Fairy Arceus is not a default form.

pokedex/data/csv/pokemon_forms.csv

@@ -801,7 +801,7 @@ id,identifier,form_identifier,pokemon_id,introduced_in_version_group_id,is_defau
 10082,kyurem-black,black,10022,14,1,0,0,2,736
 10083,kyurem-white,white,10023,14,1,0,0,3,737
 10084,keldeo-resolute,resolute,10024,14,1,0,0,2,739
-10085,arceus-fairy,fairy,493,15,1,0,0,2,570
+10085,arceus-fairy,fairy,493,15,0,0,0,2,570
 10086,vivillon-icy-snow,icy-snow,666,15,0,0,0,1,760
 10087,vivillon-polar,polar,666,15,0,0,0,2,761
 10088,vivillon-tundra,tundra,666,15,0,0,0,3,762

pokedex/tests/test_database_sanity.py

@@ -1,8 +1,9 @@
 
 import pytest
 
-from sqlalchemy.orm import aliased, joinedload
+from sqlalchemy.orm import aliased, joinedload, lazyload
 from sqlalchemy.orm.exc import NoResultFound
+from sqlalchemy.sql import func
 
 from pokedex.db import connect, tables, util
 
@@ -64,3 +65,35 @@ def test_unique_form_order():
                         form.order,
                         species_by_form_order[form.order].name,
                         form.species.name))
+
+def test_default_forms():
+    """Check that each pokemon has one default form and each species has one
+    default pokemon."""
+
+    session = connect()
+
+    q = session.query(tables.Pokemon)
+    q = q.join(tables.PokemonForm)
+    q = q.filter(tables.PokemonForm.is_default==True)
+    q = q.options(lazyload('*'))
+    q = q.group_by(tables.Pokemon)
+    q = q.add_columns(func.count(tables.PokemonForm.id))
+
+    for pokemon, num_default_forms in q:
+        if num_default_forms == 0:
+            raise AssertionError("pokemon %s has no default forms" % pokemon.name)
+        elif num_default_forms > 1:
+            raise AssertionError("pokemon %s has %d default forms" % (pokemon.name, num_default_forms))
+
+    q = session.query(tables.PokemonSpecies)
+    q = q.join(tables.Pokemon)
+    q = q.filter(tables.Pokemon.is_default==True)
+    q = q.options(lazyload('*'))
+    q = q.group_by(tables.PokemonSpecies)
+    q = q.add_columns(func.count(tables.Pokemon.id))
+
+    for species, num_default_pokemon in q:
+        if num_default_pokemon == 0:
+            raise AssertionError("species %s has no default pokemon" % species.name)
+        elif num_default_pokemon > 1:
+            raise AssertionError("species %s has %d default pokemon" % (species.name, num_default_pokemon))