diff --git a/py-polars/polars/utils/udfs.py b/py-polars/polars/utils/udfs.py
index 0b3d0decf4b8..8340d28715a8 100644
--- a/py-polars/polars/utils/udfs.py
+++ b/py-polars/polars/utils/udfs.py
@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import dis
+import inspect
 import re
 import sys
 import warnings
@@ -10,10 +11,9 @@
 from dis import get_instructions
 from inspect import signature
 from itertools import count, zip_longest
+from pathlib import Path
 from typing import TYPE_CHECKING, Any, Callable, Iterator, Literal, NamedTuple, Union
 
-from polars.utils.various import get_all_caller_variables
-
 if TYPE_CHECKING:
     from dis import Instruction
 
@@ -101,6 +101,25 @@ class OpNames:
 }
 
 
+def _get_all_caller_variables() -> dict[str, Any]:
+    """Get all local and global variables from caller's frame."""
+    pkg_dir = Path(__file__).parent.parent
+
+    # https://stackoverflow.com/questions/17407119/python-inspect-stack-is-slow
+    frame = inspect.currentframe()
+    n = 0
+    while frame:
+        fname = inspect.getfile(frame)
+        if fname.startswith(str(pkg_dir)):
+            frame = frame.f_back
+            n += 1
+        else:
+            break
+    if frame is None:
+        return {}
+    return {**frame.f_locals, **frame.f_globals}
+
+
 class BytecodeParser:
     """Introspect UDF bytecode and determine if we can rewrite as native expression."""
 
@@ -591,7 +610,7 @@ def _rewrite_lookups(
             argvals=[],
         ):
             inst1, inst2 = matching_instructions[:2]
-            variables = get_all_caller_variables()
+            variables = _get_all_caller_variables()
             if isinstance(variables.get(argval := inst1.argval, None), dict):
                 argval = f"map_dict({inst1.argval})"
             else:
diff --git a/py-polars/polars/utils/various.py b/py-polars/polars/utils/various.py
index f5368dec0fd3..2032dc8e15c1 100644
--- a/py-polars/polars/utils/various.py
+++ b/py-polars/polars/utils/various.py
@@ -358,20 +358,19 @@ def __repr__(self) -> str:
 
 def find_stacklevel() -> int:
     """
-    Find the first place in the stack that is not inside polars (tests notwithstanding).
+    Find the first place in the stack that is not inside polars.
 
     Taken from:
     https://github.com/pandas-dev/pandas/blob/ab89c53f48df67709a533b6a95ce3d911871a0a8/pandas/util/_exceptions.py#L30-L51
     """
     pkg_dir = Path(pl.__file__).parent
-    test_dir = pkg_dir / "tests"
 
     # https://stackoverflow.com/questions/17407119/python-inspect-stack-is-slow
     frame = inspect.currentframe()
     n = 0
     while frame:
         fname = inspect.getfile(frame)
-        if fname.startswith(str(pkg_dir)) and not fname.startswith(str(test_dir)):
+        if fname.startswith(str(pkg_dir)):
             frame = frame.f_back
             n += 1
         else:
@@ -454,23 +453,3 @@ def in_terminal_that_supports_colour() -> bool:
             )
         ) or os.environ.get("PYCHARM_HOSTED") == "1"
     return False
-
-
-def get_all_caller_variables() -> dict[str, Any]:
-    """Get all local and global variables from caller's frame."""
-    pkg_dir = Path(pl.__file__).parent
-    test_dir = pkg_dir / "tests"
-
-    # https://stackoverflow.com/questions/17407119/python-inspect-stack-is-slow
-    frame = inspect.currentframe()
-    n = 0
-    while frame:
-        fname = inspect.getfile(frame)
-        if fname.startswith(str(pkg_dir)) and not fname.startswith(str(test_dir)):
-            frame = frame.f_back
-            n += 1
-        else:
-            break
-    if frame is None:
-        return {}
-    return {**frame.f_locals, **frame.f_globals}
diff --git a/py-polars/tests/test_udfs.py b/py-polars/tests/test_udfs.py
index 90cc58536c29..68044b89d4fc 100644
--- a/py-polars/tests/test_udfs.py
+++ b/py-polars/tests/test_udfs.py
@@ -140,7 +140,15 @@
 def test_bytecode_parser_expression(
     col: str, func: Callable[[Any], Any], expected: str
 ) -> None:
-    udfs = pytest.importorskip("udfs")
+    try:
+        import udfs  # type: ignore[import]
+    except ModuleNotFoundError as exc:
+        assert "No module named 'udfs'" in str(exc)  # noqa: PT017
+        # Skip test if udfs can't be imported because it's not in the path.
+        # Prefer this over importorskip, so that if `udfs` can't be
+        # imported for some other reason, then the test
+        # won't be skipped.
+        return
     bytecode_parser = udfs.BytecodeParser(func, apply_target="expr")
     result = bytecode_parser.to_expression(col)
     assert result == expected
@@ -151,5 +159,13 @@ def test_bytecode_parser_expression(
     NOOP_TEST_CASES,
 )
 def test_bytecode_parser_expression_noop(func: Callable[[Any], Any]) -> None:
-    udfs = pytest.importorskip("udfs")
+    try:
+        import udfs
+    except ModuleNotFoundError as exc:
+        assert "No module named 'udfs'" in str(exc)  # noqa: PT017
+        # Skip test if udfs can't be imported because it's not in the path.
+        # Prefer this over importorskip, so that if `udfs` can't be
+        # imported for some other reason, then the test
+        # won't be skipped.
+        return
     assert not udfs.BytecodeParser(func, apply_target="expr").can_rewrite()