def METHOD_NAME(organisation_factory, ImagePNG):
    organisation = organisation_factory(image=ImagePNG, logo=ImagePNG)
    image_path = os.path.join(settings.MEDIA_ROOT, organisation.image.path)
    logo_path = os.path.join(settings.MEDIA_ROOT, organisation.logo.path)
    thumbnail_image_path = create_thumbnail(organisation.image)
    thumbnail_logo_path = create_thumbnail(organisation.logo)
    assert os.path.isfile(thumbnail_image_path)
    assert os.path.isfile(thumbnail_logo_path)
    assert os.path.isfile(image_path)
    assert os.path.isfile(logo_path)
    count = models.Organisation.objects.all().count()
    assert count == 1
    organisation.delete()
    assert not os.path.isfile(thumbnail_image_path)
    assert not os.path.isfile(thumbnail_logo_path)
    assert not os.path.isfile(image_path)
    assert not os.path.isfile(logo_path)
    count = models.Organisation.objects.all().count()
    assert count == 0