(test) assert input's checked status after a DOM 'change' event

test/generator/samples/binding-input-radio-group/_config.js

@@ -54,6 +54,10 @@ export default {
 			<p>Alpha</p>
 		` );
 
+		assert.equal( inputs[0].checked, true );
+		assert.equal( inputs[1].checked, false );
+		assert.equal( inputs[2].checked, false );
+
 		component.set({ selected: values[2] });
 		assert.equal( inputs[0].checked, false );
 		assert.equal( inputs[1].checked, false );