update: test has update walker feature

jaclang/tests/test_language.py

@@ -954,14 +954,60 @@ def test_list_methods(self) -> None:
 
     def test_walker_dynamic_update(self) -> None:
         """Test dynamic update of a walker during runtime."""
+        session = self.fixture_abs_path("bar_walk.session")
+        bar_file_path = self.fixture_abs_path("bar.jac")
         captured_output = io.StringIO()
         sys.stdout = captured_output
-
-        cli.run(
-            filename=self.fixture_abs_path("walker_reload/foo.jac"),
+        cli.enter(
+            filename=bar_file_path,
+            session=session,
+            entrypoint="bar_walk",
+            args=[],
         )
         sys.stdout = sys.__stdout__
         stdout_value = captured_output.getvalue()
-        print(f"Stdout: {stdout_value}")
-        expected_output = "bar_walk has been updated with new behavior!"
+        expected_output = "Created 5 items."
         self.assertIn(expected_output, stdout_value.split("\n"))
+        # Define the new behavior to be added
+        new_behavior = """
+        # New behavior added during runtime
+        can end with `root exit {
+            "bar_walk has been updated with new behavior!" |> print;
+            disengage;
+            }
+        }
+        """
+
+        # Backup the original file content
+        with open(bar_file_path, "r") as bar_file:
+            original_content = bar_file.read()
+
+        # Update the bar.jac file with new behavior
+        with open(bar_file_path, "r+") as bar_file:
+            content = bar_file.read()
+            last_brace_index = content.rfind("}")
+            if last_brace_index != -1:
+                updated_content = content[:last_brace_index] + new_behavior
+                bar_file.seek(0)
+                bar_file.write(updated_content)
+                bar_file.truncate()
+
+        captured_output = io.StringIO()
+        sys.stdout = captured_output
+
+        try:
+            cli.enter(
+                filename=bar_file_path,
+                session=session,
+                entrypoint="bar_walk",
+                args=[],
+            )
+            sys.stdout = sys.__stdout__
+            stdout_value = captured_output.getvalue()
+            expected_output = "bar_walk has been updated with new behavior!"
+            self.assertIn(expected_output, stdout_value.split("\n"))
+        finally:
+            # Restore the original content of bar.jac
+            with open(bar_file_path, "w") as bar_file:
+
+                bar_file.write(original_content)