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* `AsyncTestCase` and `AsyncHTTPTestCase`: Subclasses of unittest.TestCase
with additional support for testing asynchronous (`.IOLoop`-based) code.
* `ExpectLog`: Make test logs less spammy.
* `main()`: A simple test runner (wrapper around unittest.main()) with support
for the tornado.autoreload module to rerun the tests when code changes.
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.. versionchanged:: 4.4
Always binds to ``127.0.0.1`` without resolving the name
``localhost``.
.. versionchanged:: 6.2
Added optional ``address`` argument to
override the default "127.0.0.1".
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