From 8a3a9c89687cfc337b97c24919e6cf029362f380 Mon Sep 17 00:00:00 2001
From: Bagatur <22008038+baskaryan@users.noreply.github.com>
Date: Thu, 5 Sep 2024 20:49:05 -0400
Subject: [PATCH] core[patch]: concrete prompt value test (#26128)

---
 .../tests/unit_tests/test_prompt_values.py    | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 libs/core/tests/unit_tests/test_prompt_values.py

diff --git a/libs/core/tests/unit_tests/test_prompt_values.py b/libs/core/tests/unit_tests/test_prompt_values.py
new file mode 100644
index 00000000000..625cd51202b
--- /dev/null
+++ b/libs/core/tests/unit_tests/test_prompt_values.py
@@ -0,0 +1,28 @@
+import pytest
+
+from langchain_core.messages import (
+    AIMessage,
+    AIMessageChunk,
+    HumanMessage,
+    HumanMessageChunk,
+    SystemMessage,
+    SystemMessageChunk,
+    ToolMessage,
+    ToolMessageChunk,
+)
+from langchain_core.prompt_values import ChatPromptValueConcrete
+
+
+@pytest.mark.xfail(reason="Broken union type.")
+def test_chat_prompt_value_concrete() -> None:
+    messages: list = [
+        AIMessage("foo"),
+        HumanMessage("foo"),
+        SystemMessage("foo"),
+        ToolMessage("foo", tool_call_id="foo"),
+        AIMessageChunk(content="foo"),
+        HumanMessageChunk(content="foo"),
+        SystemMessageChunk(content="foo"),
+        ToolMessageChunk(content="foo", tool_call_id="foo"),
+    ]
+    assert ChatPromptValueConcrete(messages=messages).messages == messages