 +11,11 @@
     }
 
     fetchConflictsData() {
-      return $.ajax({
-        dataType: 'json',
-        url: this.conflictsPath
-      });
+      return axios.get(this.conflictsPath);
     }
 
     submitResolveConflicts(data) {
-      return $.ajax({
-        url: this.resolveConflictsPath,
-        data: JSON.stringify(data),
-        contentType: 'application/json',
-        dataType: 'json',
-        method: 'POST'
-      });
+      return axios.post(this.resolveConflictsPath, data);
     }
   }
 

app/assets/javascripts/merge_conflicts/merge_conflicts_bundle.js

@@ -38,24 +38,23 @@ $(() => {
       showDiffViewTypeSwitcher() { return mergeConflictsStore.fileTextTypePresent(); }
     },
     created() {
-      mergeConflictsService
-        .fetchConflictsData()
-        .done((data) => {
+      mergeConflictsService.fetchConflictsData()
+        .then(({ data }) => {
           if (data.type === 'error') {
             mergeConflictsStore.setFailedRequest(data.message);
           } else {
             mergeConflictsStore.setConflictsData(data);
           }
-        })
-        .error(() => {
-          mergeConflictsStore.setFailedRequest();
-        })
-        .always(() => {
+
           mergeConflictsStore.setLoadingState(false);
 
           this.$nextTick(() => {
             syntaxHighlight($('.js-syntax-highlight'));
           });
+        })
+        .catch(() => {
+          mergeConflictsStore.setLoadingState(false);
+          mergeConflictsStore.setFailedRequest();
         });
     },
     methods: {
@@ -82,10 +81,10 @@ $(() => {
 
         mergeConflictsService
           .submitResolveConflicts(mergeConflictsStore.getCommitData())
-          .done((data) => {
+          .then(({ data }) => {
             window.location.href = data.redirect_to;
           })
-          .error(() => {
+          .catch(() => {
             mergeConflictsStore.setSubmitState(false);
             new Flash('Failed to save merge conflicts resolutions. Please try again!');
           });

app/assets/javascripts/merge_request_tabs.js

 /* eslint-disable no-new, class-methods-use-this */
 
 import Cookies from 'js-cookie';
-import Flash from './flash';
+import axios from './lib/utils/axios_utils';
+import flash from './flash';
 import BlobForkSuggestion from './blob/blob_fork_suggestion';
 import initChangesDropdown from './init_changes_dropdown';
 import bp from './breakpoints';
@@ -244,15 +245,22 @@ export default class MergeRequestTabs {
     if (this.commitsLoaded) {
       return;
     }
-    this.ajaxGet({
-      url: `${source}.json`,
-      success: (data) => {
+
+    this.toggleLoading(true);
+
+    axios.get(`${source}.json`)
+      .then(({ data }) => {
         document.querySelector('div#commits').innerHTML = data.html;
         localTimeAgo($('.js-timeago', 'div#commits'));
         this.commitsLoaded = true;
         this.scrollToElement('#commits');
-      },
-    });
+
+        this.toggleLoading(false);
+      })
+      .catch(() => {
+        this.toggleLoading(false);
+        flash('An error occurred while fetching this tab.');
+      });
   }
 
   mountPipelinesView() {
@@ -283,9 +291,10 @@ export default class MergeRequestTabs {
     // some pages like MergeRequestsController#new has query parameters on that anchor
     const urlPathname = parseUrlPathname(source);
 
-    this.ajaxGet({
-      url: `${urlPathname}.json${location.search}`,
-      success: (data) => {
+    this.toggleLoading(true);
+
+    axios.get(`${urlPathname}.json${location.search}`)
+      .then(({ data }) => {
         const $container = $('#diffs');
         $container.html(data.html);
 
@@ -335,8 +344,13 @@ export default class MergeRequestTabs {
           // (discussion and diff tabs) and `:target` only applies to the first
           anchor.addClass('target');
         }
-      },
-    });
+
+        this.toggleLoading(false);
+      })
+      .catch(() => {
+        this.toggleLoading(false);
+        flash('An error occurred while fetching this tab.');
+      });
   }
 
   // Show or hide the loading spinner
@@ -346,17 +360,6 @@ export default class MergeRequestTabs {
     $('.mr-loading-status .loading').toggle(status);
   }
 
-  ajaxGet(options) {
-    const defaults = {
-      beforeSend: () => this.toggleLoading(true),
-      error: () => new Flash('An error occurred while fetching this tab.', 'alert'),
-      complete: () => this.toggleLoading(false),
-      dataType: 'json',
-      type: 'GET',
-    };
-    $.ajax($.extend({}, defaults, options));
-  }
-
   diffViewType() {
     return $('.inline-parallel-buttons a.active').data('view-type');
   }

app/assets/javascripts/milestone.js

-import Flash from './flash';
+import axios from './lib/utils/axios_utils';
+import flash from './flash';
 
 export default class Milestone {
   constructor() {
@@ -33,15 +34,12 @@ export default class Milestone {
     const tabElId = $target.attr('href');
 
     if (endpoint && !$target.hasClass('is-loaded')) {
-      $.ajax({
-        url: endpoint,
-        dataType: 'JSON',
-      })
-      .fail(() => new Flash('Error loading milestone tab'))
-      .done((data) => {
-        $(tabElId).html(data.html);
-        $target.addClass('is-loaded');
-      });
+      axios.get(endpoint)
+        .then(({ data }) => {
+          $(tabElId).html(data.html);
+          $target.addClass('is-loaded');
+        })
+        .catch(() => flash('Error loading milestone tab'));
     }
   }
 }

app/assets/javascripts/milestone_select.js

@@ -2,6 +2,7 @@
 /* global Issuable */
 /* global ListMilestone */
 import _ from 'underscore';
+import axios from './lib/utils/axios_utils';
 import { timeFor } from './lib/utils/datetime_utility';
 
 export default class MilestoneSelect {
@@ -52,48 +53,47 @@ export default class MilestoneSelect {
       }
       return $dropdown.glDropdown({
         showMenuAbove: showMenuAbove,
-        data: (term, callback) => $.ajax({
-          url: milestonesUrl
-        }).done((data) => {
-          const extraOptions = [];
-          if (showAny) {
-            extraOptions.push({
-              id: 0,
-              name: '',
-              title: 'Any Milestone'
-            });
-          }
-          if (showNo) {
-            extraOptions.push({
-              id: -1,
-              name: 'No Milestone',
-              title: 'No Milestone'
-            });
-          }
-          if (showUpcoming) {
-            extraOptions.push({
-              id: -2,
-              name: '#upcoming',
-              title: 'Upcoming'
-            });
-          }
-          if (showStarted) {
-            extraOptions.push({
-              id: -3,
-              name: '#started',
-              title: 'Started'
-            });
-          }
-          if (extraOptions.length) {
-            extraOptions.push('divider');
-          }
+        data: (term, callback) => axios.get(milestonesUrl)
+          .then(({ data }) => {
+            const extraOptions = [];
+            if (showAny) {
+              extraOptions.push({
+                id: 0,
+                name: '',
+                title: 'Any Milestone'
+              });
+            }
+            if (showNo) {
+              extraOptions.push({
+                id: -1,
+                name: 'No Milestone',
+                title: 'No Milestone'
+              });
+            }
+            if (showUpcoming) {
+              extraOptions.push({
+                id: -2,
+                name: '#upcoming',
+                title: 'Upcoming'
+              });
+            }
+            if (showStarted) {
+              extraOptions.push({
+                id: -3,
+                name: '#started',
+                title: 'Started'
+              });
+            }
+            if (extraOptions.length) {
+              extraOptions.push('divider');
+            }
 
