For testing the signup page, add fake Facebook SocialApp credentials
For testing the signup page, add fake Facebook SocialApp credentials

Without a SocialApp object for Facebook, viewing the sign-up page throws
the error:

  ImproperlyConfigured: No Facebook app configured: please add a SocialApp using the Django admin

To avoid this, create a SocialApp for Facebook with fake credentials in
the setUp method for the tests that load the sign-up page.

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