What is the clean way to unittest FileField in django?

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Django provides a great way to do this – use a SimpleUploadedFile or a TemporaryUploadedFile. SimpleUploadedFile is generally the simpler option if all you need to store is some sentinel data:

from django.core.files.uploadedfile import SimpleUploadedFile

my_model.file_field = SimpleUploadedFile(
    "best_file_eva.txt",
    b"these are the file contents!"   # note the b in front of the string [bytes]
)

It’s one of django’s magical features-that-don’t-show-up-in-the-docs :). However it is referred to here and implemented here.

Limitations

Note that you can only put bytes in a SimpleUploadedFile since it’s implemented using BytesIO behind the scenes. If you need more realistic, file-like behavior you can use TemporaryUploadedFile.

For Python 2

If you’re stuck on python 2, skip the b prefix in the content:

my_model.file_field = SimpleUploadedFile(
    "best_file_eva.txt",
    "these are the file contents!" # no b
)

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