twisted.names.test.test_rootresolve.RootResolverTests

class documentation

class RootResolverTests(TestCase): (source)

Tests for twisted.names.root.Resolver.

Method	`test_answerless`	If a query is responded to with no answers or nameserver records, the `Deferred` returned by `Resolver.lookupAddress` fires with `ResolverError`.
Method	`test_boundedQueries`	`Resolver.lookupAddress` won't issue more queries following delegations than the limit passed to its initializer.
Method	`test_delegationLookupEmpty`	If there are no records in the response to a lookup of a delegation nameserver, the `Deferred` returned by `Resolver.lookupAddress` fires with `ResolverError`.
Method	`test_delegationLookupError`	If there is an error resolving the nameserver in a delegation response, the `Deferred` returned by `Resolver.lookupAddress` fires with that error.
Method	`test_detectCanonicalNameLoop`	If there is a cycle between CNAME records in a response, this is detected and the `Deferred` returned by the lookup method fails with `ResolverError`.
Method	`test_filteredQuery`	`Resolver._query` accepts a `Query` instance and an address, issues the query, and returns a `Deferred` which fires with the response to the query. If a true value is passed for the `filter` parameter, the result is a three-tuple of lists of records.
Method	`test_followCanonicalName`	If no record of the requested type is included in a response, but a CNAME record for the query name is included, queries are made to resolve the value of the CNAME.
Method	`test_lookupAddress`	`root.Resolver.lookupAddress` looks up the A records for the specified hostname by first querying one of the root servers the resolver was created with and then following the authority delegations until a result is received.
Method	`test_lookupChecksClass`	If a response includes a record with a class different from the one in the query, it is ignored and lookup continues until a record with the right class is found.
Method	`test_lookupNameservers`	`Resolver.lookupNameservers` is like `Resolver.lookupAddress`, except it queries for NS records instead of A records.
Method	`test_missingGlue`	If an intermediate response includes no glue records for the authorities, separate queries are made to find those addresses.
Method	`test_missingName`	If a name is missing, `Resolver.lookupAddress` returns a `Deferred` which fails with `DNSNameError`.
Method	`test_returnCanonicalName`	If a CNAME record is encountered as the answer to a query for another record type, that record is returned as the answer.
Method	`test_unfilteredQuery`	Similar to `test_filteredQuery`, but for the case where a false value is passed for the `filter` parameter. In this case, the result is a `Message` instance.
Method	`_getResolver`	Create and return a new `root.Resolver` modified to resolve queries against the record data represented by `servers`.
Method	`_queryTest`	Invoke `Resolver._query` and verify that it sends the correct DNS query. Deliver a canned response to the query and return whatever the `Deferred` returned by `Resolver._query` fires with.
Method	`_respond`	Create a `Message` suitable for use as a response to a query.

Inherited from TestCase:

Method	`__call__`	Run the test. Should always do exactly the same thing as run().
Method	`__init__`	Construct an asynchronous test case for `methodName`.
Method	`addCleanup`	Extend the base cleanup feature with support for cleanup functions which return Deferreds.
Method	`assertFailure`	Fail if `deferred` does not errback with one of `expectedFailures`. Returns the original Deferred with callbacks added. You will need to return this Deferred from your test case.
Method	`deferRunCleanups`	Run any scheduled cleanups and report errors (if any) to the result. object.
Method	`deferSetUp`	Undocumented
Method	`deferTearDown`	Undocumented
Method	`deferTestMethod`	Undocumented
Method	`getSuppress`	Undocumented
Method	`getTimeout`	Returns the timeout value set on this test. Checks on the instance first, then the class, then the module, then packages. As soon as it finds something with a `timeout` attribute, returns that. Returns `util.DEFAULT_TIMEOUT_DURATION`...
Instance Variable	`timeout`	A real number of seconds. If set, the test will raise an error if it takes longer than `timeout` seconds. If not set, util.DEFAULT_TIMEOUT_DURATION is used.
Method	`_cbDeferTestMethod`	Undocumented
Method	`_classCleanUp`	Undocumented
Method	`_cleanUp`	Undocumented
Method	`_deprecateReactor`	Deprecate `iterate`, `crash` and `stop` on `reactor`. That is, each method is wrapped in a function that issues a deprecation warning, then calls the original.
Method	`_ebDeferSetUp`	Undocumented
Method	`_ebDeferTearDown`	Undocumented
Method	`_ebDeferTestMethod`	Undocumented
Method	`_makeReactorMethod`	Create a method which wraps the reactor method `name`. The new method issues a deprecation warning and calls the original.
Method	`_run`	Run a single method, either a test method or fixture.
Method	`_runFixturesAndTest`	Really run `setUp`, the test method, and `tearDown`. Any of these may return `defer.Deferred`s. After they complete, do some reactor cleanup.
Method	`_undeprecateReactor`	Restore the deprecated reactor methods. Undoes what `_deprecateReactor` did.
Method	`_wait`	Take a Deferred that only ever callbacks. Block until it happens.
Instance Variable	`_passed`	Undocumented
Instance Variable	`_reactorMethods`	Undocumented
Instance Variable	`_timedOut`	Undocumented

