test: add test for YouTubeTrendingComponent component

src/backend/tests/unit/components/youtube/test_trending_component.py

@@ -0,0 +1,63 @@
+import pytest
+from langflow.components.youtube import YouTubeTrendingComponent
+from tests.base import ComponentTestBaseWithClient
+
+
+@pytest.mark.usefixtures("client")
+class TestYouTubeTrendingComponent(ComponentTestBaseWithClient):
+    @pytest.fixture
+    def component_class(self):
+        return YouTubeTrendingComponent
+
+    @pytest.fixture
+    def default_kwargs(self):
+        return {
+            "api_key": "YOUR_API_KEY",
+            "region": "Global",
+            "category": "All",
+            "max_results": 10,
+            "include_statistics": True,
+            "include_content_details": True,
+            "include_thumbnails": True,
+        }
+
+    @pytest.fixture
+    def file_names_mapping(self):
+        return [
+            {"version": "1.0.0", "module": "youtube_trending", "file_name": "YouTubeTrending"},
+        ]
+
+    async def test_get_trending_videos(self, component_class, default_kwargs):
+        # Arrange
+        component = component_class(**default_kwargs)
+
+        # Act
+        result = await component.get_trending_videos()
+
+        # Assert
+        assert isinstance(result, pd.DataFrame), "Result should be a DataFrame."
+        assert not result.empty, "Result DataFrame should not be empty."
+
+    async def test_invalid_max_results(self, component_class, default_kwargs):
+        # Arrange
+        default_kwargs["max_results"] = 100  # Exceeding max limit
+        component = component_class(**default_kwargs)
+
+        # Act
+        result = await component.get_trending_videos()
+
+        # Assert
+        assert isinstance(result, pd.DataFrame), "Result should be a DataFrame."
+        assert result.empty or result.shape[0] <= 50, "Result should not exceed 50 entries."
+
+    async def test_api_key_required(self, component_class):
+        # Arrange
+        component = component_class(api_key="", region="Global", category="All", max_results=10)
+
+        # Act
+        result = await component.get_trending_videos()
+
+        # Assert
+        assert isinstance(result, pd.DataFrame), "Result should be a DataFrame."
+        assert "error" in result.columns, "Result should contain an error column."
+        assert not result.empty, "Error DataFrame should not be empty."