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Writing your first test with Playwright and Python
Are you curious about how to write automated tests with Playwright and Python? Writing your first test can seem intimidating, but it doesn’t have to be. This blog post will take you through all the steps necessary for writing your first test with Playwright and Python. With clear and helpful explanations, you’ll be able to create reliable tests quickly and confidently. So let’s get started!
Why use Playwright for Python end-to-end testing?
Playwright is an open-source library designed to make end-to-end (E2E) testing more straightforward and reliable. It can be used to write Python tests capable of automating any web browser, including Chromium, Firefox, WebKit, and others. It has a simple API that makes it easy for developers to write cross-browser tests using a single codebase.
Using Playwright for Python E2E testing offers many advantages. For example, it simplifies the process of writing automated tests by providing an API that allows developers to interact with all modern web browsers from one codebase. Furthermore, Playwright ensures better test coverage by enabling cross-browser compatibility testing—including testing on mobile devices—without additional effort or setup.
Playwright also provides several features designed explicitly for E2E testing in Python. These include
- Automatic waiting, which enables tests to pause until the page is ready for a specific element is present;
- Automatically generated screenshots and videos for debugging purposes;
- The ability to run tests in headless mode allows developers to speed up execution time.
Finally, Playwright’s reliable and fast performance ensures that automated tests can be executed reliably and quickly across multiple browsers. This helps developers reduce development time by catching errors earlier in the process.
Overall, Playwright provides an efficient solution for automating E2E tests with Python. Its comprehensive API and features designed specifically for E2E testing offer a robust platform for writing cross-browser-compatible tests quickly and reliably.
Writing Your First Test with Playwright and Python
Assumptions and Requirements
Writing your first test with Playwright and Python can be an exciting journey for developers. Before you start writing your test, there are a few assumptions and requirements that need to be taken into consideration.
Firstly, it is assumed that you have a working knowledge of Python, HTML, CSS, and JavaScript. Knowing these languages will help you write practical tests with Playwright. Secondly, it is also assumed that you have already installed Playwright on your machine.
If these assumptions are met, you are ready to write your first test with Playwright and Python. The basic structure of a Playwright test consists of three parts: the setup phase, the interactions phase, and the verification phase.
The setup phase defines the environment in which the test will run. This includes setting up browser contexts like device type or viewport size and setting user agent strings or cookies before launching the browser instance.
The Interactions phase defines the actions performed on the page, such as clicking a button, filling out a form, or navigating to a different page.
Finally, the verification phase is where you check for expected results. This could include checking if the correct element was clicked or the predicted value was filled in correctly.
Following these steps, you can write your first test with Playwright and Python. This can be an effective tool for automating web applications and ensuring that user flows are working correctly.
Writing Your First Test with Playwright and Python
Step 1: Install Python’s Latest Version
The 1st step is to ensure that you have the latest version of Python installed on your computer. You can download it from the official website or your operating system’s package manager.
Step 2: Install Playwright and Its WebKit
Once you have the latest version of Python installed, you’ll need to install Playwright and its WebKit browser engine. To do this, you need to make sure that you have both Node.js and npm installed on your machine. Once these are installed, open a terminal and run:
`npm install playwright`
Step 3: Create a Project Folder
Next, you’ll need to create a project folder for your Playwright tests. This should be a dedicated folder for the project and have the same name as your project. For example, if your project is named “MyProject,” then create a folder with that name and place all your test files in it. Navigate to the desired directory in your terminal and run:
`mkdir playwright-test && cd playwright-test`
Step 4: Create a basic test
Once inside the project directory, let’s create a basic Python test using Playwright. Create a new file in your project directory named `test.py` and open it in your favorite text editor.
In this file, type:
“`Python
from playwright import sync_playwright
with sync_playwright() as p:
browser = p.chromium.launch()
page = browser.newPage()
page.goto(‘http://www.example.com’)
page_text = page.content()
assert ‘Example Domain’ in page_text
“`
This code will launch a Chromium browser, navigate to example.com, and verify that the page’s content includes “Example Domain” – it’s that simple!
You can check out the official documentation or try tutorials on the LambdaTest Platform to learn more about Playwright. With Playwright, you can create robust, powerful tests quickly and easily. Start writing your tests today and see what magic Playwright can do!
Implementing parallel testing with Playwright Python
is an efficient way to ensure that web applications function correctly across multiple browsers and platforms. This section will walk you through the steps necessary to implement parallel testing with Playwright Python.
- Install Playwright Python: The first step is to install Playwright Python, which can be done with pip or conda. With pip, use the command `pip install playwright`. With conda, use the command `conda install -c conda-forge playwright`.
- Create a Browser Context: Once Playwright is installed, create a browser context using `with playwright.chromium.launch() as browser` for Chrome, `with playwright.firefox.launch() as browser` for Firefox, and `with playright.webkit.launch() as browser` for Safari respectively.
- Creating Pages: After creating a browser context, create pages using ‘page = await browser.newPage()` command.
- Define Parallelization: Now, define the parallelization by creating a list and populating it with the page objects you created in step 3. For example `pages = [page1, page2]`.
- Using Asyncio: With Playwright Python, we can use asyncio to handle multiple tasks concurrently with an event loop that runs tasks in serial order. To do this, use the following commands `import asyncio` and `asyncio.gather(*pages)`.