-          callback(extraOptions.concat(data));
-          if (showMenuAbove) {
-            $dropdown.data('glDropdown').positionMenuAbove();
-          }
-          $(`[data-milestone-id="${selectedMilestone}"] > a`).addClass('is-active');
-        }),
+            callback(extraOptions.concat(data));
+            if (showMenuAbove) {
+              $dropdown.data('glDropdown').positionMenuAbove();
+            }
+            $(`[data-milestone-id="${selectedMilestone}"] > a`).addClass('is-active');
+          }),
         renderRow: milestone => `
           <li data-milestone-id="${milestone.name}">
             <a href='#' class='dropdown-menu-milestone-link'>
@@ -200,26 +200,23 @@ export default class MilestoneSelect {
             data[abilityName].milestone_id = selected != null ? selected : null;
             $loading.removeClass('hidden').fadeIn();
             $dropdown.trigger('loading.gl.dropdown');
-            return $.ajax({
-              type: 'PUT',
-              url: issueUpdateURL,
-              data: data
-            }).done((data) => {
-              $dropdown.trigger('loaded.gl.dropdown');
-              $loading.fadeOut();
-              $selectBox.hide();
-              $value.css('display', '');
-              if (data.milestone != null) {
-                data.milestone.full_path = this.currentProject.full_path;
-                data.milestone.remaining = timeFor(data.milestone.due_date);
-                data.milestone.name = data.milestone.title;
-                $value.html(milestoneLinkTemplate(data.milestone));
-                return $sidebarCollapsedValue.find('span').html(collapsedSidebarLabelTemplate(data.milestone));
-              } else {
-                $value.html(milestoneLinkNoneTemplate);
-                return $sidebarCollapsedValue.find('span').text('No');
-              }
-            });
+            return axios.put(issueUpdateURL, data)
+              .then(({ data }) => {
+                $dropdown.trigger('loaded.gl.dropdown');
+                $loading.fadeOut();
+                $selectBox.hide();
+                $value.css('display', '');
+                if (data.milestone != null) {
+                  data.milestone.full_path = this.currentProject.full_path;
+                  data.milestone.remaining = timeFor(data.milestone.due_date);
+                  data.milestone.name = data.milestone.title;
+                  $value.html(milestoneLinkTemplate(data.milestone));
+                  return $sidebarCollapsedValue.find('span').html(collapsedSidebarLabelTemplate(data.milestone));
+                } else {
+                  $value.html(milestoneLinkNoneTemplate);
+                  return $sidebarCollapsedValue.find('span').text('No');
+                }
+              });
           }
         }
       });

app/assets/javascripts/notes.js

@@ -18,13 +18,14 @@ import 'vendor/jquery.atwho';
 import AjaxCache from '~/lib/utils/ajax_cache';
 import axios from './lib/utils/axios_utils';
 import { getLocationHash } from './lib/utils/url_utility';
+import axios from './lib/utils/axios_utils';
 import Flash from './flash';
 import CommentTypeToggle from './comment_type_toggle';
 import GLForm from './gl_form';
 import loadAwardsHandler from './awards_handler';
 import Autosave from './autosave';
 import TaskList from './task_list';
-import { ajaxPost, isInViewport, getPagePath, scrollToElement, isMetaKey } from './lib/utils/common_utils';
+import { isInViewport, getPagePath, scrollToElement, isMetaKey } from './lib/utils/common_utils';
 import imageDiffHelper from './image_diff/helpers/index';
 import { localTimeAgo } from './lib/utils/datetime_utility';
 
@@ -1399,7 +1400,7 @@ export default class Notes {
    * 2) Identify comment type; a) Main thread b) Discussion thread c) Discussion resolve
    * 3) Build temporary placeholder element (using `createPlaceholderNote`)
    * 4) Show placeholder note on UI
-   * 5) Perform network request to submit the note using `ajaxPost`
+   * 5) Perform network request to submit the note using `axios.post`
    *    a) If request is successfully completed
    *        1. Remove placeholder element
    *        2. Show submitted Note element
@@ -1481,8 +1482,10 @@ export default class Notes {
 
     /* eslint-disable promise/catch-or-return */
     // Make request to submit comment on server
-    ajaxPost(formAction, formData)
-      .then((note) => {
+    axios.post(formAction, formData)
+      .then((res) => {
+        const note = res.data;
+
         // Submission successful! remove placeholder
         $notesContainer.find(`#${noteUniqueId}`).remove();
 
@@ -1555,7 +1558,7 @@ export default class Notes {
         }
 
         $form.trigger('ajax:success', [note]);
-      }).fail(() => {
+      }).catch(() => {
         // Submission failed, remove placeholder note and show Flash error message
         $notesContainer.find(`#${noteUniqueId}`).remove();
 
@@ -1594,7 +1597,7 @@ export default class Notes {
    *
    * 1) Get Form metadata
    * 2) Update note element with new content
-   * 3) Perform network request to submit the updated note using `ajaxPost`
+   * 3) Perform network request to submit the updated note using `axios.post`
    *    a) If request is successfully completed
    *        1. Show submitted Note element
    *    b) If request failed
@@ -1625,12 +1628,12 @@ export default class Notes {
 
     /* eslint-disable promise/catch-or-return */
     // Make request to update comment on server
-    ajaxPost(formAction, formData)
-      .then((note) => {
+    axios.post(formAction, formData)
+      .then(({ data }) => {
         // Submission successful! render final note element
-        this.updateNote(note, $editingNote);
+        this.updateNote(data, $editingNote);
       })
-      .fail(() => {
+      .catch(() => {
         // Submission failed, revert back to original note
         $noteBodyText.html(_.escape(cachedNoteBodyText));
         $editingNote.removeClass('being-posted fade-in');

spec/javascripts/issue_spec.js

 /* eslint-disable space-before-function-paren, one-var, one-var-declaration-per-line, no-use-before-define, comma-dangle, max-len */
+import MockAdapter from 'axios-mock-adapter';
+import axios from '~/lib/utils/axios_utils';
 import Issue from '~/issue';
 import '~/lib/utils/text_utility';
 
@@ -88,20 +90,24 @@ describe('Issue', function() {
   [true, false].forEach((isIssueInitiallyOpen) => {
     describe(`with ${isIssueInitiallyOpen ? 'open' : 'closed'} issue`, function() {
       const action = isIssueInitiallyOpen ? 'close' : 'reopen';
+      let mock;
 
-      function ajaxSpy(req) {
-        if (req.url === this.$triggeredButton.attr('href')) {
-          expect(req.type).toBe('PUT');
+      function mockCloseButtonResponseSuccess(url, response) {
+        mock.onPut(url).reply(() => {
           expectNewBranchButtonState(true, false);
-          return this.issueStateDeferred;
-        } else if (req.url === Issue.createMrDropdownWrap.dataset.canCreatePath) {
-          expect(req.type).toBe('GET');
-          expectNewBranchButtonState(true, false);
-          return this.canCreateBranchDeferred;
-        }
 
