Move the remaining test os.path calls to pathlib

The three os.path.abspath assertions in test_find_nvidia_binaries.py become
str(...absolute()), and the os.path.isdir in test_utils_find_sub_dirs.py
becomes Path.is_dir(). import os stays in the binaries test for os.sep.

Author: LeSingh1

cuda_pathfinder/tests/test_find_nvidia_binaries.py

@@ -571,7 +571,7 @@ def test_find_binary_first_matching_dir_wins(monkeypatch, mocker):
     result = find_nvidia_binary_utility("nvcc")
 
     # Conda comes before CUDA_HOME, so the Conda hit wins and CUDA_HOME is never probed.
-    assert result == os.path.abspath(conda_nvcc)
+    assert result == str(conda_nvcc.absolute())
     assert checked == [site_dir / "nvcc", conda_nvcc]
 
 
@@ -592,7 +592,7 @@ def test_find_binary_ctk_root_canary_fallback(monkeypatch, mocker):
 
     result = find_nvidia_binary_utility("nvcc")
 
-    assert result == os.path.abspath(ctk_nvcc)
+    assert result == str(ctk_nvcc.absolute())
     canary_mock.assert_called_once_with()
     # No earlier trusted dirs existed, so the only probe is the canary bin dir.
     assert checked == [ctk_nvcc]
@@ -637,7 +637,7 @@ def test_find_binary_canary_not_consulted_when_found_earlier(monkeypatch, mocker
 
     result = find_nvidia_binary_utility("nvcc")
 
-    assert result == os.path.abspath(conda_nvcc)
+    assert result == str(conda_nvcc.absolute())
     canary_mock.assert_not_called()