Add sub-events and relative date settings (#503)

* Data model

* little crud

* SubEventItemForm etc

* Drop SubEventItem.active, quota editor

* Fix failing tests

* First frontend stuff

* Addons form stuff

* Quota calculation

* net price display on EventIndex

* Add tests, solve some bugs

* Correct quota selection in more places, consolidate pricing logic

* Fix failing quota tests

* Fix TypeError

* Add tests for checkout

* Fixed a bug in QuotaForm

* Prevent immutable cart if a quota was removed from an item

* Add tests for pricing

* Handle waiting list

* Filter in check-in list

* Fixed import lost in rebase

* Fix waiting list widget

* Voucher management

* Voucher redemption

* Fix broken tests

* Add subevents to OrderChangeManager

* Create a subevent during event creation

* Fix bulk voucher creation

* Introduce subevent.active

* Copy from for subevents

* Show active in list

* ICal download for subevents

* Check start and end of presale

* Failing tests / show cart logic

* Test

* Rebase migrations

* REST API integration of sub-events

* Integrate quota calculation into the traditional quota form

* Make subevent argument to add_position optional

* Log-display foo

* pretixdroid and subevents

* Filter by subevent

* Add more tests

* Some mor tests

* Rebase fixes

* More tests

* Relative dates

* Restrict selection in relative datetime widgets

* Filter subevent list

* Re-label has_subevents

* Rebase fixes, subevents in calendar view

* Performance and caching issues

* Refactor calendar templates

* Permission tests

* Calendar fixes and month selection

* subevent selection

* Rename subevents to dates

* Add tests for calendar views

src/tests/plugins/test_sendmail.py

@@ -174,3 +174,42 @@ def test_sendmail_multi_locales(logged_in_client, sendmail_url, event, item):
     assert response.status_code == 200
     assert 'Benutzer' in response.rendered_content
     assert 'Test nachricht' in response.rendered_content
+
+
+@pytest.mark.django_db
+def test_sendmail_subevents(logged_in_client, sendmail_url, event, order):
+    event.has_subevents = True
+    event.save()
+    se1 = event.subevents.create(name='Subevent FOO', date_from=now())
+    se2 = event.subevents.create(name='Bar', date_from=now())
+    op = order.positions.last()
+    op.subevent = se1
+    op.save()
+
+    djmail.outbox = []
+    response = logged_in_client.post(sendmail_url,
+                                     {'sendto': 'n',
+                                      'subject_0': 'Test subject',
+                                      'message_0': 'This is a test file for sending mails.',
+                                      'subevent': se1.pk
+                                      },
+                                     follow=True)
+    assert response.status_code == 200
+    assert 'alert-success' in response.rendered_content
+    assert len(djmail.outbox) == 1
+
+    djmail.outbox = []
+    response = logged_in_client.post(sendmail_url,
+                                     {'sendto': 'n',
+                                      'subject_0': 'Test subject',
+                                      'message_0': 'This is a test file for sending mails.',
+                                      'subevent': se2.pk
+                                      },
+                                     follow=True)
+    assert len(djmail.outbox) == 0
+
+    url = sendmail_url + 'history/'
+    response = logged_in_client.get(url)
+
+    assert response.status_code == 200
+    assert 'Subevent FOO' in response.rendered_content