About Dummy Files in Unit Tests

You can create uploaded files in unit tests using the SimpleUploadedFile class:

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from PIL import Image
from io import BytesIO
from django.core.files.uploadedfile import SimpleUploadedFile

image = Image.new("RGB", (1,1), color=(255, 0, 0))
image_content = BytesIO()
image.save(image_content, "JPEG")
image_content.seek(0)
self.media_file = MediaFile.objects.create(
    title="Photo of a Unicorn",
    image=SimpleUploadedFile(
        name="unicorn.jpg",
        content=image_content.read(),
        content_type="image/jpeg",
    ),
)

Don't forget to delete the files in tearDown(self) or tearDownClass(cls) method:

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self.media_file.image.delete()
self.media_file.delete()

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