Start with highest quality compression and find a suitable size (#33)

__tests__/lib/images.test.ts

@@ -0,0 +1,97 @@
+import {downloadAndResize, DownloadAndResizeOpts} from '../../src/lib/images'
+import ImageResizer from '@bam.tech/react-native-image-resizer'
+import RNFetchBlob from 'rn-fetch-blob'
+
+jest.mock('rn-fetch-blob', () => ({
+  config: jest.fn().mockReturnThis(),
+  cancel: jest.fn(),
+  fetch: jest.fn(),
+}))
+jest.mock('@bam.tech/react-native-image-resizer', () => ({
+  createResizedImage: jest.fn(),
+}))
+
+describe('downloadAndResize', () => {
+  const errorSpy = jest.spyOn(global.console, 'error')
+
+  const mockResizedImage = {
+    path: jest.fn().mockReturnValue('file://resized-image.jpg'),
+    size: 100,
+  }
+
+  beforeEach(() => {
+    jest.clearAllMocks()
+
+    const mockedCreateResizedImage =
+      ImageResizer.createResizedImage as jest.Mock
+    mockedCreateResizedImage.mockResolvedValue(mockResizedImage)
+  })
+
+  it('should return resized image for valid URI and options', async () => {
+    const mockedFetch = RNFetchBlob.fetch as jest.Mock
+    mockedFetch.mockResolvedValueOnce({
+      path: jest.fn().mockReturnValue('file://downloaded-image.jpg'),
+      flush: jest.fn(),
+    })
+
+    const opts: DownloadAndResizeOpts = {
+      uri: 'https://example.com/image.jpg',
+      width: 100,
+      height: 100,
+      maxSize: 500000,
+      mode: 'cover',
+      timeout: 10000,
+    }
+
+    const result = await downloadAndResize(opts)
+    expect(result).toEqual(mockResizedImage)
+    expect(RNFetchBlob.config).toHaveBeenCalledWith({
+      fileCache: true,
+      appendExt: 'jpeg',
+    })
+    expect(RNFetchBlob.fetch).toHaveBeenCalledWith(
+      'GET',
+      'https://example.com/image.jpg',
+    )
+    expect(ImageResizer.createResizedImage).toHaveBeenCalledWith(
+      'file://downloaded-image.jpg',
+      100,
+      100,
+      'JPEG',
+      1,
+      undefined,
+      undefined,
+      undefined,
+      {mode: 'cover'},
+    )
+  })
+
+  it('should return undefined for invalid URI', async () => {
+    const opts: DownloadAndResizeOpts = {
+      uri: 'invalid-uri',
+      width: 100,
+      height: 100,
+      maxSize: 500000,
+      mode: 'cover',
+      timeout: 10000,
+    }
+
+    const result = await downloadAndResize(opts)
+    expect(errorSpy).toHaveBeenCalled()
+    expect(result).toBeUndefined()
+  })
+
+  it('should return undefined for unsupported file type', async () => {
+    const opts: DownloadAndResizeOpts = {
+      uri: 'https://example.com/image.bmp',
+      width: 100,
+      height: 100,
+      maxSize: 500000,
+      mode: 'cover',
+      timeout: 10000,
+    }
+
+    const result = await downloadAndResize(opts)
+    expect(result).toBeUndefined()
+  })
+})