allow_blank, allow_null

1 files changed, 0 insertions, 1633 deletions

diff --git a/tests/test_fields.py b/tests/test_fields.py
deleted file mode 100644
index 3cfc1b88..00000000
--- a/tests/test_fields.py
+++ /dev/null
@@ -1,1633 +0,0 @@
-from decimal import Decimal
-from django.utils import timezone
-from rest_framework import fields
-import datetime
-import django
-import pytest
-
-
-def get_items(mapping_or_list_of_two_tuples):
-    # Tests accept either lists of two tuples, or dictionaries.
-    if isinstance(mapping_or_list_of_two_tuples, dict):
-        # {value: expected}
-        return mapping_or_list_of_two_tuples.items()
-    # [(value, expected), ...]
-    return mapping_or_list_of_two_tuples
-
-
-class FieldValues:
-    """
-    Base class for testing valid and invalid input values.
-    """
-    def test_valid_inputs(self):
-        """
-        Ensure that valid values return the expected validated data.
-        """
-        for input_value, expected_output in get_items(self.valid_inputs):
-            assert self.field.run_validation(input_value) == expected_output
-
-    def test_invalid_inputs(self):
-        """
-        Ensure that invalid values raise the expected validation error.
-        """
-        for input_value, expected_failure in get_items(self.invalid_inputs):
-            with pytest.raises(fields.ValidationError) as exc_info:
-                self.field.run_validation(input_value)
-            assert exc_info.value.messages == expected_failure
-
-    def test_outputs(self):
-        for output_value, expected_output in get_items(self.outputs):
-            assert self.field.to_representation(output_value) == expected_output
-
-
-# Boolean types...
-
-class TestBooleanField(FieldValues):
-    valid_inputs = {
-        'true': True,
-        'false': False,
-        '1': True,
-        '0': False,
-        1: True,
-        0: False,
-        True: True,
-        False: False,
-    }
-    invalid_inputs = {
-        'foo': ['`foo` is not a valid boolean.']
-    }
-    outputs = {
-        'true': True,
-        'false': False,
-        '1': True,
-        '0': False,
-        1: True,
-        0: False,
-        True: True,
-        False: False,
-        'other': True
-    }
-    field = fields.BooleanField()
-
-
-# String types...
-
-class TestCharField(FieldValues):
-    valid_inputs = {
-        1: '1',
-        'abc': 'abc'
-    }
-    invalid_inputs = {
-        '': ['This field may not be blank.']
-    }
-    outputs = {
-        1: '1',
-        'abc': 'abc'
-    }
-    field = fields.CharField()
-
-
-class TestEmailField(FieldValues):
-    valid_inputs = {
-        'example@example.com': 'example@example.com',
-        ' example@example.com ': 'example@example.com',
-    }
-    invalid_inputs = {
-        'examplecom': ['Enter a valid email address.']
-    }
-    outputs = {}
-    field = fields.EmailField()
-
-
-class TestRegexField(FieldValues):
-    valid_inputs = {
-        'a9': 'a9',
-    }
-    invalid_inputs = {
-        'A9': ["This value does not match the required pattern."]
-    }
-    outputs = {}
-    field = fields.RegexField(regex='[a-z][0-9]')
-
-
-class TestSlugField(FieldValues):
-    valid_inputs = {
-        'slug-99': 'slug-99',
-    }
-    invalid_inputs = {
-        'slug 99': ["Enter a valid 'slug' consisting of letters, numbers, underscores or hyphens."]
-    }
-    outputs = {}
-    field = fields.SlugField()
-
-
-class TestURLField(FieldValues):
-    valid_inputs = {
-        'http://example.com': 'http://example.com',
-    }
-    invalid_inputs = {
-        'example.com': ['Enter a valid URL.']
-    }
-    outputs = {}
-    field = fields.URLField()
-
-
-# Number types...
-
-class TestIntegerField(FieldValues):
-    """
-    Valid and invalid values for `IntegerField`.
-    """
-    valid_inputs = {
-        '1': 1,
-        '0': 0,
-        1: 1,
-        0: 0,
-        1.0: 1,
-        0.0: 0
-    }
-    invalid_inputs = {
-        'abc': ['A valid integer is required.']
-    }
-    outputs = {
-        '1': 1,
-        '0': 0,
-        1: 1,
-        0: 0,
-        1.0: 1,
-        0.0: 0
-    }
-    field = fields.IntegerField()
-
-
-class TestMinMaxIntegerField(FieldValues):
-    """
-    Valid and invalid values for `IntegerField` with min and max limits.
-    """
-    valid_inputs = {
-        '1': 1,
-        '3': 3,
-        1: 1,
-        3: 3,
-    }
-    invalid_inputs = {
-        0: ['Ensure this value is greater than or equal to 1.'],
-        4: ['Ensure this value is less than or equal to 3.'],
-        '0': ['Ensure this value is greater than or equal to 1.'],
-        '4': ['Ensure this value is less than or equal to 3.'],
-    }
-    outputs = {}
-    field = fields.IntegerField(min_value=1, max_value=3)
-
-
-class TestFloatField(FieldValues):
-    """
-    Valid and invalid values for `FloatField`.
-    """
-    valid_inputs = {
-        '1': 1.0,
-        '0': 0.0,
-        1: 1.0,
-        0: 0.0,
-        1.0: 1.0,
-        0.0: 0.0,
-    }
-    invalid_inputs = {
-        'abc': ["A valid number is required."]
-    }
-    outputs = {
-        '1': 1.0,
-        '0': 0.0,
-        1: 1.0,
-        0: 0.0,
-        1.0: 1.0,
-        0.0: 0.0,
-    }
-    field = fields.FloatField()
-
-
-class TestMinMaxFloatField(FieldValues):
-    """
-    Valid and invalid values for `FloatField` with min and max limits.
-    """
-    valid_inputs = {
-        '1': 1,
-        '3': 3,
-        1: 1,
-        3: 3,
-        1.0: 1.0,
-        3.0: 3.0,
-    }
-    invalid_inputs = {
-        0.9: ['Ensure this value is greater than or equal to 1.'],
-        3.1: ['Ensure this value is less than or equal to 3.'],
-        '0.0': ['Ensure this value is greater than or equal to 1.'],
-        '3.1': ['Ensure this value is less than or equal to 3.'],
-    }
-    outputs = {}
-    field = fields.FloatField(min_value=1, max_value=3)
-
-
-class TestDecimalField(FieldValues):
-    """
-    Valid and invalid values for `DecimalField`.
-    """
-    valid_inputs = {
-        '12.3': Decimal('12.3'),
-        '0.1': Decimal('0.1'),
-        10: Decimal('10'),
-        0: Decimal('0'),
-        12.3: Decimal('12.3'),
-        0.1: Decimal('0.1'),
-    }
-    invalid_inputs = (
-        ('abc', ["A valid number is required."]),
-        (Decimal('Nan'), ["A valid number is required."]),
-        (Decimal('Inf'), ["A valid number is required."]),
-        ('12.345', ["Ensure that there are no more than 3 digits in total."]),
-        ('0.01', ["Ensure that there are no more than 1 decimal places."]),
-        (123, ["Ensure that there are no more than 2 digits before the decimal point."])
