diff --git a/app/assets/javascripts/api.js b/app/assets/javascripts/api.js
index e5f36c84987..6680834a8d1 100644
--- a/app/assets/javascripts/api.js
+++ b/app/assets/javascripts/api.js
@@ -1,148 +1,175 @@
-/* eslint-disable func-names, space-before-function-paren, quotes, object-shorthand, camelcase, no-var, comma-dangle, prefer-arrow-callback, quote-props, no-param-reassign, max-len */
+import $ from 'jquery';
 
-var Api = {
-  groupsPath: "/api/:version/groups.json",
-  groupPath: "/api/:version/groups/:id.json",
-  namespacesPath: "/api/:version/namespaces.json",
-  groupProjectsPath: "/api/:version/groups/:id/projects.json",
-  projectsPath: "/api/:version/projects.json?simple=true",
-  labelsPath: "/:namespace_path/:project_path/labels",
-  licensePath: "/api/:version/templates/licenses/:key",
-  gitignorePath: "/api/:version/templates/gitignores/:key",
-  gitlabCiYmlPath: "/api/:version/templates/gitlab_ci_ymls/:key",
-  dockerfilePath: "/api/:version/templates/dockerfiles/:key",
-  issuableTemplatePath: "/:namespace_path/:project_path/templates/:type/:key",
-  group: function(group_id, callback) {
-    var url = Api.buildUrl(Api.groupPath)
-      .replace(':id', group_id);
+const Api = {
+  groupsPath: '/api/:version/groups.json',
+  groupPath: '/api/:version/groups/:id.json',
+  namespacesPath: '/api/:version/namespaces.json',
+  groupProjectsPath: '/api/:version/groups/:id/projects.json',
+  projectsPath: '/api/:version/projects.json?simple=true',
+  labelsPath: '/:namespace_path/:project_path/labels',
+  licensePath: '/api/:version/templates/licenses/:key',
+  gitignorePath: '/api/:version/templates/gitignores/:key',
+  gitlabCiYmlPath: '/api/:version/templates/gitlab_ci_ymls/:key',
+  dockerfilePath: '/api/:version/templates/dockerfiles/:key',
+  issuableTemplatePath: '/:namespace_path/:project_path/templates/:type/:key',
+  usersPath: '/api/:version/users.json',
+
+  group(groupId, callback) {
+    const url = Api.buildUrl(Api.groupPath)
+      .replace(':id', groupId);
     return $.ajax({
-      url: url,
-      dataType: "json"
-    }).done(function(group) {
-      return callback(group);
-    });
+      url,
+      dataType: 'json',
+    })
+      .done(group => callback(group));
   },
+
   // Return groups list. Filtered by query
-  groups: function(query, options, callback) {
-    var url = Api.buildUrl(Api.groupsPath);
+  groups(query, options, callback) {
+    const url = Api.buildUrl(Api.groupsPath);
     return $.ajax({
-      url: url,
-      data: $.extend({
-        search: query,
-        per_page: 20
-      }, options),
-      dataType: "json"
-    }).done(function(groups) {
-      return callback(groups);
-    });
-  },
-  // Return namespaces list. Filtered by query
-  namespaces: function(query, callback) {
-    var url = Api.buildUrl(Api.namespacesPath);
-    return $.ajax({
-      url: url,
-      data: {
-        search: query,
-        per_page: 20
-      },
-      dataType: "json"
-    }).done(function(namespaces) {
-      return callback(namespaces);
-    });
-  },
-  // Return projects list. Filtered by query
-  projects: function(query, options, callback) {
-    var url = Api.buildUrl(Api.projectsPath);
-    return $.ajax({
-      url: url,
-      data: $.extend({
+      url,
+      data: Object.assign({
         search: query,
         per_page: 20,
-        membership: true
       }, options),
-      dataType: "json"
-    }).done(function(projects) {
-      return callback(projects);
-    });
+      dataType: 'json',
+    })
+      .done(groups => callback(groups));
   },
-  newLabel: function(namespace_path, project_path, data, callback) {
-    var url = Api.buildUrl(Api.labelsPath)
-      .replace(':namespace_path', namespace_path)
-      .replace(':project_path', project_path);
+
+  // Return namespaces list. Filtered by query
+  namespaces(query, callback) {
+    const url = Api.buildUrl(Api.namespacesPath);
     return $.ajax({
-      url: url,
-      type: "POST",
-      data: { 'label': data },
-      dataType: "json"
-    }).done(function(label) {
-      return callback(label);
-    }).error(function(message) {
-      return callback(message.responseJSON);
-    });
-  },
-  // Return group projects list. Filtered by query
-  groupProjects: function(group_id, query, callback) {
-    var url = Api.buildUrl(Api.groupProjectsPath)
-      .replace(':id', group_id);
-    return $.ajax({
-      url: url,
+      url,
       data: {
         search: query,
-        per_page: 20
+        per_page: 20,
