[fix] TextInput props

- Add missing 'onSubmitEditing' propType and test
- Add 'dir=auto' DOM attribute to allow browser to switch writing
  direction for RTL languages

src/components/TextInput/__tests__/index-test.js

@@ -169,8 +169,6 @@ describe('components/TextInput', () => {
     }
   });
 
-  test('prop "onLayout"');
-
   test('prop "onSelectionChange"', (done) => {
     const input = findNativeInput(mount(<TextInput defaultValue='12345' onSelectionChange={onSelectionChange} />));
     input.simulate('select', { target: { selectionStart: 0, selectionEnd: 3 } });
@@ -181,6 +179,16 @@ describe('components/TextInput', () => {
     }
   });
 
+  describe('prop "onSubmitEditing"', () => {
+    test('single-line input', (done) => {
+      const input = findNativeInput(mount(<TextInput defaultValue='12345' onSubmitEditing={onSubmitEditing} />));
+      input.simulate('keyPress', { which: 13 });
+      function onSubmitEditing(e) {
+        done();
+      }
+    });
+  });
+
   test('prop "secureTextEntry"', () => {
     let input = findNativeInput(shallow(<TextInput secureTextEntry />));
     expect(input.prop('type')).toEqual('password');

src/components/TextInput/index.js

@@ -72,6 +72,7 @@ class TextInput extends Component {
     onFocus: PropTypes.func,
     onKeyPress: PropTypes.func,
     onSelectionChange: PropTypes.func,
+    onSubmitEditing: PropTypes.func,
     placeholder: PropTypes.string,
     placeholderTextColor: PropTypes.string,
     secureTextEntry: PropTypes.bool,
@@ -188,6 +189,7 @@ class TextInput extends Component {
     const props = {
       ...other,
       autoCorrect: autoCorrect ? 'on' : 'off',
+      dir: 'auto',
       onBlur: normalizeEventHandler(this._handleBlur),
       onChange: normalizeEventHandler(this._handleChange),
       onFocus: normalizeEventHandler(this._handleFocus),