test: Add coverage improvement test for tests/test_generate_answer_node.py

tests/test_generate_answer_node.py

@@ -0,0 +1,270 @@
+import json
+import pytest
+from langchain.prompts import (
+    PromptTemplate,
+)
+from langchain_community.chat_models import (
+    ChatOllama,
+)
+from langchain_core.runnables import (
+    RunnableParallel,
+)
+from requests.exceptions import (
+    Timeout,
+)
+from scrapegraphai.nodes.generate_answer_node import (
+    GenerateAnswerNode,
+)
+
+
+class DummyLLM:
+
+    def __call__(self, *args, **kwargs):
+        return "dummy response"
+
+
+class DummyLogger:
+
+    def info(self, msg):
+        pass
+
+    def error(self, msg):
+        pass
+
+
+@pytest.fixture
+def dummy_node():
+    """
+    Fixture for a GenerateAnswerNode instance using DummyLLM.
+    Uses a valid input keys string ("dummy_input & doc") to avoid parsing errors.
+    """
+    node_config = {"llm_model": DummyLLM(), "verbose": False, "timeout": 1}
+    node = GenerateAnswerNode("dummy_input & doc", ["output"], node_config=node_config)
+    node.logger = DummyLogger()
+    node.get_input_keys = lambda state: ["dummy_input", "doc"]
+    return node
+
+
+def test_process_missing_content_and_user_prompt(dummy_node):
+    """
+    Test that process() raises a ValueError when either the content or the user prompt is missing.
+    """
+    state_missing_content = {"user_prompt": "What is the answer?"}
+    with pytest.raises(ValueError) as excinfo1:
+        dummy_node.process(state_missing_content)
+    assert "No content found in state" in str(excinfo1.value)
+    state_missing_prompt = {"content": "Some valid context content"}
+    with pytest.raises(ValueError) as excinfo2:
+        dummy_node.process(state_missing_prompt)
+    assert "No user prompt found in state" in str(excinfo2.value)
+
+
+class DummyLLMWithPipe:
+    """DummyLLM that supports the pipe '|' operator.
+    When used in a chain with a PromptTemplate, the pipe operator returns self,
+    simulating chain composition."""
+
+    def __or__(self, other):
+        return self
+
+    def __call__(self, *args, **kwargs):
+        return {"content": "script single-chunk answer"}
+
+
+@pytest.fixture
+def dummy_node_with_pipe():
+    """
+    Fixture for a GenerateAnswerNode instance using DummyLLMWithPipe.
+    Uses a valid input keys string ("dummy_input & doc") to avoid parsing errors.
+    """
+    node_config = {"llm_model": DummyLLMWithPipe(), "verbose": False, "timeout": 480}
+    node = GenerateAnswerNode("dummy_input & doc", ["output"], node_config=node_config)
+    node.logger = DummyLogger()
+    node.get_input_keys = lambda state: ["dummy_input", "doc"]
+    return node
+
+
+def test_execute_multiple_chunks(dummy_node_with_pipe):
+    """
+    Test the execute() method for a scenario with multiple document chunks.
+    It simulates parallel processing of chunks and then merges them.
+    """
+    state = {
+        "dummy_input": "What is the final answer?",
+        "doc": ["Chunk text 1", "Chunk text 2"],
+    }
+
+    def fake_invoke_with_timeout(chain, inputs, timeout):
+        if isinstance(chain, RunnableParallel):
+            return {
+                "chunk1": {"content": "answer for chunk 1"},
+                "chunk2": {"content": "answer for chunk 2"},
+            }
+        if "context" in inputs and "question" in inputs:
+            return {"content": "merged final answer"}
+        return {"content": "single answer"}
+
+    dummy_node_with_pipe.invoke_with_timeout = fake_invoke_with_timeout
+    output_state = dummy_node_with_pipe.execute(state)
+    assert output_state["output"] == {"content": "merged final answer"}
+
+
+def test_execute_single_chunk(dummy_node_with_pipe):
+    """
+    Test the execute() method for a single document chunk.
+    """
+    state = {"dummy_input": "What is the answer?", "doc": ["Only one chunk text"]}
+
+    def fake_invoke_with_timeout(chain, inputs, timeout):
+        if "question" in inputs:
+            return {"content": "single-chunk answer"}
+        return {"content": "unexpected result"}
+
+    dummy_node_with_pipe.invoke_with_timeout = fake_invoke_with_timeout
+    output_state = dummy_node_with_pipe.execute(state)
+    assert output_state["output"] == {"content": "single-chunk answer"}
+
+
+def test_execute_merge_json_decode_error(dummy_node_with_pipe):
+    """
+    Test that execute() handles a JSONDecodeError in the merge chain properly.
