test: fix issue with local dev tests for email settings

in my case i had wuttasync installed, which provides email settings,
but the test setup does not configure default import/export handlers,
which prevents those email settings from loading correctly.

so restrict to some "basic" email settings and avoid anything else, to
prevent the issue

tests/views/test_email.py

@@ -2,12 +2,13 @@
 
 from unittest.mock import patch
 
-from wuttjamaican.email import EmailSetting
+from wuttjamaican.email import EmailSetting, EmailHandler
 
 import colander
 from pyramid.httpexceptions import HTTPNotFound
 from pyramid.response import Response
 
+from wuttaweb import emails as wuttaweb_emails
 from wuttaweb.views import email as mod
 from wuttaweb.testing import WebTestCase
 
@@ -23,6 +24,12 @@ class TestEmailSettingViews(WebTestCase):
     def test_get_grid_data(self):
         self.config.setdefault("wutta.email.default.sender", "test@example.com")
         view = self.make_view()
+
+        # nb. avoid issues with arbitrary installed packages
+        email_modules = [wuttaweb_emails]
+        with patch.object(
+            EmailHandler, "get_email_modules", return_value=email_modules
+        ):
             data = view.get_grid_data()
             self.assertIsInstance(data, list)
             self.assertTrue(data)  # 1+ items
@@ -37,6 +44,12 @@ class TestEmailSettingViews(WebTestCase):
     def test_configure_grid(self):
         self.config.setdefault("wutta.email.default.sender", "test@example.com")
         view = self.make_view()
+
+        # nb. avoid issues with arbitrary installed packages
+        email_modules = [wuttaweb_emails]
+        with patch.object(
+            EmailHandler, "get_email_modules", return_value=email_modules
+        ):
             grid = view.make_model_grid()
             self.assertIn("key", grid.searchable_columns)
             self.assertIn("subject", grid.searchable_columns)