Extend the decorator to take kwargs and pass them on.

Documentation, and rename to grammatically correct run_test_with.

testtools/__init__.py

@@ -11,7 +11,7 @@ __all__ = [
     'MultipleExceptions',
     'MultiTestResult',
     'PlaceHolder',
-    'run_tests_with',
+    'run_test_with',
     'TestCase',
     'TestResult',
     'TextTestResult',
@@ -34,7 +34,7 @@ from testtools.testcase import (
     PlaceHolder,
     TestCase,
     clone_test_with_new_id,
-    run_tests_with,
+    run_test_with,
     skip,
     skipIf,
     skipUnless,

testtools/testcase.py

@@ -6,7 +6,7 @@ __metaclass__ = type
 __all__ = [
     'clone_test_with_new_id',
     'MultipleExceptions',
-    'run_tests_with',
+    'run_test_with',
     'skip',
     'skipIf',
     'skipUnless',
@@ -62,9 +62,25 @@ except ImportError:
         """
 
 
-def run_tests_with(test_runner):
+def run_test_with(test_runner, **kwargs):
+    """Decorate a test as using a specific `RunTest`.
+
+    e.g.
+      @run_test_with(CustomRunner, timeout=42)
+      def test_foo(self):
+          self.assertTrue(True)
+
+    :param test_runner: A `RunTest` factory that takes a test case and an
+        optional list of exception handlers.  See `RunTest`.
+    :param **kwargs: Keyword arguments to pass on as extra arguments to
+        `test_runner`.
+    :return: A decorator to be used for marking a test as needing a special
+        runner.
+    """
+    def make_test_runner(case, handlers=None):
+        return test_runner(case, handlers=handlers, **kwargs)
     def decorator(f):
-        f._run_tests_with = test_runner
+        f._run_test_with = make_test_runner
         return f
     return decorator
 
@@ -109,7 +125,7 @@ class TestCase(unittest.TestCase):
         # TestCase is safe to use with clone_test_with_new_id.
         self.__details = None
         test_method = self._get_test_method()
-        self.__RunTest = getattr(test_method, '_run_tests_with', runTest)
+        self.__RunTest = getattr(test_method, '_run_test_with', runTest)
         self.__exception_handlers = []
         self.exception_handlers = [
             (self.skipException, self._report_skip),

testtools/tests/test_runtest.py

@@ -4,7 +4,7 @@
 
 from testtools import (
     ExtendedToOriginalDecorator,
-    run_tests_with,
+    run_test_with,
     RunTest,
     TestCase,
     TestResult,
@@ -208,8 +208,9 @@ class TestTestCaseSupportForRunTest(TestCase):
         self.assertThat(from_run_test, Is(CustomRunTest.marker))
 
     def test_decorator_for_run_test(self):
+        # Individual test methods can be marked as needing a special runner.
         class SomeCase(TestCase):
-            @run_tests_with(CustomRunTest)
+            @run_test_with(CustomRunTest)
             def test_foo(self):
                 pass
         result = TestResult()
@@ -217,6 +218,26 @@ class TestTestCaseSupportForRunTest(TestCase):
         from_run_test = case.run(result)
         self.assertThat(from_run_test, Is(CustomRunTest.marker))
 
+    def test_extended_decorator_for_run_test(self):
+        # Individual test methods can be marked as needing a special runner.
+        # Extra arguments can be passed to the decorator which will then be
+        # passed on to the RunTest object.
+        marker = object()
+        class FooRunTest(RunTest):
+            def __init__(self, case, handlers=None, bar=None):
+                super(FooRunTest, self).__init__(case, handlers)
+                self.bar = bar
+            def run(self, result=None):
+                return self.bar
+        class SomeCase(TestCase):
+            @run_test_with(FooRunTest, bar=marker)
+            def test_foo(self):
+                pass
+        result = TestResult()
+        case = SomeCase('test_foo')
+        from_run_test = case.run(result)
+        self.assertThat(from_run_test, Is(marker))
+
 
 def test_suite():
     from unittest import TestLoader