Harrison/prediction guard (#3490)

Co-authored-by: Daniel Whitenack <whitenack.daniel@gmail.com>

tests/integration_tests/llms/test_predictionguard.py

@@ -0,0 +1,10 @@
+"""Test Prediction Guard API wrapper."""
+
+from langchain.llms.predictionguard import PredictionGuard
+
+
+def test_predictionguard_call() -> None:
+    """Test valid call to prediction guard."""
+    llm = PredictionGuard(name="default-text-gen")
+    output = llm("Say foo:")
+    assert isinstance(output, str)