Verify exact-run CSV publication

tests/test_reporting_service.py

@@ -384,7 +384,7 @@ class ReportingServiceTests(unittest.TestCase):
             )
         self.assertTrue(raised.exception.execution_id)
 
-    def test_dataflow_dataset_can_pin_an_exact_published_run(self) -> None:
+    def test_dataflow_run_can_be_exported_as_formula_safe_csv(self) -> None:
         payload = dataset_payload()
         rows = list(payload.pop("static_rows"))
         payload.update(
@@ -410,7 +410,7 @@ class ReportingServiceTests(unittest.TestCase):
             report_id="report-1",
             report_revision=1,
             parameters={},
-            query=None,
+            query=ReportQuery(mode="detail", dimensions=["note"]),
             idempotency_key="published-dataflow-run",
         )
 
@@ -421,6 +421,15 @@ class ReportingServiceTests(unittest.TestCase):
             provider.last_request.run_ref,
         )
         self.assertTrue(result["provenance"]["source"]["immutable_run"])
+        content, content_type, filename = export_execution(
+            self.session,
+            self.principal,
+            execution_id=str(result["execution_id"]),
+            format="csv",
+        )
+        self.assertEqual("text/csv; charset=utf-8", content_type)
+        self.assertTrue(filename.endswith(".csv"))
+        self.assertIn("'=cmd", content.decode("utf-8-sig"))
 
     def test_restricted_access_and_service_scope_guards(self) -> None:
         self._create_report_graph(