-    )
-    outputs = {
-        '1': '1.0',
-        '0': '0.0',
-        '1.09': '1.1',
-        '0.04': '0.0',
-        1: '1.0',
-        0: '0.0',
-        Decimal('1.0'): '1.0',
-        Decimal('0.0'): '0.0',
-        Decimal('1.09'): '1.1',
-        Decimal('0.04'): '0.0',
-    }
-    field = fields.DecimalField(max_digits=3, decimal_places=1)
-
-
-class TestMinMaxDecimalField(FieldValues):
-    """
-    Valid and invalid values for `DecimalField` with min and max limits.
-    """
-    valid_inputs = {
-        '10.0': Decimal('10.0'),
-        '20.0': Decimal('20.0'),
-    }
-    invalid_inputs = {
-        '9.9': ['Ensure this value is greater than or equal to 10.'],
-        '20.1': ['Ensure this value is less than or equal to 20.'],
-    }
-    outputs = {}
-    field = fields.DecimalField(
-        max_digits=3, decimal_places=1,
-        min_value=10, max_value=20
-    )
-
-
-class TestNoStringCoercionDecimalField(FieldValues):
-    """
-    Output values for `DecimalField` with `coerce_to_string=False`.
-    """
-    valid_inputs = {}
-    invalid_inputs = {}
-    outputs = {
-        1.09: Decimal('1.1'),
-        0.04: Decimal('0.0'),
-        '1.09': Decimal('1.1'),
-        '0.04': Decimal('0.0'),
-        Decimal('1.09'): Decimal('1.1'),
-        Decimal('0.04'): Decimal('0.0'),
-    }
-    field = fields.DecimalField(
-        max_digits=3, decimal_places=1,
-        coerce_to_string=False
-    )
-
-
-# Date & time fields...
-
-class TestDateField(FieldValues):
-    """
-    Valid and invalid values for `DateField`.
-    """
-    valid_inputs = {
-        '2001-01-01': datetime.date(2001, 1, 1),
-        datetime.date(2001, 1, 1): datetime.date(2001, 1, 1),
-    }
-    invalid_inputs = {
-        'abc': ['Date has wrong format. Use one of these formats instead: YYYY[-MM[-DD]]'],
-        '2001-99-99': ['Date has wrong format. Use one of these formats instead: YYYY[-MM[-DD]]'],
-        datetime.datetime(2001, 1, 1, 12, 00): ['Expected a date but got a datetime.'],
-    }
-    outputs = {
-        datetime.date(2001, 1, 1): '2001-01-01',
-    }
-    field = fields.DateField()
-
-
-class TestCustomInputFormatDateField(FieldValues):
-    """
-    Valid and invalid values for `DateField` with a cutom input format.
-    """
-    valid_inputs = {
-        '1 Jan 2001': datetime.date(2001, 1, 1),
-    }
-    invalid_inputs = {
-        '2001-01-01': ['Date has wrong format. Use one of these formats instead: DD [Jan-Dec] YYYY']
-    }
-    outputs = {}
-    field = fields.DateField(input_formats=['%d %b %Y'])
-
-
-class TestCustomOutputFormatDateField(FieldValues):
-    """
-    Values for `DateField` with a custom output format.
-    """
-    valid_inputs = {}
-    invalid_inputs = {}
-    outputs = {
-        datetime.date(2001, 1, 1): '01 Jan 2001'
-    }
-    field = fields.DateField(format='%d %b %Y')
-
-
-class TestNoOutputFormatDateField(FieldValues):
-    """
-    Values for `DateField` with no output format.
-    """
-    valid_inputs = {}
-    invalid_inputs = {}
-    outputs = {
-        datetime.date(2001, 1, 1): datetime.date(2001, 1, 1)
-    }
-    field = fields.DateField(format=None)
-
-
-class TestDateTimeField(FieldValues):
-    """
-    Valid and invalid values for `DateTimeField`.
-    """
-    valid_inputs = {
-        '2001-01-01 13:00': datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()),
-        '2001-01-01T13:00': datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()),
-        '2001-01-01T13:00Z': datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()),
-        datetime.datetime(2001, 1, 1, 13, 00): datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()),
-        datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()): datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()),
-        # Note that 1.4 does not support timezone string parsing.
-        '2001-01-01T14:00+01:00' if (django.VERSION > (1, 4)) else '2001-01-01T13:00Z': datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC())
-    }
-    invalid_inputs = {
-        'abc': ['Datetime has wrong format. Use one of these formats instead: YYYY-MM-DDThh:mm[:ss[.uuuuuu]][+HH:MM|-HH:MM|Z]'],
-        '2001-99-99T99:00': ['Datetime has wrong format. Use one of these formats instead: YYYY-MM-DDThh:mm[:ss[.uuuuuu]][+HH:MM|-HH:MM|Z]'],
-        datetime.date(2001, 1, 1): ['Expected a datetime but got a date.'],
-    }
-    outputs = {
-        datetime.datetime(2001, 1, 1, 13, 00): '2001-01-01T13:00:00',
-        datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()): '2001-01-01T13:00:00Z',
-    }
-    field = fields.DateTimeField(default_timezone=timezone.UTC())
-
-
-class TestCustomInputFormatDateTimeField(FieldValues):
-    """
-    Valid and invalid values for `DateTimeField` with a cutom input format.
-    """
-    valid_inputs = {
-        '1:35pm, 1 Jan 2001': datetime.datetime(2001, 1, 1, 13, 35, tzinfo=timezone.UTC()),
-    }
-    invalid_inputs = {
-        '2001-01-01T20:50': ['Datetime has wrong format. Use one of these formats instead: hh:mm[AM|PM], DD [Jan-Dec] YYYY']
-    }
-    outputs = {}
-    field = fields.DateTimeField(default_timezone=timezone.UTC(), input_formats=['%I:%M%p, %d %b %Y'])
-
-
-class TestCustomOutputFormatDateTimeField(FieldValues):
-    """
-    Values for `DateTimeField` with a custom output format.
-    """
-    valid_inputs = {}
-    invalid_inputs = {}
-    outputs = {
-        datetime.datetime(2001, 1, 1, 13, 00): '01:00PM, 01 Jan 2001',
-    }
-    field = fields.DateTimeField(format='%I:%M%p, %d %b %Y')
-
-
-class TestNoOutputFormatDateTimeField(FieldValues):
-    """
-    Values for `DateTimeField` with no output format.
-    """
-    valid_inputs = {}
-    invalid_inputs = {}
-    outputs = {
-        datetime.datetime(2001, 1, 1, 13, 00): datetime.datetime(2001, 1, 1, 13, 00),
-    }
-    field = fields.DateTimeField(format=None)
-
-
-class TestNaiveDateTimeField(FieldValues):
-    """
-    Valid and invalid values for `DateTimeField` with naive datetimes.
-    """
-    valid_inputs = {
-        datetime.datetime(2001, 1, 1, 13, 00, tzinfo=timezone.UTC()): datetime.datetime(2001, 1, 1, 13, 00),
-        '2001-01-01 13:00': datetime.datetime(2001, 1, 1, 13, 00),
-    }
-    invalid_inputs = {}
-    outputs = {}
-    field = fields.DateTimeField(default_timezone=None)
-
-
-class TestTimeField(FieldValues):
-    """
-    Valid and invalid values for `TimeField`.
