Harrison/multiline commands (#2280)

Co-authored-by: Marc Päpper <mpaepper@users.noreply.github.com>

tests/unit_tests/test_python.py

@@ -1,6 +1,15 @@
 """Test functionality of Python REPL."""
 
 from langchain.python import PythonREPL
+from langchain.tools.python.tool import PythonREPLTool
+
+_SAMPLE_CODE = """
+```
+def multiply():
+    print(5*6)
+multiply()
+```
+"""
 
 
 def test_python_repl() -> None:
@@ -43,6 +52,14 @@ def test_functionality() -> None:
     assert output == "2\n"
 
 
+def test_functionality_multiline() -> None:
+    """Test correct functionality for ChatGPT multiline commands."""
+    chain = PythonREPL()
+    tool = PythonREPLTool(python_repl=chain)
+    output = tool.run(_SAMPLE_CODE)
+    assert output == "30\n"
+
+
 def test_function() -> None:
     """Test correct functionality."""
     chain = PythonREPL()