public function testPermissionsAreCheckedWhenRemovingFiles()
{
$fs = new FileSystem();
$file = $fs->createFile('/file');
$file->chmod(00);
$wr = new Wrapper();
$this->assertTrue($wr->unlink($fs->path('/file'), 'Allows removals with writable parent'));
$fs->root()->chmod(0500);
$this->assertFalse(@$wr->unlink($fs->path('/file'), 'Does not allow removals with non-writable parent'));
$error = error_get_last();
$this->assertStringMatchesFormat('rm: %s: Permission denied', $error['message']);
}
