Fixes https://github.com/microsoft/playwright/issues/30160
### Description:
This pull request introduces the ability to specify custom locations for
test steps in Playwright. By enabling the provision of arbitrary
locations to the test.step method, it resolves the limitation where
helper methods obfuscate the original call site, providing more accurate
and meaningful location data in test reports.
### Motivation:
To enhance the utility and clarity of test reports in Playwright.
Specifically, it addresses the need to trace test steps back to their
precise location in the code, which is especially important when steps
are abstracted in helper functions. This feature is crucial for
maintaining accurate documentation and facilitating debugging processes.
### Changes:
Added functionality to pass a custom location object to test.step.
### Expected Outcome:
This PR is expected to significantly improve the precision and
usefulness of diagnostic data in test reports by allowing specific
locations within helper functions to be accurately documented. It
facilitates better tracking of test executions and simplifies the
debugging process, making it easier for developers to understand and
address issues within complex tests.
### References:
Closes https://github.com/microsoft/playwright/issues/30160 -
"[Feature]: allow to pass arbitrary location to test.step"
**Code Check**
I conducted tests on this new feature by integrating it into some
existing test codes, and it worked well. I will attach the code used for
testing and a screenshot showing the successful outcome.
<details>
<summary>toggle dropdown</summary>
<div markdown="1">
```
import type { Location } from '../../../packages/playwright/types/testReporter'
...
test('should respect the back button', async ({ page }) => {
await page.locator('.todo-list li .toggle').nth(1).check();
await checkNumberOfCompletedTodosInLocalStorage(page, 1);
...
await test.step('Showing active items', async () => {
await page.getByRole('link', { name: 'Active' }).click();
}, {location});
```
<img width="1109" alt="image"
src="https://github.com/user-attachments/assets/359feafa-0949-4c71-9426-46debef21bdd">
</div>
</details>
Changes `expect.extend` behaviour so that it doesn't mutate the global
instance and behaves closer to what users expect. This is formally a
breaking change, and I had to remove a test that asserts the breaking
behaviour.
TODO:
- [x] decide wether this is a separate method or a flag for
`expect.extend`
- [x] figure out if we need to change docs
Previously, we would use any error that was added during the step
execution as an error for this particular step.
This produces false positives, for example failing `page.click` call
that happened during `context` teardown was producing an error and
marking teardown is failed. However, in reality, the test itself has
failed, while teardown has not.
New approach uses test step hierarchy to inherit errors from child steps
to the parent step. This does not regress the original fix where
`expect.soft` errors are surfaced in the parent step.
See also #19973 that introduced the original logic.