-        expect(req.url).toBe('unexpected');
-        return null;
+          return [200, response];
+        });
+      }
+
+      function mockCloseButtonResponseError(url) {
+        mock.onPut(url).networkError();
+      }
+
+      function mockCanCreateBranch(canCreateBranch) {
+        mock.onGet(/(.*)\/can_create_branch$/).reply(200, {
+          can_create_branch: canCreateBranch,
+        });
       }
 
       beforeEach(function() {
@@ -111,6 +117,11 @@ describe('Issue', function() {
           loadFixtures('issues/closed-issue.html.raw');
         }
 
+        mock = new MockAdapter(axios);
+
+        mock.onGet(/(.*)\/related_branches$/).reply(200, {});
+        mock.onGet(/(.*)\/referenced_merge_requests$/).reply(200, {});
+
         findElements(isIssueInitiallyOpen);
         this.issue = new Issue();
         expectIssueState(isIssueInitiallyOpen);
@@ -120,71 +131,89 @@ describe('Issue', function() {
         this.$projectIssuesCounter = $('.issue_counter').first();
         this.$projectIssuesCounter.text('1,001');
 
-        this.issueStateDeferred = new jQuery.Deferred();
-        this.canCreateBranchDeferred = new jQuery.Deferred();
+        spyOn(axios, 'get').and.callThrough();
+      });
 
-        spyOn(jQuery, 'ajax').and.callFake(ajaxSpy.bind(this));
+      afterEach(() => {
+        mock.restore();
+        $('div.flash-alert').remove();
       });
 
-      it(`${action}s the issue`, function() {
-        this.$triggeredButton.trigger('click');
-        this.issueStateDeferred.resolve({
+      it(`${action}s the issue`, function(done) {
+        mockCloseButtonResponseSuccess(this.$triggeredButton.attr('href'), {
           id: 34
         });
-        this.canCreateBranchDeferred.resolve({
-          can_create_branch: !isIssueInitiallyOpen
-        });
+        mockCanCreateBranch(!isIssueInitiallyOpen);
 
-        expectIssueState(!isIssueInitiallyOpen);
-        expect(this.$triggeredButton.get(0).getAttribute('disabled')).toBeNull();
-        expect(this.$projectIssuesCounter.text()).toBe(isIssueInitiallyOpen ? '1,000' : '1,002');
-        expectNewBranchButtonState(false, !isIssueInitiallyOpen);
+        this.$triggeredButton.trigger('click');
+
+        setTimeout(() => {
+          expectIssueState(!isIssueInitiallyOpen);
+          expect(this.$triggeredButton.get(0).getAttribute('disabled')).toBeNull();
+          expect(this.$projectIssuesCounter.text()).toBe(isIssueInitiallyOpen ? '1,000' : '1,002');
+          expectNewBranchButtonState(false, !isIssueInitiallyOpen);
+
+          done();
+        });
       });
 
-      it(`fails to ${action} the issue if saved:false`, function() {
-        this.$triggeredButton.trigger('click');
-        this.issueStateDeferred.resolve({
+      it(`fails to ${action} the issue if saved:false`, function(done) {
+        mockCloseButtonResponseSuccess(this.$triggeredButton.attr('href'), {
           saved: false
         });
-        this.canCreateBranchDeferred.resolve({
-          can_create_branch: isIssueInitiallyOpen
-        });
+        mockCanCreateBranch(isIssueInitiallyOpen);
 
-        expectIssueState(isIssueInitiallyOpen);
-        expect(this.$triggeredButton.get(0).getAttribute('disabled')).toBeNull();
-        expectErrorMessage();
-        expect(this.$projectIssuesCounter.text()).toBe('1,001');
-        expectNewBranchButtonState(false, isIssueInitiallyOpen);
+        this.$triggeredButton.trigger('click');
+
+        setTimeout(() => {
+          expectIssueState(isIssueInitiallyOpen);
+          expect(this.$triggeredButton.get(0).getAttribute('disabled')).toBeNull();
+          expectErrorMessage();
+          expect(this.$projectIssuesCounter.text()).toBe('1,001');
+          expectNewBranchButtonState(false, isIssueInitiallyOpen);
+
+          done();
+        });
       });
 
-      it(`fails to ${action} the issue if HTTP error occurs`, function() {
+      it(`fails to ${action} the issue if HTTP error occurs`, function(done) {
+        mockCloseButtonResponseError(this.$triggeredButton.attr('href'));
+        mockCanCreateBranch(isIssueInitiallyOpen);
+
         this.$triggeredButton.trigger('click');
-        this.issueStateDeferred.reject();
-        this.canCreateBranchDeferred.resolve({
-          can_create_branch: isIssueInitiallyOpen
-        });
 
-        expectIssueState(isIssueInitiallyOpen);
-        expect(this.$triggeredButton.get(0).getAttribute('disabled')).toBeNull();
-        expectErrorMessage();
-        expect(this.$projectIssuesCounter.text()).toBe('1,001');
-        expectNewBranchButtonState(false, isIssueInitiallyOpen);
+        setTimeout(() => {
+          expectIssueState(isIssueInitiallyOpen);
+          expect(this.$triggeredButton.get(0).getAttribute('disabled')).toBeNull();
+          expectErrorMessage();
+          expect(this.$projectIssuesCounter.text()).toBe('1,001');
+          expectNewBranchButtonState(false, isIssueInitiallyOpen);
+
+          done();
+        });
       });
 
       it('disables the new branch button if Ajax call fails', function() {
+        mockCloseButtonResponseError(this.$triggeredButton.attr('href'));
+        mock.onGet(/(.*)\/can_create_branch$/).networkError();
+
         this.$triggeredButton.trigger('click');
-        this.issueStateDeferred.reject();
-        this.canCreateBranchDeferred.reject();
 
         expectNewBranchButtonState(false, false);
       });
 
-      it('does not trigger Ajax call if new branch button is missing', function() {
+      it('does not trigger Ajax call if new branch button is missing', function(done) {
+        mockCloseButtonResponseError(this.$triggeredButton.attr('href'));
         Issue.$btnNewBranch = $();
         this.canCreateBranchDeferred = null;
 
         this.$triggeredButton.trigger('click');
-        this.issueStateDeferred.reject();
+
+        setTimeout(() => {
+          expect(axios.get).not.toHaveBeenCalled();
+
+          done();
+        });
       });
     });
   });

spec/javascripts/job_spec.js

+import MockAdapter from 'axios-mock-adapter';
+import axios from '~/lib/utils/axios_utils';
 import { numberToHumanSize } from '~/lib/utils/number_utils';
 import * as urlUtils from '~/lib/utils/url_utility';
 import '~/lib/utils/datetime_utility';
@@ -6,11 +8,29 @@ import '~/breakpoints';
 
 describe('Job', () => {
   const JOB_URL = `${gl.TEST_HOST}/frontend-fixtures/builds-project/-/jobs/1`;
+  let mock;
+  let response;
+
+  function waitForPromise() {
+    return new Promise(resolve => requestAnimationFrame(resolve));
+  }
 
   preloadFixtures('builds/build-with-artifacts.html.raw');
 
   beforeEach(() => {
     loadFixtures('builds/build-with-artifacts.html.raw');
+
+    spyOn(urlUtils, 'visitUrl');
+
+    mock = new MockAdapter(axios);
+
+    mock.onGet(new RegExp(`${JOB_URL}/trace.json?(.*)`)).reply(() => [200, response]);
+  });
+
+  afterEach(() => {
+    mock.restore();
+
+    response = {};
   });
 
   describe('class constructor', () => {
@@ -55,161 +75,159 @@ describe('Job', () => {
     });
 
     describe('running build', () => {
-      it('updates the build trace on an interval', function () {
-        const deferred1 = $.Deferred();
-        const deferred2 = $.Deferred();
-        spyOn($, 'ajax').and.returnValues(deferred1.promise(), deferred2.promise());
-        spyOn(urlUtils, 'visitUrl');
-
-        deferred1.resolve({
+      it('updates the build trace on an interval', function (done) {
+        response = {
           html: '<span>Update<span>',
           status: 'running',
           state: 'newstate',
           append: true,
           complete: false,
-        });
-
-        deferred2.resolve({
-          html: '<span>More</span>',
-          status: 'running',
-          state: 'finalstate',
-          append: true,
-          complete: true,
-        });
+        };
 
         this.job = new Job();
 
