[1.5.x] Fixed #19546 - ensure that deprecation warnings are shown during tests

refs #18985

django/test/simple.py

@@ -1,3 +1,4 @@
+import logging
 import unittest as real_unittest
 
 from django.conf import settings
@@ -365,7 +366,19 @@ class DjangoTestSuiteRunner(object):
         self.setup_test_environment()
         suite = self.build_suite(test_labels, extra_tests)
         old_config = self.setup_databases()
+        if self.verbosity > 0:
+            # ensure that deprecation warnings are displayed during testing
+            # the following state is assumed:
+            # logging.capturewarnings is true
+            # a "default" level warnings filter has been added for
+            # DeprecationWarning. See django.conf.LazySettings._configure_logging
+            logger = logging.getLogger('py.warnings')
+            handler = logging.StreamHandler()
+            logger.addHandler(handler)
         result = self.run_suite(suite)
+        if self.verbosity > 0:
+            # remove the testing-specific handler
+            logger.removeHandler(handler)
         self.teardown_databases(old_config)
         self.teardown_test_environment()
         return self.suite_result(suite, result)

tests/regressiontests/logging_tests/tests.py

@@ -142,24 +142,31 @@ class WarningLoggerTests(TestCase):
     and captured to the logging system
     """
     def setUp(self):
+        # this convoluted setup is to avoid printing this deprecation to
+        # stderr during test running - as the test runner forces deprecations
+        # to be displayed at the global py.warnings level
         self.logger = logging.getLogger('py.warnings')
-        self.old_stream = self.logger.handlers[0].stream
+        self.outputs = []
+        self.old_streams = []
+        for handler in self.logger.handlers:
+            self.old_streams.append(handler.stream)
+            self.outputs.append(StringIO())
+            handler.stream = self.outputs[-1]
 
     def tearDown(self):
-        self.logger.handlers[0].stream = self.old_stream
+        for i, handler in enumerate(self.logger.handlers):
+            self.logger.handlers[i].stream = self.old_streams[i]
 
     @override_settings(DEBUG=True)
     def test_warnings_capture(self):
-        output = StringIO()
-        self.logger.handlers[0].stream = output
         warnings.warn('Foo Deprecated', DeprecationWarning)
-        self.assertTrue('Foo Deprecated' in force_text(output.getvalue()))
+        output = force_text(self.outputs[0].getvalue())
+        self.assertTrue('Foo Deprecated' in output)
 
     def test_warnings_capture_debug_false(self):
-        output = StringIO()
-        self.logger.handlers[0].stream = output
         warnings.warn('Foo Deprecated', DeprecationWarning)
-        self.assertFalse('Foo Deprecated' in force_text(output.getvalue()))
+        output = force_text(self.outputs[0].getvalue())
+        self.assertFalse('Foo Deprecated' in output)
 
 
 class CallbackFilterTest(TestCase):

tests/regressiontests/test_runner/deprecation_app/models.py

@@ -0,0 +1,3 @@
+from django.db import models
+
+# Create your models here.

tests/regressiontests/test_runner/deprecation_app/tests.py

@@ -0,0 +1,9 @@
+import warnings
+
+from django.test import TestCase
+
+class DummyTest(TestCase):
+    def test_warn(self):
+        warnings.warn("warning from test", DeprecationWarning)
+
+

tests/regressiontests/test_runner/tests.py

@@ -279,6 +279,25 @@ class DummyBackendTest(unittest.TestCase):
             db.connections = old_db_connections
 
 
+class DeprecationDisplayTest(AdminScriptTestCase):
+    # tests for 19546
+    def setUp(self):
+        settings = {'INSTALLED_APPS': '("regressiontests.test_runner.deprecation_app",)' }
+        self.write_settings('settings.py', sdict=settings)
+
+    def tearDown(self):
+        self.remove_settings('settings.py')
+
+    def test_runner_deprecation_verbosity_default(self):
+        args = ['test', '--settings=regressiontests.settings']
+        out, err = self.run_django_admin(args)
+        self.assertTrue("DeprecationWarning: warning from test" in err)
+
+    def test_runner_deprecation_verbosity_zero(self):
+        args = ['test', '--settings=regressiontests.settings', '--verbosity=0']
+        out, err = self.run_django_admin(args)
+        self.assertFalse("DeprecationWarning: warning from test" in err)
+
 class AutoIncrementResetTest(TransactionTestCase):
     """
     Here we test creating the same model two times in different test methods,