feat: add files server package

packages/files/src/Domain/UseCase/StreamDownloadFile/StreamDownloadFile.spec.ts

@@ -0,0 +1,48 @@
+import 'reflect-metadata'
+
+import { Readable } from 'stream'
+import { Logger } from 'winston'
+import { FileDownloaderInterface } from '../../Services/FileDownloaderInterface'
+
+import { StreamDownloadFile } from './StreamDownloadFile'
+
+describe('StreamDownloadFile', () => {
+  let fileDownloader: FileDownloaderInterface
+  let logger: Logger
+
+  const createUseCase = () => new StreamDownloadFile(fileDownloader, logger)
+
+  beforeEach(() => {
+    fileDownloader = {} as jest.Mocked<FileDownloaderInterface>
+    fileDownloader.createDownloadStream = jest.fn().mockReturnValue(new Readable())
+
+    logger = {} as jest.Mocked<Logger>
+    logger.error = jest.fn()
+  })
+
+  it('should stream download file contents from S3', async () => {
+    const result = await createUseCase().execute({
+      userUuid: '2-3-4',
+      resourceRemoteIdentifier: '1-2-3',
+      startRange: 0,
+      endRange: 200,
+    })
+
+    expect(result.success).toBeTruthy()
+  })
+
+  it('should not stream download file contents from S3 if it fails', async () => {
+    fileDownloader.createDownloadStream = jest.fn().mockImplementation(() => {
+      throw new Error('oops')
+    })
+
+    const result = await createUseCase().execute({
+      userUuid: '2-3-4',
+      resourceRemoteIdentifier: '1-2-3',
+      startRange: 0,
+      endRange: 200,
+    })
+
+    expect(result.success).toBeFalsy()
+  })
+})