How To Automate Cross Browser Testing

Daniel Herken
dherken@browseemall.com
http://www.browseemall.com
How To Automate Cross Browser Testing
Automation

Today we will cover
1. When to automate?
2. Static page testing
3. Dynamic page testing
Introduction

Creating these automation tasks takes time and resources so make sure that:
• you need to support a high number of browsers
• you need to do regression tests multiple times
• you have a suitable test execution environment
• you have a clear plan when and how to execute the tests
When to automate?
Automation makes sense if the test need to be repeated often!

Define to number of browsers that need testing in advance.
When to automate?
Which browsers need testing?

• How to install a Selenium Grid
• Install ImageMagick for picture comparison
When to automate?
Requirements:

o Develop by using a known-good browser
o Use Selenium to take a known-good screenshot
o Use Selenium to take screenshots in all other browsers that need testing
o Use ImageMagick to compare these screenshots for problems
o Manually review the screenshot comparison for real problems
Static Page Testing
How to automate?

Static Page Testing
public static void TestGoogleHomepage()
{
// Create a screenshot with a known good browser first
IWebDriver chromeDriver = new RemoteWebDriver(TestParameter.SeleniumHubUrl, DesiredCapabilities.Chrome());
GetPageScreenshot(chromeDriver, Path.Combine(basePath, "chrome.png"));
// Create screenshots in the other browsers we need to support
IWebDriver firefoxDriver = new RemoteWebDriver(TestParameter.SeleniumHubUrl, DesiredCapabilities.Firefox());
GetPageScreenshot(firefoxDriver, Path.Combine(basePath, "firefox.png"));
// Create screenshot comparison
ScreenshotHelper.CreateComparison(Path.Combine(basePath, "chrome.png"), Path.Combine(basePath, "firefox.png"), Path.Combine(basePath, "fi
}
private static void GetPageScreenshot(IWebDriver driver, string screenshotPath)
{
// Change to the correct resolution
driver.Manage().Window.Size = new System.Drawing.Size(TestParameter.Width, TestParameter.Height);
// Open Homepage
driver.Navigate().GoToUrl(TestUrl);
// Take Screenshot
ScreenshotHelper.TakeScreenshot(driver, screenshotPath);
driver.Quit();
}

o Develop by using a known-good browser
o Use Selenium to automate all user interaction
o Take screenshots between each user interaction step
o Use ImageMagick to compare these screenshots for problems
o Manually review the screenshot comparison for real problems
Dynamic Page Testing
How to automate?

Dynamic Page Testing
public static void TestGoogleHomepage()
{
// Create a screenshot with a known good browser first
IWebDriver chromeDriver = new RemoteWebDriver(TestParameter.SeleniumHubUrl, DesiredCapabilities.Chrome());
GetPageScreenshot(chromeDriver, Path.Combine(basePath, "chrome.png"));
[…]
// Create screenshot comparison
ScreenshotHelper.CreateComparison(Path.Combine(basePath, "chrome.png"), Path.Combine(basePath, "firefox.png"), Path.Combine(basePath, "fi
}
private static void GetPageScreenshots(IWebDriver driver, string screenshotPath)
{
// Change to the correct resolution
driver.Manage().Window.Size = new System.Drawing.Size(TestParameter.Width, TestParameter.Height);
// Open Homepage
driver.Navigate().GoToUrl(TestUrl);
// Take Screenshot
ScreenshotHelper.TakeScreenshot(driver, screenshotPath[0], isFirefox);
// Do more user actions & take more screenshots
driver.Quit();
}

TakeScreenshot();
public static void TakeScreenshot(IWebDriver driver, string path)
{
IJavaScriptExecutor jsExecutor = (IJavaScriptExecutor)driver;
ITakesScreenshot takesScreenshot = (ITakesScreenshot)driver;
// Generate Bitmap
Image finalScreenshot = new Bitmap(TestParameter.Width, TestParameter.Height);
// Scroll to top
jsExecutor.ExecuteScript("window.scrollTo(0,0);", new object[] { });
byte[] screenshot = takesScreenshot.GetScreenshot().AsByteArray;
using (MemoryStream stream = new MemoryStream(screenshot))
{
Bitmap originalScreenshot = (Bitmap)Bitmap.FromStream(stream);
Bitmap parsedScreenshot = ResizeBitmap(originalScreenshot, TestParameter.Width, TestParameter.Height);
parsedScreenshot.Save(path, ImageFormat.Png);
parsedScreenshot.Dispose();
originalScreenshot.Dispose();
}
}

How To Automate Cross Browser Testing

Recommended

More Related Content

What's hot (20)

Viewers also liked (6)

Similar to How To Automate Cross Browser Testing (20)

Recently uploaded (20)

How To Automate Cross Browser Testing