angular-docs-cn/modules/benchmarks/e2e_test/naive_infinite_scroll_spec.ts

import {verifyNoBrowserErrors} from '@angular/testing/src/e2e_util';
import {runClickBenchmark} from '@angular/testing/src/perf_util';

describe('ng2 naive infinite scroll benchmark', function() {

  var URL = 'benchmarks/src/naive_infinite_scroll/index.html?appSize=3';

  afterEach(verifyNoBrowserErrors);

  it('should not throw errors', function() {
    browser.get(URL);
    var expectedRowCount = 18;
    var expectedCellsPerRow = 27;
    var allScrollItems = 'scroll-app #testArea scroll-item';
    var cells = `${ allScrollItems } .row *`;
    var stageButtons = `${ allScrollItems } .row stage-buttons button`;

    var count = function(selector) {
      return browser.executeScript(`return ` +
                                   `document.querySelectorAll("${ selector }").length;`);
    };

    var clickFirstOf = function(selector) {
      return browser.executeScript(`document.querySelector("${ selector }").click();`);
    };

    var firstTextOf = function(selector) {
      return browser.executeScript(`return ` +
                                   `document.querySelector("${ selector }").innerText;`);
    };

    // Make sure rows are rendered
    count(allScrollItems).then(function(c) { expect(c).toEqual(expectedRowCount); });

    // Make sure cells are rendered
    count(cells).then(function(c) { expect(c).toEqual(expectedRowCount * expectedCellsPerRow); });

    // Click on first enabled button and verify stage changes
    firstTextOf(`${ stageButtons }:enabled`)
        .then(function(text) {
          expect(text).toEqual('Pitched');
          clickFirstOf(`${ stageButtons }:enabled`)
              .then(function() {
                firstTextOf(`${ stageButtons }:enabled`)
                    .then(function(text) { expect(text).toEqual('Won'); })
              });
        });

    $("#reset-btn").click();
    $("#run-btn").click();
    browser.wait(() => {
      return $('#done').getText().then(function() { return true; }, function() { return false; });
    }, 10000);
  });

});