TakesScreenshot : Selenium WebDriver provides TakesScreenshot interface to capture the screenshot of any element in the webpage. This can be useful to understand what's visible on the page at any point in time.

Browser Console Logs : WebDriver can interact with the browser's console and retrieve logs. This can be useful to understand errors or messages logged by the webpage. These are some ways you can debug a Selenium scraper. The best approach often depends on the specific issue you are facing.

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Thank you for participating in the discussion. There are a series of articles on the Cloud Testing Blog blog. com about capturing screenshots with Selenium. The Cloud Testing service offers this all plus more with a Pay As You Test model - see www. I tried once to make screenshots but it was rather useless - you can see only the upper part of the web page which is often not enough i like the way WebTest Canoo does it.

Cloud Testing has extended this to also work with Safari, Opera and Chrome. This will hopefully be integrated back into the main Selenium release soon. See blog. for more details. InfoQ Software Architects' Newsletter A monthly overview of things you need to know as an architect or aspiring architects.

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Jul 06, less than one minute by Chris Sims. Setting this environment variable will cause Firefox to log additional messages to the console.

Use this environment variable together with webdriver. In order to get detailed information from IEDriverServer. For example, to demonstrate an issue with clicking on elements, a test case should be added to ClickTest. The test cases already have a driver instance - no need to create one.

Their URLs are provided by the Pages class, so when adding a page and add it to the Pages class as well. We can use a web browser or tools such as telnet to interact with a RemoteWebDriverServer e. to debug the JSON protocol.

Want to support the Selenium project? Learn more or view the full list of sponsors. Documentation Legacy Developers Tips Legacy Code! Developer Tips Details on how to execute Selenium Test Suite with Crazy Fun. Last modified January 10, More wiki [deploy site] adcfa1ad.

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Recently uploaded 20 Diamond exploration, mining, financing and driving entrepreneurial behaviour. pdf 1. Different Techniques Of Debugging Selenium Based Test Scripts Different Techniques Of Debugging Selenium Based Test Scripts Writing and maintaining the test automation code is not always a piece of cake.

Debugging is the primary skill set that an automation tester must adopt. It increases the morale and confidence in automation testers to provide a better code solution to fix the problem permanently.

Debugging issues in the test automation framework becomes more complicated when the test automation framework has a huge number of test cases. With the expansion of features in the application, the number of test cases gradually increases.

In such a scenario, fixing complex issues of hybrid frameworks might require enhanced techniques of debugging. In this article, we will deep dive into such essential debugging techniques that will not only fix script issues easily but also save a good amount of debugging time.

What is Debugging? In simple terms, debugging is a process of software engineering to identify and resolve an error in the source code by adopting various debugging techniques. Debugging is basically divided into four common stages: 1.

Identification: The first step of debugging is to discover the issue and try reproducing the same in the local system to know why the issue occurred. This is an important step as we need to identify the root cause of the issue to deploy a permanent solution.

Isolation: Is the second step where the idea is to separate the buggy code from the healthier code. The unit testing of buggy code is required to identify the steps that need to be performed to fix the issue.

Isolation of buggy code would further reduce time and not affect the other code. Resolution: This is the primary step towards fixing the buggy code. Leave a comment and share with the InfoQ community.

Join a community of over , senior developers. You need to Register an InfoQ account or Login or login to post comments. But there's so much more behind being registered. by Phil Smith ,. by Tomasz Kaczanowski ,. Your message is awaiting moderation. Thank you for participating in the discussion.

There are a series of articles on the Cloud Testing Blog blog. com about capturing screenshots with Selenium. The Cloud Testing service offers this all plus more with a Pay As You Test model - see www. I tried once to make screenshots but it was rather useless - you can see only the upper part of the web page which is often not enough i like the way WebTest Canoo does it.

Cloud Testing has extended this to also work with Safari, Opera and Chrome. This will hopefully be integrated back into the main Selenium release soon. See blog. for more details. InfoQ Software Architects' Newsletter A monthly overview of things you need to know as an architect or aspiring architects.

View an example Enter your e-mail address. Select your country Select a country I consent to InfoQ. com handling my data as explained in this Privacy Notice. In JavaScript, you can use debugger; statement to pause the execution. It works in the same way as pdb in Python. You can use logging to record what your scraper is doing.

This is very useful to understand the flow of your program and identify where it might be going wrong. TakesScreenshot : Selenium WebDriver provides TakesScreenshot interface to capture the screenshot of any element in the webpage.

