add test_initdb.py

IMPORTANT: This test completely wipes out the database it's using.
Make sure you've got AUR_CONFIG set to a test database configuration!
Signed-off-by: Kevin Morris <kevr@0cost.org>

test/test_initdb.py

+import pytest
+
+import aurweb.config
+import aurweb.db
+import aurweb.initdb
+
+from aurweb.models.account_type import AccountType
+from aurweb.schema import metadata
+from aurweb.testing import setup_test_db
+
+
+@pytest.fixture(autouse=True)
+def setup():
+    setup_test_db()
+
+    tables = metadata.tables.keys()
+    for table in tables:
+        aurweb.db.session.execute(f"DROP TABLE IF EXISTS {table}")
+
+
+def test_run():
+    class Args:
+        use_alembic = True
+        verbose = False
+    aurweb.initdb.run(Args())
+    assert aurweb.db.session.query(AccountType).filter(
+        AccountType.AccountType == "User").first() is not None