       },
-      dataType: "json"
-    }).done(function(projects) {
-      return callback(projects);
-    });
+      dataType: 'json',
+    }).done(namespaces => callback(namespaces));
   },
+
+  // Return projects list. Filtered by query
+  projects(query, options, callback) {
+    const url = Api.buildUrl(Api.projectsPath);
+    return $.ajax({
+      url,
+      data: Object.assign({
+        search: query,
+        per_page: 20,
+        membership: true,
+      }, options),
+      dataType: 'json',
+    })
+      .done(projects => callback(projects));
+  },
+
+  newLabel(namespacePath, projectPath, data, callback) {
+    const url = Api.buildUrl(Api.labelsPath)
+      .replace(':namespace_path', namespacePath)
+      .replace(':project_path', projectPath);
+    return $.ajax({
+      url,
+      type: 'POST',
+      data: { label: data },
+      dataType: 'json',
+    })
+      .done(label => callback(label))
+      .error(message => callback(message.responseJSON));
+  },
+
+  // Return group projects list. Filtered by query
+  groupProjects(groupId, query, callback) {
+    const url = Api.buildUrl(Api.groupProjectsPath)
+      .replace(':id', groupId);
+    return $.ajax({
+      url,
+      data: {
+        search: query,
+        per_page: 20,
+      },
+      dataType: 'json',
+    })
+      .done(projects => callback(projects));
+  },
+
   // Return text for a specific license
-  licenseText: function(key, data, callback) {
-    var url = Api.buildUrl(Api.licensePath)
+  licenseText(key, data, callback) {
+    const url = Api.buildUrl(Api.licensePath)
       .replace(':key', key);
     return $.ajax({
-      url: url,
-      data: data
-    }).done(function(license) {
-      return callback(license);
-    });
+      url,
+      data,
+    })
+      .done(license => callback(license));
   },
-  gitignoreText: function(key, callback) {
-    var url = Api.buildUrl(Api.gitignorePath)
+
+  gitignoreText(key, callback) {
+    const url = Api.buildUrl(Api.gitignorePath)
       .replace(':key', key);
-    return $.get(url, function(gitignore) {
-      return callback(gitignore);
-    });
+    return $.get(url, gitignore => callback(gitignore));
   },
-  gitlabCiYml: function(key, callback) {
-    var url = Api.buildUrl(Api.gitlabCiYmlPath)
+
+  gitlabCiYml(key, callback) {
+    const url = Api.buildUrl(Api.gitlabCiYmlPath)
       .replace(':key', key);
-    return $.get(url, function(file) {
-      return callback(file);
-    });
+    return $.get(url, file => callback(file));
   },
-  dockerfileYml: function(key, callback) {
-    var url = Api.buildUrl(Api.dockerfilePath).replace(':key', key);
+
+  dockerfileYml(key, callback) {
+    const url = Api.buildUrl(Api.dockerfilePath).replace(':key', key);
     $.get(url, callback);
   },
-  issueTemplate: function(namespacePath, projectPath, key, type, callback) {
-    var url = Api.buildUrl(Api.issuableTemplatePath)
+
+  issueTemplate(namespacePath, projectPath, key, type, callback) {
+    const url = Api.buildUrl(Api.issuableTemplatePath)
       .replace(':key', key)
       .replace(':type', type)
       .replace(':project_path', projectPath)
       .replace(':namespace_path', namespacePath);
     $.ajax({
-      url: url,
-      dataType: 'json'
-    }).done(function(file) {
-      callback(null, file);
-    }).error(callback);
+      url,
+      dataType: 'json',
+    })
+      .done(file => callback(null, file))
+      .error(callback);
   },
-  buildUrl: function(url) {
+
+  users(query, options) {
+    const url = Api.buildUrl(this.usersPath);
+    return Api.wrapAjaxCall({
+      url,
+      data: Object.assign({
+        search: query,
+        per_page: 20,
+      }, options),
+      dataType: 'json',
+    });
+  },
+
+  buildUrl(url) {
+    let urlRoot = '';
     if (gon.relative_url_root != null) {
-      url = gon.relative_url_root + url;
+      urlRoot = gon.relative_url_root;
     }
-    return url.replace(':version', gon.api_version);
-  }
+    return urlRoot + url.replace(':version', gon.api_version);
+  },
+
+  wrapAjaxCall(options) {
+    return new Promise((resolve, reject) => {
+      // jQuery 2 is not Promises/A+ compatible (missing catch)
+      $.ajax(options) // eslint-disable-line promise/catch-or-return
+      .then(data => resolve(data),
+        (jqXHR, textStatus, errorThrown) => {
+          const error = new Error(`${options.url}: ${errorThrown}`);
+          error.textStatus = textStatus;
+          reject(error);
+        },
+      );
+    });
+  },
 };
 
