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/base/test_pricing.py

@@ -0,0 +1,195 @@
+from decimal import Decimal
+
+import pytest
+from django.utils.timezone import now
+
+from pretix.base.models import Event, Organizer
+from pretix.base.models.items import SubEventItem, SubEventItemVariation
+from pretix.base.services.pricing import get_price
+
+
+@pytest.fixture
+def event():
+    o = Organizer.objects.create(name='Dummy', slug='dummy')
+    event = Event.objects.create(
+        organizer=o, name='Dummy', slug='dummy',
+        date_from=now()
+    )
+    return event
+
+
+@pytest.fixture
+def item(event):
+    return event.items.create(name='Ticket', default_price=Decimal('23.00'))
+
+
+@pytest.fixture
+def variation(item):
+    return item.variations.create(value='Premium', default_price=None)
+
+
+@pytest.fixture
+def voucher(event):
+    return event.vouchers.create()
+
+
+@pytest.fixture
+def subevent(event):
+    event.has_subevents = True
+    event.save()
+    return event.subevents.create(name='Foobar', date_from=now())
+
+
+@pytest.mark.django_db
+def test_base_item_default(item):
+    assert get_price(item) == Decimal('23.00')
+
+
+@pytest.mark.django_db
+def test_base_item_subevent_no_entry(item, subevent):
+    assert get_price(item, subevent=subevent) == Decimal('23.00')
+
+
+@pytest.mark.django_db
+def test_base_item_subevent_no_override(item, subevent):
+    SubEventItem.objects.create(item=item, subevent=subevent, price=None)
+    assert get_price(item, subevent=subevent) == Decimal('23.00')
+
+
+@pytest.mark.django_db
+def test_base_item_subevent_override(item, subevent):
+    SubEventItem.objects.create(item=item, subevent=subevent, price=Decimal('24.00'))
+    assert get_price(item, subevent=subevent) == Decimal('24.00')
+
+
+@pytest.mark.django_db
+def test_variation_with_default_item_price(item, variation):
+    assert get_price(item, variation=variation) == Decimal('23.00')
+
+
+@pytest.mark.django_db
+def test_variation_with_specific_price(item, variation):
+    variation.default_price = Decimal('24.00')
+    assert get_price(item, variation=variation) == Decimal('24.00')
+
+
+@pytest.mark.django_db
+def test_variation_with_default_subevent_and_default_price(item, subevent, variation):
+    SubEventItemVariation.objects.create(variation=variation, subevent=subevent, price=None)
+    assert get_price(item, variation=variation, subevent=subevent) == Decimal('23.00')
+
+
+@pytest.mark.django_db
+def test_variation_with_subevent_and_default_price(item, subevent, variation):
+    SubEventItemVariation.objects.create(variation=variation, subevent=subevent, price=Decimal('24.00'))
+    assert get_price(item, variation=variation, subevent=subevent) == Decimal('24.00')
+
+
+@pytest.mark.django_db
+def test_variation_with_no_subevent_and_specific_price(item, subevent, variation):
+    variation.default_price = Decimal('24.00')
+    assert get_price(item, variation=variation, subevent=subevent) == Decimal('24.00')
+
+
+@pytest.mark.django_db
+def test_variation_with_default_subevent_and_specific_price(item, subevent, variation):
+    variation.default_price = Decimal('24.00')
+    SubEventItemVariation.objects.create(variation=variation, subevent=subevent, price=None)
+    assert get_price(item, variation=variation, subevent=subevent) == Decimal('24.00')
+
+
+@pytest.mark.django_db
+def test_variation_with_subevent_and_specific_price(item, subevent, variation):
+    variation.default_price = Decimal('24.00')
+    SubEventItemVariation.objects.create(variation=variation, subevent=subevent, price=Decimal('26.00'))
+    assert get_price(item, variation=variation, subevent=subevent) == Decimal('26.00')
+
+
+@pytest.mark.django_db
+def test_voucher_no_override(item, subevent, voucher):
+    assert get_price(item, subevent=subevent, voucher=voucher) == Decimal('23.00')
+
+
+@pytest.mark.django_db
+def test_voucher_set_price(item, subevent, voucher):
+    voucher.price_mode = 'set'
+    voucher.value = Decimal('12.00')
+    assert get_price(item, subevent=subevent, voucher=voucher) == Decimal('12.00')
+
+
+@pytest.mark.django_db
+def test_voucher_subtract(item, subevent, voucher):
+    voucher.price_mode = 'subtract'
+    voucher.value = Decimal('12.00')
+    assert get_price(item, subevent=subevent, voucher=voucher) == Decimal('11.00')
+
+
+@pytest.mark.django_db
+def test_voucher_percent(item, subevent, voucher):
+    voucher.price_mode = 'percent'
+    voucher.value = Decimal('10.00')
+    assert get_price(item, subevent=subevent, voucher=voucher) == Decimal('20.70')
+
+
+@pytest.mark.django_db
+def test_free_price_ignored_if_disabled(item):
+    assert get_price(item, custom_price=Decimal('42.00')) == Decimal('23.00')
+
+
+@pytest.mark.django_db
+def test_free_price_ignored_if_lower(item):
+    item.free_price = True
+    assert get_price(item, custom_price=Decimal('12.00')) == Decimal('23.00')
+
+
+@pytest.mark.django_db
+def test_free_price_ignored_if_lower_than_voucher(item, voucher):
+    voucher.price_mode = 'set'
+    voucher.value = Decimal('50.00')
+    assert get_price(item, voucher=voucher, custom_price=Decimal('40.00')) == Decimal('50.00')
+
+
+@pytest.mark.django_db
+def test_free_price_ignored_if_lower_than_subevent(item, subevent):
+    item.free_price = True
+    SubEventItem.objects.create(item=item, subevent=subevent, price=Decimal('50.00'))
+    assert get_price(item, subevent=subevent, custom_price=Decimal('40.00')) == Decimal('50.00')
+
+
+@pytest.mark.django_db
+def test_free_price_ignored_if_lower_than_variation(item, variation):
+    variation.default_price = Decimal('50.00')
+    item.free_price = True
+    assert get_price(item, variation=variation, custom_price=Decimal('40.00')) == Decimal('50.00')
+
+
+@pytest.mark.django_db
+def test_free_price_accepted(item):
+    item.free_price = True
+    assert get_price(item, custom_price=Decimal('42.00')) == Decimal('42.00')
+
+
+@pytest.mark.django_db
+def test_free_price_string(item):
+    item.free_price = True
+    assert get_price(item, custom_price='42,00') == Decimal('42.00')
+
+
+@pytest.mark.django_db
+def test_free_price_float(item):
+    item.free_price = True
+    assert get_price(item, custom_price=42.00) == Decimal('42.00')
+
+
+@pytest.mark.django_db
+def test_free_price_limit(item):
+    item.free_price = True
+    with pytest.raises(ValueError):
+        get_price(item, custom_price=Decimal('200000000'))
+
+
+@pytest.mark.django_db
+def test_free_price_net(item):
+    item.free_price = True
+    item.tax_rate = 19
+    assert get_price(item, custom_price=Decimal('100.00'), custom_price_is_net=True) == Decimal('119.00')