test_allow_blank.py

from django.http import QueryDict

from rest_framework import serializers


class TestAllowBlank:
    def test_query_dict_without_default(self):
        """
        For a non-required CharField that allows blanks an empty string
        is omitted from the validated serializer data if passed as
        HTML input data.
        """
        class TestSerializer(serializers.Serializer):
            title = serializers.CharField(required=False, allow_blank=True)

        serializer = TestSerializer(data=QueryDict('title='))
        assert serializer.is_valid()
        assert serializer.validated_data == {}

    def test_query_dict_with_default(self):
        """
        If the empty string is defined as default value of the CharField
        it is included in the validated serializer data.
        """
        class TestSerializer(serializers.Serializer):
            title = serializers.CharField(required=False, allow_blank=True,
                                          default='')

        serializer = TestSerializer(data=QueryDict('title='))
        assert serializer.is_valid()
        assert serializer.validated_data == {'title': ''}

    def test_dict(self):
        """
        If the empty string is passed in an ordinary dict (JSON request)
        it is included in the validated serializer data, too.
        """
        class TestSerializer(serializers.Serializer):
            title = serializers.CharField(required=False, allow_blank=True)

        serializer = TestSerializer(data={'title': ''})
        assert serializer.is_valid()
        assert serializer.validated_data == {'title': ''}