-window.Api = Api;
+export default Api;
diff --git a/app/assets/javascripts/blob/file_template_selector.js b/app/assets/javascripts/blob/file_template_selector.js
index ab5b3751c4e..5ae30990aea 100644
--- a/app/assets/javascripts/blob/file_template_selector.js
+++ b/app/assets/javascripts/blob/file_template_selector.js
@@ -1,5 +1,3 @@
-/* global Api */
-
 export default class FileTemplateSelector {
   constructor(mediator) {
     this.mediator = mediator;
@@ -65,4 +63,3 @@ export default class FileTemplateSelector {
     this.reportSelection(opts);
   }
 }
-
diff --git a/app/assets/javascripts/blob/template_selectors/ci_yaml_selector.js b/app/assets/javascripts/blob/template_selectors/ci_yaml_selector.js
index f2f81af137b..9c41e429c8d 100644
--- a/app/assets/javascripts/blob/template_selectors/ci_yaml_selector.js
+++ b/app/assets/javascripts/blob/template_selectors/ci_yaml_selector.js
@@ -1,4 +1,4 @@
-/* global Api */
+import Api from '../../api';
 
 import FileTemplateSelector from '../file_template_selector';
 
diff --git a/app/assets/javascripts/blob/template_selectors/dockerfile_selector.js b/app/assets/javascripts/blob/template_selectors/dockerfile_selector.js
index 3cb7b960aaa..45fb614fe00 100644
--- a/app/assets/javascripts/blob/template_selectors/dockerfile_selector.js
+++ b/app/assets/javascripts/blob/template_selectors/dockerfile_selector.js
@@ -1,4 +1,4 @@
-/* global Api */
+import Api from '../../api';
 
 import FileTemplateSelector from '../file_template_selector';
 
diff --git a/app/assets/javascripts/blob/template_selectors/gitignore_selector.js b/app/assets/javascripts/blob/template_selectors/gitignore_selector.js
index 7efda8e7f50..a894953cc86 100644
--- a/app/assets/javascripts/blob/template_selectors/gitignore_selector.js
+++ b/app/assets/javascripts/blob/template_selectors/gitignore_selector.js
@@ -1,4 +1,4 @@
-/* global Api */
+import Api from '../../api';
 
 import FileTemplateSelector from '../file_template_selector';
 
diff --git a/app/assets/javascripts/blob/template_selectors/license_selector.js b/app/assets/javascripts/blob/template_selectors/license_selector.js
index 1d757332f6c..b7c4da0f62e 100644
--- a/app/assets/javascripts/blob/template_selectors/license_selector.js
+++ b/app/assets/javascripts/blob/template_selectors/license_selector.js
@@ -1,4 +1,4 @@
-/* global Api */
+import Api from '../../api';
 
 import FileTemplateSelector from '../file_template_selector';
 
diff --git a/app/assets/javascripts/create_label.js b/app/assets/javascripts/create_label.js
index 121d64db789..907b468e576 100644
--- a/app/assets/javascripts/create_label.js
+++ b/app/assets/javascripts/create_label.js
@@ -1,5 +1,5 @@
 /* eslint-disable func-names, space-before-function-paren, prefer-arrow-callback, comma-dangle, prefer-template, quotes, no-param-reassign, wrap-iife, max-len */
-/* global Api */
+import Api from './api';
 
