Add automated ui testing about dyn365-ce-devops HOT 3 OPEN

We already have automated ui testing in the reference app:
https://github.com/devkeydet/CrmAsyncRequestResponseSampleV2/tree/master/UIAutomationTests

However, there is a known issue with https://github.com/Microsoft/EasyRepro/ when executing a headless test with the phantomjs driver:
devkeydet/CrmAsyncRequestResponseSampleV2#23

See:
microsoft/EasyRepro#47

Once the issue is resolved, we'll update one of the release builds to show how to run the ui automation test.

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Two options:
-Spin up our own agent with a browser installed and use the browser driver (adds complexity)
-Wait until phantomjs is working

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@devkeydet I believe there's another working option you can use today.

Microsoft.Dynamics365.UIAutomation.Browser.BrowserOptions now supports headless for Chrome, which works in a hosted build agent:

public static class TestSettings
{
    public static BrowserOptions Options { get { return _options; } }

    private static BrowserOptions _options = new BrowserOptions
    {
        BrowserType = BrowserType.Chrome,
        PrivateMode = true,
        FireEvents = true,
        Headless = true
    };
}

Then in your build definition, just install Chrome before running your UI tests by running a PowerShell script task:

$Path = $env:TEMP;
$Installer = "chrome_installer.exe";
Invoke-WebRequest "http://dl.google.com/chrome/install/375.126/chrome_installer.exe" -OutFile $Path\$Installer;
Start-Process -FilePath $Path\$Installer -Args "/silent /install" -Verb RunAs -Wait;
Remove-Item $Path\$Installer

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