Time machine mode [Z#23129725] (#3961)

Allows organizers to test their shop as if it were a different date and time.

Implemented using a time_machine_now() function which is used instead of regular now(), which can overlay the real date time with a value from a ContextVar, assigned from a session value in EventMiddleware.

For more information, see doc/development/implementation/timemachine.rst

---------

Co-authored-by: Richard Schreiber <schreiber@rami.io>
Co-authored-by: Raphael Michel <michel@rami.io>

src/tests/multidomain/test_templatetag.py

@@ -41,6 +41,8 @@ def env():
 
 TEMPLATE_FRONT_PAGE = Template("{% load eventurl %} {% eventurl event 'presale:event.index' %}")
 TEMPLATE_KWARGS = Template("{% load eventurl %} {% eventurl event 'presale:event.checkout' step='payment' %}")
+TEMPLATE_ABSEVENTURL = Template("{% load eventurl %} {% abseventurl event 'presale:event.checkout' step='payment' %}")
+TEMPLATE_ABSMAINURL = Template("{% load eventurl %} {% absmainurl 'control:event.settings' organizer=event.organizer.slug event=event.slug %}")
 
 
 @pytest.mark.django_db
@@ -77,6 +79,40 @@ def test_event_custom_domain_kwargs(env):
     assert rendered == 'http://foobar/2015/checkout/payment/'
 
 
+@pytest.mark.django_db
+def test_abseventurl_event_main_domain(env):
+    rendered = TEMPLATE_ABSEVENTURL.render(Context({
+        'event': env[1]
+    })).strip()
+    assert rendered == 'http://example.com/mrmcd/2015/checkout/payment/'
+
+
+@pytest.mark.django_db
+def test_abseventurl_event_custom_domain(env):
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    rendered = TEMPLATE_ABSEVENTURL.render(Context({
+        'event': env[1]
+    })).strip()
+    assert rendered == 'http://foobar/2015/checkout/payment/'
+
+
+@pytest.mark.django_db
+def test_absmainurl_main_domain(env):
+    rendered = TEMPLATE_ABSMAINURL.render(Context({
+        'event': env[1]
+    })).strip()
+    assert rendered == 'http://example.com/control/event/mrmcd/2015/settings/'
+
+
+@pytest.mark.django_db
+def test_absmainurl_custom_domain(env):
+    KnownDomain.objects.create(domainname='foobar', organizer=env[0])
+    rendered = TEMPLATE_ABSMAINURL.render(Context({
+        'event': env[1]
+    })).strip()
+    assert rendered == 'http://example.com/control/event/mrmcd/2015/settings/'
+
+
 @pytest.mark.django_db
 def test_only_kwargs(env):
     with pytest.raises(TemplateSyntaxError):