This can be useful to understand what's visible on the page at any point in time. Browser Console Logs : WebDriver can interact with the browser's console and retrieve logs.

This can be useful to understand errors or messages logged by the webpage. These are some ways you can debug a Selenium scraper.

While Selenium has gained wide acceptance as a useful tool for automating browser-level tests, tracking down the cause of test failures can take significant time.

Daniel Wellman has shared two of his best tricks to greatly reduce debugging time for failed Selenium tests. The first technique is to capture a screenshot any time a test fails.

There are a couple of methods provided to support this: captureScreenshot , and captureScreenshotToString. The post Capture Screenshots of Selenium Failures , on the YouDevise Developer blog provides some example Java code for how this approach might be implemented.

The second technique is to capture the HTML DOM contents when a test fails. For this, Wellman recommends using the method getHtmlSource to capture the contents of the DOM and write them out to a file.

Taking the time to incorporate these two techniques could pay off handsomely in time saved debugging. This is not the first time that Wellman has written about the value of investing in your tools to gain more productivity. What improvements have you made to your toolset, testing or otherwise, that had big payoffs for you?

Leave a comment and share with the InfoQ community. Join a community of over , senior developers. You need to Register an InfoQ account or Login or login to post comments.

But there's so much more behind being registered. by Phil Smith ,. by Tomasz Kaczanowski ,. Your message is awaiting moderation. Thank you for participating in the discussion.

There are a series of articles on the Cloud Testing Blog blog. com about capturing screenshots with Selenium. Various Techniques Of Debugging Test Automation Scripts The number of automated test cases does not always work smoothly, as a matter of fact, the change in UI of an application or change in business logic of an application can ruin the execution of Selenium based test scripts.

The reason for test script failure is not always a buggy code in the test automation framework, but can also fail due to the bug found in the application itself. Hence, the proper use of assertions is mandatory to identify the basic reason for test case failure before moving to an advanced level of debugging.

Whenever we are developing the Selenium Test Automation framework from scratch, it is important to have utilities imported to help improve the debugging of source code.

At the time of failures, it becomes very challenging to debug the buggy code with the usual java console output.

Debugging With Logging Utilities Logging utilities help developers to output a variety of logs as per the target. In case of issues in the test scripts, the logging can be enabled to identify the exact location of buggy code. This is a Java based open source framework and can be used for logging purposes by just importing the maven dependency.

Loggers offer different severity levels for logs. It sends the log events to the destination folder or prints on console as per the configuration done. There are three types of appenders available to output the logs:  ConsoleAppender  FileAppender  Rolling File Appender  Layouts : Layouts provide different methods for formatting of the logs.

The logging information can be formatted in different formats with the below provided methods:. Hence, we would always want to know where exactly the test case failed so that we can take the necessary steps towards fixing the issue. The idea that can be adopted to fulfill such a case is to capture a screenshot of the webpage at the moment where the test script failed.

And later, as a part of debugging, looking at the screenshots we can easily identify where our test method failed. Selenium provides an interface TakesScreenshot that can be used to capture screenshots of web pages. import java. File; import org. FileUtils; import org.

import org. OutputType; import org. TakesScreenshot; import org. WebDriver; import org. WebElement; import org. ChromeDriver; import org. Assert; import org.

ITestResult; import org. AfterClass; import org. AfterMethod; import org. BeforeClass; import org. Test; import io. setup ;. findElement By. getTitle ; Assert. getScreenshotAs OutputType.

FILE ; FileUtils. getMessage ; } } } AfterClass public void tearDown { driver. quit ;. Session Recording This is another advanced way of debugging.

As the execution time of a regression suite is too long, it is difficult to sit tight and observe the entire execution of the constantly failing test cases. In such cases we can enable the session recording and save it for future debugging purposes.

With this, we can easily visualize and validate the test actions and ensure that no unexpected alerts and elements are popping up.

Session recording is an enhanced level debugging comparative to logs or screenshot capturing but it is probably useful when the test suite contains a huge number of test cases.

Since there is no direct support from Selenium to record test sessions, you may use a third party tool like Monte Media Library.

If you want to skip writing the code to record selenium sessions, you can also install third party software in your physical machine for screen recording like SimpleScreenRecorder, this also provides a feature to schedule the recording.

