Test failures

[matoro]

After silencing the system check error for the deprecated CommaSeparatedIntegerField (https://code.kodo.org.uk/dom/django/commit/dca8b916ffa391964be26bbd62471d4c11b221fd), the test suite fails with four errors. The first is caused by test-image.png not getting included in the package directory, but I'm not sure about the cause of the other three:

.E.......EE................E......................
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ERROR: test_image_from_directory (tests.tests.TestImageHelpers)
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Traceback (most recent call last):
  File "/var/tmp/portage/dev-python/django-sampledatahelper-0.4.1/work/django-sampledatahelper-0.4.1-python3_6/tests/tests.py", line 504, in test_image_from_directory                                                                                                                                                  
    value = self.sd.image_from_directory(os.path.dirname(__file__))
  File "/var/tmp/portage/dev-python/django-sampledatahelper-0.4.1/work/django-sampledatahelper-0.4.1-python3_6/sampledatahelper/helper.py", line 56, in image_from_directory                                                                                                                                            
    random_path = self.image_path_from_directory(directory_path, valid_extensions)
  File "/usr/lib/python3.6/site-packages/sampledata/mixins/image_mixin.py", line 23, in image_path_from_directory
    raise NotChoicesFound('Not valid images found in directory_path for valid_extensions')
sampledata.exceptions.NotChoicesFound: Not valid images found in directory_path for valid_extensions

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ERROR: test_fill_model (tests.tests.TestModelDataHelpers)
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Traceback (most recent call last):
  File "/var/tmp/portage/dev-python/django-sampledatahelper-0.4.1/work/django-sampledatahelper-0.4.1-python3_6/tests/tests.py", line 691, in test_fill_model
    self.mdh.fill_model(models.TestModel, 5)
  File "/var/tmp/portage/dev-python/django-sampledatahelper-0.4.1/work/django-sampledatahelper-0.4.1-python3_6/sampledatahelper/model_helper.py", line 59, in fill_model                                                                                                                                                
    self.fill_model_instance(instance, *args, **kwargs)
  File "/var/tmp/portage/dev-python/django-sampledatahelper-0.4.1/work/django-sampledatahelper-0.4.1-python3_6/sampledatahelper/model_helper.py", line 70, in fill_model_instance                                                                                                                                       
    value = handler.generate()
  File "/var/tmp/portage/dev-python/django-sampledatahelper-0.4.1/work/django-sampledatahelper-0.4.1-python3_6/sampledatahelper/handlers.py", line 10, in generate                                                                                                                                                      
    return self._generate()
  File "/var/tmp/portage/dev-python/django-sampledatahelper-0.4.1/work/django-sampledatahelper-0.4.1-python3_6/sampledatahelper/handlers.py", line 153, in _generate                                                                                                                                                    
    if self.instance.rel.limit_choices_to:
AttributeError: 'ForeignKey' object has no attribute 'rel'

======================================================================
ERROR: test_fill_model_instance (tests.tests.TestModelDataHelpers)
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Traceback (most recent call last):
  File "/var/tmp/portage/dev-python/django-sampledatahelper-0.4.1/work/django-sampledatahelper-0.4.1-python3_6/tests/tests.py", line 679, in test_fill_model_instance                                                                                                                                                   
    self.mdh.fill_model_instance(instance)
  File "/var/tmp/portage/dev-python/django-sampledatahelper-0.4.1/work/django-sampledatahelper-0.4.1-python3_6/sampledatahelper/model_helper.py", line 70, in fill_model_instance                                                                                                                                       
    value = handler.generate()
  File "/var/tmp/portage/dev-python/django-sampledatahelper-0.4.1/work/django-sampledatahelper-0.4.1-python3_6/sampledatahelper/handlers.py", line 10, in generate                                                                                                                                                      
    return self._generate()
  File "/var/tmp/portage/dev-python/django-sampledatahelper-0.4.1/work/django-sampledatahelper-0.4.1-python3_6/sampledatahelper/handlers.py", line 153, in _generate                                                                                                                                                    
    if self.instance.rel.limit_choices_to:
AttributeError: 'ForeignKey' object has no attribute 'rel'

======================================================================
ERROR: test_calling_command (tests.tests.TestSampleDataHelperCommand)
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Traceback (most recent call last):
  File "/var/tmp/portage/dev-python/django-sampledatahelper-0.4.1/work/django-sampledatahelper-0.4.1-python3_6/tests/tests.py", line 743, in test_calling_command                                                                                                                                                       
    call_command('sampledatafiller', interactive=False)
  File "/usr/lib/python3.6/site-packages/django/core/management/__init__.py", line 140, in call_command
    ', '.join(sorted(valid_options)),
TypeError: Unknown option(s) for sampledatafiller command: interactive. Valid options are: help, no_color, pythonpath, settings, skip_checks, stderr, stdout, traceback, verbosity, version.                                                                                                                            

----------------------------------------------------------------------
Ran 50 tests in 11.796s


FAILED (errors=4)                                                                                     
Operations to perform:                                                                                                                                                                                                                                                                                                  
  Synchronize unmigrated apps: sampledatahelper, tests
  Apply all migrations: auth, contenttypes, sessions                                                                                                                                                                                                                                                                    
Synchronizing apps without migrations:    
  Creating tables...                                                               
    Creating table tests_testrelatedmodel
    Creating table tests_testmodel                                                                                
    Running deferred SQL...                                                                                      
Running migrations:                                                                                                
  Applying contenttypes.0001_initial... OK                                                                                
  Applying contenttypes.0002_remove_content_type_name... OK                                                                                                                                                                                                                                                             
  Applying auth.0001_initial... OK                                                                  
  Applying auth.0002_alter_permission_name_max_length... OK                                                                                                                                                                                                                                                             
  Applying auth.0003_alter_user_email_max_length... OK
  Applying auth.0004_alter_user_username_opts... OK                                                                                                                                                                                                                                                                     
  Applying auth.0005_alter_user_last_login_null... OK                                                              
  Applying auth.0006_require_contenttypes_0002... OK                                                                                                                                                                                                                                                                    
  Applying auth.0007_alter_validators_add_error_messages... OK     
  Applying auth.0008_alter_user_username_max_length... OK 
  Applying auth.0009_alter_user_last_name_max_length... OK
  Applying sessions.0001_initial... OK                                
Creating test database for alias 'default'...                        
System check identified no issues (1 silenced).                       
Destroying test database for alias 'default'...