-    """
-    valid_inputs = {
-        '13:00': datetime.time(13, 00),
-        datetime.time(13, 00): datetime.time(13, 00),
-    }
-    invalid_inputs = {
-        'abc': ['Time has wrong format. Use one of these formats instead: hh:mm[:ss[.uuuuuu]]'],
-        '99:99': ['Time has wrong format. Use one of these formats instead: hh:mm[:ss[.uuuuuu]]'],
-    }
-    outputs = {
-        datetime.time(13, 00): '13:00:00'
-    }
-    field = fields.TimeField()
-
-
-class TestCustomInputFormatTimeField(FieldValues):
-    """
-    Valid and invalid values for `TimeField` with a custom input format.
-    """
-    valid_inputs = {
-        '1:00pm': datetime.time(13, 00),
-    }
-    invalid_inputs = {
-        '13:00': ['Time has wrong format. Use one of these formats instead: hh:mm[AM|PM]'],
-    }
-    outputs = {}
-    field = fields.TimeField(input_formats=['%I:%M%p'])
-
-
-class TestCustomOutputFormatTimeField(FieldValues):
-    """
-    Values for `TimeField` with a custom output format.
-    """
-    valid_inputs = {}
-    invalid_inputs = {}
-    outputs = {
-        datetime.time(13, 00): '01:00PM'
-    }
-    field = fields.TimeField(format='%I:%M%p')
-
-
-class TestNoOutputFormatTimeField(FieldValues):
-    """
-    Values for `TimeField` with a no output format.
-    """
-    valid_inputs = {}
-    invalid_inputs = {}
-    outputs = {
-        datetime.time(13, 00): datetime.time(13, 00)
-    }
-    field = fields.TimeField(format=None)
-
-
-# Choice types...
-
-class TestChoiceField(FieldValues):
-    """
-    Valid and invalid values for `ChoiceField`.
-    """
-    valid_inputs = {
-        'poor': 'poor',
-        'medium': 'medium',
-        'good': 'good',
-    }
-    invalid_inputs = {
-        'amazing': ['`amazing` is not a valid choice.']
-    }
-    outputs = {
-        'good': 'good'
-    }
-    field = fields.ChoiceField(
-        choices=[
-            ('poor', 'Poor quality'),
-            ('medium', 'Medium quality'),
-            ('good', 'Good quality'),
-        ]
-    )
-
-
-class TestChoiceFieldWithType(FieldValues):
-    """
-    Valid and invalid values for a `Choice` field that uses an integer type,
-    instead of a char type.
-    """
-    valid_inputs = {
-        '1': 1,
-        3: 3,
-    }
-    invalid_inputs = {
-        5: ['`5` is not a valid choice.'],
-        'abc': ['`abc` is not a valid choice.']
-    }
-    outputs = {
-        '1': 1,
-        1: 1
-    }
-    field = fields.ChoiceField(
-        choices=[
-            (1, 'Poor quality'),
-            (2, 'Medium quality'),
-            (3, 'Good quality'),
-        ]
-    )
-
-
-class TestChoiceFieldWithListChoices(FieldValues):
-    """
-    Valid and invalid values for a `Choice` field that uses a flat list for the
-    choices, rather than a list of pairs of (`value`, `description`).
-    """
-    valid_inputs = {
-        'poor': 'poor',
-        'medium': 'medium',
-        'good': 'good',
-    }
-    invalid_inputs = {
-        'awful': ['`awful` is not a valid choice.']
-    }
-    outputs = {
-        'good': 'good'
-    }
-    field = fields.ChoiceField(choices=('poor', 'medium', 'good'))
-
-
-class TestMultipleChoiceField(FieldValues):
-    """
-    Valid and invalid values for `MultipleChoiceField`.
-    """
-    valid_inputs = {
-        (): set(),
-        ('aircon',): set(['aircon']),
-        ('aircon', 'manual'): set(['aircon', 'manual']),
-    }
-    invalid_inputs = {
-        'abc': ['Expected a list of items but got type `str`'],
-        ('aircon', 'incorrect'): ['`incorrect` is not a valid choice.']
-    }
-    outputs = [
-        (['aircon', 'manual'], set(['aircon', 'manual']))
-    ]
-    field = fields.MultipleChoiceField(
-        choices=[
-            ('aircon', 'AirCon'),
-            ('manual', 'Manual drive'),
-            ('diesel', 'Diesel'),
-        ]
-    )
-
-
-# """
-# General serializer field tests.
-# """
-# from __future__ import unicode_literals
-
-# import datetime
-# import re
-# from decimal import Decimal
-# from uuid import uuid4
-# from django.core import validators
-# from django.db import models
-# from django.test import TestCase
-# from django.utils.datastructures import SortedDict
-# from rest_framework import serializers
-# from tests.models import RESTFrameworkModel
-
-
-# class TimestampedModel(models.Model):
-#     added = models.DateTimeField(auto_now_add=True)
-#     updated = models.DateTimeField(auto_now=True)
-
-
-# class CharPrimaryKeyModel(models.Model):
-#     id = models.CharField(max_length=20, primary_key=True)
-
-
-# class TimestampedModelSerializer(serializers.ModelSerializer):
-#     class Meta:
-#         model = TimestampedModel
-
-
-# class CharPrimaryKeyModelSerializer(serializers.ModelSerializer):
-#     class Meta:
-#         model = CharPrimaryKeyModel
-
-
-# class TimeFieldModel(models.Model):
-#     clock = models.TimeField()
-
-
-# class TimeFieldModelSerializer(serializers.ModelSerializer):
-#     class Meta:
-#         model = TimeFieldModel
-
-
-# SAMPLE_CHOICES = [
-#     ('red', 'Red'),
-#     ('green', 'Green'),
-#     ('blue', 'Blue'),
-# ]
-
-
-# class ChoiceFieldModel(models.Model):
-#     choice = models.CharField(choices=SAMPLE_CHOICES, blank=True, max_length=255)
-
-
-# class ChoiceFieldModelSerializer(serializers.ModelSerializer):
-#     class Meta:
-#         model = ChoiceFieldModel
-
-
-# class ChoiceFieldModelWithNull(models.Model):
-#     choice = models.CharField(choices=SAMPLE_CHOICES, blank=True, null=True, max_length=255)
-
-
-# class ChoiceFieldModelWithNullSerializer(serializers.ModelSerializer):
-#     class Meta:
-#         model = ChoiceFieldModelWithNull
-
-
-# class BasicFieldTests(TestCase):
-#     def test_auto_now_fields_read_only(self):
-#         """
-#         auto_now and auto_now_add fields should be read_only by default.
-#         """
-#         serializer = TimestampedModelSerializer()
-#         self.assertEqual(serializer.fields['added'].read_only, True)
-
-#     def test_auto_pk_fields_read_only(self):
-#         """
-#         AutoField fields should be read_only by default.
-#         """
-#         serializer = TimestampedModelSerializer()
-#         self.assertEqual(serializer.fields['id'].read_only, True)
-
-#     def test_non_auto_pk_fields_not_read_only(self):
-#         """
-#         PK fields other than AutoField fields should not be read_only by default.
-#         """
-#         serializer = CharPrimaryKeyModelSerializer()
-#         self.assertEqual(serializer.fields['id'].read_only, False)
-
-#     def test_dict_field_ordering(self):
-#         """
-#         Field should preserve dictionary ordering, if it exists.