- Running Tests: Finally, run your tests simultaneously using the gather command from step 5 and await the results using `await asyncio.gather(*pages)`. This will run all of your tests in parallel asynchronously and return results when completed.
By following these steps you can quickly implement parallel testing with PlaywrightPython. This will make your tests run faster and more efficiently while providing reliable results. Additionally, you can quickly scale up the number of tasks you run in parallel depending on your needs.
Writing your first automated test with Playwright and Python
Writing your first automated test with Playwright and Python can be simple. To begin, you will need to install the Playwright package using the pip command: `pip install playwright .`This will install all the necessary libraries and packages to run your tests.
Once you have installed Playwright, you can start writing your first automated test. First, you will need to import the necessary components from Playwright into your code: `from playwright import *.` This line of code is essential to ensure that your tests are running correctly in Python.
Next, you will need to create an instance of the browser where you will be running your automated tests. For this example, we are going to use Chrome: `browser = Chromium().` You can also choose from Firefox or WebKit if desired.
Now that we have our browser set up, it’s time to open a new page for our automated tests page = browser.newPage()`. This will open up a new page in the browser window that we are using.
Now it’s time to write our first automated test! For this example, we will use a simple test to check if a text document is correctly opened.
First, we will need to open the file: `page.goto(“file:///<path-to-text-document>”)`. Replace<path-to-text-document> with the full path to the text document you want to test.
Next, we need to check if the file was opened correctly. To do this, we will use an assertion: `assert page.querySelector(‘body’).innerText == “Hello World.”` This assertion will check if the text inside the HTML document’s body is equal to “Hello World.”
Finally, we need to close our browser and end our test: `browser.close()`. This will ensure that our automated tests are not running in the background after completing them.
And that’s it! Our first automated test using Playwright and Python is now ready for use. With these basic steps, you can now create your automated tests for any website or application you need to test! Good luck and happy testing!
Why choose LambdaTest Playwright Cloud?
With LambdaTest’s Playwright cloud, you can effortlessly scale your test execution without worrying about setting up or maintaining an in-house testing infrastructure. With 50+ real browsers and operating system combinations available, you can be sure that your tests will execute as expected across multiple platforms. Here are some examples of how this can be useful:
- Automated Regression Testing: You can use LambdaTest’s Playwright cloud to quickly run automated regression testingon all supported browsers and operating systems to identify any bugs or issues that have been introduced with the latest changes. This ensures that your application remains bug-free and stable for your users.
- Compatibility Testing: You can ensure that your application works correctly on all supported devices and platforms by running tests on multiple different browser and OS combinations. LambdaTest’s Playwright cloud makes it easy to test for cross-platform compatibility to ensure that your users have a great experience regardless of their device or operating system.
- Performance Testing: You can use LambdaTest’s Playwright cloud to quickly and easily perform performance testing on your application. With its robust infrastructure, you can measure the responsiveness of your application and identify any bottlenecks that may be slowing down your users’ experience.
- Scalability Testing: You can use LambdaTest’s Playwright cloud to run scalability tests on your application as it grows in popularity. This will ensure that your application remains stable and reliable even when used by many users simultaneously.
Running playwright tests on LambdaTest can be done in just three easy steps
Integrate: Integrating your playwright tests with LambdaTest is easy. You must add a few lines of code to your existing scripts and then configure the environment for execution. For example, if you’re using NodeJS for your automation, you can use the following code snippet to define your test configuration:
var browser = await playwright[browserType] ;
const config = {
platformName: ‘Windows 10’,
browserName: ‘chrome,’
version : ’80’
};
const driver = new webdriver.Builder()
.usingServer(‘@lambdatest.com’)
.withCapabilities(config)
.build();
driver.get(‘www.google.com’);
Execute: After integrating and configuring your playwright tests with LambdaTest, you can execute your test cases instantly on a scalable cloud-based infrastructure. To start the execution process, log in to your LambdaTest account and select the desired browser and platform configurations for testing. You can also use the provided API or a CI/CD platform integration to trigger playwright tests on different browsers across multiple platforms.
You can execute your playwright tests with LambdaTest in three easy steps. First, log in to the LambdaTest platform and select the desired configuration for your test execution. Select the browsers, operating systems, and other settings that you need for testing. Then upload your test scripts to execute them on the platform. Finally, click ‘run’ to start the tests.
Scale: LambdaTest allows you to scale up your playwright test executions by running tests simultaneously on multiple browsers and operating systems. To achieve this, you can use our Parallel Testing feature that enables parallel testing of test scripts across multiple platforms and browsers.
This feature allows you to selectively choose which platforms or browsers to run your tests on. This helps reduce your overall test cycle time and improve test coverage for various web browsers and operating systems.
In summary, with LambdaTest, integrating playwright tests is easy and hassle-free, and you can scale up your test execution on multiple browsers and platforms to get comprehensive test coverage.
Conclusion
Creating tests with Playwright and Python is a great way to ensure that your applications work as expected. Setting up a test suite will save time in the long run and ensure that any changes have been appropriately tested.
This tutorial showed you how to write a basic Python test with Playwright – now it’s time to explore what else Playwright has to offer! With its wide range of tools and features, you’ll be able to create reliable, robust tests in no time. So get started today and see what Playwright can do for you!
