feat: add rss component (#8134)

* add RSS component

* add tests

* [autofix.ci] apply automated fixes

* Update rss.py

---------

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

src/backend/tests/unit/components/data/test_rss.py

@@ -0,0 +1,129 @@
+from unittest.mock import Mock, patch
+
+import pytest
+import requests
+from langflow.components.data.rss import RSSReaderComponent
+from langflow.schema import DataFrame
+
+from tests.base import ComponentTestBaseWithoutClient
+
+
+class TestRSSReaderComponent(ComponentTestBaseWithoutClient):
+    @pytest.fixture
+    def component_class(self):
+        """Return the component class to test."""
+        return RSSReaderComponent
+
+    @pytest.fixture
+    def default_kwargs(self):
+        """Return the default kwargs for the component."""
+        return {
+            "rss_url": "https://example.com/feed.xml",
+        }
+
+    @pytest.fixture
+    def file_names_mapping(self):
+        """Return an empty list since this component doesn't have version-specific files."""
+        return []
+
+    def test_successful_rss_fetch(self):
+        # Mock RSS feed content
+        mock_rss_content = """
+        <?xml version="1.0" encoding="UTF-8"?>
+        <rss version="2.0">
+            <channel>
+                <item>
+                    <title>Test Article 1</title>
+                    <link>https://example.com/1</link>
+                    <pubDate>2024-03-20</pubDate>
+                    <description>Test summary 1</description>
+                </item>
+                <item>
+                    <title>Test Article 2</title>
+                    <link>https://example.com/2</link>
+                    <pubDate>2024-03-21</pubDate>
+                    <description>Test summary 2</description>
+                </item>
+            </channel>
+        </rss>
+        """
+
+        # Mock the requests.get response
+        mock_response = Mock()
+        mock_response.content = mock_rss_content.encode("utf-8")
+        mock_response.raise_for_status = Mock()
+
+        with patch("requests.get", return_value=mock_response):
+            component = RSSReaderComponent(rss_url="https://example.com/feed.xml")
+            result = component.read_rss()
+
+            assert isinstance(result, DataFrame)
+            assert len(result) == 2
+            assert list(result.columns) == ["title", "link", "published", "summary"]
+            assert result.iloc[0]["title"] == "Test Article 1"
+            assert result.iloc[1]["title"] == "Test Article 2"
+
+    def test_rss_fetch_with_missing_fields(self):
+        # Mock RSS feed content with missing fields
+        mock_rss_content = """
+        <?xml version="1.0" encoding="UTF-8"?>
+        <rss version="2.0">
+            <channel>
+                <item>
+                    <title>Test Article</title>
+                    <!-- Missing link -->
+                    <pubDate>2024-03-20</pubDate>
+                    <!-- Missing description -->
+                </item>
+            </channel>
+        </rss>
+        """
+
+        mock_response = Mock()
+        mock_response.content = mock_rss_content.encode("utf-8")
+        mock_response.raise_for_status = Mock()
+
+        with patch("requests.get", return_value=mock_response):
+            component = RSSReaderComponent(rss_url="https://example.com/feed.xml")
+            result = component.read_rss()
+
+            assert isinstance(result, DataFrame)
+            assert len(result) == 1
+            assert result.iloc[0]["title"] == "Test Article"
+            assert result.iloc[0]["link"] == ""
+            assert result.iloc[0]["summary"] == ""
+
+    def test_rss_fetch_error(self):
+        # Mock a failed request
+        with patch("requests.get", side_effect=requests.RequestException("Network error")):
+            component = RSSReaderComponent(rss_url="https://example.com/feed.xml")
+            result = component.read_rss()
+
+            assert isinstance(result, DataFrame)
+            assert len(result) == 1
+            assert result.iloc[0]["title"] == "Error"
+            assert result.iloc[0]["link"] == ""
+            assert result.iloc[0]["published"] == ""
+            assert "Network error" in result.iloc[0]["summary"]
+
+    def test_empty_rss_feed(self):
+        # Mock empty RSS feed
+        mock_rss_content = """
+        <?xml version="1.0" encoding="UTF-8"?>
+        <rss version="2.0">
+            <channel>
+            </channel>
+        </rss>
+        """
+
+        mock_response = Mock()
+        mock_response.content = mock_rss_content.encode("utf-8")
+        mock_response.raise_for_status = Mock()
+
+        with patch("requests.get", return_value=mock_response):
+            component = RSSReaderComponent(rss_url="https://example.com/feed.xml")
+            result = component.read_rss()
+
+            assert isinstance(result, DataFrame)
+            assert len(result) == 0
+            assert list(result.columns) == ["title", "link", "published", "summary"]