Do not manipulate sys.path in tests

Author: akx

tests/database_test.py

@@ -1,11 +1,8 @@
 import datetime
 import ipaddress
-import sys
 import unittest
 from unittest.mock import MagicMock, patch
 
-sys.path.append("..")
-
 import maxminddb
 
 import geoip2.database

tests/models_test.py

@@ -1,10 +1,7 @@
 import ipaddress
-import sys
 import unittest
 from typing import ClassVar
 
-sys.path.append("..")
-
 import geoip2.models
 
 

tests/webservice_test.py

@@ -3,7 +3,6 @@
 import asyncio
 import copy
 import ipaddress
-import sys
 import unittest
 from abc import ABC, abstractmethod
 from collections import defaultdict
@@ -13,7 +12,6 @@
 import pytest_httpserver
 from pytest_httpserver import HeaderValueMatcher
 
-sys.path.append("..")
 import geoip2
 from geoip2.errors import (
     AddressNotFoundError,