 class CreateLabelDropdown {
   constructor ($el, namespacePath, projectPath) {
diff --git a/app/assets/javascripts/groups_select.js b/app/assets/javascripts/groups_select.js
index acfa4bd4c6b..b5975295329 100644
--- a/app/assets/javascripts/groups_select.js
+++ b/app/assets/javascripts/groups_select.js
@@ -3,7 +3,7 @@
                   prefer-arrow-callback, comma-dangle, consistent-return, yoda,
                   prefer-rest-params, prefer-spread, no-unused-vars, prefer-template,
                   promise/catch-or-return */
-/* global Api */
+import Api from './api';
 
 var slice = [].slice;
 
diff --git a/app/assets/javascripts/namespace_select.js b/app/assets/javascripts/namespace_select.js
index 426d7f3288e..5da2db063a4 100644
--- a/app/assets/javascripts/namespace_select.js
+++ b/app/assets/javascripts/namespace_select.js
@@ -1,5 +1,5 @@
 /* eslint-disable func-names, space-before-function-paren, no-var, prefer-rest-params, wrap-iife, one-var, vars-on-top, one-var-declaration-per-line, comma-dangle, object-shorthand, no-else-return, prefer-template, quotes, prefer-arrow-callback, no-param-reassign, no-cond-assign, max-len */
-/* global Api */
+import Api from './api';
 
 (function() {
   window.NamespaceSelect = (function() {
diff --git a/app/assets/javascripts/project_select.js b/app/assets/javascripts/project_select.js
index 3c1c1e7dceb..0ff0a3b6cc4 100644
--- a/app/assets/javascripts/project_select.js
+++ b/app/assets/javascripts/project_select.js
@@ -1,5 +1,5 @@
 /* eslint-disable func-names, space-before-function-paren, wrap-iife, prefer-arrow-callback, no-var, comma-dangle, object-shorthand, one-var, one-var-declaration-per-line, no-else-return, quotes, max-len */
-/* global Api */
+import Api from './api';
 
 (function() {
   this.ProjectSelect = (function() {
diff --git a/app/assets/javascripts/search.js b/app/assets/javascripts/search.js
index 39e4006ac4e..05caf177aec 100644
--- a/app/assets/javascripts/search.js
+++ b/app/assets/javascripts/search.js
@@ -1,6 +1,6 @@
 /* eslint-disable func-names, space-before-function-paren, wrap-iife, no-var, one-var, one-var-declaration-per-line, object-shorthand, prefer-arrow-callback, comma-dangle, prefer-template, quotes, no-else-return, max-len */
 /* global Flash */
-/* global Api */
+import Api from './api';
 
 (function() {
   this.Search = (function() {
diff --git a/app/assets/javascripts/templates/issuable_template_selector.js b/app/assets/javascripts/templates/issuable_template_selector.js
index e62f429f1ae..9dd14488f22 100644
--- a/app/assets/javascripts/templates/issuable_template_selector.js
+++ b/app/assets/javascripts/templates/issuable_template_selector.js
@@ -1,5 +1,5 @@
 /* eslint-disable comma-dangle, max-len, no-useless-return, no-param-reassign, max-len */
-/* global Api */
+import Api from '../api';
 
 import TemplateSelector from '../blob/template_selector';
 
