Migrated actions_spec for jest

Moved /create_cluster/gke_cluster/stores/getters_spec.js file
and /create_cluster/gke_cluster/helpers.js file
to migrate tests from karma to jest.

spec/frontend/create_cluster/gke_cluster/helpers.js

+import {
+  gapiProjectsResponseMock,
+  gapiZonesResponseMock,
+  gapiMachineTypesResponseMock,
+} from './mock_data';
+
+const cloudbilling = {
+  projects: {
+    getBillingInfo: jest.fn(
+      () =>
+        new Promise(resolve => {
+          resolve({
+            result: { billingEnabled: true },
+          });
+        }),
+    ),
+  },
+};
+
+const cloudresourcemanager = {
+  projects: {
+    list: jest.fn(
+      () =>
+        new Promise(resolve => {
+          resolve({
+            result: { ...gapiProjectsResponseMock },
+          });
+        }),
+    ),
+  },
+};
+
+const compute = {
+  zones: {
+    list: jest.fn(
+      () =>
+        new Promise(resolve => {
+          resolve({
+            result: { ...gapiZonesResponseMock },
+          });
+        }),
+    ),
+  },
+  machineTypes: {
+    list: jest.fn(
+      () =>
+        new Promise(resolve => {
+          resolve({
+            result: { ...gapiMachineTypesResponseMock },
+          });
+        }),
+    ),
+  },
+};
+
+const gapi = {
+  client: {
+    cloudbilling,
+    cloudresourcemanager,
+    compute,
+  },
+};
+
+export { gapi as default };

spec/javascripts/create_cluster/gke_cluster/stores/actions_spec.js → spec/frontend/create_cluster/gke_cluster/stores/actions_spec.js

-import testAction from 'spec/helpers/vuex_action_helper';
+import testAction from 'helpers/vuex_action_helper';
 import * as actions from '~/create_cluster/gke_cluster/store/actions';
 import { createStore } from '~/create_cluster/gke_cluster/store';
-import { gapi } from '../helpers';
+import gapi from '../helpers';
 import { selectedProjectMock, selectedZoneMock, selectedMachineTypeMock } from '../mock_data';
 
 describe('GCP Cluster Dropdown Store Actions', () => {
@@ -65,9 +65,10 @@ describe('GCP Cluster Dropdown Store Actions', () => {
 
   describe('async fetch methods', () => {
     let originalGapi;
+
     beforeAll(() => {
       originalGapi = window.gapi;
-      window.gapi = gapi();
+      window.gapi = gapi;
     });
 
     afterAll(() => {

spec/javascripts/create_cluster/gke_cluster/helpers.js

-import {
-  gapiProjectsResponseMock,
-  gapiZonesResponseMock,
-  gapiMachineTypesResponseMock,
-} from './mock_data';
-
-// eslint-disable-next-line import/prefer-default-export
-export const gapi = () => ({
-  client: {
-    cloudbilling: {
-      projects: {
-        getBillingInfo: () =>
-          new Promise(resolve => {
-            resolve({
-              result: { billingEnabled: true },
-            });
-          }),
-      },
-    },
-    cloudresourcemanager: {
-      projects: {
-        list: () =>
-          new Promise(resolve => {
-            resolve({
-              result: { ...gapiProjectsResponseMock },
-            });
-          }),
-      },
-    },
-    compute: {
-      zones: {
-        list: () =>
-          new Promise(resolve => {
-            resolve({
-              result: { ...gapiZonesResponseMock },
-            });
-          }),
-      },
-      machineTypes: {
-        list: () =>
-          new Promise(resolve => {
-            resolve({
-              result: { ...gapiMachineTypesResponseMock },
-            });
-          }),
-      },
-    },
-  },
-});