In tests, leave SQLAlchemy in charge of establishing engine connection

conftest.py

@@ -3,17 +3,12 @@
 import sqlalchemy as sa
 import pytest
 
-
-@pytest.fixture
-def engine(postgresql):
-    """Create an SQLAlchemy engine with a disposable PostgreSQL database."""
-    return sa.create_engine('postgresql://', poolclass=sa.pool.StaticPool,
-                            creator=lambda: postgresql)
+from healpix_alchemy.tests.benchmarks.conftest import engine  # noqa: F401
 
 
 @pytest.fixture(autouse=True)
 def add_mock_create_engine(monkeypatch, request):
     """Monkey patch sqlalchemy.create_engine for doctests in README.md."""
     if request.node.name == 'README.md':
-        engine = request.getfixturevalue('engine')
-        monkeypatch.setattr(sa, 'create_engine', Mock(return_value=engine))
+        db_engine = request.getfixturevalue('engine')
+        monkeypatch.setattr(sa, 'create_engine', Mock(return_value=db_engine))

healpix_alchemy/tests/benchmarks/conftest.py

@@ -1,14 +1,24 @@
 import numpy as np
 import sqlalchemy as sa
 import pytest
+from pytest_postgresql.janitor import DatabaseJanitor
 
 from . import data, models
 
 
 @pytest.fixture
-def engine(postgresql):
-    return sa.create_engine('postgresql://', poolclass=sa.pool.StaticPool,
-                            creator=lambda: postgresql)
+def engine(postgresql_proc):
+    """Create an SQLAlchemy engine with a disposable PostgreSQL database."""
+    host = postgresql_proc.host
+    port = postgresql_proc.port
+    user = postgresql_proc.user
+    password = postgresql_proc.password
+    db = postgresql_proc.dbname
+    version = postgresql_proc.version
+
+    url = sa.engine.URL.create('postgresql', user, password, host, port, db)
+    with DatabaseJanitor(user, host, port, db, version, password):
+        yield sa.create_engine(url)
 
 
 @pytest.fixture

pyproject.toml

@@ -23,11 +23,12 @@ sqlalchemy = ">=1.4"
 astroquery = "*"
 numpy = "*"
 pandas = "*"
+psycopg = {version="*", extras=["binary"]}  # for pytest-postgresql
 psycopg2-binary = "*"
 pytest = "*"
 pytest-benchmark = "*"
 pytest-doctestplus = "*"
-pytest-postgresql = "<4.0.0"  # pytest-postgresql 4.0.0 uses psycopg3, but sqlalchemy does not yet support it
+pytest-postgresql = "*"
 
 [tool.pytest.ini_options]
 addopts = "--doctest-glob *.md"