diff --git a/plugins/techdocs-node/__mocks__/aws-sdk.ts b/plugins/techdocs-node/__mocks__/aws-sdk.ts
deleted file mode 100644
index ebb3c6840b..0000000000
--- a/plugins/techdocs-node/__mocks__/aws-sdk.ts
+++ /dev/null
@@ -1,114 +0,0 @@
-/*
- * Copyright 2020 The Backstage Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import { EventEmitter } from 'events';
-import { ReadStream } from 'fs';
-import { IStorageFilesMock } from '../src/testUtils/types';
-
-export { Credentials } from 'aws-sdk';
-
-const storage = global.storageFilesMock as IStorageFilesMock;
-
-export class S3 {
-  constructor() {
-    storage.emptyFiles();
-  }
-
-  headObject({ Key }: { Key: string }) {
-    return {
-      promise: async () => {
-        if (!storage.fileExists(Key)) {
-          throw new Error('File does not exist');
-        }
-      },
-    };
-  }
-
-  getObject({ Key }: { Key: string }) {
-    return {
-      promise: async () => storage.fileExists(Key),
-      createReadStream: () => {
-        const emitter = new EventEmitter();
-        process.nextTick(() => {
-          if (storage.fileExists(Key)) {
-            emitter.emit('data', Buffer.from(storage.readFile(Key)));
-            emitter.emit('end');
-          } else {
-            emitter.emit('error', new Error(`The file ${Key} does not exist!`));
-          }
-        });
-        return emitter;
-      },
-    };
-  }
-
-  headBucket({ Bucket }) {
-    return {
-      promise: async () => {
-        if (Bucket === 'errorBucket') {
-          throw new Error('Bucket does not exist');
-        }
-        return {};
-      },
-    };
-  }
-
-  upload({ Key, Body }: { Key: string; Body: ReadStream }) {
-    return {
-      promise: () =>
-        new Promise(async resolve => {
-          const chunks = [];
-          Body.on('data', chunk => {
-            chunks.push(chunk);
-          });
-          Body.once('end', () => {
-            storage.writeFile(Key, Buffer.concat(chunks));
-            resolve(null);
-          });
-        }),
-    };
-  }
-
-  listObjectsV2({ Bucket }) {
-    return {
-      promise: () => {
-        if (
-          Bucket === 'delete_stale_files_success' ||
-          Bucket === 'delete_stale_files_error'
-        ) {
-          return Promise.resolve({
-            Contents: [{ Key: 'stale_file.png' }],
-          });
-        }
-        return Promise.resolve({});
-      },
-    };
-  }
-
-  deleteObject({ Bucket }) {
-    return {
-      promise: () => {
-        if (Bucket === 'delete_stale_files_error') {
-          throw new Error('Message');
-        }
-        return Promise.resolve();
-      },
-    };
-  }
-}
-
-export default {
-  S3,
-};
diff --git a/plugins/techdocs-node/src/stages/publish/awsS3.test.ts b/plugins/techdocs-node/src/stages/publish/awsS3.test.ts
index 537fc52b27..6372093c4b 100644
--- a/plugins/techdocs-node/src/stages/publish/awsS3.test.ts
+++ b/plugins/techdocs-node/src/stages/publish/awsS3.test.ts
@@ -21,12 +21,112 @@ import express from 'express';
 import request from 'supertest';
 import mockFs from 'mock-fs';
 import path from 'path';
-import fs from 'fs-extra';
+import fs, { ReadStream } from 'fs-extra';
+import { EventEmitter } from 'events';
 import { AwsS3Publish } from './awsS3';
+import { storageRootDir } from '../../testUtils/StorageFilesMock';
 
-// NOTE: /plugins/techdocs-node/__mocks__ is being used to mock aws-sdk client library
+jest.mock('aws-sdk', () => {
+  const { StorageFilesMock } = require('../../testUtils/StorageFilesMock');
+  const storage = new StorageFilesMock();
 