Inherited from SynchronousTestCase (via TestCase):

Method	`__eq__`	Override the comparison defined by the base TestCase which considers instances of the same class with the same _testMethodName to be equal. Since trial puts TestCase instances into a set, that definition of comparison makes it impossible to run the same test method twice...
Method	`__hash__`	Undocumented
Method	`callDeprecated`	Call a function that should have been deprecated at a specific version and in favor of a specific alternative, and assert that it was thusly deprecated.
Method	`flushLoggedErrors`	Remove stored errors received from the log.
Method	`flushWarnings`	Remove stored warnings from the list of captured warnings and return them.
Method	`getDeprecatedModuleAttribute`	Retrieve a module attribute which should have been deprecated, and assert that we saw the appropriate deprecation warning.
Method	`getSkip`	Return the skip reason set on this test, if any is set. Checks on the instance first, then the class, then the module, then packages. As soon as it finds something with a `skip` attribute, returns that in a tuple (...
Method	`getTodo`	Return a `Todo` object if the test is marked todo. Checks on the instance first, then the class, then the module, then packages. As soon as it finds something with a `todo` attribute, returns that. Returns ...
Method	`mktemp`	Create a new path name which can be used for a new file or directory.
Method	`patch`	Monkey patch an object for the duration of the test.
Method	`run`	Run the test case, storing the results in `result`.
Method	`runTest`	If no `methodName` argument is passed to the constructor, `run` will treat this method as the thing with the actual test inside.
Method	`shortDescription`	Undocumented
Instance Variable	`failureException`	An exception class, defaulting to `FailTest`. If the test method raises this exception, it will be reported as a failure, rather than an exception. All of the assertion methods raise this if the assertion fails.
Instance Variable	`skip`	`None` or a string explaining why this test is to be skipped. If defined, the test will not be run. Instead, it will be reported to the result object as 'skipped' (if the `TestResult` supports skipping).
Instance Variable	`suppress`	`None` or a list of tuples of `(args, kwargs)` to be passed to `warnings.filterwarnings`. Use these to suppress warnings raised in a test. Useful for testing deprecated code. See also `util.suppress`.
Instance Variable	`todo`	`None`, a string or a tuple of `(errors, reason)` where `errors` is either an exception class or an iterable of exception classes, and `reason` is a string. See `Todo` or `makeTodo` for more information.
Method	`_getSkipReason`	Return the reason to use for skipping a test method.
Method	`_getSuppress`	Returns any warning suppressions set for this test. Checks on the instance first, then the class, then the module, then packages. As soon as it finds something with a `suppress` attribute, returns that. ...
Method	`_installObserver`	Undocumented
Method	`_removeObserver`	Undocumented
Method	`_runCleanups`	Synchronously run any cleanups which have been added.
Instance Variable	`_cleanups`	Undocumented
Instance Variable	`_observer`	Undocumented
Instance Variable	`_parents`	Undocumented
Instance Variable	`_testMethodName`	Undocumented
Instance Variable	`_warnings`	Undocumented

Inherited from _Assertions (via TestCase, SynchronousTestCase):

