Fix test_oclint_plist_cleanup to change to tmpdir before cleanup

OCLintCmd.cleanup_files() uses os.getcwd() to list files, so the test
must chdir to the temp directory before calling it. Without this,
os.getcwd() fails with FileNotFoundError when the current directory
doesn't exist or has been deleted.

Changes:
- Save original cwd
- chdir to tmpdir before calling cleanup_files()
- Restore original cwd in finally block

Fixes Ubuntu CI test failure.

Author: pocc

tests/test_edge_cases.py

@@ -269,24 +269,29 @@ def test_oclint_version_detection(self):
     @pytest.mark.skipif(os.name == "nt", reason="OCLint not available on Windows")
     def test_oclint_plist_cleanup(self):
         """Test that OCLint cleans up generated .plist files."""
+        original_cwd = os.getcwd()
         with tempfile.TemporaryDirectory() as tmpdir:
-            test_file = os.path.join(tmpdir, "test.c")
-            with open(test_file, "w") as f:
-                f.write("int main() { return 0; }\n")
+            try:
+                os.chdir(tmpdir)
+                test_file = os.path.join(tmpdir, "test.c")
+                with open(test_file, "w") as f:
+                    f.write("int main() { return 0; }\n")
 
-            plist_file = os.path.join(tmpdir, "test.plist")
-            with open(plist_file, "w") as f:
-                f.write("fake plist content\n")
+                plist_file = os.path.join(tmpdir, "test.plist")
+                with open(plist_file, "w") as f:
+                    f.write("fake plist content\n")
 
-            existing_files = os.listdir(tmpdir)
-            assert "test.plist" in existing_files
+                existing_files = os.listdir(tmpdir)
+                assert "test.plist" in existing_files
 
-            # Simulate cleanup
-            OCLintCmd.cleanup_files(existing_files)
+                # Simulate cleanup - cleanup_files uses os.getcwd()
+                OCLintCmd.cleanup_files(existing_files)
 
-            # In actual use, cleanup removes plist files created by oclint
-            # Here we just test the method exists and can be called
-            assert hasattr(OCLintCmd, "cleanup_files")
+                # In actual use, cleanup removes plist files created by oclint
+                # Here we just test the method exists and can be called
+                assert hasattr(OCLintCmd, "cleanup_files")
+            finally:
+                os.chdir(original_cwd)
 
 
 class TestIncludeWhatYouUse: