Class TestData

django/test/testcases.py:1340–1375

Descriptor to provide TestCase instance isolation for attributes assigned during the setUpTestData() phase. Allow safe alteration of objects assigned in setUpTestData() by test methods by exposing deep copies instead of the original objects. Objects are deep copied using a mem

class TestData:
    """
    Descriptor to provide TestCase instance isolation for attributes assigned
    during the setUpTestData() phase.

    Allow safe alteration of objects assigned in setUpTestData() by test
    methods by exposing deep copies instead of the original objects.

    Objects are deep copied using a memo kept on the test case instance in
    order to maintain their original relationships.
    """

    memo_attr = "_testdata_memo"

    def __init__(self, name, data):
        self.name = name
        self.data = data

    def get_memo(self, testcase):
        try:
            memo = getattr(testcase, self.memo_attr)
        except AttributeError:
            memo = {}
            setattr(testcase, self.memo_attr, memo)
        return memo

    def __get__(self, instance, owner):
        if instance is None:
            return self.data
        memo = self.get_memo(instance)
        data = deepcopy(self.data, memo)
        setattr(instance, self.name, data)
        return data

    def __repr__(self):
        return "<TestData: name=%r, data=%r>" % (self.name, self.data)


class TestCase(TransactionTestCase):