test(cli): add test for get-userpoolgroup-list.ts (aws-amplify#7227)

This commit adds a test for get-userpoolgroup-list.ts

packages/amplify-cli/src/__tests__/extensions/amplify-helpers/get-userpoolgroup-list.test.ts

@@ -0,0 +1,43 @@
+import { getUserPoolGroupList } from '../../../extensions/amplify-helpers/get-userpoolgroup-list';
+
+jest.mock('amplify-cli-core', () => ({
+  pathManager: {
+    getBackendDirPath: jest.fn().mockImplementation(() => ''),
+  },
+  JSONUtilities: {
+    readJson: jest.fn().mockImplementation(() => [
+      {
+        groupName: 'Admins',
+        precedence: 1,
+        customPolicies: [
+          {
+            PolicyName: 'admin-group-policy',
+            PolicyDocument: {
+              Version: '2012-10-17',
+              Statement: [
+                {
+                  Sid: 'statement1',
+                  Effect: 'Allow',
+                  Action: ['s3:CreateBucket'],
+                  Resource: ['arn:aws:s3:::*'],
+                },
+              ],
+            },
+          },
+        ],
+      },
+      {
+        groupName: 'Editors',
+        precedence: 2,
+      },
+    ]),
+  },
+}));
+
+describe('getUserPoolGroupList', () => {
+  const mock_context = {};
+  it('should return array of groupNames', () => {
+    const userPoolGroupList = getUserPoolGroupList(mock_context);
+    expect(userPoolGroupList).toStrictEqual(['Admins', 'Editors']);
+  });
+});