Fixed #25163 -- Fixed exception handling in nested test client requests.

tests/test_client/tests.py

@@ -640,6 +640,14 @@ class ClientTest(TestCase):
         self.assertEqual(mail.outbox[1].to[0], 'second@example.com')
         self.assertEqual(mail.outbox[1].to[1], 'third@example.com')
 
+    def test_exception_following_nested_client_request(self):
+        """
+        A nested test client request shouldn't clobber exception signals from
+        the outer client request.
+        """
+        with self.assertRaisesMessage(Exception, 'exception message'):
+            self.client.get('/nesting_exception_view/')
+
 
 @override_settings(
     MIDDLEWARE_CLASSES=['django.middleware.csrf.CsrfViewMiddleware'],

tests/test_client/urls.py

@@ -31,6 +31,7 @@ urlpatterns = [
     url(r'^broken_view/$', views.broken_view),
     url(r'^mail_sending_view/$', views.mail_sending_view),
     url(r'^mass_mail_sending_view/$', views.mass_mail_sending_view),
+    url(r'^nesting_exception_view/$', views.nesting_exception_view),
     url(r'^django_project_redirect/$', views.django_project_redirect),
 
     url(r'^accounts/login/$', auth_views.login, {'template_name': 'login.html'}),

tests/test_client/views.py

@@ -11,6 +11,7 @@ from django.http import (
 )
 from django.shortcuts import render_to_response
 from django.template import Context, Template
+from django.test import Client
 from django.utils.decorators import method_decorator
 from django.utils.six.moves.urllib.parse import urlencode
 
@@ -309,5 +310,15 @@ def mass_mail_sending_view(request):
     return HttpResponse("Mail sent")
 
 
+def nesting_exception_view(request):
+    """
+    A view that uses a nested client to call another view and then raises an
+    exception.
+    """
+    client = Client()
+    client.get('/get_view/')
+    raise Exception('exception message')
+
+
 def django_project_redirect(request):
     return HttpResponseRedirect('https://www.djangoproject.com/')