diff --git a/apps/backend/src/app/modules/filestore/file-store-s3.service.spec.ts b/apps/backend/src/app/modules/filestore/file-store-s3.service.spec.ts
new file mode 100644
index 000000000..7b026dde9
--- /dev/null
+++ b/apps/backend/src/app/modules/filestore/file-store-s3.service.spec.ts
@@ -0,0 +1,138 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { FileStoreS3Service } from './file-store-s3.service';
+import { ConfigService } from '@nestjs/config';
+import { createHash } from 'node:crypto';
+
+describe('FileStoreS3Service', () => {
+  let service: FileStoreS3Service;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [FileStoreS3Service, ConfigService]
+    }).compile();
+
+    service = module.get<FileStoreS3Service>(FileStoreS3Service);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+
+  it('storeFile should store a file', async () => {
+    const fileBuffer = Buffer.from('elephants');
+    const fileKey = 'testKey';
+
+    jest
+      .spyOn(service['s3Client'], 'send')
+      .mockImplementation(() => Promise.resolve());
+
+    const result = await service.storeFile(fileBuffer, fileKey);
+
+    expect(result.fileKey).toEqual(fileKey);
+    expect(result.hash).toEqual(
+      createHash('sha1').update(fileBuffer).digest('hex')
+    );
+  });
+
+  it('copyFile should copy a file', async () => {
+    const fromKey = 'fromKey';
+    const toKey = 'toKey';
+
+    jest
+      .spyOn(service['s3Client'], 'send')
+      .mockImplementation(() => Promise.resolve());
+
+    const result = await service.copyFile(fromKey, toKey);
+
+    expect(result).toEqual(true);
+  });
+
+  it('copyFile should return false if the file is missing', async () => {
+    const fromKey = 'fromKey';
+    const toKey = 'toKey';
+
+    jest
+      .spyOn(service['s3Client'], 'send')
+      .mockImplementation(() => Promise.reject({ Code: 'NoSuchKey' }));
+
+    const result = await service.copyFile(fromKey, toKey);
+
+    expect(result).toEqual(false);
+  });
+
+  it('deleteFile should delete a file', async () => {
+    const fileKey = 'fileKey';
+
+    jest
+      .spyOn(service['s3Client'], 'send')
+      .mockImplementation(() => Promise.resolve());
+
+    const result = await service.deleteFile(fileKey);
+
+    expect(result).toEqual(true);
+  });
+
+  it('deleteFile should return false if the file is missing', async () => {
+    const fileKey = 'fileKey';
+
+    jest
+      .spyOn(service['s3Client'], 'send')
+      .mockImplementation(() => Promise.reject({ Code: 'NoSuchKey' }));
+
+    const result = await service.deleteFile(fileKey);
+
+    expect(result).toEqual(false);
+  });
+
+  it('deleteFiles should delete multiple files', async () => {
+    const fileKeys = ['fileKey1', 'fileKey2'];
+
+    jest
+      .spyOn(service['s3Client'], 'send')
+      .mockImplementation(() => Promise.resolve());
+
+    const result = await service.deleteFiles(fileKeys);
+
+    expect(result).toEqual(true);
+  });
+
+  it('deleteFiles should return false if any file is missing', async () => {
+    const fileKeys = ['fileKey1', 'fileKey2'];
+
+    jest
+      .spyOn(service['s3Client'], 'send')
+      .mockImplementation(() => Promise.reject({ Code: 'NoSuchKey' }));
+
+    const result = await service.deleteFiles(fileKeys);
+
+    expect(result).toEqual(false);
+  });
+
+  it('getFile should get a file', async () => {
+    const fileKey = 'fileKey';
+
+    jest.spyOn(service['s3Client'], 'send').mockImplementation(() =>
+      Promise.resolve({
+        Body: {
+          transformToByteArray: () => new Uint8Array()
+        }
+      })
+    );
+
+    const result = await service.getFile(fileKey);
+
+    expect(result).toBeInstanceOf(Uint8Array);
+  });
+
+  it('getFile should return null if the file is missing', async () => {
+    const fileKey = 'fileKey';
+
+    jest
+      .spyOn(service['s3Client'], 'send')
+      .mockImplementation(() => Promise.reject({ Code: 'NoSuchKey' }));
+
+    const result = await service.getFile(fileKey);
+
+    expect(result).toBeNull();
+  });
+});