added test for host_organization migration

tests/helpers.py

@@ -48,5 +48,6 @@ def __ne__(self, other: object) -> bool:
         return True
 
 
-assert Missing() != Missing()
+# ridiculous formatting because `ruff` won't allow `not (x == y)`
+assert (Missing() == Missing()) ^ bool("x")
 assert Missing() != Missing()

tests/migrations/revision_5410668e15ad.py

@@ -0,0 +1,23 @@
+from hushline.db import db
+
+
+class UpgradeTester:
+    def load_data(self) -> None:
+        pass  # migration loads data itself
+
+    def check_upgrade(self) -> None:
+        rows = list(db.session.execute(db.text("SELECT * FROM host_organization")))
+        assert len(rows) == 1
+
+        row = rows[0]._asdict()
+        assert row["id"] == 1
+
+
+class DowngradeTester:
+    """Nothing to do. It's just a table drop."""
+
+    def load_data(self) -> None:
+        pass
+
+    def check_downgrade(self) -> None:
+        pass