Merge pull request #1 from tomchristie/master

Merge in from upstream

1 files changed, 1212 insertions, 0 deletions

diff --git a/tests/test_fields.py b/tests/test_fields.py
new file mode 100644
index 00000000..1aa528da
--- /dev/null
+++ b/tests/test_fields.py
@@ -0,0 +1,1212 @@
+from decimal import Decimal
+from django.utils import timezone
+from rest_framework import serializers
+import datetime
+import django
+import pytest
+import uuid
+
+
+# Tests for field keyword arguments and core functionality.
+# ---------------------------------------------------------
+
+class TestEmpty:
+    """
+    Tests for `required`, `allow_null`, `allow_blank`, `default`.
+    """
+    def test_required(self):
+        """
+        By default a field must be included in the input.
+        """
+        field = serializers.IntegerField()
+        with pytest.raises(serializers.ValidationError) as exc_info:
+            field.run_validation()
+        assert exc_info.value.detail == ['This field is required.']
+
+    def test_not_required(self):
+        """
+        If `required=False` then a field may be omitted from the input.
+        """
+        field = serializers.IntegerField(required=False)
+        with pytest.raises(serializers.SkipField):
+            field.run_validation()
+
+    def test_disallow_null(self):
+        """
+        By default `None` is not a valid input.
+        """
+        field = serializers.IntegerField()
+        with pytest.raises(serializers.ValidationError) as exc_info:
+            field.run_validation(None)
+        assert exc_info.value.detail == ['This field may not be null.']
+
+    def test_allow_null(self):
+        """
+        If `allow_null=True` then `None` is a valid input.
+        """
+        field = serializers.IntegerField(allow_null=True)
+        output = field.run_validation(None)
+        assert output is None
+
+    def test_disallow_blank(self):
+        """
+        By default '' is not a valid input.
+        """
+        field = serializers.CharField()
+        with pytest.raises(serializers.ValidationError) as exc_info:
+            field.run_validation('')
+        assert exc_info.value.detail == ['This field may not be blank.']
+
+    def test_allow_blank(self):
+        """
+        If `allow_blank=True` then '' is a valid input.
+        """
+        field = serializers.CharField(allow_blank=True)
+        output = field.run_validation('')
+        assert output == ''
+
+    def test_default(self):
+        """
+        If `default` is set, then omitted values get the default input.
+        """
+        field = serializers.IntegerField(default=123)
+        output = field.run_validation()
+        assert output is 123
+
+
+class TestSource:
+    def test_source(self):
+        class ExampleSerializer(serializers.Serializer):
+            example_field = serializers.CharField(source='other')
+        serializer = ExampleSerializer(data={'example_field': 'abc'})
+        assert serializer.is_valid()
+        assert serializer.validated_data == {'other': 'abc'}
+
+    def test_redundant_source(self):
+        class ExampleSerializer(serializers.Serializer):
+            example_field = serializers.CharField(source='example_field')
+        with pytest.raises(AssertionError) as exc_info:
+            ExampleSerializer().fields
+        assert str(exc_info.value) == (
+            "It is redundant to specify `source='example_field'` on field "
+            "'CharField' in serializer 'ExampleSerializer', because it is the "
+            "same as the field name. Remove the `source` keyword argument."
+        )
+
+    def test_callable_source(self):
+        class ExampleSerializer(serializers.Serializer):
+            example_field = serializers.CharField(source='example_callable')
+
+        class ExampleInstance(object):
+            def example_callable(self):
+                return 'example callable value'
+
+        serializer = ExampleSerializer(ExampleInstance())
+        assert serializer.data['example_field'] == 'example callable value'
+
+    def test_callable_source_raises(self):
+        class ExampleSerializer(serializers.Serializer):
+            example_field = serializers.CharField(source='example_callable', read_only=True)
+
+        class ExampleInstance(object):
+            def example_callable(self):
+                raise AttributeError('method call failed')
+
+        with pytest.raises(ValueError) as exc_info:
+            serializer = ExampleSerializer(ExampleInstance())
+            serializer.data.items()
+
+        assert 'method call failed' in str(exc_info.value)
+
+
+class TestReadOnly:
+    def setup(self):
+        class TestSerializer(serializers.Serializer):
+            read_only = serializers.ReadOnlyField()
+            writable = serializers.IntegerField()
+        self.Serializer = TestSerializer
+
+    def test_validate_read_only(self):
+        """
+        Read-only serializers.should not be included in validation.
