Apply ruff fixes; mostly removing unused imports

doc/conf.py

@@ -10,7 +10,6 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import sys, os
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the

testtools/matchers/__init__.py

@@ -128,7 +128,7 @@
 
 # XXX: These are not explicitly included in __all__.  It's unclear how much of
 # the public interface they really are.
-from ._impl import (
+from ._impl import (  # noqa: F401
     Matcher,
     Mismatch,
     MismatchError,

testtools/matchers/_warnings.py

@@ -13,8 +13,6 @@
 from ._higherorder import (
     AfterPreprocessing,
     Annotate,
-    MatchesAll,
-    Not,
     )
 from ._impl import Mismatch
 

testtools/run.py

@@ -8,7 +8,6 @@
  $ python -m testtools.run testtools.tests.test_suite
 """
 
-import argparse
 from functools import partial
 import os.path
 import sys

testtools/tests/test_content.py

@@ -5,7 +5,7 @@
 import tempfile
 import unittest
 
-from testtools import TestCase, skipUnless
+from testtools import TestCase
 from testtools.compat import (
     _b,
     )

testtools/tests/twistedsupport/test_deferred.py

@@ -51,5 +51,5 @@ def test_failure(self):
 
 
 def test_suite():
-    from unittest import TestLoader, TestSuite
+    from unittest import TestLoader
     return TestLoader().loadTestsFromName(__name__)

testtools/tests/twistedsupport/test_matchers.py

@@ -199,5 +199,5 @@ def test_no_result_fails(self):
 
 
 def test_suite():
-    from unittest import TestLoader, TestSuite
+    from unittest import TestLoader
     return TestLoader().loadTestsFromName(__name__)

testtools/tests/twistedsupport/test_runtest.py

@@ -21,10 +21,8 @@
     Is,
     KeysEqual,
     MatchesDict,
-    MatchesException,
     MatchesListwise,
     Not,
-    Raises,
     )
 from testtools.runtest import RunTest
 from testtools.testresult.doubles import ExtendedTestResult
@@ -875,7 +873,7 @@ def check_result(failure):
 class TestRunWithLogObservers(NeedsTwistedTestCase):
 
     def test_restores_observers(self):
-        from testtools.deferredruntest import run_with_log_observers
+        from testtools.twistedsupport._runtest import run_with_log_observers
         from twisted.python import log
         # Make sure there's at least one observer.  This reproduces bug
         # #926189.
@@ -1015,7 +1013,7 @@ def test_something(self):
 
 
 def test_suite():
-    from unittest import TestLoader, TestSuite
+    from unittest import TestLoader
     return TestLoader().loadTestsFromName(__name__)
 
 

testtools/utils.py

@@ -9,5 +9,4 @@
 warnings.warn("Please import iterate_tests from testtools.testsuite - "
     "testtools.utils is deprecated.", DeprecationWarning, stacklevel=2)
 
-from testtools.testsuite import iterate_tests