Harrison/wolfram alpha (#579)

Co-authored-by: Nicolas <nicolascamara29@gmail.com>

tests/integration_tests/test_wolfram_alpha_api.py

@@ -0,0 +1,9 @@
+"""Integration test for Wolfram Alpha API Wrapper."""
+from langchain.utilities.wolfram_alpha import WolframAlphaAPIWrapper
+
+
+def test_call() -> None:
+    """Test that call gives the correct answer."""
+    search = WolframAlphaAPIWrapper()
+    output = search.run("what is 2x+18=x+5?")
+    assert "x = -13" in output