force the driver level on the bulk insert PG tests

this changes to use the psycopg2 dialect in all cases
even if the default for postgresql changes.

this is to prepare for SQLAlchemy moving to psycopg as the
default dialect. I had hoped to move these tests to use psycopg
and test for bind casts, however, we are still running tests against
SQLAlchemy 1.4 which does not have the psycopg dialect.   so stick with
psycopg2 for now.

also adds an rmtree for build/ as apparently pip install is re-using
this directory if it's there from a previous build, and the
artfacts left over from the gerrit for "plugins" is interfering with
the stubs generation.   We really should find a way to make the stub
generation / testing more robust as it breaks much too easily and
without an easy way to tell why.

Change-Id: Ibdab43a2cda5ec4f697d35c8a5f090aa56492703

Author: zzzeek

noxfile.py

@@ -104,6 +104,7 @@ def _tests(
 
     # for sqlalchemy == "default", the alembic install will install
     # current released SQLAlchemy version as a dependency
+    shutil.rmtree("build/", ignore_errors=True)
     if coverage:
         session.install("-e", ".")
     else:
@@ -201,6 +202,7 @@ def _tests(
 def mypy_check(session: nox.Session) -> None:
     """Run mypy type checking."""
 
+    shutil.rmtree("build/", ignore_errors=True)
     session.install(*nox.project.dependency_groups(pyproject, "mypy"))
 
     session.install("-e", ".")

setup.cfg

@@ -29,6 +29,7 @@ sqlite=sqlite:///:memory:
 sqlite_file=sqlite:///querytest.db
 postgresql=postgresql://scott:tiger@127.0.0.1:5432/test
 psycopg=postgresql+psycopg://scott:tiger@127.0.0.1:5432/test
+psycopg2=postgresql+psycopg2://scott:tiger@127.0.0.1:5432/test
 mysql=mysql://scott:tiger@127.0.0.1:3306/test?charset=utf8mb4
 mariadb=mariadb://scott:tiger@127.0.0.1:3306/test?charset=utf8mb4
 mssql=mssql+pyodbc://scott:tiger^5HHH@mssql2022:1433/test?driver=ODBC+Driver+18+for+SQL+Server&TrustServerCertificate=yes&Encrypt=Optional

tests/test_bulk_insert.py

@@ -72,7 +72,7 @@ def test_bulk_insert(self):
         )
 
     def test_bulk_insert_wrong_cols(self):
-        context = op_fixture("postgresql")
+        context = op_fixture("postgresql+psycopg2")
         t1 = table(
             "ins_table",
             column("id", Integer),
@@ -92,14 +92,14 @@ def test_bulk_insert_no_rows(self):
         context.assert_()
 
     def test_bulk_insert_pg(self):
-        context = self._test_bulk_insert("postgresql", False)
+        context = self._test_bulk_insert("postgresql+psycopg2", False)
         context.assert_(
             "INSERT INTO ins_table (id, v1, v2) "
             "VALUES (%(id)s, %(v1)s, %(v2)s)"
         )
 
     def test_bulk_insert_pg_single(self):
-        context = self._test_bulk_insert_single("postgresql", False)
+        context = self._test_bulk_insert_single("postgresql+psycopg2", False)
         context.assert_(
             "INSERT INTO ins_table (id, v1, v2) "
             "VALUES (%(id)s, %(v1)s, %(v2)s)"