+    """
+    state = {
+        "dummy_input": "What is the final answer?",
+        "doc": ["Chunk 1 text", "Chunk 2 text"],
+    }
+
+    def fake_invoke_with_timeout(chain, inputs, timeout):
+        if isinstance(chain, RunnableParallel):
+            return {
+                "chunk1": {"content": "answer for chunk 1"},
+                "chunk2": {"content": "answer for chunk 2"},
+            }
+        if "context" in inputs and "question" in inputs:
+            raise json.JSONDecodeError("Invalid JSON", "", 0)
+        return {"content": "unexpected response"}
+
+    dummy_node_with_pipe.invoke_with_timeout = fake_invoke_with_timeout
+    output_state = dummy_node_with_pipe.execute(state)
+    assert "error" in output_state["output"]
+    assert (
+        "Invalid JSON response format during merge" in output_state["output"]["error"]
+    )
+
+
+class DummyChain:
+    """A dummy chain for simulating a chain's invoke behavior.
+    Returns a successful answer in the expected format."""
+
+    def invoke(self, inputs):
+        return {"content": "successful answer"}
+
+
+@pytest.fixture
+def dummy_node_for_process():
+    """
+    Fixture for creating a GenerateAnswerNode instance for testing the process() method success case.
+    """
+    node_config = {"llm_model": DummyChain(), "verbose": False, "timeout": 1}
+    node = GenerateAnswerNode(
+        "user_prompt & content", ["output"], node_config=node_config
+    )
+    node.logger = DummyLogger()
+    node.get_input_keys = lambda state: ["user_prompt", "content"]
+    return node
+
+
+def test_process_success(dummy_node_for_process):
+    """
+    Test that process() successfully generates an answer when both user prompt and content are provided.
+    """
+    state = {
+        "user_prompt": "What is the answer?",
+        "content": "This is some valid context.",
+    }
+    dummy_node_for_process.chain = DummyChain()
+    dummy_node_for_process.invoke_with_timeout = (
+        lambda chain, inputs, timeout: chain.invoke(inputs)
+    )
+    new_state = dummy_node_for_process.process(state)
+    assert new_state["output"] == {"content": "successful answer"}
+
+
+def test_execute_timeout_single_chunk(dummy_node_with_pipe):
+    """
+    Test that execute() properly handles a Timeout exception in the single chunk branch.
+    """
+    state = {"dummy_input": "What is the answer?", "doc": ["Only one chunk text"]}
+
+    def fake_invoke_timeout(chain, inputs, timeout):
+        raise Timeout("Simulated timeout error")
+
+    dummy_node_with_pipe.invoke_with_timeout = fake_invoke_timeout
+    output_state = dummy_node_with_pipe.execute(state)
+    assert "error" in output_state["output"]
+    assert "Response timeout exceeded" in output_state["output"]["error"]
+    assert "Simulated timeout error" in output_state["output"]["raw_response"]
+
+
+def test_execute_script_creator_single_chunk():
+    """
+    Test the execute() method for the scenario when script_creator mode is enabled.
+    This verifies that the non-markdown prompt templates branch is executed and the expected answer is generated.
+    """
+    node_config = {
+        "llm_model": DummyLLMWithPipe(),
+        "verbose": False,
+        "timeout": 480,
+        "script_creator": True,
+        "force": False,
+        "is_md_scraper": False,
+        "additional_info": "TEST INFO: ",
+    }
+    node = GenerateAnswerNode("dummy_input & doc", ["output"], node_config=node_config)
+    node.logger = DummyLogger()
+    node.get_input_keys = lambda state: ["dummy_input", "doc"]
+    state = {
+        "dummy_input": "What is the script answer?",
+        "doc": ["Only one chunk script"],
+    }
+
+    def fake_invoke_with_timeout(chain, inputs, timeout):
+        if "question" in inputs:
+            return {"content": "script single-chunk answer"}
+        return {"content": "unexpected response"}
+
+    node.invoke_with_timeout = fake_invoke_with_timeout
+    output_state = node.execute(state)
+    assert output_state["output"] == {"content": "script single-chunk answer"}
+
+
+class DummyChatOllama(ChatOllama):
+    """A dummy ChatOllama class to simulate ChatOllama behavior."""
+
+
+class DummySchema:
+    """A dummy schema class with a model_json_schema method."""
+
+    def model_json_schema(self):
+        return "dummy_schema_json"
+
+
+def test_init_chat_ollama_format():
+    """
+    Test that the __init__ method of GenerateAnswerNode sets the format attribute of a ChatOllama LLM correctly.
+    """
+    dummy_llm = DummyChatOllama()
+    node_config = {"llm_model": dummy_llm, "verbose": False, "timeout": 1}
+    node = GenerateAnswerNode("dummy_input", ["output"], node_config=node_config)
+    assert node.llm_model.format == "json"
+    dummy_llm_with_schema = DummyChatOllama()
+    node_config_with_schema = {
+        "llm_model": dummy_llm_with_schema,
+        "verbose": False,
+        "timeout": 1,
+        "schema": DummySchema(),
+    }
+    node2 = GenerateAnswerNode(
+        "dummy_input", ["output"], node_config=node_config_with_schema
+    )
+    assert node2.llm_model.format == "dummy_schema_json"