refactor: Refactor Wikipedia API component (#5432)

* refactor(wikipedia): Refactor Wikipedia API component

* test: add unit tests for WikipediaAPIComponent

* [autofix.ci] apply automated fixes

* refactor: improve WikipediaAPIComponent tests and fix lint issues

* [autofix.ci] apply automated fixes

* fix: resolve lint issues in WikipediaAPIComponent tests

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Edwin Jose <edwin.jose@datastax.com>

src/backend/tests/unit/components/tools/test_wikipedia_api.py

@@ -0,0 +1,85 @@
+from unittest.mock import MagicMock
+
+import pytest
+from langflow.components.tools import WikipediaAPIComponent
+from langflow.custom import Component
+from langflow.custom.utils import build_custom_component_template
+from langflow.schema import Data
+from langflow.schema.message import Message
+
+
+def test_wikipedia_initialization():
+    component = WikipediaAPIComponent()
+    assert component.display_name == "Wikipedia API"
+    assert component.description == "Call Wikipedia API."
+    assert component.icon == "Wikipedia"
+
+
+def test_wikipedia_template():
+    wikipedia = WikipediaAPIComponent()
+    component = Component(_code=wikipedia._code)
+    frontend_node, _ = build_custom_component_template(component)
+
+    # Verify basic structure
+    assert isinstance(frontend_node, dict)
+
+    # Verify inputs
+    assert "template" in frontend_node
+    input_names = [input_["name"] for input_ in frontend_node["template"].values() if isinstance(input_, dict)]
+
+    expected_inputs = ["input_value", "lang", "k", "load_all_available_meta", "doc_content_chars_max"]
+
+    for input_name in expected_inputs:
+        assert input_name in input_names
+
+
+@pytest.fixture
+def mock_wikipedia_wrapper(mocker):
+    return mocker.patch("langchain_community.utilities.wikipedia.WikipediaAPIWrapper")
+
+
+def test_fetch_content(mock_wikipedia_wrapper):
+    component = WikipediaAPIComponent()
+    component.input_value = "test query"
+    component.k = 3
+    component.lang = "en"
+
+    # Mock the WikipediaAPIWrapper and its load method
+    mock_instance = MagicMock()
+    mock_wikipedia_wrapper.return_value = mock_instance
+    mock_doc = MagicMock()
+    mock_doc.page_content = "Test content"
+    mock_doc.metadata = {"source": "wikipedia", "title": "Test Page"}
+    mock_instance.load.return_value = [mock_doc]
+
+    # Mock the _build_wrapper method to return our mock instance
+    component._build_wrapper = MagicMock(return_value=mock_instance)
+
+    result = component.fetch_content()
+
+    # Verify wrapper was built with correct params
+    component._build_wrapper.assert_called_once()
+    mock_instance.load.assert_called_once_with("test query")
+    assert isinstance(result, list)
+    assert len(result) == 1
+    assert result[0].text == "Test content"
+
+
+def test_fetch_content_text():
+    component = WikipediaAPIComponent()
+    component.fetch_content = MagicMock(return_value=[Data(text="First result"), Data(text="Second result")])
+
+    result = component.fetch_content_text()
+
+    assert isinstance(result, Message)
+    assert result.text == "First result\nSecond result\n"
+
+
+def test_wikipedia_error_handling():
+    component = WikipediaAPIComponent()
+
+    # Mock _build_wrapper to raise exception
+    component._build_wrapper = MagicMock(side_effect=Exception("API Error"))
+
+    with pytest.raises(Exception, match="API Error"):
+        component.fetch_content()