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""" Tests for L{twisted.names.common}. """ from __future__ import division, absolute_import from zope.interface.verify import verifyClass from twisted.internet.interfaces import IResolver from twisted.trial.unittest import SynchronousTestCase from twisted.python.failure import Failure from twisted.names.common import ResolverBase from twisted.names.dns import EFORMAT, ESERVER, ENAME, ENOTIMP, EREFUSED, Query from twisted.names.error import DNSFormatError, DNSServerError, DNSNameError from twisted.names.error import DNSNotImplementedError, DNSQueryRefusedError from twisted.names.error import DNSUnknownError class ExceptionForCodeTests(SynchronousTestCase): """ Tests for L{ResolverBase.exceptionForCode}. """ def setUp(self): self.exceptionForCode = ResolverBase().exceptionForCode def test_eformat(self): """ L{ResolverBase.exceptionForCode} converts L{EFORMAT} to L{DNSFormatError}. """ self.assertIs(self.exceptionForCode(EFORMAT), DNSFormatError) def test_eserver(self): """ L{ResolverBase.exceptionForCode} converts L{ESERVER} to L{DNSServerError}. """ self.assertIs(self.exceptionForCode(ESERVER), DNSServerError) def test_ename(self): """ L{ResolverBase.exceptionForCode} converts L{ENAME} to L{DNSNameError}. """ self.assertIs(self.exceptionForCode(ENAME), DNSNameError) def test_enotimp(self): """ L{ResolverBase.exceptionForCode} converts L{ENOTIMP} to L{DNSNotImplementedError}. """ self.assertIs(self.exceptionForCode(ENOTIMP), DNSNotImplementedError) def test_erefused(self): """ L{ResolverBase.exceptionForCode} converts L{EREFUSED} to L{DNSQueryRefusedError}. """ self.assertIs(self.exceptionForCode(EREFUSED), DNSQueryRefusedError) def test_other(self): """ L{ResolverBase.exceptionForCode} converts any other response code to L{DNSUnknownError}. """ self.assertIs(self.exceptionForCode(object()), DNSUnknownError) class QueryTests(SynchronousTestCase): """ Tests for L{ResolverBase.query}. """ def test_resolverBaseProvidesIResolver(self): """ L{ResolverBase} provides the L{IResolver} interface. """ verifyClass(IResolver, ResolverBase) def test_typeToMethodDispatch(self): """ L{ResolverBase.query} looks up a method to invoke using the type of the query passed to it and the C{typeToMethod} mapping on itself. """ results = [] resolver = ResolverBase() resolver.typeToMethod = { 12345: lambda query, timeout: results.append((query, timeout))} query = Query(name=b"example.com", type=12345) resolver.query(query, 123) self.assertEqual([(b"example.com", 123)], results) def test_typeToMethodResult(self): """ L{ResolverBase.query} returns a L{Deferred} which fires with the result of the method found in the C{typeToMethod} mapping for the type of the query passed to it. """ expected = object() resolver = ResolverBase() resolver.typeToMethod = {54321: lambda query, timeout: expected} query = Query(name=b"example.com", type=54321) queryDeferred = resolver.query(query, 123) result = [] queryDeferred.addBoth(result.append) self.assertEqual(expected, result[0]) def test_unknownQueryType(self): """ L{ResolverBase.query} returns a L{Deferred} which fails with L{NotImplementedError} when called with a query of a type not present in its C{typeToMethod} dictionary. """ resolver = ResolverBase() resolver.typeToMethod = {} query = Query(name=b"example.com", type=12345) queryDeferred = resolver.query(query, 123) result = [] queryDeferred.addBoth(result.append) self.assertIsInstance(result[0], Failure) result[0].trap(NotImplementedError)