diff --git a/spec/javascripts/api_spec.js b/spec/javascripts/api_spec.js
new file mode 100644
index 00000000000..867322ce8ae
--- /dev/null
+++ b/spec/javascripts/api_spec.js
@@ -0,0 +1,281 @@
+import Api from '~/api';
+
+describe('Api', () => {
+  const dummyApiVersion = 'v3000';
+  const dummyUrlRoot = 'http://host.invalid';
+  const dummyGon = {
+    api_version: dummyApiVersion,
+    relative_url_root: dummyUrlRoot,
+  };
+  const dummyResponse = 'hello from outer space!';
+  const sendDummyResponse = () => {
+    const deferred = $.Deferred();
+    deferred.resolve(dummyResponse);
+    return deferred.promise();
+  };
+  let originalGon;
+
+  beforeEach(() => {
+    originalGon = window.gon;
+    window.gon = dummyGon;
+  });
+
+  afterEach(() => {
+    window.gon = originalGon;
+  });
+
+  describe('buildUrl', () => {
+    it('adds URL root and fills in API version', () => {
+      const input = '/api/:version/foo/bar';
+      const expectedOutput = `${dummyUrlRoot}/api/${dummyApiVersion}/foo/bar`;
+
+      const builtUrl = Api.buildUrl(input);
+
+      expect(builtUrl).toEqual(expectedOutput);
+    });
+  });
+
+  describe('group', () => {
+    it('fetches a group', (done) => {
+      const groupId = '123456';
+      const expectedUrl = `${dummyUrlRoot}/api/${dummyApiVersion}/groups/${groupId}.json`;
+      spyOn(jQuery, 'ajax').and.callFake((request) => {
+        expect(request.url).toEqual(expectedUrl);
+        expect(request.dataType).toEqual('json');
+        return sendDummyResponse();
+      });
+
+      Api.group(groupId, (response) => {
+        expect(response).toBe(dummyResponse);
+        done();
+      });
+    });
+  });
+
+  describe('groups', () => {
+    it('fetches groups', (done) => {
+      const query = 'dummy query';
+      const options = { unused: 'option' };
+      const expectedUrl = `${dummyUrlRoot}/api/${dummyApiVersion}/groups.json`;
+      const expectedData = Object.assign({
+        search: query,
+        per_page: 20,
+      }, options);
+      spyOn(jQuery, 'ajax').and.callFake((request) => {
+        expect(request.url).toEqual(expectedUrl);
+        expect(request.dataType).toEqual('json');
+        expect(request.data).toEqual(expectedData);
+        return sendDummyResponse();
+      });
+
+      Api.groups(query, options, (response) => {
+        expect(response).toBe(dummyResponse);
+        done();
+      });
+    });
+  });
+
+  describe('namespaces', () => {
+    it('fetches namespaces', (done) => {
+      const query = 'dummy query';
+      const expectedUrl = `${dummyUrlRoot}/api/${dummyApiVersion}/namespaces.json`;
+      const expectedData = {
+        search: query,
+        per_page: 20,
+      };
+      spyOn(jQuery, 'ajax').and.callFake((request) => {
+        expect(request.url).toEqual(expectedUrl);
+        expect(request.dataType).toEqual('json');
+        expect(request.data).toEqual(expectedData);
+        return sendDummyResponse();
+      });
+
+      Api.namespaces(query, (response) => {
+        expect(response).toBe(dummyResponse);
+        done();
+      });
+    });
+  });
+
+  describe('projects', () => {
+    it('fetches projects', (done) => {
+      const query = 'dummy query';
+      const options = { unused: 'option' };
+      const expectedUrl = `${dummyUrlRoot}/api/${dummyApiVersion}/projects.json?simple=true`;
+      const expectedData = Object.assign({
+        search: query,
+        per_page: 20,
+        membership: true,
+      }, options);
+      spyOn(jQuery, 'ajax').and.callFake((request) => {
+        expect(request.url).toEqual(expectedUrl);
+        expect(request.dataType).toEqual('json');
+        expect(request.data).toEqual(expectedData);
+        return sendDummyResponse();
+      });
+
+      Api.projects(query, options, (response) => {
+        expect(response).toBe(dummyResponse);
+        done();
+      });
+    });
+  });
+
+  describe('newLabel', () => {
+    it('creates a new label', (done) => {
+      const namespace = 'some namespace';
+      const project = 'some project';
+      const labelData = { some: 'data' };
+      const expectedUrl = `${dummyUrlRoot}/${namespace}/${project}/labels`;
+      const expectedData = {
+        label: labelData,
+      };
+      spyOn(jQuery, 'ajax').and.callFake((request) => {
+        expect(request.url).toEqual(expectedUrl);
+        expect(request.dataType).toEqual('json');
+        expect(request.type).toEqual('POST');
+        expect(request.data).toEqual(expectedData);
+        return sendDummyResponse();
+      });
+
+      Api.newLabel(namespace, project, labelData, (response) => {