+        """
+        data = {'read_only': 123, 'writable': 456}
+        serializer = self.Serializer(data=data)
+        assert serializer.is_valid()
+        assert serializer.validated_data == {'writable': 456}
+
+    def test_serialize_read_only(self):
+        """
+        Read-only serializers.should be serialized.
+        """
+        instance = {'read_only': 123, 'writable': 456}
+        serializer = self.Serializer(instance)
+        assert serializer.data == {'read_only': 123, 'writable': 456}
+
+
+class TestWriteOnly:
+    def setup(self):
+        class TestSerializer(serializers.Serializer):
+            write_only = serializers.IntegerField(write_only=True)
+            readable = serializers.IntegerField()
+        self.Serializer = TestSerializer
+
+    def test_validate_write_only(self):
+        """
+        Write-only serializers.should be included in validation.
+        """
+        data = {'write_only': 123, 'readable': 456}
+        serializer = self.Serializer(data=data)
+        assert serializer.is_valid()
+        assert serializer.validated_data == {'write_only': 123, 'readable': 456}
+
+    def test_serialize_write_only(self):
+        """
+        Write-only serializers.should not be serialized.
+        """
+        instance = {'write_only': 123, 'readable': 456}
+        serializer = self.Serializer(instance)
+        assert serializer.data == {'readable': 456}
+
+
+class TestInitial:
+    def setup(self):
+        class TestSerializer(serializers.Serializer):
+            initial_field = serializers.IntegerField(initial=123)
+            blank_field = serializers.IntegerField()
+        self.serializer = TestSerializer()
+
+    def test_initial(self):
+        """
+        Initial values should be included when serializing a new representation.
+        """
+        assert self.serializer.data == {
+            'initial_field': 123,
+            'blank_field': None
+        }
+
+
+class TestLabel:
+    def setup(self):
+        class TestSerializer(serializers.Serializer):
+            labeled = serializers.IntegerField(label='My label')
+        self.serializer = TestSerializer()
+
+    def test_label(self):
+        """
+        A field's label may be set with the `label` argument.
+        """
+        fields = self.serializer.fields
+        assert fields['labeled'].label == 'My label'
+
+
+class TestInvalidErrorKey:
+    def setup(self):
+        class ExampleField(serializers.Field):
+            def to_native(self, data):
+                self.fail('incorrect')
+        self.field = ExampleField()
+
+    def test_invalid_error_key(self):
+        """
+        If a field raises a validation error, but does not have a corresponding
+        error message, then raise an appropriate assertion error.
+        """
+        with pytest.raises(AssertionError) as exc_info:
+            self.field.to_native(123)
+        expected = (
+            'ValidationError raised by `ExampleField`, but error key '
+            '`incorrect` does not exist in the `error_messages` dictionary.'
+        )
+        assert str(exc_info.value) == expected
+
+
+class TestBooleanHTMLInput:
+    def setup(self):
+        class TestSerializer(serializers.Serializer):
+            archived = serializers.BooleanField()
+        self.Serializer = TestSerializer
+
+    def test_empty_html_checkbox(self):
+        """
+        HTML checkboxes do not send any value, but should be treated
+        as `False` by BooleanField.
+        """
+        # This class mocks up a dictionary like object, that behaves
+        # as if it was returned for multipart or urlencoded data.
+        class MockHTMLDict(dict):
+            getlist = None
+        serializer = self.Serializer(data=MockHTMLDict())
+        assert serializer.is_valid()
+        assert serializer.validated_data == {'archived': False}
+
+
+class MockHTMLDict(dict):
+    """
+    This class mocks up a dictionary like object, that behaves
+    as if it was returned for multipart or urlencoded data.
