Does it work only in the same scope?

In a situation like this:

```perl
               
    my $README_mock = Test::MockFile->file( "README.md", $fakeREADME );
    $returnedREADME = pre_objetivo_0( \@mock_repo_files ); # tries to read README.md inside
```

it does not seem to work, trying to read the "real" README. Is that intended or a bug?
