Trace and Debugging Tests

In this lesson from the "Test Guild UI Automation with Playwright" course, Artem Bondar covers how to analyze and debug code in Playwright. Here's what you'll learn:

1. **Trace Mode**:
- **Running Tests with Trace Mode**: Learn to enable Trace mode when running tests via the command line with `npx playwright test --project=chromium --trace=on`. This mode captures detailed execution data.
- **Viewing Trace Reports**: Understand how to access and interpret Trace reports, which include step-by-step execution details before and after each action, useful for debugging tests, especially in Continuous Integration (CI) environments.
- **Configuration Options**: Know how to configure Trace mode in `Playwright.config.ts` to always generate a Trace, even for successful tests, by setting `trace: 'on'`.

2. **Playwright Debugger (Inspector)**:
- **Launching the Debugger**: Learn to start the Playwright Inspector with `npx playwright test --debug`. This opens two windows: the Playwright Inspector and a browser instance.
- **Step-by-Step Execution**: Use the Inspector to run tests step-by-step, observing detailed logs of each action (e.g., clicks, navigation, assertions). This helps you understand the precise behavior of your script and identify where issues occur.

3. **Built-In Visual Studio Code Debugger**:
- **Setting Breakpoints**: Discover how to set breakpoints in your code within Visual Studio Code to pause execution at specific lines.
- **Debugging from Test Explorer**: Run tests in debug mode directly from the Test Explorer by clicking the debug icon. Visual Studio Code's interface will highlight the line of code where execution is paused, showing detailed call stacks and variable values.
- **Interactive Debugging**: Learn to use Visual Studio Code's debugging features, such as hovering over variables to see their values, to gain deeper insights into your code and identify issues.

These debugging techniques equip you with powerful tools to analyze and troubleshoot your Playwright tests, ensuring your automation scripts run smoothly and effectively. By mastering these methods, you'll be able to quickly diagnose and resolve test failures, enhancing your productivity and confidence in using Playwright. See you in the next lesson!

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