test(langchain): add test runner for ChatPromptTemplate save/load functionality

Author: Khagesh-Anayasmi

test.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Test runner for issue #32637: ChatPromptTemplate save/load functionality
+# Supports 'base' and 'new' modes for testing harness.
+#
+# Usage: ./test.sh [base|new]
+#   base - No-op mode (original code baseline)
+#   new  - Run tests for ChatPromptTemplate save/load implementation
+
+MODE="${1:-new}"
+
+case "$MODE" in
+  base)
+    # Base mode: no-op (tests would fail on original code without save() implementation)
+    echo "[base mode] Skipping tests on original code (save() not yet implemented)"
+    exit 0
+    ;;
+  new)
+    # New mode: run pytest on issue #32637 tests
+    echo "[new mode] Running ChatPromptTemplate save/load tests..."
+    cd "$(dirname "$0")"
+
+    # Run pytest on the specific test file with verbose output
+    python -m pytest \
+      libs/core/tests/unit_tests/prompts/test_chat.py::test_chat_prompt_template_save_json \
+      libs/core/tests/unit_tests/prompts/test_chat.py::test_chat_prompt_template_save_yaml \
+      libs/core/tests/unit_tests/prompts/test_chat.py::test_chat_prompt_template_load_json_roundtrip \
+      libs/core/tests/unit_tests/prompts/test_chat.py::test_chat_prompt_template_load_yaml_roundtrip \
+      libs/core/tests/unit_tests/prompts/test_chat.py::test_chat_prompt_template_save_unsupported_format \
+      libs/core/tests/unit_tests/prompts/test_chat.py::test_chat_prompt_template_save_invalid_path \
+      libs/core/tests/unit_tests/prompts/test_chat.py::test_chat_prompt_template_save_creates_parent_directories \
+      -v --tb=short 2>&1
+    ;;
+  *)
+    echo "Usage: $0 [base|new]"
+    echo ""
+    echo "Modes:"
+    echo "  base - No-op mode (original code baseline)"
+    echo "  new  - Run ChatPromptTemplate save/load tests"
+    exit 2
+    ;;
+esac