diff --git a/plugins/techdocs-node/__mocks__/@google-cloud/storage.ts b/plugins/techdocs-node/__mocks__/@google-cloud/storage.ts
deleted file mode 100644
index e87ccb69c1..0000000000
--- a/plugins/techdocs-node/__mocks__/@google-cloud/storage.ts
+++ /dev/null
@@ -1,119 +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 { Readable } from 'stream';
-import { IStorageFilesMock } from '../../src/testUtils/types';
-
-const storage = global.storageFilesMock as IStorageFilesMock;
-
-class GCSFile {
-  private readonly path: string;
-
-  constructor(path: string) {
-    this.path = path;
-  }
-
-  exists() {
-    return new Promise(async (resolve, reject) => {
-      if (storage.fileExists(this.path)) {
-        resolve([true]);
-      } else {
-        reject();
-      }
-    });
-  }
-
-  createReadStream() {
-    const readable = new Readable();
-    readable._read = () => {};
-
-    process.nextTick(() => {
-      if (storage.fileExists(this.path)) {
-        if (readable.eventNames().includes('pipe')) {
-          readable.emit('pipe');
-        }
-        readable.emit('data', storage.readFile(this.path));
-        readable.emit('end');
-      } else {
-        readable.emit(
-          'error',
-          new Error(`The file ${this.path} does not exist!`),
-        );
-      }
-    });
-
-    return readable;
-  }
-
-  delete() {
-    return Promise.resolve();
-  }
-}
-
-class Bucket {
-  private readonly bucketName;
-
-  constructor(bucketName: string) {
-    this.bucketName = bucketName;
-  }
-
-  async getMetadata() {
-    if (this.bucketName === 'bad_bucket_name') {
-      throw Error('Bucket does not exist');
-    }
-    return '';
-  }
-
-  upload(source: string, { destination }) {
-    return new Promise(async resolve => {
-      storage.writeFile(destination, source);
-      resolve(null);
-    });
-  }
-
-  file(destinationFilePath: string) {
-    if (this.bucketName === 'delete_stale_files_error') {
-      throw Error('Message');
-    }
-    return new GCSFile(destinationFilePath);
-  }
-
-  getFilesStream() {
-    const readable = new Readable();
-    readable._read = () => {};
-
-    process.nextTick(() => {
-      if (
-        this.bucketName === 'delete_stale_files_success' ||
-        this.bucketName === 'delete_stale_files_error'
-      ) {
-        readable.emit('data', { name: 'stale-file.png' });
-      }
-      readable.emit('end');
-    });
-
-    return readable;
-  }
-}
-
-export class Storage {
-  constructor() {
-    storage.emptyFiles();
-  }
-
-  bucket(bucketName) {
-    return new Bucket(bucketName);
-  }
-}
diff --git a/plugins/techdocs-node/src/stages/publish/googleStorage.test.ts b/plugins/techdocs-node/src/stages/publish/googleStorage.test.ts
index 6471d89a06..b347f185c6 100644
--- a/plugins/techdocs-node/src/stages/publish/googleStorage.test.ts
+++ b/plugins/techdocs-node/src/stages/publish/googleStorage.test.ts
@@ -22,11 +22,119 @@ import request from 'supertest';
 import mockFs from 'mock-fs';
 import path from 'path';
 import fs from 'fs-extra';
+import { Readable } from 'stream';
 import { GoogleGCSPublish } from './googleStorage';
+import {
+  storageRootDir,
+  StorageFilesMock,
+} from '../../testUtils/StorageFilesMock';
 
-// NOTE: /plugins/techdocs-node/__mocks__ is being used to mock Google Cloud Storage client library
+jest.mock('@google-cloud/storage', () => {
+  class GCSFile {
+    constructor(
+      private readonly filePath: string,
+      private readonly storage: StorageFilesMock,
+    ) {}
 
-const rootDir = (global as any).rootDir; // Set by setupTests.ts
+    exists() {
+      return new Promise(async (resolve, reject) => {
+        if (this.storage.fileExists(this.filePath)) {
+          resolve([true]);
+        } else {
+          reject();
+        }
+      });
+    }
+
+    createReadStream() {
+      const readable = new Readable();
+      readable._read = () => {};
+
+      process.nextTick(() => {
+        if (this.storage.fileExists(this.filePath)) {
+          if (readable.eventNames().includes('pipe')) {
+            readable.emit('pipe');
+          }
+          readable.emit('data', this.storage.readFile(this.filePath));
+          readable.emit('end');
+        } else {
+          readable.emit(
+            'error',
+            new Error(`The file ${this.filePath} does not exist!`),
+          );
+        }
+      });
+
+      return readable;
+    }
+
+    delete() {
+      return Promise.resolve();
+    }
+  }
+
+  class Bucket {
+    constructor(
+      private readonly bucketName: string,
+      private readonly storage: StorageFilesMock,
+    ) {}
+
+    async getMetadata() {
+      if (this.bucketName === 'bad_bucket_name') {
+        throw Error('Bucket does not exist');
+      }
+      return '';
+    }
+
+    upload(source: string, { destination }: { destination: string }) {
+      return new Promise(async resolve => {
+        this.storage.writeFile(destination, source);
+        resolve(null);
+      });
+    }
+
+    file(destinationFilePath: string) {
+      if (this.bucketName === 'delete_stale_files_error') {
+        throw Error('Message');
+      }
+      return new GCSFile(destinationFilePath, this.storage);
+    }
+
+    getFilesStream() {
+      const readable = new Readable();
+      readable._read = () => {};
+
+      process.nextTick(() => {
+        if (
+          this.bucketName === 'delete_stale_files_success' ||
+          this.bucketName === 'delete_stale_files_error'
+        ) {
+          readable.emit('data', { name: 'stale-file.png' });
+        }
+        readable.emit('end');
+      });
+
+      return readable;
+    }
+  }
+
+  class Storage {
+    storage = new StorageFilesMock();
+
+    constructor() {
+      this.storage.emptyFiles();
+    }
+
+    bucket(bucketName: string) {
+      return new Bucket(bucketName, this.storage);
+    }
+  }
+
+  return {
+    __esModule: true,
+    Storage,
+  };
+});
 
 const getEntityRootDir = (entity: Entity) => {
   const {
@@ -34,7 +142,7 @@ 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();
@@ -193,7 +301,7 @@ describe('GoogleGCSPublish', () => {
 
     it('should fail to publish a directory', async () => {
       const wrongPathToGeneratedDirectory = path.join(
-        rootDir,
+        storageRootDir,
         'wrong',
         'path',
         'to',