feat(test): add e2e tests for benchmarks and examples

Disables running the actual benchmarks on every commit as well
to speed up the build.

modules/examples/e2e_test/hello_world/hello_world_spec.es6

@@ -0,0 +1,30 @@
+var benchpress = require('../../../../tools/benchpress/index.js');
+describe('hello world', function () {
+
+  afterEach(benchpress.verifyNoBrowserErrors);
+
+  describe('static reflection', function() {
+    var URL = 'examples/web/hello_world/index_static.html';
+
+    it('should greet', function() {
+      browser.get(URL);
+
+      expect(getShadowText('hello-app')).toBe('hello world!');
+    });
+  });
+
+  describe('dynamic reflection', function() {
+    var URL = 'examples/web/hello_world/index.html';
+
+    it('should greet', function() {
+      browser.get(URL);
+
+      expect(getShadowText('hello-app')).toBe('hello world!');
+    });
+  });
+
+});
+
+function getShadowText(selector) {
+  return browser.executeScript('return document.querySelector("'+selector+'").shadowRoot.textContent');
+}