-#         See: https://github.com/tomchristie/django-rest-framework/issues/832
-#         """
-#         ret = SortedDict()
-#         ret['c'] = 1
-#         ret['b'] = 1
-#         ret['a'] = 1
-#         ret['z'] = 1
-#         field = serializers.Field()
-#         keys = list(field.to_native(ret).keys())
-#         self.assertEqual(keys, ['c', 'b', 'a', 'z'])
-
-#     def test_widget_html_attributes(self):
-#         """
-#         Make sure widget_html() renders the correct attributes
-#         """
-#         r = re.compile('(\S+)=["\']?((?:.(?!["\']?\s+(?:\S+)=|[>"\']))+.)["\']?')
-#         form = TimeFieldModelSerializer().data
-#         attributes = r.findall(form.fields['clock'].widget_html())
-#         self.assertIn(('name', 'clock'), attributes)
-#         self.assertIn(('id', 'clock'), attributes)
-
-
-# class DateFieldTest(TestCase):
-#     """
-#     Tests for the DateFieldTest from_native() and to_native() behavior
-#     """
-
-#     def test_from_native_string(self):
-#         """
-#         Make sure from_native() accepts default iso input formats.
-#         """
-#         f = serializers.DateField()
-#         result_1 = f.from_native('1984-07-31')
-
-#         self.assertEqual(datetime.date(1984, 7, 31), result_1)
-
-#     def test_from_native_datetime_date(self):
-#         """
-#         Make sure from_native() accepts a datetime.date instance.
-#         """
-#         f = serializers.DateField()
-#         result_1 = f.from_native(datetime.date(1984, 7, 31))
-
-#         self.assertEqual(result_1, datetime.date(1984, 7, 31))
-
-#     def test_from_native_custom_format(self):
-#         """
-#         Make sure from_native() accepts custom input formats.
-#         """
-#         f = serializers.DateField(input_formats=['%Y -- %d'])
-#         result = f.from_native('1984 -- 31')
-
-#         self.assertEqual(datetime.date(1984, 1, 31), result)
-
-#     def test_from_native_invalid_default_on_custom_format(self):
-#         """
-#         Make sure from_native() don't accept default formats if custom format is preset
-#         """
-#         f = serializers.DateField(input_formats=['%Y -- %d'])
-
-#         try:
-#             f.from_native('1984-07-31')
-#         except validators.ValidationError as e:
-#             self.assertEqual(e.messages, ["Date has wrong format. Use one of these formats instead: YYYY -- DD"])
-#         else:
-#             self.fail("ValidationError was not properly raised")
-
-#     def test_from_native_empty(self):
-#         """
-#         Make sure from_native() returns None on empty param.
-#         """
-#         f = serializers.DateField()
-#         result = f.from_native('')
-
-#         self.assertEqual(result, None)
-
-#     def test_from_native_none(self):
-#         """
-#         Make sure from_native() returns None on None param.
-#         """
-#         f = serializers.DateField()
-#         result = f.from_native(None)
-
-#         self.assertEqual(result, None)
-
-#     def test_from_native_invalid_date(self):
-#         """
-#         Make sure from_native() raises a ValidationError on passing an invalid date.
-#         """
-#         f = serializers.DateField()
-
-#         try:
-#             f.from_native('1984-13-31')
-#         except validators.ValidationError as e:
-#             self.assertEqual(e.messages, ["Date has wrong format. Use one of these formats instead: YYYY[-MM[-DD]]"])
-#         else:
-#             self.fail("ValidationError was not properly raised")
-
-#     def test_from_native_invalid_format(self):
-#         """
-#         Make sure from_native() raises a ValidationError on passing an invalid format.
-#         """
-#         f = serializers.DateField()
-
-#         try:
-#             f.from_native('1984 -- 31')
-#         except validators.ValidationError as e:
-#             self.assertEqual(e.messages, ["Date has wrong format. Use one of these formats instead: YYYY[-MM[-DD]]"])
-#         else:
-#             self.fail("ValidationError was not properly raised")
-
-#     def test_to_native(self):
-#         """
-#         Make sure to_native() returns datetime as default.
-#         """
-#         f = serializers.DateField()
-
-#         result_1 = f.to_native(datetime.date(1984, 7, 31))
-
-#         self.assertEqual(datetime.date(1984, 7, 31), result_1)
-
-#     def test_to_native_iso(self):
-#         """
-#         Make sure to_native() with 'iso-8601' returns iso formated date.
-#         """
-#         f = serializers.DateField(format='iso-8601')
-
-#         result_1 = f.to_native(datetime.date(1984, 7, 31))
-
-#         self.assertEqual('1984-07-31', result_1)
-
-#     def test_to_native_custom_format(self):
-#         """
-#         Make sure to_native() returns correct custom format.
-#         """
-#         f = serializers.DateField(format="%Y - %m.%d")
-
-#         result_1 = f.to_native(datetime.date(1984, 7, 31))
-
-#         self.assertEqual('1984 - 07.31', result_1)
-
-#     def test_to_native_none(self):
-#         """
-#         Make sure from_native() returns None on None param.
-#         """
-#         f = serializers.DateField(required=False)
-#         self.assertEqual(None, f.to_native(None))
-
-
-# class DateTimeFieldTest(TestCase):
-#     """
-#     Tests for the DateTimeField from_native() and to_native() behavior
-#     """
-
-#     def test_from_native_string(self):
-#         """
-#         Make sure from_native() accepts default iso input formats.
-#         """
-#         f = serializers.DateTimeField()
-#         result_1 = f.from_native('1984-07-31 04:31')
-#         result_2 = f.from_native('1984-07-31 04:31:59')
-#         result_3 = f.from_native('1984-07-31 04:31:59.000200')
-
-#         self.assertEqual(datetime.datetime(1984, 7, 31, 4, 31), result_1)
-#         self.assertEqual(datetime.datetime(1984, 7, 31, 4, 31, 59), result_2)
-#         self.assertEqual(datetime.datetime(1984, 7, 31, 4, 31, 59, 200), result_3)
-
-#     def test_from_native_datetime_datetime(self):
-#         """
-#         Make sure from_native() accepts a datetime.datetime instance.
-#         """
-#         f = serializers.DateTimeField()
-#         result_1 = f.from_native(datetime.datetime(1984, 7, 31, 4, 31))
-#         result_2 = f.from_native(datetime.datetime(1984, 7, 31, 4, 31, 59))
-#         result_3 = f.from_native(datetime.datetime(1984, 7, 31, 4, 31, 59, 200))
-
-#         self.assertEqual(result_1, datetime.datetime(1984, 7, 31, 4, 31))
-#         self.assertEqual(result_2, datetime.datetime(1984, 7, 31, 4, 31, 59))
-#         self.assertEqual(result_3, datetime.datetime(1984, 7, 31, 4, 31, 59, 200))
-
-#     def test_from_native_custom_format(self):
-#         """
-#         Make sure from_native() accepts custom input formats.
-#         """
-#         f = serializers.DateTimeField(input_formats=['%Y -- %H:%M'])
-#         result = f.from_native('1984 -- 04:59')
-
-#         self.assertEqual(datetime.datetime(1984, 1, 1, 4, 59), result)
-
-#     def test_from_native_invalid_default_on_custom_format(self):
-#         """
-#         Make sure from_native() don't accept default formats if custom format is preset
-#         """
-#         f = serializers.DateTimeField(input_formats=['%Y -- %H:%M'])
-
-#         try:
-#             f.from_native('1984-07-31 04:31:59')
-#         except validators.ValidationError as e:
-#             self.assertEqual(e.messages, ["Datetime has wrong format. Use one of these formats instead: YYYY -- hh:mm"])
-#         else:
-#             self.fail("ValidationError was not properly raised")
-
-#     def test_from_native_empty(self):
-#         """
-#         Make sure from_native() returns None on empty param.
