change(aurweb): add parallel tests and improve aurweb.db

This change utilizes pytest-xdist to perform a multiproc test
run and reworks aurweb.db's code. We no longer use a global
engine, session or Session, but we now use a memo of engines
and sessions as they are requested, based on the PYTEST_CURRENT_TEST
environment variable, which is available during testing.

Additionally, this change strips several SQLite components
out of the Python code-base.

SQLite is still compatible with PHP and sharness tests, but
not with our FastAPI implementation.

More changes:
------------
- Remove use of aurweb.db.session global in other code.
- Use new aurweb.db.name() dynamic db name function in env.py.
- Added 'addopts' to pytest.ini which utilizes multiprocessing.
    - Highly recommended to leave this be or modify `-n auto` to
      `-n {cpu_threads}` where cpu_threads is at least 2.

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

test/test_tu_vote.py

@@ -4,53 +4,48 @@ import pytest
 
 from sqlalchemy.exc import IntegrityError
 
-from aurweb.db import create, query, rollback
-from aurweb.models.account_type import AccountType
+from aurweb import db
+from aurweb.models.account_type import TRUSTED_USER_ID
 from aurweb.models.tu_vote import TUVote
 from aurweb.models.tu_voteinfo import TUVoteInfo
 from aurweb.models.user import User
-from aurweb.testing import setup_test_db
 
 user = tu_voteinfo = None
 
 
 @pytest.fixture(autouse=True)
-def setup():
+def setup(db_test):
     global user, tu_voteinfo
 
-    setup_test_db("Users", "TU_VoteInfo", "TU_Votes")
-
-    tu_type = query(AccountType,
-                    AccountType.AccountType == "Trusted User").first()
-    user = create(User, Username="test", Email="test@example.org",
-                  RealName="Test User", Passwd="testPassword",
-                  AccountType=tu_type)
-
     ts = int(datetime.utcnow().timestamp())
-    tu_voteinfo = create(TUVoteInfo,
-                         Agenda="Blah blah.",
-                         User=user.Username,
-                         Submitted=ts, End=ts + 5,
-                         Quorum=0.5,
-                         Submitter=user)
+    with db.begin():
+        user = db.create(User, Username="test", Email="test@example.org",
+                         RealName="Test User", Passwd="testPassword",
+                         AccountTypeID=TRUSTED_USER_ID)
+
+        tu_voteinfo = db.create(TUVoteInfo,
+                                Agenda="Blah blah.",
+                                User=user.Username,
+                                Submitted=ts, End=ts + 5,
+                                Quorum=0.5,
+                                Submitter=user)
 
 
 def test_tu_vote_creation():
-    tu_vote = create(TUVote, User=user, VoteInfo=tu_voteinfo)
+    with db.begin():
+        tu_vote = db.create(TUVote, User=user, VoteInfo=tu_voteinfo)
+
     assert tu_vote.VoteInfo == tu_voteinfo
     assert tu_vote.User == user
-
     assert tu_vote in user.tu_votes
     assert tu_vote in tu_voteinfo.tu_votes
 
 
 def test_tu_vote_null_user_raises_exception():
     with pytest.raises(IntegrityError):
-        create(TUVote, VoteInfo=tu_voteinfo)
-    rollback()
+        TUVote(VoteInfo=tu_voteinfo)
 
 
 def test_tu_vote_null_voteinfo_raises_exception():
     with pytest.raises(IntegrityError):
-        create(TUVote, User=user)
-    rollback()
+        TUVote(User=user)