-const rootDir = (global as any).rootDir; // Set by setupTests.ts
+  return {
+    __esModule: true,
+    Credentials: jest.requireActual('aws-sdk').Credentials,
+    default: {
+      S3: class {
+        constructor() {
+          storage.emptyFiles();
+        }
+
+        headObject({ Key }: { Key: string }) {
+          return {
+            promise: async () => {
+              if (!storage.fileExists(Key)) {
+                throw new Error('File does not exist');
+              }
+            },
+          };
+        }
+
+        getObject({ Key }: { Key: string }) {
+          return {
+            promise: async () => storage.fileExists(Key),
+            createReadStream: () => {
+              const emitter = new EventEmitter();
+              process.nextTick(() => {
+                if (storage.fileExists(Key)) {
+                  emitter.emit('data', Buffer.from(storage.readFile(Key)));
+                  emitter.emit('end');
+                } else {
+                  emitter.emit(
+                    'error',
+                    new Error(`The file ${Key} does not exist!`),
+                  );
+                }
+              });
+              return emitter;
+            },
+          };
+        }
+
+        headBucket({ Bucket }: { Bucket: string }) {
+          return {
+            promise: async () => {
+              if (Bucket === 'errorBucket') {
+                throw new Error('Bucket does not exist');
+              }
+              return {};
+            },
+          };
+        }
+
+        upload({ Key, Body }: { Key: string; Body: ReadStream }) {
+          return {
+            promise: () =>
+              new Promise(async resolve => {
+                const chunks = new Array<Buffer>();
+                Body.on('data', chunk => {
+                  chunks.push(chunk as Buffer);
+                });
+                Body.once('end', () => {
+                  storage.writeFile(Key, Buffer.concat(chunks));
+                  resolve(null);
+                });
+              }),
+          };
+        }
+
+        listObjectsV2({ Bucket }: { Bucket: string }) {
+          return {
+            promise: () => {
+              if (
+                Bucket === 'delete_stale_files_success' ||
+                Bucket === 'delete_stale_files_error'
+              ) {
+                return Promise.resolve({
+                  Contents: [{ Key: 'stale_file.png' }],
+                });
+              }
+              return Promise.resolve({});
+            },
+          };
+        }
+
+        deleteObject({ Bucket }: { Bucket: string }) {
+          return {
+            promise: () => {
+              if (Bucket === 'delete_stale_files_error') {
+                throw new Error('Message');
+              }
+              return Promise.resolve();
+            },
+          };
+        }
+      },
+    },
+  };
+});
 
 const getEntityRootDir = (entity: Entity) => {
   const {
@@ -34,7 +134,7 @@ const getEntityRootDir = (entity: Entity) => {
     metadata: { namespace, name },
   } = entity;
 
-  return path.join(rootDir, namespace || DEFAULT_NAMESPACE, kind, name);
+  return path.join(storageRootDir, namespace || DEFAULT_NAMESPACE, kind, name);
 };
 
 const logger = getVoidLogger();
@@ -213,7 +313,7 @@ describe('AwsS3Publish', () => {
 
     it('should fail to publish a directory', async () => {
       const wrongPathToGeneratedDirectory = path.join(
-        rootDir,
+        storageRootDir,
         'wrong',
         'path',
         'to',
diff --git a/plugins/techdocs-node/src/testUtils/StorageFilesMock.ts b/plugins/techdocs-node/src/testUtils/StorageFilesMock.ts
index 4a0e183bdb..dd28110d00 100644
--- a/plugins/techdocs-node/src/testUtils/StorageFilesMock.ts
+++ b/plugins/techdocs-node/src/testUtils/StorageFilesMock.ts
@@ -19,12 +19,13 @@ import path from 'path';
 import fs from 'fs-extra';
 import { IStorageFilesMock } from './types';
 
-const rootDir: string = os.platform() === 'win32' ? 'C:\\rootDir' : '/rootDir';
+export const storageRootDir: string =
+  os.platform() === 'win32' ? 'C:\\rootDir' : '/rootDir';
 
 const encoding = 'utf8';
 
 export class StorageFilesMock implements IStorageFilesMock {
-  static rootDir = rootDir;
+  static rootDir = storageRootDir;
 
   private files: Record<string, string>;
 
@@ -37,20 +38,20 @@ export class StorageFilesMock implements IStorageFilesMock {
   }
 
   public fileExists(targetPath: string): boolean {
-    const filePath = path.join(rootDir, targetPath);
+    const filePath = path.join(storageRootDir, targetPath);
     const posixPath = filePath.split(path.posix.sep).join(path.sep);
     return this.files[posixPath] !== undefined;
   }
 
   public readFile(targetPath: string): Buffer {
-    const filePath = path.join(rootDir, targetPath);
+    const filePath = path.join(storageRootDir, targetPath);
     return Buffer.from(this.files[filePath] ?? '', encoding);
   }
 
   public writeFile(targetPath: string, sourcePath: string): void;
   public writeFile(targetPath: string, sourceBuffer: Buffer): void;
   public writeFile(targetPath: string, source: string | Buffer): void {
-    const filePath = path.join(rootDir, targetPath);
+    const filePath = path.join(storageRootDir, targetPath);
     if (typeof source === 'string') {
       this.files[filePath] = fs.readFileSync(source).toString(encoding);
     } else {