Add assertions

Author: yahonda

activerecord/test/cases/adapters/postgresql/virtual_column_test.rb

@@ -49,6 +49,7 @@ def test_virtual_column
     def test_stored_column
       column = VirtualColumn.columns_hash["name_length"]
       assert_predicate column, :virtual?
+      assert_predicate column, :virtual_stored? if ActiveRecord::Base.lease_connection.database_version >= 18_000
       assert_equal 5, VirtualColumn.take.name_length
     end
 
@@ -59,6 +60,7 @@ def test_change_table
       VirtualColumn.reset_column_information
       column = VirtualColumn.columns_hash["lower_name"]
       assert_predicate column, :virtual?
+      assert_predicate column, :virtual_stored? if ActiveRecord::Base.lease_connection.database_version >= 18_000
       assert_equal "rails", VirtualColumn.take.lower_name
     end
 
@@ -70,6 +72,7 @@ def test_change_table_as_stored_false
         VirtualColumn.reset_column_information
         column = VirtualColumn.columns_hash["reversed_name"]
         assert_predicate column, :virtual?
+        assert_not_predicate column, :virtual_stored?
         assert_equal "sliaR", VirtualColumn.take.reversed_name
       end
 
@@ -80,6 +83,7 @@ def test_change_table_without_stored_option
         VirtualColumn.reset_column_information
         column = VirtualColumn.columns_hash["ascii_name"]
         assert_predicate column, :virtual?
+        assert_not_predicate column, :virtual_stored?
         assert_equal "82", VirtualColumn.take.ascii_name
       end