Fixed #27035 -- Eased changing settings.DEBUG for DiscoverRunner.

django/test/runner.py

@@ -360,7 +360,7 @@ class DiscoverRunner(object):
 
     def __init__(self, pattern=None, top_level=None, verbosity=1,
                  interactive=True, failfast=False, keepdb=False,
-                 reverse=False, debug_sql=False, parallel=0,
+                 reverse=False, debug_mode=False, debug_sql=False, parallel=0,
                  tags=None, exclude_tags=None, **kwargs):
 
         self.pattern = pattern
@@ -370,6 +370,7 @@ class DiscoverRunner(object):
         self.failfast = failfast
         self.keepdb = keepdb
         self.reverse = reverse
+        self.debug_mode = debug_mode
         self.debug_sql = debug_sql
         self.parallel = parallel
         self.tags = set(tags or [])
@@ -413,7 +414,7 @@ class DiscoverRunner(object):
 
     def setup_test_environment(self, **kwargs):
         setup_test_environment()
-        settings.DEBUG = False
+        settings.DEBUG = self.debug_mode
         unittest.installHandler()
 
     def build_suite(self, test_labels=None, extra_tests=None, **kwargs):

docs/releases/1.11.txt

@@ -259,6 +259,10 @@ Tests
 * Added :meth:`.DiscoverRunner.get_test_runner_kwargs` to allow customizing the
   keyword arguments passed to the test runner.
 
+* Added the ``debug_mode`` keyword argument to
+  :class:`~django.test.runner.DiscoverRunner` to make it easier to customize
+  the :setting:`DEBUG` setting when running tests.
+
 URLs
 ~~~~
 

docs/topics/testing/advanced.txt

@@ -427,7 +427,7 @@ behavior. This class defines the ``run_tests()`` entry point, plus a
 selection of other methods that are used to by ``run_tests()`` to set up,
 execute and tear down the test suite.
 
-.. class:: DiscoverRunner(pattern='test*.py', top_level=None, verbosity=1, interactive=True, failfast=False, keepdb=False, reverse=False, debug_sql=False, **kwargs)
+.. class:: DiscoverRunner(pattern='test*.py', top_level=None, verbosity=1, interactive=True, failfast=False, keepdb=False, reverse=False, debug_mode=False, debug_sql=False, **kwargs)
 
     ``DiscoverRunner`` will search for tests in any file matching ``pattern``.
 
@@ -458,6 +458,9 @@ execute and tear down the test suite.
     and have side effects. :ref:`Grouping by test class <order-of-tests>` is
     preserved when using this option.
 
+    ``debug_mode`` specifies what the :setting:`DEBUG` setting should be
+    set to prior to running tests.
+
     If ``debug_sql`` is ``True``, failing test cases will output SQL queries
     logged to the :ref:`django.db.backends logger <django-db-logger>` as well
     as the traceback. If ``verbosity`` is ``2``, then queries in all tests are
@@ -473,6 +476,10 @@ execute and tear down the test suite.
     custom arguments by calling ``parser.add_argument()`` inside the method, so
     that the :djadmin:`test` command will be able to use those arguments.
 
+    .. versionadded:: 1.11
+
+        The ``debug_mode`` keyword argument was added.
+
 Attributes
 ~~~~~~~~~~
 
@@ -526,7 +533,7 @@ Methods
 
     Sets up the test environment by calling
     :func:`~django.test.utils.setup_test_environment` and setting
-    :setting:`DEBUG` to ``False``.
+    :setting:`DEBUG` to ``self.debug_mode`` (defaults to ``False``).
 
 .. method:: DiscoverRunner.build_suite(test_labels, extra_tests=None, **kwargs)
 

tests/test_runner/test_discover_runner.py

@@ -20,6 +20,10 @@ def change_cwd(directory):
 
 class DiscoverRunnerTest(TestCase):
 
+    def test_init_debug_mode(self):
+        runner = DiscoverRunner()
+        self.assertFalse(runner.debug_mode)
+
     def test_dotted_test_module(self):
         count = DiscoverRunner().build_suite(
             ["test_discovery_sample.tests_sample"],