migrate file system api

jest/jestSetup.js

@@ -29,12 +29,57 @@ jest.mock('react-native-safe-area-context', () => {
   }
 })
 
-jest.mock('expo-file-system/legacy', () => ({
-  getInfoAsync: jest.fn().mockResolvedValue({exists: true, size: 100}),
-  deleteAsync: jest.fn(),
-  moveAsync: jest.fn().mockResolvedValue(undefined),
-  createDownloadResumable: jest.fn(),
-}))
+jest.mock('expo-file-system', () => {
+  const join = parts =>
+    parts
+      .map(part => (typeof part === 'string' ? part : part.uri))
+      .join('/')
+      .replace(/([^:]\/)\/+/g, '$1')
+
+  class File {
+    static downloadFileAsync = jest.fn()
+
+    constructor(...parts) {
+      this.uri = join(parts)
+      this.exists = true
+      this.size = 100
+      this.type = 'image/jpeg'
+    }
+
+    copy = jest.fn()
+    delete = jest.fn()
+    move = jest.fn(async destination => {
+      this.uri = destination.uri
+    })
+    write = jest.fn()
+  }
+
+  class Directory {
+    static pickDirectoryAsync = jest.fn()
+
+    constructor(...parts) {
+      this.uri = join(parts)
+      this.exists = true
+    }
+
+    create = jest.fn()
+    createFile = jest.fn(name => new File(this, name))
+    delete = jest.fn()
+    list = jest.fn(() => [])
+  }
+
+  return {
+    Directory,
+    EncodingType: {Base64: 'base64'},
+    File,
+    Paths: {
+      availableDiskSpace: 100,
+      cache: new Directory('file://cache'),
+      document: new Directory('file://document'),
+      info: jest.fn(() => ({exists: true, isDirectory: false})),
+    },
+  }
+})
 
 jest.mock('expo-image-manipulator', () => {
   const createContext = () => {