Shows mongoengine tuple->list conversion

mongoengine_test.py

import unittest
from mongoengine.base import BaseField
from mongoengine.document import Document
from mongoengine.fields import ListField
from test import connect, disconnect

class EnumField(BaseField):
    def __init__(self, **kwargs):
        super(EnumField,self).__init__(**kwargs)

    def to_mongo(self, value):
        return value

    def to_python(self, value):
        return tuple(value)

class TestDoc(Document):
    items = ListField(EnumField())

class TestMongoEngine(unittest.TestCase):
    def setUp(self):
        connect()
        TestDoc.drop_collection()

    def tearDown(self):
        disconnect()

    def test_tuple_in_list(self):
        tuples = [(100,'Testing')]
        doc = TestDoc()
        doc.items = tuples
        doc.save()
        x = TestDoc.objects().get()
        assert x is not None
        assert len(x.items) == 1
        assert tuple(x.items[0]) in tuples
        assert x.items[0] in tuples          # fails at this line