test: add ConnectorDocument unit tests and factory fixture

surfsense_backend/app/indexing_pipeline/connector_document.py

@@ -0,0 +1,23 @@
+from pydantic import BaseModel, field_validator
+
+from app.db import DocumentType
+
+
+class ConnectorDocument(BaseModel):
+    title: str
+    source_markdown: str
+    unique_id: str
+    document_type: DocumentType
+    search_space_id: int
+    should_summarize: bool = True
+    should_use_code_chunker: bool = False
+    metadata: dict = {}
+    connector_id: int | None = None
+    created_by_id: str | None = None
+
+    @field_validator("title", "source_markdown", "unique_id")
+    @classmethod
+    def not_empty(cls, v: str, info) -> str:
+        if not v.strip():
+            raise ValueError(f"{info.field_name} must not be empty or whitespace")
+        return v