Update E2E test for linear ranker

Author: willtai

src/neo4j_graphrag/types.py

@@ -176,7 +176,7 @@ def validate_alpha(self) -> Self:
         if ranker == HybridSearchRanker.LINEAR:
             if alpha is None:
                 raise ValueError("alpha must be provided when using the linear ranker")
-            if 0.0 <= alpha <= 1.0:
+            if not (0.0 <= alpha <= 1.0):
                 raise ValueError("alpha must be between 0 and 1")
         else:
             if alpha is not None:

tests/e2e/test_hybrid_e2e.py

@@ -192,6 +192,8 @@ def test_hybrid_retriever_search_text_linear_ranker(
         query_text="Find me a book about Fremen",
         top_k=top_k,
         effective_search_ratio=effective_search_ratio,
+        ranker="linear",
+        alpha=0.9,
     )
 
     assert isinstance(results, RetrieverResult)