Base unittest for my Django projects

basetest.py

from cStringIO import StringIO

from django.utils import unittest
from django.core.files.uploadedfile import InMemoryUploadedFile
from django.test.client import Client


class BaseTest(unittest.TestCase):
    def _delete_objects(self):
        models = getattr(self, 'models', [])
        for model in models:
            model.objects.all().delete()

    def get_image(self):
        return InMemoryUploadedFile(
                StringIO(TEST_IMAGE),
                field_name='image',
                name='image.png',
                content_type='image/png',
                size=len(TEST_IMAGE),
                charset='utf-8'
            )

    def setUp(self):
        self._delete_objects()

        if hasattr(self, 'setup'):
            self.setup()

        self.client = Client()

    def tearDown(self):
        self._delete_objects()

        if hasattr(self, 'teardown'):
            self.teardown()


TEST_IMAGE = '''
iVBORw0KGgoAAAANSUhEUgAAADkAAAA5CAYAAACMGIOFAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJ
bWFnZVJlYWR5ccllPAAAA1BJREFUeNrsW7+LE0EU3g1BC5EzJ14hFhLhmsNC1korIdpZXHGprbxS
rPRPiJVYamVtCgs7CWhjI7eVXCO4WJwWp5dVDhFzF9c3YYOTPTfzvcy7yVzMgyFLMhnmzffe935M
EmZZFsy6VIL/QOZKzpWcK+mXVMs+CO88hBY4t3pLvdRodIHpT2isA/M2aESGOQmNC1vPn468mT26
e2hINsB5CTCnBiioJLZGkil1ZNKXNy9bv7Y/txSiZAHrNmt934zXdt+/y4aIuvBJ5OSDvfQrgihk
Ffs/dmFEK66QVJv6vddDNlaDDuzbjlMlIR/SNmXamBFJdVgakokLJSEf6v1VMiF/TG2tgkNAEkpK
+lCEmCuR1/AxdYWkpA9BVqH5NhKS3CDJ8CGIpTUkO8j8sKyeLGY85Edr9PLM08ytTZlPUyLjiQJ/
JZYy17qvGu68fa2yqKzM0iqSvjct0Xw0nlhJ8keI2qchKv6a2LYyQyiWsi2qpLek0xuNv+msI9mx
qicpBi3mj4q9VLwMFlai4OTyRaSGLJrUATm+dDY4c/UGUkMGVEOywwg342noG2PWkKVy7NRprmn+
S+yQ1GRR21jXxLiFGvI6sXTZRh7TuM04sPu01oPcyg4nd0VDCqOGNBKbOiyw6BZL0KVryIhBMM6U
hEIKo4bkrJUaDswtkmANGTGtosPd7KRKStaQ0IH1GT0dayXJVGoQ6YyGDkkkYxdINpibUj5k1Q0o
xMfEhZJ1QdKpc0MRHRgbySpgmt1JnLZ26cpg5Mhb3dmfOL88GLkM10r15MQGSW8Tcw7LViVMcxqi
XfgYETUh6W0dyWlLHklzVTG4J3Hh43NfB2l5oEh6Szp6DA4sL3y89UctBkMMWx3T8mjmj/dotNAW
xc9PH1Wz1zhv6dpNY0dAIbb96sW4KVBigGQ8EadFUbg7tGp59M1rJVZIajJAdGElauWoov7SJvJq
jjm4DU5STmtdLrE40dwVIqK+4BXdvkV5NamSxuyHEb8ki24ZJclUoGqh4I9WSHJ//CCBJPcGODWU
RBHzwGIXSkre5XNrSFPRPTUkO76QDhpCDiQGwFfSMdTephHmiH4A1oqRMCHZ/kBTvY7gWtZIhvN/
E8yVPDryR4ABAG3Ck37A5mBdAAAAAElFTkSuQmCC'''.strip().decode('base64')