To test the postgresql part of the code you can use the environment variables like this:
env SQLUTIL_TEST_PG_USER=skoposov SQLUTIL_TEST_PG_HOST=localhost SQLUTIL_TEST_PG_DB=test SQLUTIL_TEST_PG_PASS="" pytest
assuming you have a local postgresql database called test. If the database listens on a non-standard port, you can also set SQLUTIL_TEST_PG_PORT (the default is 5432).