[change] modernize Picker

Rewrite Picker to use function components and hooks.
Rewrite the tests to replace enzyme with testing-library.

packages/react-native-web/src/exports/Picker/PickerItem.js

@@ -10,7 +10,6 @@
 
 import type { ColorValue } from '../../types';
 
-import React from 'react';
 import createElement from '../createElement';
 
 type Props = {
@@ -20,10 +19,8 @@ type Props = {
   value?: number | string
 };
 
-export default class PickerItem extends React.Component<Props> {
-  render() {
-    const { color, label, testID, value } = this.props;
-    const style = { color };
-    return createElement('option', { style, testID, value }, label);
-  }
+export default function PickerItem(props: Props) {
+  const { color, label, testID, value } = props;
+  const style = { color };
+  return createElement('option', { style, testID, value }, label);
 }

packages/react-native-web/src/exports/Picker/__tests__/__snapshots__/index-test.js.snap

@@ -9,14 +9,9 @@ exports[`components/Picker prop "children" items 1`] = `
 `;
 
 exports[`components/Picker prop "children" renders items 1`] = `
-Array [
-  <PickerItem
-    label="label-1"
-    value="value-1"
-  />,
-  <PickerItem
-    label="label-2"
-    value="value-2"
-  />,
-]
+<option
+  value="value-1"
+>
+  label-1
+</option>
 `;

packages/react-native-web/src/exports/Picker/__tests__/index-test.js

@@ -1,9 +1,13 @@
 /* eslint-env jasmine, jest */
 
 import React from 'react';
-import { shallow } from 'enzyme';
+import { render } from '@testing-library/react';
 import Picker from '..';
 
+function findSelect(container) {
+  return container.querySelector('select');
+}
+
 describe('components/Picker', () => {
   describe('prop "children"', () => {
     test('renders items', () => {
@@ -13,14 +17,14 @@ describe('components/Picker', () => {
           <Picker.Item label="label-2" value="value-2" />
         </Picker>
       );
-      const component = shallow(picker);
-      expect(component.children()).toMatchSnapshot();
+      const { container } = render(picker);
+      expect(container.firstChild.firstChild).toMatchSnapshot();
     });
 
     test('items', () => {
       const pickerItem = <Picker.Item label="label-1" value="value-1" />;
-      const component = shallow(pickerItem);
-      expect(component).toMatchSnapshot();
+      const { container } = render(pickerItem);
+      expect(container.firstChild).toMatchSnapshot();
     });
   });
 
@@ -32,8 +36,8 @@ describe('components/Picker', () => {
           <Picker.Item label="label-2" value="value-2" />
         </Picker>
       );
-      const component = shallow(picker);
-      expect(component.find('select').prop('disabled')).toBe(true);
+      const { container } = render(picker);
+      expect(findSelect(container).disabled).toBe(true);
     });
   });
 
@@ -46,11 +50,14 @@ describe('components/Picker', () => {
           <Picker.Item label="label-2" value="value-2" />
         </Picker>
       );
-      const component = shallow(picker);
-      component.find('select').simulate('change', {
-        target: { selectedIndex: '1', value: 'value-2' }
-      });
-      expect(onValueChange).toHaveBeenCalledWith('value-2', '1');
+      const { container } = render(picker);
+      const select = findSelect(container);
+      // mock change event
+      select.selectedIndex = '1';
+      select.value = 'value-2';
+      select.dispatchEvent(new window.Event('change', { bubbles: true }));
+
+      expect(onValueChange).toHaveBeenCalledWith('value-2', 1);
     });
   });
 
@@ -62,8 +69,8 @@ describe('components/Picker', () => {
           <Picker.Item label="label-2" value="value-2" />
         </Picker>
       );
-      const component = shallow(picker);
-      expect(component.find('select').prop('value')).toBe('value-2');
+      const { container } = render(picker);
+      expect(findSelect(container).value).toBe('value-2');
     });
 
     test('selects the correct item (number)', () => {
@@ -73,8 +80,8 @@ describe('components/Picker', () => {
           <Picker.Item label="label-2" value={22} />
         </Picker>
       );
-      const component = shallow(picker);
-      expect(component.find('select').prop('value')).toBe(22);
+      const { container } = render(picker);
+      expect(findSelect(container).value).toBe('22');
     });
   });
 });

packages/react-native-web/src/exports/Picker/index.js

@@ -10,11 +10,12 @@
 
 import type { ViewProps } from '../View';
 
-import applyNativeMethods from '../../modules/applyNativeMethods';
-import { Component } from 'react';
 import createElement from '../createElement';
+import setAndForwardRef from '../../modules/setAndForwardRef';
+import usePlatformMethods from '../../hooks/usePlatformMethods';
 import PickerItem from './PickerItem';
 import StyleSheet, { type StyleObj } from '../StyleSheet';
+import { forwardRef, useRef } from 'react';
 
 type PickerProps = {
   ...ViewProps,
@@ -29,44 +30,51 @@ type PickerProps = {
   prompt?: string
 };
 
-class Picker extends Component<PickerProps> {
-  static Item = PickerItem;
+const Picker = forwardRef<PickerProps, *>((props, ref) => {
+  const {
+    children,
+    enabled,
+    onValueChange,
+    selectedValue,
+    style,
+    testID,
+    /* eslint-disable */
+    itemStyle,
+    mode,
+    prompt,
+    /* eslint-enable */
+    ...other
+  } = props;
 
-  render() {
-    const {
-      children,
-      enabled,
-      selectedValue,
-      style,
-      testID,
-      /* eslint-disable */
-      itemStyle,
-      mode,
-      prompt,
-      onValueChange,
-      /* eslint-enable */
-      ...otherProps
-    } = this.props;
+  const hostRef = useRef(null);
+  const setRef = setAndForwardRef({
+    getForwardedRef: () => ref,
+    setLocalRef: c => {
+      hostRef.current = c;
+    }
+  });
+  usePlatformMethods(hostRef, ref, null, style);
 
-    return createElement('select', {
-      children,
-      disabled: enabled === false ? true : undefined,
-      onChange: this._handleChange,
-      style: [styles.initial, style],
-      testID,
-      value: selectedValue,
-      ...otherProps
-    });
-  }
-
-  _handleChange = (e: Object) => {
-    const { onValueChange } = this.props;
+  function handleChange(e: Object) {
     const { selectedIndex, value } = e.target;
     if (onValueChange) {
       onValueChange(value, selectedIndex);
     }
-  };
-}
+  }
+
+  return createElement('select', {
+    children,
+    disabled: enabled === false ? true : undefined,
+    onChange: handleChange,
+    ref: setRef,
+    style: [styles.initial, style],
+    testID,
+    value: selectedValue,
+    ...other
+  });
+});
+
+Picker.Item = PickerItem;
 
 const styles = StyleSheet.create({
   initial: {
@@ -76,4 +84,4 @@ const styles = StyleSheet.create({
   }
 });
 
-export default applyNativeMethods(Picker);
+export default Picker;