test: Update coverage improvement test for tests/test_json_scraper_graph.py

tests/test_json_scraper_graph.py

@@ -95,4 +95,42 @@ class TestJSONScraperGraph:
             mock_execute.assert_called_once_with({"user_prompt": "Analyze the data from the JSON file", "json": "path/to/single/file.json"})
             mock_fetch_node.assert_called_once()
             mock_generate_answer_node.assert_called_once()
+            mock_create_llm.assert_called_once_with({"model": "test-model", "temperature": 0})
+
+    @patch('scrapegraphai.graphs.json_scraper_graph.FetchNode')
+    @patch('scrapegraphai.graphs.json_scraper_graph.GenerateAnswerNode')
+    @patch.object(JSONScraperGraph, '_create_llm')
+    def test_json_scraper_graph_no_answer_found(self, mock_create_llm, mock_generate_answer_node, mock_fetch_node, mock_llm_model, mock_embedder_model):
+        """
+        Test JSONScraperGraph when no answer is found.
+        This test checks if the graph correctly handles the scenario where no answer is generated,
+        ensuring it returns the default "No answer found." message.
+        """
+        # Mock the _create_llm method to return a mock LLM model
+        mock_create_llm.return_value = mock_llm_model
+
+        # Mock the execute method of BaseGraph to return an empty answer
+        with patch('scrapegraphai.graphs.json_scraper_graph.BaseGraph.execute') as mock_execute:
+            mock_execute.return_value = ({}, {})  # Empty state and execution info
+
+            # Create a JSONScraperGraph instance
+            graph = JSONScraperGraph(
+                prompt="Query that produces no answer",
+                source="path/to/empty/file.json",
+                config={"llm": {"model": "test-model", "temperature": 0}},
+                schema=BaseModel
+            )
+
+            # Set mocked embedder model
+            graph.embedder_model = mock_embedder_model
+
+            # Run the graph
+            result = graph.run()
+
+            # Assertions
+            assert result == "No answer found."
+            assert graph.input_key == "json"
+            mock_execute.assert_called_once_with({"user_prompt": "Query that produces no answer", "json": "path/to/empty/file.json"})
+            mock_fetch_node.assert_called_once()
+            mock_generate_answer_node.assert_called_once()
             mock_create_llm.assert_called_once_with({"model": "test-model", "temperature": 0})