def getCSV():
    response = HttpResponse(content_type='text/csv')
    response['Content-Disposition'] = 'attachment; filename=export.csv'
    writer = csv.writer(response, csv.excel)

    # ... Write some CSV content ...

    return response

c = Client()
r = c.get('/my/export/api')
print(r.content)

import csv
import io

def test_csv_export(self):

    response = self.client.get('/my/export/api')
    self.assertEqual(response.status_code, 200)

    content = response.content.decode('utf-8')
    cvs_reader = csv.reader(io.StringIO(content))
    body = list(cvs_reader)
    headers = body.pop(0)

    print(body)
    print(headers)