def METHOD_NAME():
    CodingSystemRelease.objects.create(
        release_name="unk",
        coding_system="opcs4",
        valid_from=date(2020, 1, 1),
        state=ReleaseState.READY,
    )
    # opcs4 has no coding system data, so we allow uploads without code validation
    form = CSVValidationMixin()
    # wrap CSV up in SimpleUploadedFile to mirror how a Django view would
    # handle it
    csv_data = "code,description\n0301012A0AA,Adrenaline (Asthma)"
    upload_file = csv_builder(csv_data)
    uploaded_file = SimpleUploadedFile("our csv", upload_file.read())
    form.cleaned_data = {"csv_data": uploaded_file, "coding_system_id": "opcs4"}
    assert form.clean_csv_data() == csv_data