-        expect($('#build-trace .js-build-output').text()).toMatch(/Update/);
-        expect(this.job.state).toBe('newstate');
-
-        jasmine.clock().tick(4001);
-
-        expect($('#build-trace .js-build-output').text()).toMatch(/UpdateMore/);
-        expect(this.job.state).toBe('finalstate');
+        waitForPromise()
+          .then(() => {
+            expect($('#build-trace .js-build-output').text()).toMatch(/Update/);
+            expect(this.job.state).toBe('newstate');
+
+            response = {
+              html: '<span>More</span>',
+              status: 'running',
+              state: 'finalstate',
+              append: true,
+              complete: true,
+            };
+          })
+          .then(() => jasmine.clock().tick(4001))
+          .then(waitForPromise)
+          .then(() => {
+            expect($('#build-trace .js-build-output').text()).toMatch(/UpdateMore/);
+            expect(this.job.state).toBe('finalstate');
+          })
+          .then(done)
+          .catch(done.fail);
       });
 
-      it('replaces the entire build trace', () => {
-        const deferred1 = $.Deferred();
-        const deferred2 = $.Deferred();
-
-        spyOn($, 'ajax').and.returnValues(deferred1.promise(), deferred2.promise());
-
-        spyOn(urlUtils, 'visitUrl');
-
-        deferred1.resolve({
+      it('replaces the entire build trace', (done) => {
+        response = {
           html: '<span>Update<span>',
           status: 'running',
           append: false,
           complete: false,
-        });
-
-        deferred2.resolve({
-          html: '<span>Different</span>',
-          status: 'running',
-          append: false,
-        });
+        };
 
         this.job = new Job();
 
-        expect($('#build-trace .js-build-output').text()).toMatch(/Update/);
-
-        jasmine.clock().tick(4001);
-
-        expect($('#build-trace .js-build-output').text()).not.toMatch(/Update/);
-        expect($('#build-trace .js-build-output').text()).toMatch(/Different/);
+        waitForPromise()
+          .then(() => {
+            expect($('#build-trace .js-build-output').text()).toMatch(/Update/);
+
+            response = {
+              html: '<span>Different</span>',
+              status: 'running',
+              append: false,
+            };
+          })
+          .then(() => jasmine.clock().tick(4001))
+          .then(waitForPromise)
+          .then(() => {
+            expect($('#build-trace .js-build-output').text()).not.toMatch(/Update/);
+            expect($('#build-trace .js-build-output').text()).toMatch(/Different/);
+          })
+          .then(done)
+          .catch(done.fail);
       });
     });
 
     describe('truncated information', () => {
       describe('when size is less than total', () => {
-        it('shows information about truncated log', () => {
-          spyOn(urlUtils, 'visitUrl');
-          const deferred = $.Deferred();
-          spyOn($, 'ajax').and.returnValue(deferred.promise());
-
-          deferred.resolve({
+        it('shows information about truncated log', (done) => {
+          response = {
             html: '<span>Update</span>',
             status: 'success',
             append: false,
             size: 50,
             total: 100,
-          });
+          };
 
           this.job = new Job();
 
-          expect(document.querySelector('.js-truncated-info').classList).not.toContain('hidden');
+          waitForPromise()
+            .then(() => {
+              expect(document.querySelector('.js-truncated-info').classList).not.toContain('hidden');
+            })
+            .then(done)
+            .catch(done.fail);
         });
 
-        it('shows the size in KiB', () => {
+        it('shows the size in KiB', (done) => {
           const size = 50;
-          spyOn(urlUtils, 'visitUrl');
-          const deferred = $.Deferred();
 
-          spyOn($, 'ajax').and.returnValue(deferred.promise());
-          deferred.resolve({
+          response = {
             html: '<span>Update</span>',
             status: 'success',
             append: false,
             size,
             total: 100,
-          });
+          };
 
           this.job = new Job();
 
-          expect(
-            document.querySelector('.js-truncated-info-size').textContent.trim(),
-          ).toEqual(`${numberToHumanSize(size)}`);
+          waitForPromise()
+            .then(() => {
+              expect(
+                document.querySelector('.js-truncated-info-size').textContent.trim(),
+              ).toEqual(`${numberToHumanSize(size)}`);
+            })
+            .then(done)
+            .catch(done.fail);
         });
 
-        it('shows incremented size', () => {
-          const deferred1 = $.Deferred();
-          const deferred2 = $.Deferred();
-
-          spyOn($, 'ajax').and.returnValues(deferred1.promise(), deferred2.promise());
-
-          spyOn(urlUtils, 'visitUrl');
-
-          deferred1.resolve({
+        it('shows incremented size', (done) => {
+          response = {
             html: '<span>Update</span>',
             status: 'success',
             append: false,
             size: 50,
             total: 100,
-          });
+          };
 
           this.job = new Job();
 
-          expect(
-            document.querySelector('.js-truncated-info-size').textContent.trim(),
-          ).toEqual(`${numberToHumanSize(50)}`);
-
-          jasmine.clock().tick(4001);
-
-          deferred2.resolve({
-            html: '<span>Update</span>',
-            status: 'success',
-            append: true,
-            size: 10,
-            total: 100,
-          });
-
-          expect(
-            document.querySelector('.js-truncated-info-size').textContent.trim(),
-          ).toEqual(`${numberToHumanSize(60)}`);
+          waitForPromise()
+            .then(() => {
+              expect(
+                document.querySelector('.js-truncated-info-size').textContent.trim(),
+              ).toEqual(`${numberToHumanSize(50)}`);
+
+              response = {
+                html: '<span>Update</span>',
+                status: 'success',
+                append: true,
+                size: 10,
+                total: 100,
+              };
+            })
+            .then(() => jasmine.clock().tick(4001))
+            .then(waitForPromise)
+            .then(() => {
+              expect(
+                document.querySelector('.js-truncated-info-size').textContent.trim(),
+              ).toEqual(`${numberToHumanSize(60)}`);
+            })
+            .then(done)
+            .catch(done.fail);
         });
 
         it('renders the raw link', () => {
-          const deferred = $.Deferred();
-          spyOn(urlUtils, 'visitUrl');
-
-          spyOn($, 'ajax').and.returnValue(deferred.promise());
-          deferred.resolve({
+          response = {
             html: '<span>Update</span>',
             status: 'success',
             append: false,
             size: 50,
             total: 100,
-          });
+          };
 
           this.job = new Job();
 
