def cmd_crossfade(self, conn, crossfade):
        crossfade = cast_arg(int, crossfade)
        if crossfade < 0:
            raise BPDError(ERROR_ARG, u'crossfade time must be nonnegative')
A LICENSE file is written to the top level directory from a template in
dataset/ETHPy150Open beetbox/beets/beetsplug/bpd/__init__.py/BaseServer.cmd_crossfade--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/admin/test/test_release.py/UpdateLicenseFileTests.test_update_license_file