fix: Serialize defaultSelected as selected attr

Author: rschristian

src/index.js

@@ -15,7 +15,8 @@ const SHALLOW = { shallow: true };
 // components without names, kept as a hash for later comparison to return consistent UnnamedComponentXX names.
 const UNNAMED = [];
 
-const VOID_ELEMENTS = /^(area|base|br|col|embed|hr|img|input|link|meta|param|source|track|wbr)$/;
+const VOID_ELEMENTS =
+	/^(area|base|br|col|embed|hr|img|input|link|meta|param|source|track|wbr)$/;
 
 const UNSAFE_NAME = /[\s\n\\/='"\0<>]/;
 
@@ -265,6 +266,8 @@ function _renderToString(vnode, context, opts, inner, isSvgMode, selectValue) {
 				name = 'value';
 			} else if (name === 'defaultChecked') {
 				name = 'checked';
+			} else if (name === 'defaultSelected') {
+				name = 'selected';
 			} else if (name === 'className') {
 				if (typeof props.class !== 'undefined') continue;
 				name = 'class';

test/render.test.js

@@ -102,6 +102,13 @@ describe('render', () => {
 			expect(rendered).to.equal(expected);
 		});
 
+		it('should serialize defaultSelected prop to the selected attribute', () => {
+			let rendered = render(<option defaultSelected />),
+				expected = `<option selected></option>`;
+
+			expect(rendered).to.equal(expected);
+		});
+
 		it('should include boolean aria-* attributes', () => {
 			let rendered = render(<div aria-hidden aria-whatever={false} />),
 				expected = `<div aria-hidden="true" aria-whatever="false"></div>`;