+        expect(response).toBe(dummyResponse);
+        done();
+      });
+    });
+  });
+
+  describe('groupProjects', () => {
+    it('fetches group projects', (done) => {
+      const groupId = '123456';
+      const query = 'dummy query';
+      const expectedUrl = `${dummyUrlRoot}/api/${dummyApiVersion}/groups/${groupId}/projects.json`;
+      const expectedData = {
+        search: query,
+        per_page: 20,
+      };
+      spyOn(jQuery, 'ajax').and.callFake((request) => {
+        expect(request.url).toEqual(expectedUrl);
+        expect(request.dataType).toEqual('json');
+        expect(request.data).toEqual(expectedData);
+        return sendDummyResponse();
+      });
+
+      Api.groupProjects(groupId, query, (response) => {
+        expect(response).toBe(dummyResponse);
+        done();
+      });
+    });
+  });
+
+  describe('licenseText', () => {
+    it('fetches a license text', (done) => {
+      const licenseKey = "driver's license";
+      const data = { unused: 'option' };
+      const expectedUrl = `${dummyUrlRoot}/api/${dummyApiVersion}/templates/licenses/${licenseKey}`;
+      spyOn(jQuery, 'ajax').and.callFake((request) => {
+        expect(request.url).toEqual(expectedUrl);
+        expect(request.data).toEqual(data);
+        return sendDummyResponse();
+      });
+
+      Api.licenseText(licenseKey, data, (response) => {
+        expect(response).toBe(dummyResponse);
+        done();
+      });
+    });
+  });
+
+  describe('gitignoreText', () => {
+    it('fetches a gitignore text', (done) => {
+      const gitignoreKey = 'ignore git';
+      const expectedUrl = `${dummyUrlRoot}/api/${dummyApiVersion}/templates/gitignores/${gitignoreKey}`;
+      spyOn(jQuery, 'get').and.callFake((url, callback) => {
+        expect(url).toEqual(expectedUrl);
+        callback(dummyResponse);
+      });
+
+      Api.gitignoreText(gitignoreKey, (response) => {
+        expect(response).toBe(dummyResponse);
+        done();
+      });
+    });
+  });
+
+  describe('gitlabCiYml', () => {
+    it('fetches a .gitlab-ci.yml', (done) => {
+      const gitlabCiYmlKey = 'Y CI ML';
+      const expectedUrl = `${dummyUrlRoot}/api/${dummyApiVersion}/templates/gitlab_ci_ymls/${gitlabCiYmlKey}`;
+      spyOn(jQuery, 'get').and.callFake((url, callback) => {
+        expect(url).toEqual(expectedUrl);
+        callback(dummyResponse);
+      });
+
+      Api.gitlabCiYml(gitlabCiYmlKey, (response) => {
+        expect(response).toBe(dummyResponse);
+        done();
+      });
+    });
+  });
+
+  describe('dockerfileYml', () => {
+    it('fetches a Dockerfile', (done) => {
+      const dockerfileYmlKey = 'a giant whale';
+      const expectedUrl = `${dummyUrlRoot}/api/${dummyApiVersion}/templates/dockerfiles/${dockerfileYmlKey}`;
+      spyOn(jQuery, 'get').and.callFake((url, callback) => {
+        expect(url).toEqual(expectedUrl);
+        callback(dummyResponse);
+      });
+
+      Api.dockerfileYml(dockerfileYmlKey, (response) => {
+        expect(response).toBe(dummyResponse);
+        done();
+      });
+    });
+  });
+
+  describe('issueTemplate', () => {
+    it('fetches an issue template', (done) => {
+      const namespace = 'some namespace';
+      const project = 'some project';
+      const templateKey = 'template key';
+      const templateType = 'template type';
+      const expectedUrl = `${dummyUrlRoot}/${namespace}/${project}/templates/${templateType}/${templateKey}`;
+      spyOn(jQuery, 'ajax').and.callFake((request) => {
+        expect(request.url).toEqual(expectedUrl);
+        return sendDummyResponse();
+      });
+
+      Api.issueTemplate(namespace, project, templateKey, templateType, (error, response) => {
+        expect(error).toBe(null);
+        expect(response).toBe(dummyResponse);
+        done();
+      });
+    });
+  });
+
+  describe('users', () => {
+    it('fetches users', (done) => {
+      const query = 'dummy query';
+      const options = { unused: 'option' };
+      const expectedUrl = `${dummyUrlRoot}/api/${dummyApiVersion}/users.json`;
+      const expectedData = Object.assign({
+        search: query,
+        per_page: 20,
+      }, options);
+      spyOn(jQuery, 'ajax').and.callFake((request) => {
+        expect(request.url).toEqual(expectedUrl);
+        expect(request.dataType).toEqual('json');
+        expect(request.data).toEqual(expectedData);
+        return sendDummyResponse();
+      });
+
+      Api.users(query, options)
+        .then((response) => {
+          expect(response).toBe(dummyResponse);
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+  });
+});