Adding Breakpoints Breakpoints are a part of IDE that can temporarily halt the execution of the code. Once the execution gets paused at the breakpoint, we can acquire data of the essential elements in the source code.

The debugging with breakpoints can be done easily with the below sequence:  Set up the breakpoints where buggy code is observed  Execute the source code in debug mode  Validate the data returned in debugger  Resume the debugging if multiple breakpoints are added  Stop the debug mode execution  Fix error and deploy the code The above is a screenshot of the Intellij IDE in which 4 breakpoints are added.

The checkmarks appear on the added breakpoints at run-time as soon as the breakpoint is recognized by the debugger. In case multiple breakpoints are added in the code, the execution can be resumed by pressing F9 to acquire data from different breakpoints. Debugging with breakpoints leverages automation testers to fix the issues in interactive mode.

Debugging Selenium Tests On Already Opened Browser Many times it so happens that only the last few steps of the test method are observed as constant failures.

In such cases, we can fix the buggy code and execute the entire test again. This consumes a lot of execution time and till then we have to sit tight to observe whether the updated code at the end of the test method is working fine or not.

To overcome this situation, we can debug selenium based test scripts on an already opened browser. This would save time in executing healthier code and will only execute the code that needs to be verified.

To achieve this use case, we would be using Chrome DevTools Protocol that allows clients to inspect and debug chrome browsers. Once you run the above mentioned command on the terminal, the fresh chrome browser should get launched.

By; import org. ChromeOptions; import org. click ; driver. dhamija gmail. AfterClass public void tearDown { driver.

quit ; } } Code Walkthrough: Once we have opened the pCloudy website manually on debugging chrome browser, we have then executed the above test script to continue from the same opened browser.

To set up the test on an already opened browser, we have used Chrome Options set Experimental Option method to set the experimental option i. debugger Address. The debugger address would be the same address on which the debugging chrome is launched.

Parallel Execution and Debugging In an era where fast feedback loops are crucial, parallel execution of tests has become an essential practice. Selenium supports running tests in parallel, which helps in significantly reducing the test execution time.

However, running tests in. parallel can introduce new debugging challenges. What is Parallel Execution? Parallel execution involves running multiple tests simultaneously rather than sequentially. This is particularly useful in large test suites, which can take a long time to execute.

By distributing the tests across multiple threads or processes, you can cut down the execution time considerably. Challenges in Debugging Parallel Tests  Shared Resources: When tests run in parallel, they may access shared resources like files or databases.

This can cause conflicts if not managed properly. When using Loadero these screenshots can be taken using our custom commands.

If you already have some tests in Loadero or just planning to create some, make sure to add the commands to take screenshots. Our Wiki explains how to achieve that in NightwatchJS. After test execution the screenshots can be found in participant results view under Artifacts tab.

More on screenshots and Loadero test results view is explained in this blog post about results reports. In the real world, there is no downside for using screenshots. Matter of fact, we would recommend at least creating screenshots at the main possible problematic points.

That can possibly save time and costs for relaunching the test. While writing tests we strongly recommend opening the website using a fresh incognito or private tab. This helps to avoid all possibilities for previously set settings and cache.

The simplest things like cookie banners or pop-ups are often forgotten. If this is the case, sadly there is not out of the box way to bypass it.

There are many more techniques for your test script debugging, we explained just six to help you start. Some of the described approaches can be used not only for debugging purposes. Session recordings and screenshots are also very useful in performance testing as well. Sign up for our free trial and run multiple performance tests free of charge.

Use the debugging techniques to prepare your tests for future large scale testing. If you will require any assistance during exploration, make sure to contact our helpful support team at support loadero.

In the last decade the application market has grown significantly. Messaging, fintech, and other web…. There are two main causes for traffic increase that e-commerce service owners anticipate and absolutely…. Save my name, email, and website in this browser for the next time I comment. General How to 6 Ways of Selenium Test Scripts Debugging By Pauls Grūdups September 10, Local testing One of the easiest ways to validate your script is by running it locally on your own machine.

In case you want to try this method, here are the links where to get both of the frameworks that we support in Loadero: Nightwatch JavaScript TestUI Java Verbose Selenium logging If verbose logging is enabled, then more action by the framework will be logged.

Verbose log Console logs In case of test failure browser console logs have to be always checked. Console log Session recording This is a way of test script debugging that we are proud to offer to our service users. Screenshots Without a doubt, the easiest and quickest way to debug your automated testing script is using screenshots.