10/11/2021 0 Comments Chrome Driver Selenium For Mac
We are trying to run multiple instances of Chrome on the SAME machine so we can divide the tests into groups to run simultaneously. Chrome is the fastest browser, but even so, it takes hours. My company uses Selenium for automated testing and currently, our tests take 3-4 hours to run.Using a headless browser allows easy access to this content because the content is rendered exactly as it would be in a full browser. In addition to this, traditional web-oriented tasks like web scraping can be difficult to do if the content is rendered dynamically (say, via Javascript). If you’re trying to check how a page may render in a different browser or confirm that page elements are present after a user initiates a certain workflow, using a headless browser can provide a lot of assistance. In short, headless browsers are web browsers without a graphical user interface (GUI) and are usually controlled programmatically or via a command-line interface.One of the many use cases for headless browsers is automating usability testing or testing browser interactions. If we want to load the default chrome browser or custom chrome profile, we can pass 'user-data-dir' argument to ChromeOptions which is Chrome command-line switch to tell Chrome which profile to use.Execute Selenium test on chrome browser on MAC using Selenium Septemby Mukesh Otwani 12 Comments To start any third party browser (Chrome, Opera etc.) Chrome browser on MAC using Selenium we have to use some drivers which will interact with the browsers.Before we dive into any code, let’s talk about what a headless browser is and why it’s useful. Since the respective flags are already available on Chrome Canary, the Duo Labs team thought it would be fun to test things out and also provide a brief introduction to driving Chrome using Selenium and Python.Whenever we launch chrome browser using selenium, a new instance/a temp profile will be created for each new session.
Chrome Selenium Driver Into The$ cd going_headless & virtualenv -p python3 envThe next thing we need to do is install Selenium. I use virtualenv, so if you use another virtual environment manager, the commands may be different. Going Headless SetupBefore we get started, we need to install Chrome Canary and download the latest ChromeDriver (currently 5.29).Next, let’s make a folder that will contain all of our files:Now we can move the ChromeDriver into the directory that we just made:$ mv Downloads/chromedriver going_headless/Since we are using Selenium with Python, it’s a good idea to make a Python virtual environment. As a result, we can expect lower memory overhead and faster execution for the scripts that we write. Both are associated with having to display the browser with the rendered graphics from the URL that was requested.When using a headless browser, we don’t have to worry about that.Our goal is to write a script that searches for my name “Olabode” on duo.com, and checks that a recent article I wrote about Android security is listed in the results. To install the Selenium package for Python, we can run the following:Now that we’ve gotten all of that out of the way, let’s get to the fun part. It has language bindings for Java, C#, Ruby, Javascript (Node), and Python. Magnifying_glass = driver.find_element_by_id("js-open-icon")Now we clear the search field, search for my name, and send the RETURN key to the drive. If it isn’t, we click the menu button to enter our search term. As a result, we check to see if the expected search button is displayed. Chrome_options = Options()Chrome_options.binary_location = '/Applications/Google Chrome Canary.app/Contents/MacOS/Google Chrome Canary'The driver.get function will be used navigate to the specified URL.The duo.com website is responsive, so we have to handle different conditions. While the gains in our example were very minimal, these gains would prove to be beneficial in a test suite with dozens of tests. We polled CPU and memory usage with psutil and measured the time for task completion using timeit.For our small script, there were very small differences in the amount of time taken to complete the task (4.3%), memory usage (.5%), and CPU percentage (5.2%). Using the same script above, we profiled the time it took to complete the tasks, peak memory usage, and CPU percentage. Benchmarks Head to HeadlessSo, it’s cool that we can now control Chrome using Selenium and Python without having to see a browser window, but we are more interested in the performance benefits we talked about earlier. Service = webdriver.chrome.service.Service(os.path.abspath(“chromedriver"))The final thing we have to do is create a WebDriver that can connect to a remote server. We do so by creating a service object with a path to the ChromeDriver and then we can start the service. In order to manually control the ChromeDriver server, we have to use the ChromeDriverService. Example Snippet import osService = webdriver.chrome.service.Service(os.path.abspath(“chromedriver"))# path to the binary of Chrome Canary that we installed earlierDriver = webdriver.Remote(service.service_url, desired_capabilities=chrome_options.to_capabilities())While there are only three lines of code that have changed, let’s talk about what’s going on in them. Luckily, we can manually start and stop the server ourselves, and it only requires a few changes to the script above. For a one-off script, that isn’t a problem, but this can waste a nontrivial amount of time for a large test suite that creates a ChromeDriver instance for each test. We hope this helps you get started using the headless version of Chrome whether you’re doing any type of QA testing or are automating all your daily web-related tasks. And with the announcement that the creator of PhantomJS is stepping down as a maintainer, we strongly believe that headless Chrome is the future of headless browsers.While we covered Selenium in this walkthrough, it is worth mentioning that the Chrome DevTools API can be a useful resource if you’re doing any type of profiling or need to create PDFs of pages that you visit. The median time for the headless and headed browser to complete the tasks in the script decreased by 11% (4.72 seconds) and respectively 4% (5.29 seconds).The release of headless Chrome has long been awaited. Driver = webdriver.Remote(service.service_url, desired_capabilities=chrome_options.to_capabilities())By adding the manual starting of the service, we saw the expected speed increases.
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