fix: Prevent Mock object issues in graph memory tests (#3627)

Co-authored-by: parshvadaftari <daftariparshva@gmail.com>

tests/memory/test_kuzu.py

@@ -7,11 +7,25 @@ from mem0.memory.kuzu_memory import MemoryGraph
 class TestKuzu:
     """Test that Kuzu memory works correctly"""
 
+    # Create distinct embeddings that won't match with threshold=0.7
+    # Each embedding is mostly zeros with ones in different positions to ensure low similarity
+    alice_emb = np.zeros(384)
+    alice_emb[0:96] = 1.0
+
+    bob_emb = np.zeros(384)
+    bob_emb[96:192] = 1.0
+
+    charlie_emb = np.zeros(384)
+    charlie_emb[192:288] = 1.0
+
+    dave_emb = np.zeros(384)
+    dave_emb[288:384] = 1.0
+
     embeddings = {
-        "alice": np.random.uniform(0.0, 0.9, 384).tolist(),
-        "bob": np.random.uniform(0.0, 0.9, 384).tolist(),
-        "charlie": np.random.uniform(0.0, 0.9, 384).tolist(),
-        "dave": np.random.uniform(0.0, 0.9, 384).tolist(),
+        "alice": alice_emb.tolist(),
+        "bob": bob_emb.tolist(),
+        "charlie": charlie_emb.tolist(),
+        "dave": dave_emb.tolist(),
     }
 
     @pytest.fixture
@@ -26,6 +40,7 @@ class TestKuzu:
 
         # Mock graph store config
         config.graph_store.config.db = ":memory:"
+        config.graph_store.threshold = 0.7
 
         # Mock LLM config
         config.llm.provider = "mock_llm"