Harrison/update docstore (#47)

change docstore interface

tests/integration_tests/chains/test_react.py

@@ -1,13 +1,18 @@
 """Integration test for self ask with search."""
 
 from langchain.chains.react.base import ReActChain
+from langchain.docstore.wikipedia import Wikipedia
 from langchain.llms.openai import OpenAI
 
 
 def test_react() -> None:
     """Test functionality on a prompt."""
     llm = OpenAI(temperature=0)
-    react = ReActChain(llm=llm)
-    question = "Were Scott Derrickson and Ed Wood of the same nationality?"
+    react = ReActChain(llm=llm, docstore=Wikipedia())
+    question = (
+        "Author David Chanoff has collaborated with a U.S. Navy admiral "
+        "who served as the ambassador to the United Kingdom under "
+        "which President?"
+    )
     output = react.run(question)
-    assert output == "yes"
+    assert output == "Bill Clinton"