py.test seems not to be really supported about flask-fixtures HOT 3 OPEN

from server.models import db as sqlalchemy_db

@pytest.fixture()
def seeded_db(app):
    from flask_fixtures import load_fixtures_from_file

    with app.app_context():
        sqlalchemy_db.drop_all()
        sqlalchemy_db.create_all()
		sqlalchemy_db.session.rollback()

        ... # prepares seed_files_names and seed_dir_paths

        for filename in seed_files_names:
            load_fixtures_from_file(sqlalchemy_db, filename, seed_dir_paths)

        yield sqlalchemy_db

        sqlalchemy_db.session.expunge_all()
        sqlalchemy_db.drop_all()

def test_seeded_db(seeded_db):
    """
    Test that seeded database works
	We have a User table and a user.json seeding fixture file. So there should be some users in table.
    """
    assert User.query.count() > 0
    # now remove all user
    User.query.delete()
    seeded_db.session.commit()
    assert User.query.count() == 0


def test_seeded_db_rollback(seeded_db):
    """
    Test that the previous test did not affect the seeded database
    """
    assert User.query.count() > 0