Added test for preserving nested components on rerender

test/autotests/components-browser/preserve-nested/components/hello.marko

@@ -0,0 +1,10 @@
+static var renderCount = 0;
+
+class {
+
+}
+
+<div.hello>
+    Hello ${input.name}!
+    <span.render-count>${renderCount++}</span>
+</div>

test/autotests/components-browser/preserve-nested/index.marko

@@ -0,0 +1,6 @@
+class {
+}
+
+<div>
+    <hello name="Frank"/>
+</div>

test/autotests/components-browser/preserve-nested/test.js

@@ -0,0 +1,12 @@
+var expect = require('chai').expect;
+
+module.exports = function(helpers) {
+    var component = helpers.mount(require('./index'), {});
+
+    expect(component.el.querySelector('.render-count').innerHTML).to.equal('0');
+
+    component.forceUpdate();
+    component.update();
+
+    expect(component.el.querySelector('.render-count').innerHTML).to.equal('0');
+};