+    """
+    getlist = None
+
+
+class TestHTMLInput:
+    def test_empty_html_charfield(self):
+        class TestSerializer(serializers.Serializer):
+            message = serializers.CharField(default='happy')
+
+        serializer = TestSerializer(data=MockHTMLDict())
+        assert serializer.is_valid()
+        assert serializer.validated_data == {'message': 'happy'}
+
+    def test_empty_html_charfield_allow_null(self):
+        class TestSerializer(serializers.Serializer):
+            message = serializers.CharField(allow_null=True)
+
+        serializer = TestSerializer(data=MockHTMLDict({'message': ''}))
+        assert serializer.is_valid()
+        assert serializer.validated_data == {'message': None}
+
+    def test_empty_html_datefield_allow_null(self):
+        class TestSerializer(serializers.Serializer):
+            expiry = serializers.DateField(allow_null=True)
+
+        serializer = TestSerializer(data=MockHTMLDict({'expiry': ''}))
+        assert serializer.is_valid()
+        assert serializer.validated_data == {'expiry': None}
+
+    def test_empty_html_charfield_allow_null_allow_blank(self):
+        class TestSerializer(serializers.Serializer):
+            message = serializers.CharField(allow_null=True, allow_blank=True)
+
+        serializer = TestSerializer(data=MockHTMLDict({'message': ''}))
+        assert serializer.is_valid()
+        assert serializer.validated_data == {'message': ''}
+
+    def test_empty_html_charfield_required_false(self):
+        class TestSerializer(serializers.Serializer):
+            message = serializers.CharField(required=False)
+
+        serializer = TestSerializer(data=MockHTMLDict())
+        assert serializer.is_valid()
+        assert serializer.validated_data == {}
+
+
+class TestCreateOnlyDefault:
+    def setup(self):
+        default = serializers.CreateOnlyDefault('2001-01-01')
+
+        class TestSerializer(serializers.Serializer):
+            published = serializers.HiddenField(default=default)
+            text = serializers.CharField()
+        self.Serializer = TestSerializer
+
+    def test_create_only_default_is_provided(self):
+        serializer = self.Serializer(data={'text': 'example'})
+        assert serializer.is_valid()
+        assert serializer.validated_data == {
+            'text': 'example', 'published': '2001-01-01'
+        }
+
+    def test_create_only_default_is_not_provided_on_update(self):
+        instance = {
+            'text': 'example', 'published': '2001-01-01'
+        }
+        serializer = self.Serializer(instance, data={'text': 'example'})
+        assert serializer.is_valid()
+        assert serializer.validated_data == {
+            'text': 'example',
+        }
+
+    def test_create_only_default_callable_sets_context(self):
+        """
+        CreateOnlyDefault instances with a callable default should set_context
+        on the callable if possible
+        """
+        class TestCallableDefault:
+            def set_context(self, serializer_field):
+                self.field = serializer_field
+
+            def __call__(self):
+                return "success" if hasattr(self, 'field') else "failure"
+
+        class TestSerializer(serializers.Serializer):
+            context_set = serializers.CharField(default=serializers.CreateOnlyDefault(TestCallableDefault()))
+
+        serializer = TestSerializer(data={})
+        assert serializer.is_valid()
+        assert serializer.validated_data['context_set'] == 'success'
+
+
+# Tests for field input and output values.
+# ----------------------------------------
+
+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(serializers.ValidationError) as exc_info:
+                self.field.run_validation(input_value)
+            assert exc_info.value.detail == 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 and invalid values for `BooleanField`.
+    """
+    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.'],
+        None: ['This field may not be null.']
+    }
+    outputs = {
+        'true': True,
+        'false': False,
+        '1': True,
+        '0': False,
+        1: True,
+        0: False,
+        True: True,
+        False: False,
+        'other': True
+    }
+    field = serializers.BooleanField()
+
+
+class TestNullBooleanField(FieldValues):
+    """
+    Valid and invalid values for `BooleanField`.