@@ -220,50 +238,50 @@ describe('Job', () => {
       });
 
       describe('when size is equal than total', () => {
-        it('does not show the trunctated information', () => {
-          const deferred = $.Deferred();
-          spyOn(urlUtils, 'visitUrl');
-
-          spyOn($, 'ajax').and.returnValue(deferred.promise());
-          deferred.resolve({
+        it('does not show the trunctated information', (done) => {
+          response = {
             html: '<span>Update</span>',
             status: 'success',
             append: false,
             size: 100,
             total: 100,
-          });
+          };
 
           this.job = new Job();
 
-          expect(document.querySelector('.js-truncated-info').classList).toContain('hidden');
+          waitForPromise()
+            .then(() => {
+              expect(document.querySelector('.js-truncated-info').classList).toContain('hidden');
+            })
+            .then(done)
+            .catch(done.fail);
         });
       });
     });
 
     describe('output trace', () => {
-      beforeEach(() => {
-        const deferred = $.Deferred();
-        spyOn(urlUtils, 'visitUrl');
-
-        spyOn($, 'ajax').and.returnValue(deferred.promise());
-        deferred.resolve({
+      beforeEach((done) => {
+        response = {
           html: '<span>Update</span>',
           status: 'success',
           append: false,
           size: 50,
           total: 100,
-        });
+        };
 
         this.job = new Job();
+
+        waitForPromise()
+          .then(done)
+          .catch(done.fail);
       });
 
       it('should render trace controls', () => {
         const controllers = document.querySelector('.controllers');
 
-        expect(controllers.querySelector('.js-raw-link-controller')).toBeDefined();
-        expect(controllers.querySelector('.js-erase-link')).toBeDefined();
-        expect(controllers.querySelector('.js-scroll-up')).toBeDefined();
-        expect(controllers.querySelector('.js-scroll-down')).toBeDefined();
+        expect(controllers.querySelector('.js-raw-link-controller')).not.toBeNull();
+        expect(controllers.querySelector('.js-scroll-up')).not.toBeNull();
+        expect(controllers.querySelector('.js-scroll-down')).not.toBeNull();
       });
 
       it('should render received output', () => {
@@ -276,13 +294,13 @@ describe('Job', () => {
 
   describe('getBuildTrace', () => {
     it('should request build trace with state parameter', (done) => {
-      spyOn(jQuery, 'ajax').and.callThrough();
+      spyOn(axios, 'get').and.callThrough();
       // eslint-disable-next-line no-new
       new Job();
 
       setTimeout(() => {
-        expect(jQuery.ajax).toHaveBeenCalledWith(
-          { url: `${JOB_URL}/trace.json`, data: { state: '' } },
+        expect(axios.get).toHaveBeenCalledWith(
+          `${JOB_URL}/trace.json`, { params: { state: '' } },
         );
         done();
       }, 0);

spec/javascripts/labels_issue_sidebar_spec.js

 /* eslint-disable no-new */
+import MockAdapter from 'axios-mock-adapter';
+import axios from '~/lib/utils/axios_utils';
 import IssuableContext from '~/issuable_context';
 import LabelsSelect from '~/labels_select';
 
@@ -10,35 +12,44 @@ import '~/users_select';
 
 (() => {
   let saveLabelCount = 0;
+  let mock;
+
   describe('Issue dropdown sidebar', () => {
     preloadFixtures('static/issue_sidebar_label.html.raw');
 
     beforeEach(() => {
       loadFixtures('static/issue_sidebar_label.html.raw');
+
+      mock = new MockAdapter(axios);
+
       new IssuableContext('{"id":1,"name":"Administrator","username":"root"}');
       new LabelsSelect();
 
-      spyOn(jQuery, 'ajax').and.callFake((req) => {
-        const d = $.Deferred();
-        let LABELS_DATA = [];
+      mock.onGet('/root/test/labels.json').reply(() => {
+        const labels = Array(10).fill().map((_, i) => ({
+          id: i,
+          title: `test ${i}`,
+          color: '#5CB85C',
+        }));
 
-        if (req.url === '/root/test/labels.json') {
-          for (let i = 0; i < 10; i += 1) {
-            LABELS_DATA.push({ id: i, title: `test ${i}`, color: '#5CB85C' });
-          }
-        } else if (req.url === '/root/test/issues/2.json') {
-          const tmp = [];
-          for (let i = 0; i < saveLabelCount; i += 1) {
-            tmp.push({ id: i, title: `test ${i}`, color: '#5CB85C' });
-          }
-          LABELS_DATA = { labels: tmp };
-        }
+        return [200, labels];
+      });
+
+      mock.onPut('/root/test/issues/2.json').reply(() => {
+        const labels = Array(saveLabelCount).fill().map((_, i) => ({
+          id: i,
+          title: `test ${i}`,
+          color: '#5CB85C',
+        }));
 
-        d.resolve(LABELS_DATA);
-        return d.promise();
+        return [200, { labels }];
       });
     });
 
+    afterEach(() => {
+      mock.restore();
+    });
+
     it('changes collapsed tooltip when changing labels when less than 5', (done) => {
       saveLabelCount = 5;
       $('.edit-link').get(0).click();

spec/javascripts/lib/utils/ajax_cache_spec.js

+import MockAdapter from 'axios-mock-adapter';
+import axios from '~/lib/utils/axios_utils';
 import AjaxCache from '~/lib/utils/ajax_cache';
 
 describe('AjaxCache', () => {
@@ -87,66 +89,53 @@ describe('AjaxCache', () => {
   });
 
   describe('retrieve', () => {
-    let ajaxSpy;
+    let mock;
 
     beforeEach(() => {
-      spyOn(jQuery, 'ajax').and.callFake(url => ajaxSpy(url));
+      mock = new MockAdapter(axios);
+
+      spyOn(axios, 'get').and.callThrough();
+    });
+
+    afterEach(() => {
+      mock.restore();
     });
 
     it('stores and returns data from Ajax call if cache is empty', (done) => {
-      ajaxSpy = (url) => {
-        expect(url).toBe(dummyEndpoint);
-        const deferred = $.Deferred();
-        deferred.resolve(dummyResponse);
-        return deferred.promise();
-      };
+      mock.onGet(dummyEndpoint).reply(200, dummyResponse);
 
       AjaxCache.retrieve(dummyEndpoint)
       .then((data) => {
-        expect(data).toBe(dummyResponse);
-        expect(AjaxCache.internalStorage[dummyEndpoint]).toBe(dummyResponse);
+        expect(data).toEqual(dummyResponse);
+        expect(AjaxCache.internalStorage[dummyEndpoint]).toEqual(dummyResponse);
       })
       .then(done)
       .catch(fail);
     });
 
-    it('makes no Ajax call if request is pending', () => {
-      const responseDeferred = $.Deferred();
-
-      ajaxSpy = (url) => {
-        expect(url).toBe(dummyEndpoint);
-        // neither reject nor resolve to keep request pending
-        return responseDeferred.promise();
-      };
-
-      const unexpectedResponse = data => fail(`Did not expect response: ${data}`);
+    it('makes no Ajax call if request is pending', (done) => {
+      mock.onGet(dummyEndpoint).reply(200, dummyResponse);
 
       AjaxCache.retrieve(dummyEndpoint)
-      .then(unexpectedResponse)
+      .then(done)
       .catch(fail);
 
       AjaxCache.retrieve(dummyEndpoint)
-      .then(unexpectedResponse)
+      .then(done)
       .catch(fail);
 