-#         """
-#         f = serializers.DateTimeField()
-#         result = f.from_native('')
-
-#         self.assertEqual(result, None)
-
-#     def test_from_native_none(self):
-#         """
-#         Make sure from_native() returns None on None param.
-#         """
-#         f = serializers.DateTimeField()
-#         result = f.from_native(None)
-
-#         self.assertEqual(result, None)
-
-#     def test_from_native_invalid_datetime(self):
-#         """
-#         Make sure from_native() raises a ValidationError on passing an invalid datetime.
-#         """
-#         f = serializers.DateTimeField()
-
-#         try:
-#             f.from_native('04:61:59')
-#         except validators.ValidationError as e:
-#             self.assertEqual(e.messages, ["Datetime has wrong format. Use one of these formats instead: "
-#                                           "YYYY-MM-DDThh:mm[:ss[.uuuuuu]][+HH:MM|-HH:MM|Z]"])
-#         else:
-#             self.fail("ValidationError was not properly raised")
-
-#     def test_from_native_invalid_format(self):
-#         """
-#         Make sure from_native() raises a ValidationError on passing an invalid format.
-#         """
-#         f = serializers.DateTimeField()
-
-#         try:
-#             f.from_native('04 -- 31')
-#         except validators.ValidationError as e:
-#             self.assertEqual(e.messages, ["Datetime has wrong format. Use one of these formats instead: "
-#                                           "YYYY-MM-DDThh:mm[:ss[.uuuuuu]][+HH:MM|-HH:MM|Z]"])
-#         else:
-#             self.fail("ValidationError was not properly raised")
-
-#     def test_to_native(self):
-#         """
-#         Make sure to_native() returns isoformat as default.
-#         """
-#         f = serializers.DateTimeField()
-
-#         result_1 = f.to_native(datetime.datetime(1984, 7, 31))
-#         result_2 = f.to_native(datetime.datetime(1984, 7, 31, 4, 31))
-#         result_3 = f.to_native(datetime.datetime(1984, 7, 31, 4, 31, 59))
-#         result_4 = f.to_native(datetime.datetime(1984, 7, 31, 4, 31, 59, 200))
-
-#         self.assertEqual(datetime.datetime(1984, 7, 31), result_1)
-#         self.assertEqual(datetime.datetime(1984, 7, 31, 4, 31), result_2)
-#         self.assertEqual(datetime.datetime(1984, 7, 31, 4, 31, 59), result_3)
-#         self.assertEqual(datetime.datetime(1984, 7, 31, 4, 31, 59, 200), result_4)
-
-#     def test_to_native_iso(self):
-#         """
-#         Make sure to_native() with format=iso-8601 returns iso formatted datetime.
-#         """
-#         f = serializers.DateTimeField(format='iso-8601')
-
-#         result_1 = f.to_native(datetime.datetime(1984, 7, 31))
-#         result_2 = f.to_native(datetime.datetime(1984, 7, 31, 4, 31))
-#         result_3 = f.to_native(datetime.datetime(1984, 7, 31, 4, 31, 59))
-#         result_4 = f.to_native(datetime.datetime(1984, 7, 31, 4, 31, 59, 200))
-
-#         self.assertEqual('1984-07-31T00:00:00', result_1)
-#         self.assertEqual('1984-07-31T04:31:00', result_2)
-#         self.assertEqual('1984-07-31T04:31:59', result_3)
-#         self.assertEqual('1984-07-31T04:31:59.000200', result_4)
-
-#     def test_to_native_custom_format(self):
-#         """
-#         Make sure to_native() returns correct custom format.
-#         """
-#         f = serializers.DateTimeField(format="%Y - %H:%M")
-
-#         result_1 = f.to_native(datetime.datetime(1984, 7, 31))
-#         result_2 = f.to_native(datetime.datetime(1984, 7, 31, 4, 31))
-#         result_3 = f.to_native(datetime.datetime(1984, 7, 31, 4, 31, 59))
-#         result_4 = f.to_native(datetime.datetime(1984, 7, 31, 4, 31, 59, 200))
-
-#         self.assertEqual('1984 - 00:00', result_1)
-#         self.assertEqual('1984 - 04:31', result_2)
-#         self.assertEqual('1984 - 04:31', result_3)
-#         self.assertEqual('1984 - 04:31', result_4)
-
-#     def test_to_native_none(self):
-#         """
-#         Make sure from_native() returns None on None param.
-#         """
-#         f = serializers.DateTimeField(required=False)
-#         self.assertEqual(None, f.to_native(None))
-
-
-# class TimeFieldTest(TestCase):
-#     """
-#     Tests for the TimeField from_native() and to_native() behavior
-#     """
-
-#     def test_from_native_string(self):
-#         """
-#         Make sure from_native() accepts default iso input formats.
-#         """
-#         f = serializers.TimeField()
-#         result_1 = f.from_native('04:31')
-#         result_2 = f.from_native('04:31:59')
-#         result_3 = f.from_native('04:31:59.000200')
-
-#         self.assertEqual(datetime.time(4, 31), result_1)
-#         self.assertEqual(datetime.time(4, 31, 59), result_2)
-#         self.assertEqual(datetime.time(4, 31, 59, 200), result_3)
-
-#     def test_from_native_datetime_time(self):
-#         """
-#         Make sure from_native() accepts a datetime.time instance.
-#         """
-#         f = serializers.TimeField()
-#         result_1 = f.from_native(datetime.time(4, 31))
-#         result_2 = f.from_native(datetime.time(4, 31, 59))
-#         result_3 = f.from_native(datetime.time(4, 31, 59, 200))
-
-#         self.assertEqual(result_1, datetime.time(4, 31))
-#         self.assertEqual(result_2, datetime.time(4, 31, 59))
-#         self.assertEqual(result_3, datetime.time(4, 31, 59, 200))
-
-#     def test_from_native_custom_format(self):
-#         """
-#         Make sure from_native() accepts custom input formats.
-#         """
-#         f = serializers.TimeField(input_formats=['%H -- %M'])
-#         result = f.from_native('04 -- 31')
-
-#         self.assertEqual(datetime.time(4, 31), result)
-
-#     def test_from_native_invalid_default_on_custom_format(self):
-#         """
-#         Make sure from_native() don't accept default formats if custom format is preset
-#         """
-#         f = serializers.TimeField(input_formats=['%H -- %M'])
-
-#         try:
-#             f.from_native('04:31:59')
-#         except validators.ValidationError as e:
-#             self.assertEqual(e.messages, ["Time has wrong format. Use one of these formats instead: hh -- mm"])
-#         else:
-#             self.fail("ValidationError was not properly raised")
-
-#     def test_from_native_empty(self):
-#         """
-#         Make sure from_native() returns None on empty param.
-#         """
-#         f = serializers.TimeField()
-#         result = f.from_native('')
-
-#         self.assertEqual(result, None)
-
-#     def test_from_native_none(self):
-#         """
-#         Make sure from_native() returns None on None param.
-#         """
-#         f = serializers.TimeField()
-#         result = f.from_native(None)
-
-#         self.assertEqual(result, None)
-
-#     def test_from_native_invalid_time(self):
-#         """
-#         Make sure from_native() raises a ValidationError on passing an invalid time.
