added value check

should not trigger change event for the value equal to the previous one,
facebook/react#9893

component/Radio.js

@@ -59,9 +59,11 @@ class Radio extends Component {
 
   _onChange = (e, {value}) => {
     const {name} = this.props;
+    const isSameValue = this.state.value === value;
 
-    if (!this._controlled) this.setState({value});
-    this.props.onChange(e, {name, value});
+    // workaround for https://github.com/facebook/react/issues/9893
+    if (!isSameValue && !this._controlled) this.setState({value});
+    if (!isSameValue) this.props.onChange(e, {name, value});
   }
 
   computeOptions(options) {

test/component/Radio.unit.test.js

@@ -168,6 +168,24 @@ describe('onChange', () => {
       value: 'bb',
     });
   });
+
+  it('should not call the handler for the same value twice', () => {
+    const onChange = jest.fn();
+    const component = shallow(
+      <Radio
+        name='control'
+        onChange={onChange}
+        options={[
+          {label: 'AA', value: 'aa'},
+          {label: 'BB', value: 'bb'},
+          {label: 'CC', value: 'cc'},
+        ]}/>
+    );
+
+    component.instance()._onChange(null, {value: 'bb'});
+    component.instance()._onChange(null, {value: 'bb'});
+    expect(onChange).toHaveBeenCalledTimes(1);
+  });
 });
 
 describe('onFocus', () => {