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from unittest import TestCase

import simplejson as json

class JSONTestObject:
    pass


class RecursiveJSONEncoder(json.JSONEncoder):
    recurse = False
    def default(self, o):
        if o is JSONTestObject:
            if self.recurse:
                return [JSONTestObject]
            else:
                return 'JSONTestObject'
        return json.JSONEncoder.default(o)


class TestRecursion(TestCase):
    def test_listrecursion(self):
        x = []
        x.append(x)
        try:
            json.dumps(x)
        except ValueError:
            pass
        else:
            self.fail("didn't raise ValueError on list recursion")
        x = []
        y = [x]
        x.append(y)
        try:
            json.dumps(x)
        except ValueError:
            pass
        else:
            self.fail("didn't raise ValueError on alternating list recursion")
        y = []
        x = [y, y]
        # ensure that the marker is cleared
        json.dumps(x)

    def test_dictrecursion(self):
        x = {}
        x["test"] = x
        try:
            json.dumps(x)
        except ValueError:
            pass
        else:
            self.fail("didn't raise ValueError on dict recursion")
        x = {}
        y = {"a": x, "b": x}
        # ensure that the marker is cleared
        json.dumps(y)

    def test_defaultrecursion(self):
        enc = RecursiveJSONEncoder()
        self.assertEqual(enc.encode(JSONTestObject), '"JSONTestObject"')
        enc.recurse = True
        try:
            enc.encode(JSONTestObject)
        except ValueError:
            pass
        else:
            self.fail("didn't raise ValueError on default recursion")