-#         """
-#         f = serializers.TimeField()
-
-#         try:
-#             f.from_native('04:61:59')
-#         except validators.ValidationError as e:
-#             self.assertEqual(e.messages, ["Time has wrong format. Use one of these formats instead: "
-#                                           "hh:mm[:ss[.uuuuuu]]"])
-#         else:
-#             self.fail("ValidationError was not properly raised")
-
-#     def test_from_native_invalid_format(self):
-#         """
-#         Make sure from_native() raises a ValidationError on passing an invalid format.
-#         """
-#         f = serializers.TimeField()
-
-#         try:
-#             f.from_native('04 -- 31')
-#         except validators.ValidationError as e:
-#             self.assertEqual(e.messages, ["Time has wrong format. Use one of these formats instead: "
-#                                           "hh:mm[:ss[.uuuuuu]]"])
-#         else:
-#             self.fail("ValidationError was not properly raised")
-
-#     def test_to_native(self):
-#         """
-#         Make sure to_native() returns time object as default.
-#         """
-#         f = serializers.TimeField()
-#         result_1 = f.to_native(datetime.time(4, 31))
-#         result_2 = f.to_native(datetime.time(4, 31, 59))
-#         result_3 = f.to_native(datetime.time(4, 31, 59, 200))
-
-#         self.assertEqual(datetime.time(4, 31), result_1)
-#         self.assertEqual(datetime.time(4, 31, 59), result_2)
-#         self.assertEqual(datetime.time(4, 31, 59, 200), result_3)
-
-#     def test_to_native_iso(self):
-#         """
-#         Make sure to_native() with format='iso-8601' returns iso formatted time.
-#         """
-#         f = serializers.TimeField(format='iso-8601')
-#         result_1 = f.to_native(datetime.time(4, 31))
-#         result_2 = f.to_native(datetime.time(4, 31, 59))
-#         result_3 = f.to_native(datetime.time(4, 31, 59, 200))
-
-#         self.assertEqual('04:31:00', result_1)
-#         self.assertEqual('04:31:59', result_2)
-#         self.assertEqual('04:31:59.000200', result_3)
-
-#     def test_to_native_custom_format(self):
-#         """
-#         Make sure to_native() returns correct custom format.
-#         """
-#         f = serializers.TimeField(format="%H - %S [%f]")
-#         result_1 = f.to_native(datetime.time(4, 31))
-#         result_2 = f.to_native(datetime.time(4, 31, 59))
-#         result_3 = f.to_native(datetime.time(4, 31, 59, 200))
-
-#         self.assertEqual('04 - 00 [000000]', result_1)
-#         self.assertEqual('04 - 59 [000000]', result_2)
-#         self.assertEqual('04 - 59 [000200]', result_3)
-
-
-# class DecimalFieldTest(TestCase):
-#     """
-#     Tests for the DecimalField from_native() and to_native() behavior
-#     """
-
-#     def test_from_native_string(self):
-#         """
-#         Make sure from_native() accepts string values
-#         """
-#         f = serializers.DecimalField()
-#         result_1 = f.from_native('9000')
-#         result_2 = f.from_native('1.00000001')
-
-#         self.assertEqual(Decimal('9000'), result_1)
-#         self.assertEqual(Decimal('1.00000001'), result_2)
-
-#     def test_from_native_invalid_string(self):
-#         """
-#         Make sure from_native() raises ValidationError on passing invalid string
-#         """
-#         f = serializers.DecimalField()
-
-#         try:
-#             f.from_native('123.45.6')
-#         except validators.ValidationError as e:
-#             self.assertEqual(e.messages, ["Enter a number."])
-#         else:
-#             self.fail("ValidationError was not properly raised")
-
-#     def test_from_native_integer(self):
-#         """
-#         Make sure from_native() accepts integer values
-#         """
-#         f = serializers.DecimalField()
-#         result = f.from_native(9000)
-
-#         self.assertEqual(Decimal('9000'), result)
-
-#     def test_from_native_float(self):
-#         """
-#         Make sure from_native() accepts float values
-#         """
-#         f = serializers.DecimalField()
-#         result = f.from_native(1.00000001)
-
-#         self.assertEqual(Decimal('1.00000001'), result)
-
-#     def test_from_native_empty(self):
-#         """
-#         Make sure from_native() returns None on empty param.
-#         """
-#         f = serializers.DecimalField()
-#         result = f.from_native('')
-
-#         self.assertEqual(result, None)
-
-#     def test_from_native_none(self):
-#         """
-#         Make sure from_native() returns None on None param.
-#         """
-#         f = serializers.DecimalField()
-#         result = f.from_native(None)
-
-#         self.assertEqual(result, None)
-
-#     def test_to_native(self):
-#         """
-#         Make sure to_native() returns Decimal as string.
-#         """
-#         f = serializers.DecimalField()
-
-#         result_1 = f.to_native(Decimal('9000'))
-#         result_2 = f.to_native(Decimal('1.00000001'))
-
-#         self.assertEqual(Decimal('9000'), result_1)
-#         self.assertEqual(Decimal('1.00000001'), result_2)
-
-#     def test_to_native_none(self):
-#         """
-#         Make sure from_native() returns None on None param.
-#         """
-#         f = serializers.DecimalField(required=False)
-#         self.assertEqual(None, f.to_native(None))
-
-#     def test_valid_serialization(self):
-#         """
-#         Make sure the serializer works correctly
-#         """
-#         class DecimalSerializer(serializers.Serializer):
-#             decimal_field = serializers.DecimalField(max_value=9010,
-#                                                      min_value=9000,
-#                                                      max_digits=6,
-#                                                      decimal_places=2)
-
-#         self.assertTrue(DecimalSerializer(data={'decimal_field': '9001'}).is_valid())
-#         self.assertTrue(DecimalSerializer(data={'decimal_field': '9001.2'}).is_valid())
-#         self.assertTrue(DecimalSerializer(data={'decimal_field': '9001.23'}).is_valid())
-
-#         self.assertFalse(DecimalSerializer(data={'decimal_field': '8000'}).is_valid())
-#         self.assertFalse(DecimalSerializer(data={'decimal_field': '9900'}).is_valid())
-#         self.assertFalse(DecimalSerializer(data={'decimal_field': '9001.234'}).is_valid())
-
-#     def test_raise_max_value(self):
-#         """
-#         Make sure max_value violations raises ValidationError
-#         """
-#         class DecimalSerializer(serializers.Serializer):
-#             decimal_field = serializers.DecimalField(max_value=100)
-
-#         s = DecimalSerializer(data={'decimal_field': '123'})
-
-#         self.assertFalse(s.is_valid())
-#         self.assertEqual(s.errors, {'decimal_field': ['Ensure this value is less than or equal to 100.']})
-
-#     def test_raise_min_value(self):
-#         """
-#         Make sure min_value violations raises ValidationError
-#         """
-#         class DecimalSerializer(serializers.Serializer):
-#             decimal_field = serializers.DecimalField(min_value=100)
-
-#         s = DecimalSerializer(data={'decimal_field': '99'})
-
-#         self.assertFalse(s.is_valid())
-#         self.assertEqual(s.errors, {'decimal_field': ['Ensure this value is greater than or equal to 100.']})
-
-#     def test_raise_max_digits(self):
-#         """
-#         Make sure max_digits violations raises ValidationError
-#         """
-#         class DecimalSerializer(serializers.Serializer):
-#             decimal_field = serializers.DecimalField(max_digits=5)
-
-#         s = DecimalSerializer(data={'decimal_field': '123.456'})
-
-#         self.assertFalse(s.is_valid())
-#         self.assertEqual(s.errors, {'decimal_field': ['Ensure that there are no more than 5 digits in total.']})
-
-#     def test_raise_max_decimal_places(self):
-#         """
-#         Make sure max_decimal_places violations raises ValidationError
-#         """
-#         class DecimalSerializer(serializers.Serializer):
-#             decimal_field = serializers.DecimalField(decimal_places=3)
-