Method	`assertAlmostEqual`	Fail if the two objects are unequal as determined by their difference rounded to the given number of decimal places (default 7) and comparing to zero.
Method	`assertApproximates`	Fail if `first` - `second` > `tolerance`
Method	`assertEqual`	Fail the test if `first` and `second` are not equal.
Method	`assertFalse`	Fail the test if `condition` evaluates to True.
Method	`assertIn`	Fail the test if `containee` is not found in `container`.
Method	`assertIs`	Fail the test if `first` is not `second`. This is an obect-identity-equality test, not an object equality (i.e. `__eq__`) test.
Method	`assertIsInstance`	Fail if `instance` is not an instance of the given class or of one of the given classes.
Method	`assertIsNot`	Fail the test if `first` is `second`. This is an obect-identity-equality test, not an object equality (i.e. `__eq__`) test.
Method	`assertNoResult`	Assert that `deferred` does not have a result at this point.
Method	`assertNotAlmostEqual`	Fail if the two objects are equal as determined by their difference rounded to the given number of decimal places (default 7) and comparing to zero.
Method	`assertNotEqual`	Fail the test if `first` == `second`.
Method	`assertNotIn`	Fail the test if `containee` is found in `container`.
Method	`assertNotIsInstance`	Fail if `instance` is an instance of the given class or of one of the given classes.
Method	`assertNotSubstring`	Fail if `astring` contains `substring`.
Method	`assertRaises`	Fail the test unless calling the function `f` with the given `args` and `kwargs` raises `exception`. The failure will report the traceback and call stack of the unexpected exception.
Method	`assertSubstring`	Fail if `substring` does not exist within `astring`.
Method	`assertTrue`	Fail the test if `condition` evaluates to False.
Method	`assertWarns`	Fail if the given function doesn't generate the specified warning when called. It calls the function, checks the warning, and forwards the result of the function if everything is fine.
Method	`fail`	Absolutely fail the test. Do not pass go, do not collect $200.
Method	`failureResultOf`	Return the current failure result of `deferred` or raise `self.failureException`.
Method	`successResultOf`	Return the current success result of `deferred` or raise `self.failureException`.

def test_answerless(self): (source) ¶

If a query is responded to with no answers or nameserver records, the Deferred returned by Resolver.lookupAddress fires with ResolverError.

def test_boundedQueries(self): (source) ¶

Resolver.lookupAddress won't issue more queries following delegations than the limit passed to its initializer.

def test_delegationLookupEmpty(self): (source) ¶

If there are no records in the response to a lookup of a delegation nameserver, the Deferred returned by Resolver.lookupAddress fires with ResolverError.

def test_delegationLookupError(self): (source) ¶

If there is an error resolving the nameserver in a delegation response, the Deferred returned by Resolver.lookupAddress fires with that error.

def test_detectCanonicalNameLoop(self): (source) ¶

If there is a cycle between CNAME records in a response, this is detected and the Deferred returned by the lookup method fails with ResolverError.

def test_filteredQuery(self): (source) ¶

Resolver._query accepts a Query instance and an address, issues the query, and returns a Deferred which fires with the response to the query. If a true value is passed for the filter parameter, the result is a three-tuple of lists of records.

def test_followCanonicalName(self): (source) ¶

If no record of the requested type is included in a response, but a CNAME record for the query name is included, queries are made to resolve the value of the CNAME.

def test_lookupAddress(self): (source) ¶

root.Resolver.lookupAddress looks up the A records for the specified hostname by first querying one of the root servers the resolver was created with and then following the authority delegations until a result is received.

def test_lookupChecksClass(self): (source) ¶

If a response includes a record with a class different from the one in the query, it is ignored and lookup continues until a record with the right class is found.

def test_lookupNameservers(self): (source) ¶

Resolver.lookupNameservers is like Resolver.lookupAddress, except it queries for NS records instead of A records.

def test_missingGlue(self): (source) ¶

If an intermediate response includes no glue records for the authorities, separate queries are made to find those addresses.

def test_missingName(self): (source) ¶

If a name is missing, Resolver.lookupAddress returns a Deferred which fails with DNSNameError.

def test_returnCanonicalName(self): (source) ¶

If a CNAME record is encountered as the answer to a query for another record type, that record is returned as the answer.

def test_unfilteredQuery(self): (source) ¶

Similar to test_filteredQuery, but for the case where a false value is passed for the filter parameter. In this case, the result is a Message instance.

def _getResolver(self, serverResponses, maximumQueries=10): (source) ¶

Create and return a new root.Resolver modified to resolve queries against the record data represented by servers.

Parameters
serverResponses	A mapping from dns server addresses to mappings. The inner mappings are from query two-tuples (name, type) to dictionaries suitable for use as **arguments to `_respond`. See that method for details.
maximumQueries	Undocumented

def _queryTest(self, filter): (source) ¶

Invoke Resolver._query and verify that it sends the correct DNS query. Deliver a canned response to the query and return whatever the Deferred returned by Resolver._query fires with.

Parameters
filter	The value to pass for the `filter` parameter to `Resolver._query`.

def _respond(self, answers=[], authority=[], additional=[], rCode=OK): (source) ¶

Create a Message suitable for use as a response to a query.

Parameters
answers	A `list` of two-tuples giving data for the answers section of the message. The first element of each tuple is a name for the `RRHeader`. The second element is the payload.
authority	A `list` like `answers`, but for the authority section of the response.
additional	A `list` like `answers`, but for the additional section of the response.
rCode	The response code the message will be created with.
Returns
A new `Message` initialized with the given values.