Django tests failing for development env

I want to contribute to Django community, so I was trying to setup my env using the following doc - 

https://docs.djangoproject.com/en/dev/intro/contributing/

I ran the tests and get the following output - 

======================================================================

FAIL: test_old_style_storage (file_storage.tests.FileFieldStorageTests)

----------------------------------------------------------------------

Traceback (most recent call last):

  File "/Users/prem/Documents/django-contribute/django/tests/file_storage/tests.py", line 566, in test_old_style_storage

    self.assertEqual(len(warns), 2)

AssertionError: 4 != 2

======================================================================

FAIL: test_migrate_legacy_router (multiple_database.tests.RouterTestCase)

----------------------------------------------------------------------

Traceback (most recent call last):

  File "/Users/prem/Documents/django-contribute/django/tests/multiple_database/tests.py", line 954, in test_migrate_legacy_router

    self.assertEqual(recorded, [])

AssertionError: Lists differ: [<warnings.WarningMessage object at 0x1130bdda0>] != []

First list contains 1 additional elements.

First extra element 0:

{message : DeprecationWarning('inspect.getargspec() is deprecated, use inspect.signature() instead',), category : 'DeprecationWarning', filename : '/Users/premDocuments/django-contribute/django/django/db/utils.py', lineno : 293, line : None}

- [<warnings.WarningMessage object at 0x1130bdda0>]

+ []

======================================================================

FAIL: test_if_tag_eq_deprecated (template_tests.syntax_tests.test_if.IfTagTests)

----------------------------------------------------------------------

Traceback (most recent call last):

  File "/Users/prem/Documents/django-contribute/django/django/test/utils.py", line 182, in inner

    return test_func(*args, **kwargs)

  File "/Users/prem/Documents/django-contribute/django/tests/template_tests/utils.py", line 62, in inner

    func(self)

  File "/Users/prem/Documents/django-contribute/django/tests/template_tests/syntax_tests/test_if.py", line 537, in test_if_tag_eq_deprecated

    self.assertEqual(len(warns), 1)

AssertionError: 3 != 1

======================================================================

FAIL: test_only_new_files (utils_tests.test_autoreload.TestFilenameGenerator)

----------------------------------------------------------------------

Traceback (most recent call last):

  File "/Users/prem/Documents/django-contribute/django/tests/utils_tests/test_autoreload.py", line 87, in test_only_new_files

    self.assertEqual(len(filenames2), 1)

AssertionError: 0 != 1

----------------------------------------------------------------------

Ran 9637 tests in 202.521s

FAILED (failures=4, skipped=856, expected failures=6)

Destroying test database for alias 'default'...

Destroying test database for alias 'other'.

Not sure, if the errors are valid or not. One thing I see is expected failures =6

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