-#         s = DecimalSerializer(data={'decimal_field': '123.4567'})
-
-#         self.assertFalse(s.is_valid())
-#         self.assertEqual(s.errors, {'decimal_field': ['Ensure that there are no more than 3 decimal places.']})
-
-#     def test_raise_max_whole_digits(self):
-#         """
-#         Make sure max_whole_digits violations raises ValidationError
-#         """
-#         class DecimalSerializer(serializers.Serializer):
-#             decimal_field = serializers.DecimalField(max_digits=4, decimal_places=3)
-
-#         s = DecimalSerializer(data={'decimal_field': '12345.6'})
-
-#         self.assertFalse(s.is_valid())
-#         self.assertEqual(s.errors, {'decimal_field': ['Ensure that there are no more than 4 digits in total.']})
-
-
-# class ChoiceFieldTests(TestCase):
-#     """
-#     Tests for the ChoiceField options generator
-#     """
-#     def test_choices_required(self):
-#         """
-#         Make sure proper choices are rendered if field is required
-#         """
-#         f = serializers.ChoiceField(required=True, choices=SAMPLE_CHOICES)
-#         self.assertEqual(f.choices, SAMPLE_CHOICES)
-
-#     def test_choices_not_required(self):
-#         """
-#         Make sure proper choices (plus blank) are rendered if the field isn't required
-#         """
-#         f = serializers.ChoiceField(required=False, choices=SAMPLE_CHOICES)
-#         self.assertEqual(f.choices, models.fields.BLANK_CHOICE_DASH + SAMPLE_CHOICES)
-
-#     def test_blank_choice_display(self):
-#         blank = 'No Preference'
-#         f = serializers.ChoiceField(
-#             required=False,
-#             choices=SAMPLE_CHOICES,
-#             blank_display_value=blank,
-#         )
-#         self.assertEqual(f.choices, [('', blank)] + SAMPLE_CHOICES)
-
-#     def test_invalid_choice_model(self):
-#         s = ChoiceFieldModelSerializer(data={'choice': 'wrong_value'})
-#         self.assertFalse(s.is_valid())
-#         self.assertEqual(s.errors, {'choice': ['Select a valid choice. wrong_value is not one of the available choices.']})
-#         self.assertEqual(s.data['choice'], '')
-
-#     def test_empty_choice_model(self):
-#         """
-#         Test that the 'empty' value is correctly passed and used depending on
-#         the 'null' property on the model field.
-#         """
-#         s = ChoiceFieldModelSerializer(data={'choice': ''})
-#         self.assertTrue(s.is_valid())
-#         self.assertEqual(s.data['choice'], '')
-
-#         s = ChoiceFieldModelWithNullSerializer(data={'choice': ''})
-#         self.assertTrue(s.is_valid())
-#         self.assertEqual(s.data['choice'], None)
-
-#     def test_from_native_empty(self):
-#         """
-#         Make sure from_native() returns an empty string on empty param by default.
-#         """
-#         f = serializers.ChoiceField(choices=SAMPLE_CHOICES)
-#         self.assertEqual(f.from_native(''), '')
-#         self.assertEqual(f.from_native(None), '')
-
-#     def test_from_native_empty_override(self):
-#         """
-#         Make sure you can override from_native() behavior regarding empty values.
-#         """
-#         f = serializers.ChoiceField(choices=SAMPLE_CHOICES, empty=None)
-#         self.assertEqual(f.from_native(''), None)
-#         self.assertEqual(f.from_native(None), None)
-
-#     def test_metadata_choices(self):
-#         """
-#         Make sure proper choices are included in the field's metadata.
-#         """
-#         choices = [{'value': v, 'display_name': n} for v, n in SAMPLE_CHOICES]
-#         f = serializers.ChoiceField(choices=SAMPLE_CHOICES)
-#         self.assertEqual(f.metadata()['choices'], choices)
-
-#     def test_metadata_choices_not_required(self):
-#         """
-#         Make sure proper choices are included in the field's metadata.
-#         """
-#         choices = [{'value': v, 'display_name': n}
-#                    for v, n in models.fields.BLANK_CHOICE_DASH + SAMPLE_CHOICES]
-#         f = serializers.ChoiceField(required=False, choices=SAMPLE_CHOICES)
-#         self.assertEqual(f.metadata()['choices'], choices)
-
-
-# class EmailFieldTests(TestCase):
-#     """
-#     Tests for EmailField attribute values
-#     """
-
-#     class EmailFieldModel(RESTFrameworkModel):
-#         email_field = models.EmailField(blank=True)
-
-#     class EmailFieldWithGivenMaxLengthModel(RESTFrameworkModel):
-#         email_field = models.EmailField(max_length=150, blank=True)
-
-#     def test_default_model_value(self):
-#         class EmailFieldSerializer(serializers.ModelSerializer):
-#             class Meta:
-#                 model = self.EmailFieldModel
-
-#         serializer = EmailFieldSerializer(data={})
-#         self.assertEqual(serializer.is_valid(), True)
-#         self.assertEqual(getattr(serializer.fields['email_field'], 'max_length'), 75)
-
-#     def test_given_model_value(self):
-#         class EmailFieldSerializer(serializers.ModelSerializer):
-#             class Meta:
-#                 model = self.EmailFieldWithGivenMaxLengthModel
-
-#         serializer = EmailFieldSerializer(data={})
-#         self.assertEqual(serializer.is_valid(), True)
-#         self.assertEqual(getattr(serializer.fields['email_field'], 'max_length'), 150)
-
-#     def test_given_serializer_value(self):
-#         class EmailFieldSerializer(serializers.ModelSerializer):
-#             email_field = serializers.EmailField(source='email_field', max_length=20, required=False)
-
-#             class Meta:
-#                 model = self.EmailFieldModel
-
-#         serializer = EmailFieldSerializer(data={})
-#         self.assertEqual(serializer.is_valid(), True)
-#         self.assertEqual(getattr(serializer.fields['email_field'], 'max_length'), 20)
-
-
-# class SlugFieldTests(TestCase):
-#     """
-#     Tests for SlugField attribute values
-#     """
-
-#     class SlugFieldModel(RESTFrameworkModel):
-#         slug_field = models.SlugField(blank=True)
-
-#     class SlugFieldWithGivenMaxLengthModel(RESTFrameworkModel):
-#         slug_field = models.SlugField(max_length=84, blank=True)
-
-#     def test_default_model_value(self):
-#         class SlugFieldSerializer(serializers.ModelSerializer):
-#             class Meta:
-#                 model = self.SlugFieldModel
-
-#         serializer = SlugFieldSerializer(data={})
-#         self.assertEqual(serializer.is_valid(), True)
-#         self.assertEqual(getattr(serializer.fields['slug_field'], 'max_length'), 50)
-
-#     def test_given_model_value(self):
-#         class SlugFieldSerializer(serializers.ModelSerializer):
-#             class Meta:
-#                 model = self.SlugFieldWithGivenMaxLengthModel
-
-#         serializer = SlugFieldSerializer(data={})
-#         self.assertEqual(serializer.is_valid(), True)
-#         self.assertEqual(getattr(serializer.fields['slug_field'], 'max_length'), 84)
-
-#     def test_given_serializer_value(self):
-#         class SlugFieldSerializer(serializers.ModelSerializer):
-#             slug_field = serializers.SlugField(source='slug_field',
-#                                                max_length=20, required=False)
-
-#             class Meta:
-#                 model = self.SlugFieldModel
-
-#         serializer = SlugFieldSerializer(data={})
-#         self.assertEqual(serializer.is_valid(), True)
-#         self.assertEqual(getattr(serializer.fields['slug_field'],
-#                                  'max_length'), 20)
-
-#     def test_invalid_slug(self):
-#         """
-#         Make sure an invalid slug raises ValidationError
-#         """
-#         class SlugFieldSerializer(serializers.ModelSerializer):
-#             slug_field = serializers.SlugField(source='slug_field', max_length=20, required=True)
-
-#             class Meta:
-#                 model = self.SlugFieldModel
-
-#         s = SlugFieldSerializer(data={'slug_field': 'a b'})
-
-#         self.assertEqual(s.is_valid(), False)
-#         self.assertEqual(s.errors, {'slug_field': ["Enter a valid 'slug' consisting of letters, numbers, underscores or hyphens."]})
-
-
-# class URLFieldTests(TestCase):
-#     """
-#     Tests for URLField attribute values.
