Debugging tests

If your tests aren't working as you expect, you can debug them in both the default Node.js environment and in a real browser.

Debugging in Node.js

Debugging in the default Node.js environment is often the quickest way to diagnose issues that are not related to browser-specific APIs or rendering.

Run the ng test command with the --debug flag:
```
ng test --debug
```
The test runner will start in debug mode and wait for a debugger to attach.
You can now attach your preferred debugger. For example, you can use the built-in Node.js debugger in VS Code or the Chrome DevTools for Node.js.

Debugging in a browser

Debugging in a browser is recommended for tests that rely on the DOM or other browser-specific APIs. This approach allows you to use the browser's own developer tools.

Ensure you have a browser provider installed. See Running tests in a browser for setup instructions.
Run the ng test command with both the --browsers and --debug flags:
```
ng test --browsers=chromium --debug
```
This command runs the tests in a headed browser and keeps it open after the tests finish, allowing you to inspect the output.
Open the browser's Developer Tools. On Windows, press Ctrl-Shift-I. On macOS, press Command-Option-I.
Go to the Sources tab.
Use Control/Command-P to search for and open your test file.
Set a breakpoint in your test.
Reload the test runner UI in the browser. The execution will now stop at your breakpoint.