[WebDriver BiDi] Fix file test

[Lightning00Blade]

I took a look at this failing test and it seems that the test itself is the issue:
From the long we sent two different files:
Files in the first input.setFiles command:

"files": [ "/tmp/wdspec-t_9y6_4n/pytest/wdspec-0/path/to/noop.txt" ]

Files in second input.setFiles command:

 "files": [ "/tmp/wdspec-t_9y6_4n/pytest/wdspec-1/path/to/noop.txt" ]

This means that they will be treated as separate files.

This is happening because https://github.com/web-platform-tests/wpt/blob/fix-file-test/webdriver/tests/bidi/input/set_files/conftest.py#L18 we create a new temp folder in each invocation of the fixture.

[sadym-chromium]

nice catch!

[Lightning00Blade]

@lutien Can you please check why this was passing previously on Firefox?

[lutien]

Thanks for the fix!

[lutien]

@lutien Can you please check why this was passing previously on Firefox?

In Firefox at the moment we don't have access to the full path of the file only to the name of it, that's why we fail test_set_files_twice_same_in_different_folders test.