diff --git a/tests/unit/test_query/test_triples_cassandra_query.py b/tests/unit/test_query/test_triples_cassandra_query.py
index eb81c8c8..0b27458f 100644
--- a/tests/unit/test_query/test_triples_cassandra_query.py
+++ b/tests/unit/test_query/test_triples_cassandra_query.py
@@ -3,7 +3,7 @@ Tests for Cassandra triples query service
 """
 
 import pytest
-from unittest.mock import MagicMock
+from unittest.mock import MagicMock, patch
 
 from trustgraph.query.triples.cassandra.service import Processor
 from trustgraph.schema import Value
@@ -67,4 +67,51 @@ class TestCassandraQueryProcessor:
         
         assert isinstance(result, Value)
         assert result.value == "ftp://example.com/file"
-        assert result.is_uri is False
\ No newline at end of file
+        assert result.is_uri is False
+
+    @pytest.mark.asyncio
+    @patch('trustgraph.query.triples.cassandra.service.TrustGraph')
+    async def test_query_triples_spo_query(self, mock_trustgraph):
+        """Test querying triples with subject, predicate, and object specified"""
+        from trustgraph.schema import TriplesQueryRequest, Value
+        
+        # Setup mock TrustGraph
+        mock_tg_instance = MagicMock()
+        mock_trustgraph.return_value = mock_tg_instance
+        mock_tg_instance.get_spo.return_value = None  # SPO query returns None if found
+        
+        processor = Processor(
+            taskgroup=MagicMock(),
+            id='test-cassandra-query',
+            graph_host='localhost'
+        )
+        
+        # Create query request with all SPO values
+        query = TriplesQueryRequest(
+            user='test_user',
+            collection='test_collection',
+            s=Value(value='test_subject', is_uri=False),
+            p=Value(value='test_predicate', is_uri=False),
+            o=Value(value='test_object', is_uri=False),
+            limit=100
+        )
+        
+        result = await processor.query_triples(query)
+        
+        # Verify TrustGraph was created with correct parameters
+        mock_trustgraph.assert_called_once_with(
+            hosts=['localhost'],
+            keyspace='test_user',
+            table='test_collection'
+        )
+        
+        # Verify get_spo was called with correct parameters
+        mock_tg_instance.get_spo.assert_called_once_with(
+            'test_subject', 'test_predicate', 'test_object', limit=100
+        )
+        
+        # Verify result contains the queried triple
+        assert len(result) == 1
+        assert result[0].s.value == 'test_subject'
+        assert result[0].p.value == 'test_predicate'
+        assert result[0].o.value == 'test_object'
\ No newline at end of file