fix: update test assertion to match POSIX-normalized paths in Jest config

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: mohamedashrraf222

tests/test_languages/test_javascript_test_runner.py

@@ -122,7 +122,7 @@ def test_behavioral_tests_creates_runtime_config_for_external_tests(self):
                 runtime_configs = [f for f in get_created_config_files() if "codeflash.runtime" in f.name]
                 assert len(runtime_configs) == 1, f"Expected 1 runtime config, got {len(runtime_configs)}"
                 config_content = runtime_configs[0].read_text(encoding="utf-8")
-                assert str(external_path) in config_content, "Runtime config should contain external test directory"
+                assert external_path.as_posix() in config_content, "Runtime config should contain external test directory"
 
             clear_created_config_files()