Testing my Django App

Good day All,

I am currently running a test for my Django app call 'Books'.

Anytime I run an INDEX test, I get the following error below:

"File "/Users/macbookpro/.local/share/virtualenvs/first_django_app-mymO4nCn/lib/python3.7/site-packages/django/db/backends/sqlite3/base.py", line 396, in execute

    return Database.Cursor.execute(self, query, params)

django.db.utils.IntegrityError: NOT NULL constraint failed: books_book.user_id"

Please can anyone point to what the issue is or what I am doing wrong. 

Thanks and Regards,

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