-      expect($.ajax.calls.count()).toBe(1);
+      expect(axios.get.calls.count()).toBe(1);
     });
 
     it('returns undefined if Ajax call fails and cache is empty', (done) => {
-      const dummyStatusText = 'exploded';
-      const dummyErrorMessage = 'server exploded';
-      ajaxSpy = (url) => {
-        expect(url).toBe(dummyEndpoint);
-        const deferred = $.Deferred();
-        deferred.reject(null, dummyStatusText, dummyErrorMessage);
-        return deferred.promise();
-      };
+      const errorMessage = 'Network Error';
+      mock.onGet(dummyEndpoint).networkError();
 
       AjaxCache.retrieve(dummyEndpoint)
       .then(data => fail(`Received unexpected data: ${JSON.stringify(data)}`))
       .catch((error) => {
-        expect(error.message).toBe(`${dummyEndpoint}: ${dummyErrorMessage}`);
-        expect(error.textStatus).toBe(dummyStatusText);
+        expect(error.message).toBe(`${dummyEndpoint}: ${errorMessage}`);
+        expect(error.textStatus).toBe(errorMessage);
         done();
       })
       .catch(fail);
@@ -154,7 +143,9 @@ describe('AjaxCache', () => {
 
     it('makes no Ajax call if matching data exists', (done) => {
       AjaxCache.internalStorage[dummyEndpoint] = dummyResponse;
-      ajaxSpy = () => fail(new Error('expected no Ajax call!'));
+      mock.onGet(dummyEndpoint).reply(() => {
+        fail(new Error('expected no Ajax call!'));
+      });
 
       AjaxCache.retrieve(dummyEndpoint)
       .then((data) => {
@@ -171,12 +162,7 @@ describe('AjaxCache', () => {
 
       AjaxCache.internalStorage[dummyEndpoint] = oldDummyResponse;
 
-      ajaxSpy = (url) => {
-        expect(url).toBe(dummyEndpoint);
-        const deferred = $.Deferred();
-        deferred.resolve(dummyResponse);
-        return deferred.promise();
-      };
+      mock.onGet(dummyEndpoint).reply(200, dummyResponse);
 
       // Call without forceRetrieve param
       AjaxCache.retrieve(dummyEndpoint)
@@ -189,7 +175,7 @@ describe('AjaxCache', () => {
       // Call with forceRetrieve param
       AjaxCache.retrieve(dummyEndpoint, true)
         .then((data) => {
-          expect(data).toBe(dummyResponse);
+          expect(data).toEqual(dummyResponse);
         })
         .then(done)
         .catch(fail);

spec/javascripts/lib/utils/common_utils_spec.js

 /* eslint-disable promise/catch-or-return */
-
-import * as commonUtils from '~/lib/utils/common_utils';
 import axios from '~/lib/utils/axios_utils';
+import * as commonUtils from '~/lib/utils/common_utils';
 import MockAdapter from 'axios-mock-adapter';
 
 describe('common_utils', () => {
@@ -460,17 +459,6 @@ describe('common_utils', () => {
     });
   });
 
-  describe('ajaxPost', () => {
-    it('should perform `$.ajax` call and do `POST` request', () => {
-      const requestURL = '/some/random/api';
-      const data = { keyname: 'value' };
-      const ajaxSpy = spyOn($, 'ajax').and.callFake(() => {});
-
-      commonUtils.ajaxPost(requestURL, data);
-      expect(ajaxSpy.calls.allArgs()[0][0].type).toEqual('POST');
-    });
-  });
-
   describe('spriteIcon', () => {
     let beforeGon;
 

spec/javascripts/merge_request_tabs_spec.js

 /* eslint-disable no-var, comma-dangle, object-shorthand */
-
+import MockAdapter from 'axios-mock-adapter';
+import axios from '~/lib/utils/axios_utils';
 import * as urlUtils from '~/lib/utils/url_utility';
 import MergeRequestTabs from '~/merge_request_tabs';
 import '~/commit/pipelines/pipelines_bundle';
@@ -46,7 +47,7 @@ import 'vendor/jquery.scrollTo';
 
     describe('activateTab', function () {
       beforeEach(function () {
-        spyOn($, 'ajax').and.callFake(function () {});
+        spyOn(axios, 'get').and.returnValue(Promise.resolve({ data: {} }));
         loadFixtures('merge_requests/merge_request_with_task_list.html.raw');
         this.subject = this.class.activateTab;
       });
@@ -148,7 +149,7 @@ import 'vendor/jquery.scrollTo';
 
     describe('setCurrentAction', function () {
       beforeEach(function () {
-        spyOn($, 'ajax').and.callFake(function () {});
+        spyOn(axios, 'get').and.returnValue(Promise.resolve({ data: {} }));
         this.subject = this.class.setCurrentAction;
       });
 
@@ -214,13 +215,21 @@ import 'vendor/jquery.scrollTo';
     });
 
     describe('tabShown', () => {
+      let mock;
+
       beforeEach(function () {
-        spyOn($, 'ajax').and.callFake(function (options) {
-          options.success({ html: '' });
+        mock = new MockAdapter(axios);
+        mock.onGet(/(.*)\/diffs\.json/).reply(200, {
+          data: { html: '' },
         });
+
         loadFixtures('merge_requests/merge_request_with_task_list.html.raw');
       });
 
+      afterEach(() => {
+        mock.restore();
+      });
+
       describe('with "Side-by-side"/parallel diff view', () => {
         beforeEach(function () {
           this.class.diffViewType = () => 'parallel';
@@ -292,16 +301,20 @@ import 'vendor/jquery.scrollTo';
 
       it('triggers Ajax request to JSON endpoint', function (done) {
         const url = '/foo/bar/merge_requests/1/diffs';
-        spyOn(this.class, 'ajaxGet').and.callFake((options) => {
-          expect(options.url).toEqual(`${url}.json`);
+
+        spyOn(axios, 'get').and.callFake((reqUrl) => {
+          expect(reqUrl).toBe(`${url}.json`);
+
           done();
+
+          return Promise.resolve({ data: {} });
         });
 
         this.class.loadDiff(url);
       });
 
       it('triggers scroll event when diff already loaded', function (done) {
-        spyOn(this.class, 'ajaxGet').and.callFake(() => done.fail());
+        spyOn(axios, 'get').and.callFake(done.fail);
         spyOn(document, 'dispatchEvent');
 
         this.class.diffsLoaded = true;
@@ -316,6 +329,7 @@ import 'vendor/jquery.scrollTo';
       describe('with inline diff', () => {
         let noteId;
         let noteLineNumId;
+        let mock;
 
         beforeEach(() => {
           const diffsResponse = getJSONFixture(inlineChangesTabJsonFixture);
@@ -330,29 +344,40 @@ import 'vendor/jquery.scrollTo';
             .attr('href')
             .replace('#', '');
 
-          spyOn($, 'ajax').and.callFake(function (options) {
-            options.success(diffsResponse);
-          });
+          mock = new MockAdapter(axios);
+          mock.onGet(/(.*)\/diffs\.json/).reply(200, diffsResponse);
+        });
+
+        afterEach(() => {
+          mock.restore();
         });
 
         describe('with note fragment hash', () => {
-          it('should expand and scroll to linked fragment hash #note_xxx', function () {
+          it('should expand and scroll to linked fragment hash #note_xxx', function (done) {
             spyOn(urlUtils, 'getLocationHash').and.returnValue(noteId);
             this.class.loadDiff('/foo/bar/merge_requests/1/diffs');
 
