twisted.names.test.test_rootresolve.RootResolverTests

Tests for twisted.names.root.Resolver.

Method	test_filteredQuery	No summary
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	test_lookupAddress	No summary
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_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_answerless	If a query is responded to with no answers or nameserver records, 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_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_lookupNameservers	`Resolver.lookupNameservers` is like `Resolver.lookupAddress`, except it queries for NS records instead of A records.
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_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_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_boundedQueries	`Resolver.lookupAddress` won't issue more queries following delegations than the limit passed to its initializer.
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.
Method	_getResolver	Create and return a new `root.Resolver` modified to resolve queries against the record data represented by `servers`.

Inherited from TestCase:

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	__init__	Construct an asynchronous test case for `methodName`.
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	__call__	Run the test. Should always do exactly the same thing as run().
Method	deferSetUp	Undocumented
Method	deferTestMethod	Undocumented
Method	deferTearDown	Undocumented
Method	deferRunCleanups	Run any scheduled cleanups and report errors (if any to the result object.
Method	addCleanup	Extend the base cleanup feature with support for cleanup functions which return Deferreds.
Method	getSuppress	Undocumented
Method	getTimeout	No summary
Method	_run	Run a single method, either a test method or fixture.
Method	_ebDeferSetUp	Undocumented
Method	_cbDeferTestMethod	Undocumented
Method	_ebDeferTestMethod	Undocumented
Method	_ebDeferTearDown	Undocumented
Method	_cbDeferRunCleanups	Undocumented
Method	_cleanUp	Undocumented
Method	_classCleanUp	Undocumented
Method	_makeReactorMethod	Create a method which wraps the reactor method `name`. The new method issues a deprecation warning and calls the original.
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	_undeprecateReactor	Restore the deprecated reactor methods. Undoes what `_deprecateReactor` did.
Method	_runCleanups	Run the cleanups added with `addCleanup` in order.
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	_wait	Take a Deferred that only ever callbacks. Block until it happens.

Inherited from SynchronousTestCase (via TestCase):

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	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.
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`.
Method	__eq__	No summary
Method	__ne__	Undocumented
Method	__hash__	Undocumented
Method	shortDescription	Undocumented
Method	getSkip	No summary
Method	getTodo	No summary
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	run	Run the test case, storing the results in `result`.
Method	patch	Monkey patch an object for the duration of the test.
Method	flushLoggedErrors	Remove stored errors received from the log.
Method	flushWarnings	Remove stored warnings from the list of captured warnings and return them.
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	mktemp	Create a new path name which can be used for a new file or directory.
Method	_getSuppress	No summary
Method	_getSkipReason	Return the reason to use for skipping a test method.
Method	_installObserver	Undocumented
Method	_removeObserver	Undocumented

Inherited from _Assertions (via TestCase, SynchronousTestCase):

Method	fail	Absolutely fail the test. Do not pass go, do not collect $200.
Method	assertFalse	Fail the test if `condition` evaluates to True.
Method	assertTrue	Fail the test if `condition` evaluates to False.
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	assertEqual	Fail the test if `first` and `second` are not equal.
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	assertIsNot	Fail the test if `first` is `second`. This is an obect-identity-equality test, not an object equality (i.e. `__eq__`) test.
Method	assertNotEqual	Fail the test if `first` == `second`.
Method	assertIn	Fail the test if `containee` is not found in `container`.
Method	assertNotIn	Fail the test if `containee` is found in `container`.
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	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	assertSubstring	Fail if `substring` does not exist within `astring`.
Method	assertNotSubstring	Fail if `astring` contains `substring`.
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	assertIsInstance	Fail if `instance` is not an instance of the given class or of one of the given classes.
Method	assertNotIsInstance	Fail if `instance` is an instance of the given class or of one of the given classes.
Method	successResultOf	Return the current success result of `deferred` or raise `self.failureException`.
Method	failureResultOf	Return the current failure result of `deferred` or raise `self.failureException`.
Method	assertNoResult	Assert that `deferred` does not have a result at this point.
Method	assertRegex	Fail the test if a `regexp` search of `text` fails.

def _queryTest(self, filter):

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 test_filteredQuery(self):

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_unfilteredQuery(self):

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

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.

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

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.

def test_lookupAddress(self):

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):

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_missingGlue(self):

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

def test_missingName(self):

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

def test_answerless(self):

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

def test_delegationLookupError(self):

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

def test_delegationLookupEmpty(self):

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_lookupNameservers(self):

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

def test_returnCanonicalName(self):

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_followCanonicalName(self):

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_detectCanonicalNameLoop(self):

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_boundedQueries(self):

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

API Documentation for twisted, generated by pydoctor at 2020-03-25 17:34:30.

twisted.names.test.test_rootresolve.RootResolverTests(TestCase) class documentation

`twisted.names.test.test_rootresolve.RootResolverTests(TestCase)` class documentation