Fixes to import_cas.py

            with open(os.path.join(directory, "content", rootname, dirnames, filename), "wt") as f:

                f.write(content)

def file_contents_are(path, contents):

    with open(path, "r") as f:

        result = f.read() == contents

    return result

def test_cas_import(cli, tmpdir):

    fake_context = FakeContext()