Create PostgreSQL database for SQLAlchemy tests

Previously, the test suite expected the existence of an
`alch_factory_boy_test` database. In order to facilitate local
development, create it when the test suite runs, and destroy it
afterwards.

.github/workflows/test.yml

@@ -39,7 +39,6 @@ jobs:
           - 5432:5432
         env:
           POSTGRES_PASSWORD: password
-          POSTGRES_DB: alch_factory_boy_test
 
     env:
       TOXENV: ${{ matrix.tox-environment }}

tests/test_alchemy.py

@@ -10,6 +10,8 @@
 except ImportError:
     raise unittest.SkipTest("sqlalchemy tests disabled.")
 
+from sqlalchemy_utils import create_database, database_exists, drop_database
+
 import factory
 from factory.alchemy import SQLAlchemyModelFactory
 
@@ -75,6 +77,17 @@ class Meta:
     text = factory.Sequence(lambda n: "text%s" % n)
 
 
+if models.USING_POSTGRES:
+    # sqlite test database gets created/destroyed automatically, postgres does not.
+
+    def setUpModule():
+        if not database_exists(models.engine.url):
+            create_database(models.engine.url)
+
+    def tearDownModule():
+        drop_database(models.engine.url)
+
+
 class TransactionTestCase(unittest.TestCase):
     def setUp(self):
         models.Base.metadata.create_all(models.engine)

tox.ini

@@ -32,6 +32,7 @@ passenv =
     POSTGRES_DATABASE
 deps =
     alchemy: SQLAlchemy
+    alchemy: sqlalchemy_utils
     mongo: mongoengine
     django{22,32,40,main}: Pillow
     django22: Django>=2.2,<2.3