Django factory boy, image fields not created?

I tried to follow the standard recipe for image fields for django factory boy:

class ConfigurationSingletonFactory(DjangoModelFactory):
    class Meta:
        model = Configuration
        django_get_or_create = ("id",)

    id = 1

    custom_theme = ImageField(color="blue", width=200, height=200)



class GeneralConfiguration(SingletonModel):
    custom_theme = PrivateMediaImageField("Custom background", upload_to="themes", blank=True)

However whenever I try to test it:

def test_config(self):
    conf = GeneralConfigurationSingletonFactory(
        custom_theme__name="image.png"
    )
    print(conf.custom_theme.width)
    self.assertEqual(conf.custom_theme.width, 200)

The following error pops up:

ValueError: The 'custom_theme' attribute has no file associated with it.

What am I misunderstanding, I thought I did exactly what https://factoryboy.readthedocs.io/en/stable/orms.html#factory.django.ImageField says?

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