Fix tests running via PyCharm

Would've been better to get the path via `requests.config.rootdir`,
but it looks like a pain to inject the `requests` fixture here.

Signed-off-by: Stavros Ntentos <133706+stdedos@users.noreply.github.com>

Author: stdedos

tests/base_tester.py

@@ -1,6 +1,7 @@
 import os
 import sys
 from abc import ABC
+from pathlib import Path
 from pprint import pprint
 from typing import Any, Dict, List
 
@@ -21,6 +22,11 @@
 pylint_pytest.checkers.fixture.FILE_NAME_PATTERNS = ("*",)
 
 
+def get_test_root_path() -> Path:
+    """Assumes ``base_tester.py`` is at ``<root>/tests``."""
+    return Path(__file__).parent
+
+
 class BasePytestTester(ABC):
     CHECKER_CLASS = BaseChecker
     IMPACTED_CHECKER_CLASSES: List[BaseChecker] = []
@@ -41,7 +47,10 @@ def run_linter(self, enable_plugin):
         # pylint: disable-next=protected-access
         target_test_file = sys._getframe(1).f_code.co_name.replace("test_", "", 1)
         file_path = os.path.join(
-            os.getcwd(), "tests", "input", self.MSG_ID, target_test_file + ".py"
+            get_test_root_path(),
+            "input",
+            self.MSG_ID,
+            target_test_file + ".py",
         )
 
         with open(file_path) as fin:

tests/base_tester_test.py

@@ -1,9 +1,14 @@
 import pytest
-from base_tester import BasePytestTester
+from base_tester import BasePytestTester, get_test_root_path
 
 # pylint: disable=unused-variable
 
 
+def test_get_test_root_path():
+    assert get_test_root_path().name == "tests"
+    assert (get_test_root_path() / "input").is_dir()
+
+
 def test_init_subclass_valid_msg_id():
     some_string = "some_string"