Bitpay\Storage\FilesystemStorageTest::testLoadNotReadableException PHP Method

    public function testLoadNotReadableException()
    {
        $storage = new FilesystemStorage();
        vfsStream::newFile('public.key', 0600)->at($this->root)->setContent('C:16:"Bitpay\\PublicKey":62:{a:5:{i:0;s:20:"vfs://tmp/public.key";i:1;N;i:2;N;i:3;N;i:4;N;}}')->chown(vfsStream::OWNER_ROOT)->chgrp(vfsStream::GROUP_ROOT);
        $storage->load(vfsStream::url('tmp/public.key'));
    }