Move testdummy plugin to the test directory

src/pretix/plugins/testdummy/__init__.py

@@ -1,17 +0,0 @@
-from django.apps import AppConfig
-from pretix.base.plugins import PluginType
-
-
-class TestDummyApp(AppConfig):
-    name = 'pretix.plugins.testdummy'
-    verbose_name = '.testdummy'
-
-    class PretixPluginMeta:
-        type = PluginType.RESTRICTION
-        name = '.testdummy'
-        version = '1.0.0'
-
-    def ready(self):
-        from . import signals  # NOQA
-
-default_app_config = 'pretix.plugins.testdummy.TestDummyApp'

src/pretix/plugins/testdummy/signals.py

@@ -1,15 +0,0 @@
-from django.dispatch import receiver
-
-from pretix.base.signals import determine_availability
-
-
-@receiver(determine_availability)
-def availability_handler(sender, **kwargs):
-    kwargs['sender'] = sender
-    if sender.settings.testdummy_available is not None:
-        variations = kwargs['variations']
-        variations = [d.copy() for d in variations]
-        for v in variations:
-            v['available'] = (sender.settings.testdummy_available == 'yes')
-        return variations
-    return []