fix: add --comment param for import-versions command

tests/importing/test_versions.py

@@ -14,17 +14,40 @@ class TestFromWuttaToVersions(VersionTestCase):
     def make_handler(self, **kwargs):
         return mod.FromWuttaToVersions(self.config, **kwargs)
 
+    def test_consume_kwargs(self):
+
+        # no comment by default
+        handler = self.make_handler()
+        kw = handler.consume_kwargs({})
+        self.assertEqual(kw, {})
+        self.assertIsNone(handler.continuum_comment)
+
+        # but can provide one
+        handler = self.make_handler()
+        kw = handler.consume_kwargs({"comment": "yeehaw"})
+        self.assertEqual(kw, {})
+        self.assertEqual(handler.continuum_comment, "yeehaw")
+
     def test_begin_target_transaction(self):
         model = self.app.model
         txncls = continuum.transaction_class(model.User)
 
+        # basic / defaults
         handler = self.make_handler()
         self.assertIsNone(handler.continuum_uow)
         self.assertIsNone(handler.continuum_txn)
-
         handler.begin_target_transaction()
         self.assertIsInstance(handler.continuum_uow, continuum.UnitOfWork)
         self.assertIsInstance(handler.continuum_txn, txncls)
+        # nb. no comment
+        self.assertIsNone(handler.continuum_txn.meta.get("comment"))
+
+        # with comment
+        handler = self.make_handler()
+        handler.continuum_comment = "yeehaw"
+        handler.begin_target_transaction()
+        self.assertIn("comment", handler.continuum_txn.meta)
+        self.assertEqual(handler.continuum_txn.meta["comment"], "yeehaw")
 
     def test_get_importer_kwargs(self):
         handler = self.make_handler()
@@ -57,14 +80,6 @@ class TestFromWuttaToVersions(VersionTestCase):
         self.assertNotIn("Upgrade", importers)
 
 
-class UserImporter(mod.FromWuttaToVersionBase):
-
-    @property
-    def model_class(self):
-        model = self.app.model
-        return model.User
-
-
 class TestFromWuttaToVersionBase(VersionTestCase):
 
     def make_importer(self, model_class=None, **kwargs):