text: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  import pickle
  
  from django.core.files.uploadedfile import SimpleUploadedFile
  from django.forms import FileField, ValidationError
  from django.test import SimpleTestCase
  
  
  class FileFieldTest(SimpleTestCase):
  
      def test_filefield_1(self):
          f = FileField()
          with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
              f.clean('')
          with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
              f.clean('', '')
          self.assertEqual('files/test1.pdf', f.clean('', 'files/test1.pdf'))
          with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
              f.clean(None)
          with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
              f.clean(None, '')
          self.assertEqual('files/test2.pdf', f.clean(None, 'files/test2.pdf'))
          no_file_msg = "'No file was submitted. Check the encoding type on the form.'"
          with self.assertRaisesMessage(ValidationError, no_file_msg):
              f.clean(SimpleUploadedFile('', b''))
          with self.assertRaisesMessage(ValidationError, no_file_msg):
              f.clean(SimpleUploadedFile('', b''), '')
          self.assertEqual('files/test3.pdf', f.clean(None, 'files/test3.pdf'))
          with self.assertRaisesMessage(ValidationError, no_file_msg):
              f.clean('some content that is not a file')
          with self.assertRaisesMessage(ValidationError, "'The submitted file is empty.'"):
              f.clean(SimpleUploadedFile('name', None))
          with self.assertRaisesMessage(ValidationError, "'The submitted file is empty.'"):
              f.clean(SimpleUploadedFile('name', b''))
          self.assertEqual(SimpleUploadedFile, type(f.clean(SimpleUploadedFile('name', b'Some File Content'))))
          self.assertIsInstance(
              f.clean(SimpleUploadedFile('我隻氣墊船裝滿晒鱔.txt', 'मेरी मँडराने वाली नाव सर्पमीनों से भरी ह'.encode('utf-8'))),
              SimpleUploadedFile
          )
          self.assertIsInstance(
              f.clean(SimpleUploadedFile('name', b'Some File Content'), 'files/test4.pdf'),
              SimpleUploadedFile
          )
  
      def test_filefield_2(self):
          f = FileField(max_length=5)
          with self.assertRaisesMessage(ValidationError, "'Ensure this filename has at most 5 characters (it has 18).'"):
              f.clean(SimpleUploadedFile('test_maxlength.txt', b'hello world'))
          self.assertEqual('files/test1.pdf', f.clean('', 'files/test1.pdf'))
          self.assertEqual('files/test2.pdf', f.clean(None, 'files/test2.pdf'))
          self.assertIsInstance(f.clean(SimpleUploadedFile('name', b'Some File Content')), SimpleUploadedFile)
  
      def test_filefield_3(self):
          f = FileField(allow_empty_file=True)
          self.assertIsInstance(f.clean(SimpleUploadedFile('name', b'')), SimpleUploadedFile)
  
      def test_filefield_changed(self):
          """
          The value of data will more than likely come from request.FILES. The
          value of initial data will likely be a filename stored in the database.
          Since its value is of no use to a FileField it is ignored.
          """
          f = FileField()
  
          # No file was uploaded and no initial data.
          self.assertFalse(f.has_changed('', None))
  
          # A file was uploaded and no initial data.
          self.assertTrue(f.has_changed('', {'filename': 'resume.txt', 'content': 'My resume'}))
  
          # A file was not uploaded, but there is initial data
          self.assertFalse(f.has_changed('resume.txt', None))
  
          # A file was uploaded and there is initial data (file identity is not dealt
          # with here)
          self.assertTrue(f.has_changed('resume.txt', {'filename': 'resume.txt', 'content': 'My resume'}))
  
      def test_file_picklable(self):
          self.assertIsInstance(pickle.loads(pickle.dumps(FileField())), FileField)
  