Migrate Component.getInitialState() here from preact core (as of prea…

…ct 6.2.0)

src/index.js

@@ -465,6 +465,7 @@ function afterRender() {
 
 function Component(props, context, opts) {
 	PreactComponent.call(this, props, context);
+	if (this.getInitialState) this.state = this.getInitialState();
 	this.refs = {};
 	this._refProxies = {};
 	if (opts!==BYPASS_HOOK) {

test/component.js

@@ -83,6 +83,26 @@ describe('components', () => {
 		});
 	});
 
+	describe('getInitialState', () => {
+		it('should be invoked for new components', () => {
+			class Foo extends React.Component {
+				getInitialState() {
+					return { foo: 'bar' };
+				}
+				render() {
+					return <div />;
+				}
+			}
+
+			sinon.spy(Foo.prototype, 'getInitialState');
+
+			let a = React.render(<Foo />, scratch);
+
+			expect(Foo.prototype.getInitialState).to.have.been.calledOnce;
+			expect(a.state).to.eql({ foo: 'bar' });
+		});
+	});
+
 	describe('defaultProps', () => {
 		it('should support defaultProps for components', () => {
 			let render = sinon.stub().returns(<div />);

test/jsx.js

@@ -14,6 +14,6 @@ describe('jsx', () => {
 
 		let html = renderToString(jsx);
 
-		expect(html).to.equal('<div data-foo="bar" class="foo bar"><span id="some_id">inner!</span>ab</div>');
+		expect(html).to.equal('<div class="foo bar" data-foo="bar"><span id="some_id">inner!</span>ab</div>');
 	});
 });