+    """
+    valid_inputs = {
+        'true': True,
+        'false': False,
+        'null': None,
+        True: True,
+        False: False,
+        None: None
+    }
+    invalid_inputs = {
+        'foo': ['"foo" is not a valid boolean.'],
+    }
+    outputs = {
+        'true': True,
+        'false': False,
+        'null': None,
+        True: True,
+        False: False,
+        None: None,
+        'other': True
+    }
+    field = serializers.NullBooleanField()
+
+
+# String types...
+
+class TestCharField(FieldValues):
+    """
+    Valid and invalid values for `CharField`.
+    """
+    valid_inputs = {
+        1: '1',
+        'abc': 'abc'
+    }
+    invalid_inputs = {
+        '': ['This field may not be blank.']
+    }
+    outputs = {
+        1: '1',
+        'abc': 'abc'
+    }
+    field = serializers.CharField()
+
+    def test_trim_whitespace_default(self):
+        field = serializers.CharField()
+        assert field.to_internal_value(' abc ') == 'abc'
+
+    def test_trim_whitespace_disabled(self):
+        field = serializers.CharField(trim_whitespace=False)
+        assert field.to_internal_value(' abc ') == ' abc '
+
+
+class TestEmailField(FieldValues):
+    """
+    Valid and invalid values for `EmailField`.
+    """
+    valid_inputs = {
+        'example@example.com': 'example@example.com',
+        ' example@example.com ': 'example@example.com',
+    }
+    invalid_inputs = {
+        'examplecom': ['Enter a valid email address.']
+    }
+    outputs = {}
+    field = serializers.EmailField()
+
+
+class TestRegexField(FieldValues):
+    """
+    Valid and invalid values for `RegexField`.
+    """
+    valid_inputs = {
+        'a9': 'a9',
+    }
+    invalid_inputs = {
+        'A9': ["This value does not match the required pattern."]
+    }
+    outputs = {}
+    field = serializers.RegexField(regex='[a-z][0-9]')
+
+
+class TestSlugField(FieldValues):
+    """
+    Valid and invalid values for `SlugField`.
+    """
+    valid_inputs = {
+        'slug-99': 'slug-99',
+    }
+    invalid_inputs = {
+        'slug 99': ['Enter a valid "slug" consisting of letters, numbers, underscores or hyphens.']
+    }
+    outputs = {}
+    field = serializers.SlugField()
+
+
+class TestURLField(FieldValues):
+    """
+    Valid and invalid values for `URLField`.
+    """
+    valid_inputs = {
+        'http://example.com': 'http://example.com',
+    }
+    invalid_inputs = {
+        'example.com': ['Enter a valid URL.']
+    }
+    outputs = {}
+    field = serializers.URLField()
+
+
+class TestUUIDField(FieldValues):
+    """
+    Valid and invalid values for `UUIDField`.
+    """
+    valid_inputs = {
+        '825d7aeb-05a9-45b5-a5b7-05df87923cda': uuid.UUID('825d7aeb-05a9-45b5-a5b7-05df87923cda'),
+        '825d7aeb05a945b5a5b705df87923cda': uuid.UUID('825d7aeb-05a9-45b5-a5b7-05df87923cda')
+    }
+    invalid_inputs = {
+        '825d7aeb-05a9-45b5-a5b7': ['"825d7aeb-05a9-45b5-a5b7" is not a valid UUID.']
+    }
+    outputs = {
+        uuid.UUID('825d7aeb-05a9-45b5-a5b7-05df87923cda'): '825d7aeb-05a9-45b5-a5b7-05df87923cda'
+    }
+    field = serializers.UUIDField()
+
+
+# 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 = serializers.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 = serializers.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 = serializers.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 = serializers.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 = serializers.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 = serializers.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 = serializers.DecimalField(
+        max_digits=3, decimal_places=1,
+        coerce_to_string=False
+    )
+
+
+# Date & time serializers...
