Error in test using from django.contrib.auth.models import User

I am using the django.contrib.auth and came across the following error:

Creating test database for alias 'default'...
...EE..
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ERROR: test_create (new_way.core.tests.test_models.EmployeeTest)
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Traceback (most recent call last):
  File "/home/rg3915/git/my/new_way_project/new_way/core/tests/test_models.py", line 121, in setUp
    comission=180.5
  File "/home/rg3915/git/my/new_way_project/lib/python3.4/site-packages/django/db/models/base.py", line 452, in __init__
    raise TypeError("'%s' is an invalid keyword argument for this function" % list(kwargs)[0])
TypeError: 'birthday' is an invalid keyword argument for this function

======================================================================
ERROR: test_has_created_at (new_way.core.tests.test_models.EmployeeTest)
Employee must have automatic created_at
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Traceback (most recent call last):
  File "/home/rg3915/git/my/new_way_project/new_way/core/tests/test_models.py", line 121, in setUp
    comission=180.5
  File "/home/rg3915/git/my/new_way_project/lib/python3.4/site-packages/django/db/models/base.py", line 452, in __init__
    raise TypeError("'%s' is an invalid keyword argument for this function" % list(kwargs)[0])
TypeError: 'birthday' is an invalid keyword argument for this function

----------------------------------------------------------------------
Ran 7 tests in 0.010s

FAILED (errors=2)
Destroying test database for alias 'default'...

See my models.

http://ift.tt/1CUD9to

I suspect this error related to the User.