-            expect(noteId.length).toBeGreaterThan(0);
-            expect(Notes.instance.toggleDiffNote).toHaveBeenCalledWith({
-              target: jasmine.any(Object),
-              lineType: 'old',
-              forceShow: true,
+            setTimeout(() => {
+              expect(noteId.length).toBeGreaterThan(0);
+              expect(Notes.instance.toggleDiffNote).toHaveBeenCalledWith({
+                target: jasmine.any(Object),
+                lineType: 'old',
+                forceShow: true,
+              });
+
+              done();
             });
           });
 
-          it('should gracefully ignore non-existant fragment hash', function () {
+          it('should gracefully ignore non-existant fragment hash', function (done) {
             spyOn(urlUtils, 'getLocationHash').and.returnValue('note_something-that-does-not-exist');
             this.class.loadDiff('/foo/bar/merge_requests/1/diffs');
 
-            expect(Notes.instance.toggleDiffNote).not.toHaveBeenCalled();
+            setTimeout(() => {
+              expect(Notes.instance.toggleDiffNote).not.toHaveBeenCalled();
+
+              done();
+            });
           });
         });
 
@@ -370,6 +395,7 @@ import 'vendor/jquery.scrollTo';
       describe('with parallel diff', () => {
         let noteId;
         let noteLineNumId;
+        let mock;
 
         beforeEach(() => {
           const diffsResponse = getJSONFixture(parallelChangesTabJsonFixture);
@@ -384,30 +410,40 @@ import 'vendor/jquery.scrollTo';
             .attr('href')
             .replace('#', '');
 
-          spyOn($, 'ajax').and.callFake(function (options) {
-            options.success(diffsResponse);
-          });
+          mock = new MockAdapter(axios);
+          mock.onGet(/(.*)\/diffs\.json/).reply(200, diffsResponse);
+        });
+
+        afterEach(() => {
+          mock.restore();
         });
 
         describe('with note fragment hash', () => {
-          it('should expand and scroll to linked fragment hash #note_xxx', function () {
+          it('should expand and scroll to linked fragment hash #note_xxx', function (done) {
             spyOn(urlUtils, 'getLocationHash').and.returnValue(noteId);
 
             this.class.loadDiff('/foo/bar/merge_requests/1/diffs');
 
-            expect(noteId.length).toBeGreaterThan(0);
-            expect(Notes.instance.toggleDiffNote).toHaveBeenCalledWith({
-              target: jasmine.any(Object),
-              lineType: 'new',
-              forceShow: true,
+            setTimeout(() => {
+              expect(noteId.length).toBeGreaterThan(0);
+              expect(Notes.instance.toggleDiffNote).toHaveBeenCalledWith({
+                target: jasmine.any(Object),
+                lineType: 'new',
+                forceShow: true,
+              });
+
+              done();
             });
           });
 
-          it('should gracefully ignore non-existant fragment hash', function () {
+          it('should gracefully ignore non-existant fragment hash', function (done) {
             spyOn(urlUtils, 'getLocationHash').and.returnValue('note_something-that-does-not-exist');
             this.class.loadDiff('/foo/bar/merge_requests/1/diffs');
 
-            expect(Notes.instance.toggleDiffNote).not.toHaveBeenCalled();
+            setTimeout(() => {
+              expect(Notes.instance.toggleDiffNote).not.toHaveBeenCalled();
+              done();
+            });
           });
         });
 

spec/javascripts/notes_spec.js

 /* eslint-disable space-before-function-paren, no-unused-expressions, no-var, object-shorthand, comma-dangle, max-len */
 import _ from 'underscore';
+import MockAdapter from 'axios-mock-adapter';
+import axios from '~/lib/utils/axios_utils';
 import * as urlUtils from '~/lib/utils/url_utility';
 import 'autosize';
 import '~/gl_form';
 import '~/lib/utils/text_utility';
 import '~/render_gfm';
 import Notes from '~/notes';
+import timeoutPromise from './helpers/set_timeout_promise_helper';
 
 (function() {
   window.gon || (window.gon = {});
@@ -119,6 +122,7 @@ import Notes from '~/notes';
       let noteEntity;
       let $form;
       let $notesContainer;
+      let mock;
 
       beforeEach(() => {
         this.notes = new Notes('', []);
@@ -136,24 +140,32 @@ import Notes from '~/notes';
         $form = $('form.js-main-target-form');
         $notesContainer = $('ul.main-notes-list');
         $form.find('textarea.js-note-text').val(sampleComment);
+
+        mock = new MockAdapter(axios);
+        mock.onPost(/(.*)\/notes$/).reply(200, noteEntity);
       });
 
-      it('updates note and resets edit form', () => {
-        const deferred = $.Deferred();
-        spyOn($, 'ajax').and.returnValue(deferred.promise());
+      afterEach(() => {
+        mock.restore();
+      });
+
+      it('updates note and resets edit form', (done) => {
         spyOn(this.notes, 'revertNoteEditForm');
         spyOn(this.notes, 'setupNewNote');
 
         $('.js-comment-button').click();
-        deferred.resolve(noteEntity);
 
-        const $targetNote = $notesContainer.find(`#note_${noteEntity.id}`);
-        const updatedNote = Object.assign({}, noteEntity);
-        updatedNote.note = 'bar';
-        this.notes.updateNote(updatedNote, $targetNote);
+        setTimeout(() => {
+          const $targetNote = $notesContainer.find(`#note_${noteEntity.id}`);
+          const updatedNote = Object.assign({}, noteEntity);
+          updatedNote.note = 'bar';
+          this.notes.updateNote(updatedNote, $targetNote);
+
+          expect(this.notes.revertNoteEditForm).toHaveBeenCalledWith($targetNote);
+          expect(this.notes.setupNewNote).toHaveBeenCalled();
 
-        expect(this.notes.revertNoteEditForm).toHaveBeenCalledWith($targetNote);
-        expect(this.notes.setupNewNote).toHaveBeenCalled();
+          done();
+        });
       });
     });
 
@@ -479,8 +491,19 @@ import Notes from '~/notes';
       };
       let $form;
       let $notesContainer;
+      let mock;
+
+      function mockNotesPost() {
+        mock.onPost(/(.*)\/notes$/).reply(200, note);
+      }
+
+      function mockNotesPostError() {
+        mock.onPost(/(.*)\/notes$/).networkError();
+      }
 
       beforeEach(() => {
+        mock = new MockAdapter(axios);
+
         this.notes = new Notes('', []);
         window.gon.current_username = 'root';
         window.gon.current_user_fullname = 'Administrator';
@@ -489,63 +512,92 @@ import Notes from '~/notes';
         $form.find('textarea.js-note-text').val(sampleComment);
       });
 
+      afterEach(() => {
+        mock.restore();
+      });
+
       it('should show placeholder note while new comment is being posted', () => {
+        mockNotesPost();
+
         $('.js-comment-button').click();
         expect($notesContainer.find('.note.being-posted').length > 0).toEqual(true);
       });
 
-      it('should remove placeholder note when new comment is done posting', () => {
-        const deferred = $.Deferred();
-        spyOn($, 'ajax').and.returnValue(deferred.promise());
+      it('should remove placeholder note when new comment is done posting', (done) => {
+        mockNotesPost();
+
         $('.js-comment-button').click();
 
