Add test of 'Error creating symlink' behavior.

Author: samsrabin

tests/test_relink.py

@@ -345,6 +345,33 @@ def mock_stat(path, *args, **kwargs):
         assert "Error" not in caplog.text
         assert "disappearing.txt" not in caplog.text
 
+    def test_error_creating_symlink(self, temp_dirs, caplog):
+        """Test error message when symlink creation fails."""
+        source_dir, target_dir = temp_dirs
+        username = os.environ["USER"]
+
+        # Create source file
+        source_file = os.path.join(source_dir, "test.txt")
+        target_file = os.path.join(target_dir, "test.txt")
+
+        with open(source_file, "w", encoding="utf-8") as f:
+            f.write("source")
+        with open(target_file, "w", encoding="utf-8") as f:
+            f.write("target")
+
+        # Mock os.symlink to raise an error
+        def mock_symlink(src, dst):
+            raise OSError("Simulated symlink error")
+
+        with patch("os.symlink", side_effect=mock_symlink):
+            # Run the function
+            with caplog.at_level(logging.INFO):
+                relink.find_and_replace_owned_files(source_dir, target_dir, username)
+
+            # Check error message
+            assert "Error creating symlink" in caplog.text
+            assert source_file in caplog.text
+
 
 class TestParseArguments:
     """Test suite for parse_arguments function."""