+
+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 = serializers.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 = serializers.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 = serializers.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 = serializers.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()),
+        # Django 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 = serializers.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 = serializers.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 = serializers.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 = serializers.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 = serializers.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 = serializers.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 = serializers.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 = serializers.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 = serializers.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 = serializers.ChoiceField(
+        choices=[
+            ('poor', 'Poor quality'),
+            ('medium', 'Medium quality'),
+            ('good', 'Good quality'),
+        ]
+    )
+
+    def test_allow_blank(self):
+        """
+        If `allow_blank=True` then '' is a valid input.
+        """
+        field = serializers.ChoiceField(
+            allow_blank=True,
+            choices=[
+                ('poor', 'Poor quality'),
+                ('medium', 'Medium quality'),
+                ('good', 'Good quality'),
+            ]
+        )
+        output = field.run_validation('')
+        assert output == ''
+
+
+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 = serializers.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 = serializers.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 = serializers.MultipleChoiceField(
+        choices=[
+            ('aircon', 'AirCon'),
+            ('manual', 'Manual drive'),
+            ('diesel', 'Diesel'),
+        ]
+    )
+
+
+# File serializers...
+
+class MockFile:
+    def __init__(self, name='', size=0, url=''):
+        self.name = name
+        self.size = size
+        self.url = url
+
+    def __eq__(self, other):
+        return (
+            isinstance(other, MockFile) and
+            self.name == other.name and
+            self.size == other.size and
+            self.url == other.url
+        )
+
+
+class TestFileField(FieldValues):
+    """
+    Values for `FileField`.
+    """
+    valid_inputs = [
+        (MockFile(name='example', size=10), MockFile(name='example', size=10))
+    ]
+    invalid_inputs = [
+        ('invalid', ['The submitted data was not a file. Check the encoding type on the form.']),
+        (MockFile(name='example.txt', size=0), ['The submitted file is empty.']),
+        (MockFile(name='', size=10), ['No filename could be determined.']),
+        (MockFile(name='x' * 100, size=10), ['Ensure this filename has at most 10 characters (it has 100).'])
+    ]
+    outputs = [
+        (MockFile(name='example.txt', url='/example.txt'), '/example.txt'),
+        ('', None)
+    ]
+    field = serializers.FileField(max_length=10)
+
+
+class TestFieldFieldWithName(FieldValues):
+    """
+    Values for `FileField` with a filename output instead of URLs.
+    """
+    valid_inputs = {}
+    invalid_inputs = {}
+    outputs = [
+        (MockFile(name='example.txt', url='/example.txt'), 'example.txt')
+    ]
+    field = serializers.FileField(use_url=False)
+
+
+# Stub out mock Django `forms.ImageField` class so we don't *actually*
+# call into it's regular validation, or require PIL for testing.
+class FailImageValidation(object):
+    def to_python(self, value):
+        raise serializers.ValidationError(self.error_messages['invalid_image'])
+
+
+class PassImageValidation(object):
+    def to_python(self, value):
+        return value
+
+
+class TestInvalidImageField(FieldValues):
+    """
+    Values for an invalid `ImageField`.
+    """
+    valid_inputs = {}
+    invalid_inputs = [
+        (MockFile(name='example.txt', size=10), ['Upload a valid image. The file you uploaded was either not an image or a corrupted image.'])
+    ]
+    outputs = {}
+    field = serializers.ImageField(_DjangoImageField=FailImageValidation)
+
+
+class TestValidImageField(FieldValues):
+    """
+    Values for an valid `ImageField`.
+    """
+    valid_inputs = [
+        (MockFile(name='example.txt', size=10), MockFile(name='example.txt', size=10))
+    ]
+    invalid_inputs = {}
+    outputs = {}
+    field = serializers.ImageField(_DjangoImageField=PassImageValidation)
+
+
+# Composite serializers...
+
+class TestListField(FieldValues):
+    """
+    Values for `ListField` with IntegerField as child.
+    """
+    valid_inputs = [
+        ([1, 2, 3], [1, 2, 3]),
+        (['1', '2', '3'], [1, 2, 3])
+    ]
+    invalid_inputs = [
+        ('not a list', ['Expected a list of items but got type "str".']),
+        ([1, 2, 'error'], ['A valid integer is required.'])
+    ]
+    outputs = [
+        ([1, 2, 3], [1, 2, 3]),
+        (['1', '2', '3'], [1, 2, 3])
+    ]
+    field = serializers.ListField(child=serializers.IntegerField())
+
+
+class TestUnvalidatedListField(FieldValues):
+    """
+    Values for `ListField` with no `child` argument.
+    """
+    valid_inputs = [
+        ([1, '2', True, [4, 5, 6]], [1, '2', True, [4, 5, 6]]),
+    ]
+    invalid_inputs = [
+        ('not a list', ['Expected a list of items but got type "str".']),
+    ]
+    outputs = [
+        ([1, '2', True, [4, 5, 6]], [1, '2', True, [4, 5, 6]]),
+    ]
+    field = serializers.ListField()
+
+
+class TestDictField(FieldValues):
+    """
+    Values for `ListField` with CharField as child.
+    """
+    valid_inputs = [
+        ({'a': 1, 'b': '2', 3: 3}, {'a': '1', 'b': '2', '3': '3'}),
+    ]
+    invalid_inputs = [
+        ({'a': 1, 'b': None}, ['This field may not be null.']),
+        ('not a dict', ['Expected a dictionary of items but got type "str".']),
+    ]
+    outputs = [
+        ({'a': 1, 'b': '2', 3: 3}, {'a': '1', 'b': '2', '3': '3'}),
+    ]
+    field = serializers.DictField(child=serializers.CharField())
+
+
+class TestUnvalidatedDictField(FieldValues):
+    """
+    Values for `ListField` with no `child` argument.
+    """
+    valid_inputs = [
+        ({'a': 1, 'b': [4, 5, 6], 1: 123}, {'a': 1, 'b': [4, 5, 6], '1': 123}),
+    ]
+    invalid_inputs = [
+        ('not a dict', ['Expected a dictionary of items but got type "str".']),
+    ]
+    outputs = [
+        ({'a': 1, 'b': [4, 5, 6]}, {'a': 1, 'b': [4, 5, 6]}),
+    ]
+    field = serializers.DictField()
+
+
+# Tests for FieldField.
+# ---------------------
+
+class MockRequest:
+    def build_absolute_uri(self, value):
+        return 'http://example.com' + value
+
+
+class TestFileFieldContext:
+    def test_fully_qualified_when_request_in_context(self):
+        field = serializers.FileField(max_length=10)
+        field._context = {'request': MockRequest()}
+        obj = MockFile(name='example.txt', url='/example.txt')
+        value = field.to_representation(obj)
+        assert value == 'http://example.com/example.txt'
+
+
+# Tests for SerializerMethodField.
+# --------------------------------
+
+class TestSerializerMethodField:
+    def test_serializer_method_field(self):
+        class ExampleSerializer(serializers.Serializer):
+            example_field = serializers.SerializerMethodField()
+
+            def get_example_field(self, obj):
+                return 'ran get_example_field(%d)' % obj['example_field']
+
+        serializer = ExampleSerializer({'example_field': 123})
+        assert serializer.data == {
+            'example_field': 'ran get_example_field(123)'
+        }
+
+    def test_redundant_method_name(self):
+        class ExampleSerializer(serializers.Serializer):
+            example_field = serializers.SerializerMethodField('get_example_field')
+
+        with pytest.raises(AssertionError) as exc_info:
+            ExampleSerializer().fields
+        assert str(exc_info.value) == (
+            "It is redundant to specify `get_example_field` on "
+            "SerializerMethodField 'example_field' in serializer "
+            "'ExampleSerializer', because it is the same as the default "
+            "method name. Remove the `method_name` argument."
+        )