message: propagate testID to FlatList for Picker.ios
diff: @@ -210,6 +210,7 @@ class PickerNB extends Component {
  <Container style={this.props.modalStyle}>
  {this.renderHeader()}
  <FlatList
  + testID={this.props.testID}
  data={this.state.dataSource}
  keyExtractor={(item, index) => String(index)}
  renderItem={({ item }) => (
  