Test file kindly provided by:

Allen Institute 
https://alleninstitute.org/

© 2019 Allen Institute for Brain Science. Download page of the Allen Institute. Available from: http://download.alleninstitute.org/informatics-archive/prerelease/

The files are governed by the Terms of Use linked here: 
https://alleninstitute.org/legal/terms-use/

This file will soon be replaced by a new version of data in NWB 2 format including:

intracellular electrophysiology:
Human: https://gui.dandiarchive.org/#/dandiset/000109
Mouse: https://gui.dandiarchive.org/#/dandiset/000020

Extracellular electrophysiology:
https://gui.dandiarchive.org/#/dandiset/000022
https://gui.dandiarchive.org/#/dandiset/000021
https://registry.opendata.aws/allen-brain-observatory/

2-photon optical physiology
https://allensdk.readthedocs.io/en/latest/_static/examples/nb/visual_behavior_ophys_data_access.html