add aurweb.db.session

+ Added Session class and global session object to aurweb.db,
  these are sessions created by sqlalchemy ORM's sessionmaker
  and will allow us to use declarative/imperative models.

Signed-off-by: Kevin Morris <kevr@0cost.org>

test/test_asgi.py

@@ -0,0 +1,29 @@
+import http
+import os
+
+from unittest import mock
+
+import pytest
+
+from fastapi import HTTPException
+
+import aurweb.asgi
+import aurweb.config
+
+
+@pytest.mark.asyncio
+async def test_asgi_startup_exception(monkeypatch):
+    with mock.patch.dict(os.environ, {"AUR_CONFIG": "conf/config.defaults"}):
+        aurweb.config.rehash()
+        with pytest.raises(Exception):
+            await aurweb.asgi.app_startup()
+    aurweb.config.rehash()
+
+
+@pytest.mark.asyncio
+async def test_asgi_http_exception_handler():
+    exc = HTTPException(status_code=422, detail="EXCEPTION!")
+    phrase = http.HTTPStatus(exc.status_code).phrase
+    response = await aurweb.asgi.http_exception_handler(None, exc)
+    assert response.body.decode() == \
+        f"<h1>{exc.status_code} {phrase}</h1><p>{exc.detail}</p>"