-        deferred.resolve(note);
-        expect($notesContainer.find('.note.being-posted').length).toEqual(0);
+        setTimeout(() => {
+          expect($notesContainer.find('.note.being-posted').length).toEqual(0);
+
+          done();
+        });
       });
 
-      it('should show actual note element when new comment is done posting', () => {
-        const deferred = $.Deferred();
-        spyOn($, 'ajax').and.returnValue(deferred.promise());
+      it('should show actual note element when new comment is done posting', (done) => {
+        mockNotesPost();
+
         $('.js-comment-button').click();
 
-        deferred.resolve(note);
-        expect($notesContainer.find(`#note_${note.id}`).length > 0).toEqual(true);
+        setTimeout(() => {
+          expect($notesContainer.find(`#note_${note.id}`).length > 0).toEqual(true);
+
+          done();
+        });
       });
 
-      it('should reset Form when new comment is done posting', () => {
-        const deferred = $.Deferred();
-        spyOn($, 'ajax').and.returnValue(deferred.promise());
+      it('should reset Form when new comment is done posting', (done) => {
+        mockNotesPost();
+
         $('.js-comment-button').click();
 
-        deferred.resolve(note);
-        expect($form.find('textarea.js-note-text').val()).toEqual('');
+        setTimeout(() => {
+          expect($form.find('textarea.js-note-text').val()).toEqual('');
+
+          done();
+        });
       });
 
-      it('should show flash error message when new comment failed to be posted', () => {
-        const deferred = $.Deferred();
-        spyOn($, 'ajax').and.returnValue(deferred.promise());
+      it('should show flash error message when new comment failed to be posted', (done) => {
+        mockNotesPostError();
+
         $('.js-comment-button').click();
 
-        deferred.reject();
-        expect($notesContainer.parent().find('.flash-container .flash-text').is(':visible')).toEqual(true);
+        setTimeout(() => {
+          expect($notesContainer.parent().find('.flash-container .flash-text').is(':visible')).toEqual(true);
+
+          done();
+        });
       });
 
-      it('should show flash error message when comment failed to be updated', () => {
-        const deferred = $.Deferred();
-        spyOn($, 'ajax').and.returnValue(deferred.promise());
+      it('should show flash error message when comment failed to be updated', (done) => {
+        mockNotesPost();
+
         $('.js-comment-button').click();
 
-        deferred.resolve(note);
-        const $noteEl = $notesContainer.find(`#note_${note.id}`);
-        $noteEl.find('.js-note-edit').click();
-        $noteEl.find('textarea.js-note-text').val(updatedComment);
-        $noteEl.find('.js-comment-save-button').click();
+        timeoutPromise()
+          .then(() => {
+            const $noteEl = $notesContainer.find(`#note_${note.id}`);
+            $noteEl.find('.js-note-edit').click();
+            $noteEl.find('textarea.js-note-text').val(updatedComment);
 
-        deferred.reject();
-        const $updatedNoteEl = $notesContainer.find(`#note_${note.id}`);
-        expect($updatedNoteEl.hasClass('.being-posted')).toEqual(false); // Remove being-posted visuals
-        expect($updatedNoteEl.find('.note-text').text().trim()).toEqual(sampleComment); // See if comment reverted back to original
-        expect($('.flash-container').is(':visible')).toEqual(true); // Flash error message shown
+            mock.restore();
+
+            mockNotesPostError();
+
+            $noteEl.find('.js-comment-save-button').click();
+          })
+          .then(timeoutPromise)
+          .then(() => {
+            const $updatedNoteEl = $notesContainer.find(`#note_${note.id}`);
+            expect($updatedNoteEl.hasClass('.being-posted')).toEqual(false); // Remove being-posted visuals
+            expect($updatedNoteEl.find('.note-text').text().trim()).toEqual(sampleComment); // See if comment reverted back to original
+            expect($('.flash-container').is(':visible')).toEqual(true); // Flash error message shown
+
+            done();
+          })
+          .catch(done.fail);
       });
     });
 
@@ -563,8 +615,12 @@ import Notes from '~/notes';
       };
       let $form;
       let $notesContainer;
+      let mock;
 
       beforeEach(() => {
+        mock = new MockAdapter(axios);
+        mock.onPost(/(.*)\/notes$/).reply(200, note);
+
         this.notes = new Notes('', []);
         window.gon.current_username = 'root';
         window.gon.current_user_fullname = 'Administrator';
@@ -582,15 +638,20 @@ import Notes from '~/notes';
         $form.find('textarea.js-note-text').val(sampleComment);
       });
 
-      it('should remove slash command placeholder when comment with slash commands is done posting', () => {
-        const deferred = $.Deferred();
-        spyOn($, 'ajax').and.returnValue(deferred.promise());
+      afterEach(() => {
+        mock.restore();
+      });
+
+      it('should remove slash command placeholder when comment with slash commands is done posting', (done) => {
         spyOn(gl.awardsHandler, 'addAwardToEmojiBar').and.callThrough();
         $('.js-comment-button').click();
 
         expect($notesContainer.find('.system-note.being-posted').length).toEqual(1); // Placeholder shown
-        deferred.resolve(note);
-        expect($notesContainer.find('.system-note.being-posted').length).toEqual(0); // Placeholder removed
+
+        setTimeout(() => {
+          expect($notesContainer.find('.system-note.being-posted').length).toEqual(0); // Placeholder removed
+          done();
+        });
       });
     });
 
@@ -607,8 +668,12 @@ import Notes from '~/notes';
       };
       let $form;
       let $notesContainer;
+      let mock;
 
       beforeEach(() => {
+        mock = new MockAdapter(axios);
+        mock.onPost(/(.*)\/notes$/).reply(200, note);
+
         this.notes = new Notes('', []);
         window.gon.current_username = 'root';
         window.gon.current_user_fullname = 'Administrator';
@@ -617,19 +682,24 @@ import Notes from '~/notes';
         $form.find('textarea.js-note-text').html(sampleComment);
       });
 
-      it('should not render a script tag', () => {
-        const deferred = $.Deferred();
-        spyOn($, 'ajax').and.returnValue(deferred.promise());
+      afterEach(() => {
+        mock.restore();
+      });
+
+      it('should not render a script tag', (done) => {
         $('.js-comment-button').click();
 
-        deferred.resolve(note);
-        const $noteEl = $notesContainer.find(`#note_${note.id}`);
-        $noteEl.find('.js-note-edit').click();
-        $noteEl.find('textarea.js-note-text').html(updatedComment);
-        $noteEl.find('.js-comment-save-button').click();
+        setTimeout(() => {
+          const $noteEl = $notesContainer.find(`#note_${note.id}`);
+          $noteEl.find('.js-note-edit').click();
+          $noteEl.find('textarea.js-note-text').html(updatedComment);
+          $noteEl.find('.js-comment-save-button').click();
+
+          const $updatedNoteEl = $notesContainer.find(`#note_${note.id}`).find('.js-task-list-container');
+          expect($updatedNoteEl.find('.note-text').text().trim()).toEqual('');
 
-        const $updatedNoteEl = $notesContainer.find(`#note_${note.id}`).find('.js-task-list-container');
-        expect($updatedNoteEl.find('.note-text').text().trim()).toEqual('');
+          done();
+        });
       });
     });