Set the GDS-SSO test user explicitly
Set the GDS-SSO test user explicitly

Avoids a race condition between Users being 
created and the test user being looked up.

leftees/publisher,alphagov/publisher,alphagov/publisher,telekomatrix/publisher,leftees/publisher,telekomatrix/publisher,leftees/publisher,telekomatrix/publisher,telekomatrix/publisher,leftees/publisher,alphagov/publisher