Added error messages and tests to event settings pages

src/pretix/control/views/event.py

@@ -262,6 +262,7 @@ class EventSettingsFormView(EventPermissionRequiredMixin, FormView):
             messages.success(self.request, _('Your changes have been saved.'))
             return redirect(self.get_success_url())
         else:
+            messages.error(self.request, _('We could not save your changes. See below for details.'))
             return self.get(request)
 
 
@@ -310,6 +311,7 @@ class DisplaySettings(EventSettingsFormView):
                                              'active.'))
             return redirect(self.get_success_url())
         else:
+            messages.error(self.request, _('We could not save your changes. See below for details.'))
             return self.get(request)
 
 
@@ -355,6 +357,7 @@ class MailSettings(EventSettingsFormView):
                 messages.success(self.request, _('Your changes have been saved.'))
             return redirect(self.get_success_url())
         else:
+            messages.error(self.request, _('We could not save your changes. See below for details.'))
             return self.get(request)
 
 

src/pretix/testutils/mock.py

@@ -0,0 +1,10 @@
+from contextlib import contextmanager
+
+from pytest_mock import MockFixture
+
+
+@contextmanager
+def mocker_context():
+    result = MockFixture()
+    yield result
+    result.stopall()