spark: Fix test script to use absolute paths for portable testing

wizard-work/spark/test_line_counter.py

@@ -3,6 +3,9 @@
 
 import subprocess
 import sys
+import os
+
+BASE_DIR = os.path.dirname(os.path.abspath(__file__))
 
 def run_test(cmd, expected, description):
     """Run a test command and verify output."""
@@ -19,21 +22,21 @@ def run_test(cmd, expected, description):
 
 # Test CSV mode with known data
 test_csv_pass = run_test(
-    ['python3', 'line_counter.py', 'test_data.csv', 'csv'],
+    ['python3', f'{BASE_DIR}/line_counter.py', f'{BASE_DIR}/test_data.csv', 'csv'],
     5,
     "CSV count mode (5 items)"
 )
 
 # Test count mode with known lines
 test_count_pass = run_test(
-    ['python3', 'line_counter.py', 'test_log.txt', 'count'],
+    ['python3', f'{BASE_DIR}/line_counter.py', f'{BASE_DIR}/test_log.txt', 'count'],
     10,
     "Line count mode (10 lines)"
 )
 
 # Test error handling for non-existent file
 result = subprocess.run(
-    ['python3', 'line_counter.py', 'nonexistent.txt', 'count'],
+    ['python3', f'{BASE_DIR}/line_counter.py', f'{BASE_DIR}/nonexistent.txt', 'count'],
     capture_output=True,
     text=True
 )