[SiteEngagement WebUI] Replace C++ browser test with JS version.

chrome/test/data/webui/engagement/site_engagement_browsertest.js

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview Test suite for the Site Engagement WebUI.
+ */
+var ROOT_PATH = '../../../../../';
+var EXAMPLE_URL_1 = 'http://example.com/';
+var EXAMPLE_URL_2 = 'http://shmlexample.com/';
+
+GEN('#include "chrome/browser/engagement/site_engagement_service.h"');
+GEN('#include "chrome/browser/engagement/site_engagement_service_factory.h"');
+GEN('#include "chrome/browser/ui/browser.h"');
+
+function SiteEngagementBrowserTest() {}
+
+SiteEngagementBrowserTest.prototype = {
+  __proto__: testing.Test.prototype,
+
+  browsePreload: 'chrome://site-engagement',
+
+  runAccessibilityChecks: false,
+
+  isAsync: true,
+
+  testGenPreamble: function() {
+    GEN('SiteEngagementService* service =');
+    GEN('  SiteEngagementServiceFactory::GetForProfile(browser()->profile());');
+    GEN('service->ResetBaseScoreForURL(GURL("' + EXAMPLE_URL_1 + '"), 10);');
+    GEN('service->ResetBaseScoreForURL(GURL("' + EXAMPLE_URL_2 +
+        '"), 3.14159);');
+  },
+
+  extraLibraries: [
+    ROOT_PATH + 'third_party/mocha/mocha.js',
+    ROOT_PATH + 'chrome/test/data/webui/mocha_adapter.js',
+  ],
+
+  /** @override */
+  setUp: function() {
+    testing.Test.prototype.setUp.call(this);
+    suiteSetup(function() {
+      return whenPageIsPopulatedForTest();
+    });
+  },
+};
+
+TEST_F('SiteEngagementBrowserTest', 'All', function() {
+  test('check engagement values are loaded', function() {
+    var originCells =
+        Array.from(document.getElementsByClassName('origin-cell'));
+    assertDeepEquals(
+        [EXAMPLE_URL_1, EXAMPLE_URL_2], originCells.map(x => x.textContent));
+  });
+
+  test('scores rounded to 2 decimal places', function() {
+    var scoreInputs =
+        Array.from(document.getElementsByClassName('base-score-input'));
+    assertDeepEquals(['10', '3.14'], scoreInputs.map(x => x.value));
+    var bonusScoreCells =
+        Array.from(document.getElementsByClassName('bonus-score-cell'));
+    assertDeepEquals(['0', '0'], bonusScoreCells.map(x => x.textContent));
+    var totalScoreCells =
+        Array.from(document.getElementsByClassName('total-score-cell'));
+    assertDeepEquals(['10', '3.14'], totalScoreCells.map(x => x.textContent));
+  });
+  mocha.run();
+});