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name : test_roots.py
 # Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.


from twisted.python import roots
from twisted.trial import unittest


class RootsTests(unittest.TestCase):
    def testExceptions(self) -> None:
        request = roots.Request()
        try:
            request.write(b"blah")
        except NotImplementedError:
            pass
        else:
            self.fail()
        try:
            request.finish()
        except NotImplementedError:
            pass
        else:
            self.fail()

    def testCollection(self) -> None:
        collection = roots.Collection()
        collection.putEntity("x", "test")
        self.assertEqual(collection.getStaticEntity("x"), "test")
        collection.delEntity("x")
        self.assertEqual(collection.getStaticEntity("x"), None)
        try:
            collection.storeEntity("x", None)
        except NotImplementedError:
            pass
        else:
            self.fail()
        try:
            collection.removeEntity("x", None)
        except NotImplementedError:
            pass
        else:
            self.fail()

    def testConstrained(self) -> None:
        class const(roots.Constrained):
            def nameConstraint(self, name: str) -> bool:
                return name == "x"

        c = const()
        self.assertIsNone(c.putEntity("x", "test"))
        self.assertRaises(roots.ConstraintViolation, c.putEntity, "y", "test")

    def testHomogenous(self) -> None:
        h = roots.Homogenous()
        h.entityType = int
        h.putEntity("a", 1)
        self.assertEqual(h.getStaticEntity("a"), 1)
        self.assertRaises(roots.ConstraintViolation, h.putEntity, "x", "y")
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