fix: jest mock

Author: lodev09

package.json

@@ -169,6 +169,7 @@
     "semi": false
   },
   "react-native-builder-bob": {
+    "exclude": "**/{__tests__,__fixtures__}/**",
     "source": "src",
     "output": "lib",
     "targets": [

src/__mocks__/index.js

@@ -2,6 +2,7 @@ import React from 'react'
 import { View } from 'react-native'
 
 export * from '../TrueSheetGrabber'
+export * from '../TrueSheetFooter'
 
 export class TrueSheet extends React.Component {
   static dismiss = jest.fn()