Ensure that .up and .down work as well.

activerecord/test/cases/invertible_migration_test.rb

@@ -54,13 +54,13 @@ def test_no_reverse
       end
     end
 
-    def test_up
+    def test_migrate_up
       migration = InvertibleMigration.new
       migration.migrate(:up)
       assert migration.connection.table_exists?("horses"), "horses should exist"
     end
 
-    def test_down
+    def test_migrate_down
       migration = InvertibleMigration.new
       migration.migrate :up
       migration.migrate :down
@@ -77,5 +77,16 @@ def test_legacy_down
       LegacyMigration.migrate :down
       assert !ActiveRecord::Base.connection.table_exists?("horses"), "horses should not exist"
     end
+
+    def test_up
+      LegacyMigration.up
+      assert ActiveRecord::Base.connection.table_exists?("horses"), "horses should exist"
+    end
+
+    def test_down
+      LegacyMigration.up
+      LegacyMigration.down
+      assert !ActiveRecord::Base.connection.table_exists?("horses"), "horses should not exist"
+    end
   end
 end