-
-#     (Includes test for #1210, checking that validators can be overridden.)
-#     """
-
-#     class URLFieldModel(RESTFrameworkModel):
-#         url_field = models.URLField(blank=True)
-
-#     class URLFieldWithGivenMaxLengthModel(RESTFrameworkModel):
-#         url_field = models.URLField(max_length=128, blank=True)
-
-#     def test_default_model_value(self):
-#         class URLFieldSerializer(serializers.ModelSerializer):
-#             class Meta:
-#                 model = self.URLFieldModel
-
-#         serializer = URLFieldSerializer(data={})
-#         self.assertEqual(serializer.is_valid(), True)
-#         self.assertEqual(getattr(serializer.fields['url_field'],
-#                                  'max_length'), 200)
-
-#     def test_given_model_value(self):
-#         class URLFieldSerializer(serializers.ModelSerializer):
-#             class Meta:
-#                 model = self.URLFieldWithGivenMaxLengthModel
-
-#         serializer = URLFieldSerializer(data={})
-#         self.assertEqual(serializer.is_valid(), True)
-#         self.assertEqual(getattr(serializer.fields['url_field'],
-#                                  'max_length'), 128)
-
-#     def test_given_serializer_value(self):
-#         class URLFieldSerializer(serializers.ModelSerializer):
-#             url_field = serializers.URLField(source='url_field',
-#                                              max_length=20, required=False)
-
-#             class Meta:
-#                 model = self.URLFieldWithGivenMaxLengthModel
-
-#         serializer = URLFieldSerializer(data={})
-#         self.assertEqual(serializer.is_valid(), True)
-#         self.assertEqual(getattr(serializer.fields['url_field'],
-#                          'max_length'), 20)
-
-#     def test_validators_can_be_overridden(self):
-#         url_field = serializers.URLField(validators=[])
-#         validators = url_field.validators
-#         self.assertEqual([], validators, 'Passing `validators` kwarg should have overridden default validators')
-
-
-# class FieldMetadata(TestCase):
-#     def setUp(self):
-#         self.required_field = serializers.Field()
-#         self.required_field.label = uuid4().hex
-#         self.required_field.required = True
-
-#         self.optional_field = serializers.Field()
-#         self.optional_field.label = uuid4().hex
-#         self.optional_field.required = False
-
-#     def test_required(self):
-#         self.assertEqual(self.required_field.metadata()['required'], True)
-
-#     def test_optional(self):
-#         self.assertEqual(self.optional_field.metadata()['required'], False)
-
-#     def test_label(self):
-#         for field in (self.required_field, self.optional_field):
-#             self.assertEqual(field.metadata()['label'], field.label)
-
-
-# class FieldCallableDefault(TestCase):
-#     def setUp(self):
-#         self.simple_callable = lambda: 'foo bar'
-
-#     def test_default_can_be_simple_callable(self):
-#         """
-#         Ensure that the 'default' argument can also be a simple callable.
-#         """
-#         field = serializers.WritableField(default=self.simple_callable)
-#         into = {}
-#         field.field_from_native({}, {}, 'field', into)
-#         self.assertEqual(into, {'field': 'foo bar'})
-
-
-# class CustomIntegerField(TestCase):
-#     """
-#         Test that custom fields apply min_value and max_value constraints
-#     """
-#     def test_custom_fields_can_be_validated_for_value(self):
-
-#         class MoneyField(models.PositiveIntegerField):
-#             pass
-
-#         class EntryModel(models.Model):
-#             bank = MoneyField(validators=[validators.MaxValueValidator(100)])
-
-#         class EntrySerializer(serializers.ModelSerializer):
-#             class Meta:
-#                 model = EntryModel
-
-#         entry = EntryModel(bank=1)
-
-#         serializer = EntrySerializer(entry, data={"bank": 11})
-#         self.assertTrue(serializer.is_valid())
-
-#         serializer = EntrySerializer(entry, data={"bank": -1})
-#         self.assertFalse(serializer.is_valid())
-
-#         serializer = EntrySerializer(entry, data={"bank": 101})
-#         self.assertFalse(serializer.is_valid())
-
-
-# class BooleanField(TestCase):
-#     """
-#         Tests for BooleanField
-#     """
-#     def test_boolean_required(self):
-#         class BooleanRequiredSerializer(serializers.Serializer):
-#             bool_field = serializers.BooleanField(required=True)
-
-#         self.assertFalse(BooleanRequiredSerializer(data={}).is_valid())
-
-
-# class SerializerMethodFieldTest(TestCase):
-#     """
-#         Tests for the SerializerMethodField field_to_native() behavior
-#     """
-#     class SerializerTest(serializers.Serializer):
-#         def get_my_test(self, obj):
-#             return obj.my_test[0:5]
-
-# class ModelCharField(TestCase):
-#     """
-#         Tests for CharField
-#     """
-#     def test_none_serializing(self):
-#         class CharFieldSerializer(serializers.Serializer):
-#             char = serializers.CharField(allow_none=True, required=False)
-#         serializer = CharFieldSerializer(data={'char': None})
-#         self.assertTrue(serializer.is_valid())
-#         self.assertIsNone(serializer.object['char'])
-
-
-# class SerializerMethodFieldTest(TestCase):
-#     """
-#         Tests for the SerializerMethodField field_to_native() behavior
-#     """
-#     class SerializerTest(serializers.Serializer):
-#         def get_my_test(self, obj):
-#             return obj.my_test[0:5]
-
-#     class Example():
-#         my_test = 'Hey, this is a test !'
-
-#     def test_field_to_native(self):
-#         s = serializers.SerializerMethodField('get_my_test')
-#         s.initialize(self.SerializerTest(), 'name')
-#         result = s.field_to_native(self.Example(), None)
-#         self.assertEqual(result, 'Hey, ')